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Effect of cold rolling on the microstructural, magnetic, mechanical, and corrosion properties of AISI 316L austenitic stainless steel

查看全文 作　　者：[1]S.Tanhaei;[1,2]Kh.Gheisari;S.R.Alavi [1,2]Zaree 高影响力作者 机构地区：[1]Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz;[2]Steel Research Center, Faculty of Engineering, Shahid Chamran University of Ahvaz高影响力机构 出　　处：《International Journal of Minerals,Metallurgy and Materials》索引2018年第25卷第6期,共11页高影响力期刊 基　　金：Shahid Chamran University of Ahvaz for supporting this research 摘　　要：This study has evaluated the effect of different levels of cold rolling(from 0 to 50%)on the microstructural,magnetic,and mechanical properties and the corrosion behavior of 316L austenitic stainless steel in Na Cl(1 mol/L)+H_2SO_4(0.5 mol/L)solution.Microstructural examinations using optical microscopy revealed the development of a morphological texture from coaxial to elongated grains during the cold-rolling process.Phase analysis carried out on the basis of X-ray diffraction confirmed the formation of the ferromagneticα′-martensite phase under the stresses applied during cold rolling.This finding is in agreement with magnetic measurements using a vibrating sample magnetometer.Mechanical properties determined by tensile and Vickers microhardness tests demonstrated an upward trend in the hardness-to-yield strength ratio with increasing cold-rolling percentage,representing a reduction in the material’s work-hardening ability.Uniform and localized corrosion parameters were estimated via potentiodynamic polarization corrosion tests and electrochemical impedance spectroscopy.In contrast to the uniform corrosion,wherein the corrosion current density increased with increasing cold-working degree because of the high density of microstructural defects,the passive potential range and breakdown potential increased by cold working,showing greater resistance to pit nucleation.Although pits were formed,the cold-rolled material repassivation tendency decreased because of the broader hysteresis anodic loop,as confirmed experimentally by observation of the microscopic features after electrochemical cyclic polarization evaluations. 关 键 词：316L 机械性质 微结构 不锈钢 奥氏体 滚动 AISI 腐蚀性质
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