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文章速递Bi-Modal Failure Mechanism of Rolling Contact Bearings 认领
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作者 Y. Meged 《材料物理与化学进展(英文)》 2020年第10期230-238,共9页
The theory of failure of rolling contact bearings is based on fluctuating high level loading and material fatigue. This theory is unimodal, considering only the solid components of the bearing, and ignoring the liquid... The theory of failure of rolling contact bearings is based on fluctuating high level loading and material fatigue. This theory is unimodal, considering only the solid components of the bearing, and ignoring the liquid phase, which is the lubricant. Bearing life is rather dispersed, reaching a ratio of 20 between the extreme values. Since this theory was established, several exceptional phenomena were detected that could not be explained by it, such as: 1) Pitting damage beyond the contact path;2) Detrimental effect of a minute quantity of water in the lubricant on bearing life. 25 ppm of water in the lubricant brought about shorter bearing life by over than 30%. The bimodal failure theory considers both solid and liquid bearing components. The damaging process of the lubricant evolves from its cavitation. During this process vapor filled cavities are formed in low pressure zones. When these cavities reach high pressure zones they implode exothermally. These implosions cause local high pressure pulses reaching 30,000 at accompanied by a temperature rise of about 2000 degrees K [<a href="#ref1">1</a>]. This paper includes cavitation erosion test results on stainless steel samples by vibratory and water tunnel test rigs. Various methods of lubricant dehydration are presented and evaluated. The main conclusion from this analysis is the use of water-free lubricants, for long life of RC bearings and more uniform service life thereof. 展开更多
关键词 Cavitation Erosion Rolling Contact Bearings Stainless Steel Lubricant Dehydration Critical Erosion
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1-Hydroxyethylidene-1,1-diphosphonic Acid (HEDP) as a Corrosion Inhibitor of AISI 304 Stainless Steel in a Medium Containing Chloride and Sulfide Ions in the Presence of Different Metallic Cations 认领
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作者 Josimar Ribeiro 《化学工程与科学期刊(英文)》 2020年第3期225-257,共33页
The novelty of this paper is the analysis in a medium containing sulfide ion due to the generation of this ion in petroleum industries, in the refining stage (the sulfide ion is also present on the produced water). Th... The novelty of this paper is the analysis in a medium containing sulfide ion due to the generation of this ion in petroleum industries, in the refining stage (the sulfide ion is also present on the produced water). The performance of 1-hydroxyethylidene-1,1-diphosphonic acid inhibitor (HEDP) was investigated by potentiodynamic polarization, electrochemical impedance spectroscopy, and weight loss measurements in a dissolution of AISI 304 stainless steel immersed in a solution containing chloride and sulfide ions. The protection of the stainless was increased with the addition of divalent cations (Ca<sup>2+</sup>, Zn<sup>2+</sup>, and Mg<sup>2+</sup>). Potentiodynamic polarization studies have shown that the inhibitor alone has anodic protection, but the addition of Ca<sup>2+</sup> (10 mg<span style="font-family:Verdana, Helvetica, Arial;white-space:normal;background-color:#FFFFFF;">&#183</span>L<sup>-1</sup>) favors the cathodic protection, and the addition of Zn<sup>2+</sup> (20 mg<span style="font-family:Verdana, Helvetica, Arial;white-space:normal;background-color:#FFFFFF;">&#183</span>L<sup>-1</sup>) and Mg<sup>2+</sup> (10 mg<span style="font-family:Verdana, Helvetica, Arial;white-space:normal;background-color:#FFFFFF;">&#183</span>L<sup>-1</sup>) mixed-type is observed. Electrochemical impedance spectroscopy was performed at three distinct potentials: -0.3 [V <i>vs.</i> SCE], <i>E</i><sub>corr</sub> [V <i>vs.</i> SCE], and 0.1 [V <i>vs.</i> SCE]. This revealed that calcium is responsible for favoring the formation of the film and the other elements (zinc and magnesium) favor the stabilization of the protective film. Scanning electron microscopy analysis revealed that the addition of cations provided the adsorption of HEDP on the metal surface. Weight loss results showed that the presence of zinc in a solution containing HEDP favored greater inhibitor efficiency (Zn<sup>2+</sup> <i>η</i><sub>m</sub> = 85.2% and for Mg<sup>2+</sup> <i>η</i><sub>m</sub> = 70.4%). 展开更多
关键词 AISI 304 Stainless Steel HEDP Corrosion Inhibitor Chloride and Sulfide Ions Electrochemical Impedance Spectroscopy
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均布外压下球形封头屈曲特性研究 认领
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作者 王月阳 张建 唐文献 《船舶与海洋工程学报:英文版》 CSCD 2020年第1期96-100,共5页
This study aims to experimentally and numerically examine the buckling performances of stainless steel spherical caps under uniform external pressure.Three laboratory-scale caps were fabricated,measured,and tested.The... This study aims to experimentally and numerically examine the buckling performances of stainless steel spherical caps under uniform external pressure.Three laboratory-scale caps were fabricated,measured,and tested.The buckling behaviors of these caps were investigated through experiments and three numerical methods,namely,nonlinear Riks algorithm,nonlinear bifurcation,and linear elastic analysis.The buckling of equal-radius caps was numerically analyzed with different methods to identify their applicability under different wall thicknesses.The results obtained from the nonlinear Riks algorithm are in good agreement with the experimental results,which means the nonlinear Riks algorithm can accurately predict the buckling performances of spherical caps,including the magnitude of critical buckling loads and the deformation of post-buckling modes.The nonlinear bifurcation algorithm is only suitable for predicting the buckling loads of ultra-thin or large-span caps,and the linear buckling method is inappropriate for predicting the buckling of metal spherical caps. 展开更多
关键词 Spherical cap Stainless steel BUCKLING External pressure Bifurcation buckling Critical buckling
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Comparative study of mechanical, corrosion and erosion-corrosion properties of cast hyper-duplex and super-duplex stainless steels 认领
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作者 P.Nithin Raj P.K.Navaneethkrishnan +1 位作者 K.Sekar M.A.Joseph 《矿物冶金与材料学报:英文版》 SCIE EI CAS CSCD 2020年第7期954-961,共8页
Duplex stainless steels(DSSs)used in subsea structures and desalination industries require high corrosion and erosion resistance as well as excellent mechanical properties.The newly introduced cast duplex grade ASTM A... Duplex stainless steels(DSSs)used in subsea structures and desalination industries require high corrosion and erosion resistance as well as excellent mechanical properties.The newly introduced cast duplex grade ASTM A8907 A has a unique composition and is expected to have a much better resistance to corrosion and erosion compared with the super-duplex grades 5 A and 6 A.This work is a comparative study of the mechanical properties,corrosion,and erosion-corrosion resistance of super-duplex grades 5 A and 6 A and the hyper-duplex grade 7 A.The three DSSs exhibited equiaxial austenite islands in the ferrite matrix and balanced phase ratios.The hardness of the grade 7 A was nearly 15%higher than those of the super-duplex grades,which is attributed to the effect of the higher contents of W and Mn in 7 A.The impact toughness of grade 7 A was found to be lower than those of the super-duplex grades due to the carbide precipitation resulting from the partial substitution of Mo with W.The oxide layer strengthening effect of rare earth elements and the higher pitting resistance equivalent number(PREN)of grade7 A resulted in higher corrosion resistance.The harder and more passive grade 7 A showed a 35%lower material loss during erosion-corrosion. 展开更多
关键词 hyper-duplex stainless steels erosion−corrosion electrochemical corrosion marine environment super-duplex stainless steels
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Thermomechanical Behavior and Corrosion Resistance of a 316 L Austenitic Stainless Steel 认领
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作者 Rafael P. Ferreira Carmem C. F. Nascimento +2 位作者 Gedeon S. Reis Eden S. Silva Samuel F. Rodrigues 《材料科学与应用期刊(英文)》 2020年第4期217-233,共17页
Hot-formed components are constantly exposed to hostile environments with corrosive substances. Microstructural changes caused by thermomechanical processing can be predicted to increase the corrosion resistance of au... Hot-formed components are constantly exposed to hostile environments with corrosive substances. Microstructural changes caused by thermomechanical processing can be predicted to increase the corrosion resistance of austenitic stainless steels. The objective of this study is to understand the relationship between the dynamic softening mechanisms and corrosion resistance, thus optimizing the hot-forming process. In the current work, the dynamic recrystallization (DRX) behavior of AISI 316 L austenitic stainless steel was studied in the temperature range of 1273 - 1423 K and strain-rate range of 0.1 - 5.0 s-1 using physical simulation. Subsequently, potentiodynamic polarization tests and scanning electron microscopy were performed on the hot-deformed samples to investigate the influence of temperature and strain-rate on the corrosion resistance and mechanical properties. The results indicated that the DRX fractions increased under low-temperature and high strain-rate conditions, resulting in grain refinement. The potentiodynamic polarization tests indicated that the dynamically recovered samples demonstrated high resistance to corrosion compared with the DRX samples. The best route found for the investigated alloy was for the strain to be applied at a temperature of 1423 K and a strain rate of 0.1 s-1. 展开更多
关键词 316 L AUSTENITIC STAINLESS Steel SOFTENING PHENOMENA Corrosion
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Re-Assembly of Archaeological Massive Limestones Using Epoxy Resin Modified with Nanomaterials—Part 2: Applied 认领
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作者 Mohammad A. Aldoasri Sawsan S. Darwish +2 位作者 Mahmoud A. Adam Nagib A. Elmarzugi Sayed M. Ahmed 《绿色与可持续化学(英文)》 2020年第3期72-90,共19页
This part of study represents the applied study;which is a continuation of the experimental study that was carried out in part 1 [1]<span "="">. The experimental study in part 1 focused on ev... This part of study represents the applied study;which is a continuation of the experimental study that was carried out in part 1 [1]<span "="">. The experimental study in part 1 focused on evaluation of the effectiveness of Montmorillonite clay, calcium carbonate, and silicon dioxide nanoparticles for enhancing the performances of epoxy adhesives used in re-assembly of archaeological </span>massive limestones. Based on the obtained results in part 1, the choice fell on epoxy-clay nanocomposites as the best re-assembly adhesive material reinforced with Stainless Steel to conduct the applied study project. The current applied study that <span "="">represents a big project was carried out on 3 archaeological pharaonic massive limestones discovered separately in Ain Shams (Heliopolis) archaeological area in Egypt. The methodology included an accurate archaeological study, followed by analytical, and then the restoration and reassembly process. Firstly;in order to prove whether these artifacts are complementary to each other or not, then with a view to re-assembly and conserving these artifacts in the form of one stone block to be ready for museum display. Referred to the comprehensive archaeological and analytical study of the mentioned archeological stones, the results confirmed that, these stone pieces, in the original were one piece, therefore, it is possible to regrouping again to become one block complementary to each other, and this is what was done in this study. 展开更多
关键词 Epoxy-Clay Nanocomposites Re-Assembly Pharaonic Massive Stones Analytical Study Stainless Steel Bars
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文章速递Microstructure and Corrosion Resistance of Arc Additive Manufactured 316L Stainless Steel 认领
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作者 杨可 WANG Qiuyu +2 位作者 QU Yang JIANG Yongfeng BAO Yefeng 《武汉理工大学学报:材料科学英文版》 SCIE EI CAS 2020年第5期930-936,共7页
The gas tungsten arc welding based additive manufacturing (GTAW-AM) was carried out by printing 316L austenitic stainless steel on carbon steel substrate with different arc currents (140,160,180 A).Microstructure and ... The gas tungsten arc welding based additive manufacturing (GTAW-AM) was carried out by printing 316L austenitic stainless steel on carbon steel substrate with different arc currents (140,160,180 A).Microstructure and corrosion resistance of additive manufactured components were investigated.The results show that the microstructure of the GTAW-AM austenitic stainless steel is obviously changed by the arc current.With arc current increasing from 140 to 180 A,the austenite grains become coarse due to the effect of welding heat input.Meanwhile,the quantity of ferrites in the austenite matrix is decreased and the morphology transforms from lath to skeleton.Moreover,σ phases are finally formed under the arc currents of 180 A owing to high welding heat input.Therefore,as the microstructure transform into coarse-grained austenites,low-quantity ferrites and new-generated σ phases,the GTAW-AM austenitic stainless steel presents a significantly decrease in corrosion resistance.And the reduction of corrosion resistance is mainly due to the formation of σ phase as a result from consuming the large amounts of Cr element from the matrix. 展开更多
关键词 austenitic stainless steel additive manufacturing microstructure corrosion resistance
Influence of refining process and utilization of different slags on inclusions, titanium yield and total oxygen content of Ti-stabilized 321 stainless steel 认领
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作者 Xing-run Chen Guo-guang Cheng +2 位作者 Yu-yang Hou Jing-yu Li Ji-xiang Pan 《钢铁研究学报:英文版》 SCIE EI CAS CSCD 2020年第8期913-921,共9页
Ti-stabilized 321 stainless steel was prepared using an electric arc furnace, argon oxygen decarburization (AOD) furnace, ladle furnace (LF), and continuous casting processes. In addition, the effect of refining proce... Ti-stabilized 321 stainless steel was prepared using an electric arc furnace, argon oxygen decarburization (AOD) furnace, ladle furnace (LF), and continuous casting processes. In addition, the effect of refining process and utilization of different slags on the evolution of inclusions, titanium yield, and oxygen content was systematically investigated by experimental and thermodynamic analysis. The results reveal that the total oxygen content (TO) and inclusion density decreased during the refining process. The spherical CaO–SiO2–Al2O3–MgO inclusions existed in the 321 stainless steel after the AOD process. Moreover, prior to the Ti addition, the spherical CaO–Al2O3–MgO–SiO2 inclusions were observed during LF refining pro-cess. However, Ti addition resulted in multilayer CaO–Al2O3–MgO–TiOx inclusions. Two different samples were prepared by conventional CaO–Al2O3-based slag (Heat-1) and -TiO2-rich CaO–Al2O3-based slag (Heat-2). The statistical analysis revealed that the density of inclusions and the -TiOx content in CaO–Al2O3–MgO–TiOx inclusions found in Heat-2 sample are much lower than those in the Heat-1 sample. Furthermore, the TO content and Ti yield during the LF refining process were controlled by using -TiO2-rich calcium aluminate synthetic slag. These results were consistent with the ion–molecule coexist-ence theory and FactSage?7.2 software calculations. When -TiO2-rich CaO–Al2O3-based slag was used, the -TiO2 activity of the slag increased, and the equilibrium oxygen content significantly decreased from the AOD to LF processes. Therefore, the higher -TiO2 activity of slag and lower equilibrium oxygen content suppressed the undesirable reactions between Ti and O. 展开更多
关键词 321 Austenitic stainless steel Oxygen content INCLUSION TiO2-rich CaO–Al2O3-based slag Ladle furnace(LF)refining process Ion–molecule coexistence theory
A novel laminated metal composite with superior interfacial bonding composed of ultrahigh strength maraging steel and 316L stainless steel 认领
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作者 Le Zhang Wei Wang +2 位作者 M.Babar Shahzad Yi-yin Shan Ke Yang 《钢铁研究学报:英文版》 SCIE EI CAS CSCD 2020年第4期433-439,共7页
A 5-layer laminated metal composite composed of ultrahigh-strength maraging steel and ductile 316L stainless steel was fabricated by hot pressing in vacuum and post-heat treatment.Microstructure characterization on hi... A 5-layer laminated metal composite composed of ultrahigh-strength maraging steel and ductile 316L stainless steel was fabricated by hot pressing in vacuum and post-heat treatment.Microstructure characterization on hierarchical structure of the composite before and after heat treatment was made by optical microscopy,scanning electron microscopy and electron back-scattered diffraction technique,respectively.Meanwhile,the difference of mechanical performance on both sides of the interface was characterized by nano-hardness testing.Uniaxial tensile test showed that superior interfacial bonding was achieved due to the micro-‘bite’structure between the two steels without obvious defects or oxides at the interface and with coordinated deformation of the two components.Thus,a laminated metal composite consisting of two different constituents with extreme difference in strength can be well fabricated. 展开更多
关键词 Maraging steel Austenitic stainless steel Laminated metal composite Hierarchical structure INTERFACIAL
Influence of sulfur on inclusion and pitting resistance of 316L stainless steel 认领
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作者 CHEN Dexiang QIANG Shaoming 《宝钢技术研究:英文版》 CAS 2020年第3期31-38,共8页
The effect of the sulfur content on the microstructure and inclusions of 316 L stainless steel was studied by optical microscopy,scanning electron microscopy,and image analysis,and the effect of sulfur on the pitting ... The effect of the sulfur content on the microstructure and inclusions of 316 L stainless steel was studied by optical microscopy,scanning electron microscopy,and image analysis,and the effect of sulfur on the pitting corrosion resistance of 316 L stainless steel was studied by conducting ferric chloride immersion test and plotting the electrochemical polarization curves.The results show that the added sulfur is mainly in the form of manganese sulfide inclusions in 316 L stainless steel.With increases in the sulfur content,the grade and percentage of the sulfide in the steel gradually increased,and its distribution became increasingly dense.When the sulfur content exceeded0.1%,the number of sulfide inclusions in the sample increased sharply.When the sulfur content reached 0.199%,the sulfides in the steel were primarily in spindle form,and a large number of spindles were found to refine the grain size of 316 L stainless steel.The pitting corrosion weight loss rate of 316 L stainless steel increased with increases in the sulfur content,while the pitting potential gradually decreased.However,the pitting potential of 316 L stainless steel rebounded when the sulfur content reached 0.199%,which may be related to the grain refinement of the test steel and requires further study. 展开更多
关键词 stainless steel manganese sulfide pitting corrosion resistance pitting potential
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A new strategy for corrosion protection of porous stainless steel using polypyrrole films 认领
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作者 C.Garcia-Cabezon C.Garcia-Hernandez +1 位作者 M.L.Rodriguez-Mendez F.Martin-Pedrosa 《材料科学技术:英文版》 SCIE EI CAS CSCD 2020年第2期85-95,共11页
In this work,a method to improve the protection against corrosion of porous sintered stainless steel is presented.It is based on the electrodeposition of polypyrrole(PPy)layers doped with a large size counterion such ... In this work,a method to improve the protection against corrosion of porous sintered stainless steel is presented.It is based on the electrodeposition of polypyrrole(PPy)layers doped with a large size counterion such as dodecylbenzenesulphonic acid(DBSA),a conducting polymer with high corrosion resistance and good biocompatibility.The efficacy of PPy coating depends on the adequate adhesion between the metal substrate and the coating layer.The protection against corrosion has been tested using 316 L stainless steel(SS)powder sintered at different conditions to evaluate the effect of the sintering atmosphere(nitrogen and vacuum)and cooling rates(furnace and water)on corrosion resistance,while wrought 316 L SS has been used as reference material.In addition,two electrochemical deposition techniques have been tested to select the most adequate.Open circuit potential evolution,anodic polarization measurements and electrochemical impedance spectra have been used to evaluate corrosion protection in phosphate buffer saline medium.It has been evidenced that a more homogeneous and stable coating was obtained in the case of porous stainless steel.The corrosion potential shifted to nobler values and the anodic polarization branch became more stable.Coated porous samples have a good passivation performance with a lower stable passive current density and a higher breakdown potential.The transfer electronic resistance and the impedance module increase more than one order of magnitude.Therefore,the porosity of sintered stainless steel is seen as an advantage for the improvement of the adherence of the PPy coatings.The best corrosion protection is found for samples sintered in nitrogen and water-cooled. 展开更多
关键词 STAINLESS steel POWDER METALLURGY Protection corrosion Electrodeposited FILMS Polymer coatings
Effect of yttrium addition on microstructure, mechanical and corrosion properties of 20Cr13 martensitic stainless steel 认领
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作者 Qi-yu Zang Yang-fan Jin +1 位作者 Tuo Zhang Yi-tao Yang 《钢铁研究学报:英文版》 SCIE EI CAS CSCD 2020年第4期451-460,共10页
The effects of rare-earth yttrium(Y)element on the microstructure,mechanical properties and corrosion properties of 20Cr13 martensitic stainless steel were investigated by optical microscopy,scanning electron microsco... The effects of rare-earth yttrium(Y)element on the microstructure,mechanical properties and corrosion properties of 20Cr13 martensitic stainless steel were investigated by optical microscopy,scanning electron microscopy and tensile test.Electrochemical experiments were carried out to study the effect of rare-earth element Y addition on corrosion resistance.The results showed that the addition of 0.02 wt.%rare-earth yttrium to martensitic stainless steel could affect the microstructure transformation,and Ac3 temperature was obviously increased.In the stainless steel after heat treatment,there were more pro-eutectoid ferrite in the steel with 0.02 wt.%yttrium.The mechanical test results showed that the addition of 0.02 wt.%yttrium could significantly improve the tensile strength and elongation of the steel,which was related to the influence of yttrium element on inclusions in the test steel.With the quenching temperature of 0.02 wt.%yttrium steel increasing,the content of the ferrite in steel was affected and the corrosion resistance was remarkably improved. 展开更多
关键词 YTTRIUM Martensitic stainless steel Mechanical property Microstructural characterization CORROSION
Improvement in classification accuracy of stainless steel alloys by laser-induced breakdown spectroscopy based on elemental intensity ratio analysis 认领
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作者 Sungho SHIN Youngmin MOON +3 位作者 Jaepil LE Eunsung KWON Kyihwan PARK Sungho JEONG 《等离子体科学与技术:英文版》 SCIE EI CAS CSCD 2020年第7期83-91,共9页
Laser-induced breakdown spectroscopy(LIBS) is a useful technique for accurate sorting of metal scrap by chemical composition analysis.In this work,a method for intensity-ratiobased LIBS classification of stainless ste... Laser-induced breakdown spectroscopy(LIBS) is a useful technique for accurate sorting of metal scrap by chemical composition analysis.In this work,a method for intensity-ratiobased LIBS classification of stainless steel applicable to highly fluctuating LIBS signal conditions is proposed.The spectral line pairs for intensity ratio calculation are selected according to elemental concentration and upper levels of emission lines.It is demonstrated that the classification accuracy can be significantly improved from that of full-spectra principal component analysis or intensity-based analysis.The proposed method is considered to be suited to an industrial scrap sorting system that requires minimal maintenance and low system price. 展开更多
关键词 laser-induced breakdown spectroscopy(LIBS) stainless steel classification intensity ratio
Surface modification of 316L stainless steeldiamond-like carbon films 认领
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作者 Rui-wu Li Zheng Zhang +4 位作者 Jian-wei Li Ke-xin Ma Yuan-yuan Guo Yan-wen Zhou Fa-yu Wu 《钢铁研究学报:英文版》 SCIE EI CAS CSCD 2020年第7期867-874,共8页
The diamond-like carbon(DLC)film on 316L stainless steel substrate was preparedpulsed plasma-enhanced chemical vapor deposition,and the performance of the films was optimizedregulating the pulse voltage.Microstructure... The diamond-like carbon(DLC)film on 316L stainless steel substrate was preparedpulsed plasma-enhanced chemical vapor deposition,and the performance of the films was optimizedregulating the pulse voltage.Microstructure and properties of DLC film on 316L stainless steel were characterizedatomic force microscopy,field-emission scanning electron microscopy,Raman spectra,nano-indenter and electrochemical workstations.The results showed that DLC films with smooth and dense morphology have a low friction coefficient and high nano-indentation hardness,and the surface hardness of 316L stainless steel substrate was enhancedmore than 3 times.The mechanical properties of DLC films and their bond with 316L stainless steel could be further optimizedincreasing pulse voltage.DLC films on 316L stainless steel substrate increased the self-corrosion potential0.173 V and decreased self-corrosion current99%,which significantly improved the anti-corrosive properties of 316L substrate. 展开更多
关键词 316L stainless steel Diamond-like carbon film Plasma enhanced chemical vapor deposition Frictional wear Nano-indentation Corrosion resistance
Microbiologically influenced corrosion of 304 stainless steel by halophilic archaea Natronorubrum tibetense 认领
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作者 Hongchang Qian Lingwei Ma +4 位作者 Dawei Zhang Ziyu Li Luyao Huang Yuntian Lou Cuiwei Du 《材料科学技术:英文版》 SCIE EI CAS CSCD 2020年第11期12-20,共9页
The corrosion behavior of 304 stainless steel(SS)in the presence of aerobic halophilic archaea Natronorubrum tibetense was investigated.After 14 days of immersion,no obvious pitting pit was observed on the SS surface ... The corrosion behavior of 304 stainless steel(SS)in the presence of aerobic halophilic archaea Natronorubrum tibetense was investigated.After 14 days of immersion,no obvious pitting pit was observed on the SS surface in the sterile medium.By contrast,the SS exhibited serious pitting corrosion with the largest pit depth of 5.0μm in the inoculated medium after 14 days.The results of electrochemical tests showed that the barrier property of the passive film decreased faster in the inoculated medium.The X-ray photoelectron spectroscopy results indicated that the detrimental Fe2+and Cr6+increased in the passive film under the influence of archaea N.tibetense,which resulted in the accelerated deterioration of passive film and promoted the pitting corrosion.Combined with the energy starvation tests,the microbiologically influenced corrosion mechanism of 304 SS caused by halophilic archaea N.tibetense was discussed finally. 展开更多
关键词 STAINLESS STEEL ARCHAEA Microbiological influenced corrosion
Evaluation of Propargyl Alcohol as a Corrosion Inhibitor for Duplex Stainless Steel in Hydrochloric Acid 认领
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作者 Fernando Benedicto Mainier Virgílio P.dos Reis +1 位作者 Edilson Ferreira de Barros Brígida B.de Almeida 《土木工程与建筑:英文版》 2020年第7期378-384,共7页
ASTM A182 F51 duplex stainless steel with a 50:50 ratio of austenite to ferrite microstructure is a material used in mechanical engineering.Its uses include the manufacturing of equipment and components subject to aci... ASTM A182 F51 duplex stainless steel with a 50:50 ratio of austenite to ferrite microstructure is a material used in mechanical engineering.Its uses include the manufacturing of equipment and components subject to acidification or acid stimulation for oil and gas industries.During acid stimulation or acidification,hydrochloric acid(HCl)solution with concentrations ranging from 5%to 28%(by volume)is injected into the limestone(CaCO3)and dolomite(CaCO3·MgCO3)reservoir rock to restore permeability and consequently increase oil well productivity.Therefore,it is important to use a corrosion inhibitor,such as propargyl alcohol,to prevent or inhibit the aggressive attack of HCl on duplex stainless steel.The present study evaluates the corrosion resistance of ASTM A182 F51 stainless steel using gravimetric(mass loss)and electrochemical(polarization)tests.Studies were completed with and without the addition of 500 and 1,000 mg/L propargyl alcohol in HCl solutions with concentrations of 10%and 15%(by volume)at temperatures of 25,40 and 55°C.The good protection by propargyl alcohol of duplex steel immersed in HCl is observed. 展开更多
关键词 DUPLEX STAINLESS steel corrosion inhibitor PROPARGYL alcohol hydrochloric ACID ACID STIMULATION
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Characterizations of dissimilar S32205/316L welds using austenitic, super-austenitic and super-duplex filler metals 认领
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作者 A.Taheri B.Beidokhti +1 位作者 B.Shayegh Boroujeny A.Valizadeh 《矿物冶金与材料学报:英文版》 SCIE EI CAS CSCD 2020年第1期119-127,共9页
UNS S32205 duplex stainless steel plates were welded to AISI 316 L stainless steel using the pulsed gas tungsten arc welding process with three different filler metals: ER2594, ER312, and ER385. The microstructures of... UNS S32205 duplex stainless steel plates were welded to AISI 316 L stainless steel using the pulsed gas tungsten arc welding process with three different filler metals: ER2594, ER312, and ER385. The microstructures of the welds were characterized using optical and scanning electron microscopy, and all of the specimens were evaluated by ferrite measurements. The mechanical properties were studied through hardness,tensile, and impact tests. In addition, the pitting resistance equivalent number was calculated and cyclic polarization tests were performed to evaluate the corrosion resistance of the weld metal. The results showed that chromium nitride was formed in the heat-affected zone of the duplex side,whereas no sigma phase was detected in any of the specimens. The ferrite number increased from the root pass to the final pass. The absorbed energies of the impact test decreased with increasing ferrite number, whereas the tensile strength was enhanced. The fully austenitic microstructure of the specimen welded with ER385 exhibited the highest resistance to pitting corrosion at 25°C, and the super-duplex weld metal presented superior corrosion resistance at 50°C. 展开更多
关键词 STAINLESS steel mechanical properties microstructure WELDING
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Water quality induced corrosion of stainless steel valves during long-term service in a reverse osmosis system 认领
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作者 Xiyan Xu Shuming Liu +6 位作者 Ying Liu Kate Smith Xiaoting Wang Junyu Li Ziqing Ma Zhangqing Wang Yong Cui 《环境科学学报:英文版》 SCIE EI CAS CSCD 2020年第3期218-226,共9页
The current study analyzes the contribution of 10 water quality parameters(including pH,turbidity,conductivity,total dissolved solids(TDS),hardness,total organic carbon(TOC),alkalinity,calcium ions,chlorides and sulfa... The current study analyzes the contribution of 10 water quality parameters(including pH,turbidity,conductivity,total dissolved solids(TDS),hardness,total organic carbon(TOC),alkalinity,calcium ions,chlorides and sulfates) to corrosion extent of stainless steel valves taken from different locations in a reverse osmosis system of a reclaimed water plant.The valves were in service for 5 years.Raman spectroscopy and X-ray photoelectron spectroscopy analyses are conducted to quantify corrosion products on different valves under various water quality conditions.On that basis,bivariate and multivariate regression analyses between the 10 water quality parameters and the corrosion extent of valve specimens(represented by metal loss percentage(MLP) values) are carried out to check the contribution of those water quality parameters to MLP.The results indicate that the proportions of metal oxides as corrosion products vary according to the corrosion extent of the valves.Although no linear correlation is founds all 10 water quality parameters except for pH show a significant positive correlation with the MLP values of the valve specimens.Moreover,results of multivariate regression suggest that the variation of MLP can be explained by turbidity,TDS,TOC and sulfates.A positive contribution of turbidity,TDS and TOC to MLP is observed,whereas the contribution of sulfates is negative.The results from the current work help to identify the reasons for water quality-induced failure of stainless steel equipment in RO systems. 展开更多
关键词 REVERSE osmosis system Water quality STAINLESS steel CORROSION Correlation
High-temperature Tensile Behavior in Coarse-grained and Fine-grained Nb-containing 25Cr-20Ni Austenitic Stainless Steel 认领
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作者 Guodong Hu Pei Wan +1 位作者 Dianzhong Li Yiyi Li 《金属学报:英文版》 SCIE EI CAS CSCD 2020年第11期1455-1465,共11页
In this study,tensile behavior of Nb-containing 25Cr-20Ni austenitic stainless steels composed of coarse or fine grains has been investigated at temperatures ranging from room temperature to 900℃.Results show that th... In this study,tensile behavior of Nb-containing 25Cr-20Ni austenitic stainless steels composed of coarse or fine grains has been investigated at temperatures ranging from room temperature to 900℃.Results show that the tensile strength of fine-grained specimens decreases faster than that of coarse-grained specimens,as the test temperature increases from 600℃ to 800℃.The rapidly decreasing tensile strength is attributed to the enhanced dynamic recovery and recrystallization,because additional slip systems are activated,and cross-slipping is accelerated during deformation in fine-grained specimens.After tensile testing at 700-900℃,sigma phases are formed concurrently with dynamic recrystallization in fine-grained specimens.The precipitation of sigma phases is induced by simultaneous recrystallization as the diffusion of alloying elements is accelerated during the recrystallization process.Additionally,the minimum ductility is observed in coarse-grained specimens at 800℃,which is caused by the formation of M23C6 precipitates at the grain boundaries. 展开更多
关键词 Austenitic stainless steels High-temperature tensile properties Grain size PRECIPITATES
Comparison Study on the Semiconductive and Dissolution Behaviour of 316L and Alloy 625 in Hydrochloric Acid Solution 认领
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作者 Zhu Wang Zi-Ru Zhang +2 位作者 Lei Zhang Zhe Feng Min-Xu Lu 《金属学报:英文版》 SCIE EI CAS CSCD 2020年第3期403-414,共12页
The corrosion behaviour of 316L and Alloy 625 was investigated using cyclic polarization,electrochemical impedance spectroscopy,X-ray photoelectron spectroscopy,Auger electron spectroscopy and induced coupled plasma-o... The corrosion behaviour of 316L and Alloy 625 was investigated using cyclic polarization,electrochemical impedance spectroscopy,X-ray photoelectron spectroscopy,Auger electron spectroscopy and induced coupled plasma-optical emis sion spectrometer.The results indicated that Alloy 625 showed better corrosion resistance than 316L and the prolonging immersion time could enhance corrosion resistance of the two alloys.The passive film formed on the surface of 316L exhibited an electronic structure of p-p heterojunction,with Fe3O4 and Cr2O3 enriched in the outer and inner layers,respectively.However,Alloy 625 presented the electronic structure of n-p heterojunction dominated by the outer Fe2O3/NiFe2O4 and inner Cr2O3.This resulted in the opposite semiconductive properties of the passive films formed on the two materials.In the acid solutions,Fe and Mo suffered from selective dissolution while Cr and Ni were relatively stable.The corrosion rates were mainly dominated by the dissolution of iron.Alloy 625 presented better corrosion resistance than 316L due to the obviously lower content of Fe and the higher content of Cr and Ni in the passive film.The continuously selective dissolution of iron resulted in the increase in Cr/Fe ratio in the passive film,which was responsible for the enhancement in corrosion resistance. 展开更多
关键词 STAINLESS steel Induced coupled plasma(ICP) POLARIZATION X-ray PHOTOELECTRON spectroscopy(XPS) PASSIVE films
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