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...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.展开更多
介绍高速机车用301L不锈钢无缝管的研发情况。采用热穿孔工艺制备301L不锈钢荒管,再通过多道次的冷轧变形成功研制出Φ44mm×2 mm规格的无缝管材。结果表明:经过冷轧变形,钢管沿轧制方向产生了大量的马氏体组织,加工硬化明显;随后经...介绍高速机车用301L不锈钢无缝管的研发情况。采用热穿孔工艺制备301L不锈钢荒管,再通过多道次的冷轧变形成功研制出Φ44mm×2 mm规格的无缝管材。结果表明:经过冷轧变形,钢管沿轧制方向产生了大量的马氏体组织,加工硬化明显;随后经950℃固溶处理、再结晶充分,晶粒均匀。开发的301L不锈钢无缝管的化学成分、组织及性能均满足ASTM A 666-2015标准要求。展开更多
基金Shahid Chamran University of Ahvaz for supporting this research
文摘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.
文摘介绍高速机车用301L不锈钢无缝管的研发情况。采用热穿孔工艺制备301L不锈钢荒管,再通过多道次的冷轧变形成功研制出Φ44mm×2 mm规格的无缝管材。结果表明:经过冷轧变形,钢管沿轧制方向产生了大量的马氏体组织,加工硬化明显;随后经950℃固溶处理、再结晶充分,晶粒均匀。开发的301L不锈钢无缝管的化学成分、组织及性能均满足ASTM A 666-2015标准要求。
