In the present work, 304L-austenitic stainless steel has been successfully processed till two passes of constrained groove pressing (CGP). The processed steel has been characterized using X-ray diffraction and a vibrating sample magnetometer. The XRD patterns and vibrating sample magnetometer confirms phase transformation (austenitic phase to martensitic phase). CGP of 304L austenitic steel improves mechanical properties such as tensile strength, yield strength and micro-hardness. The ultimate tensile strength value improves from 775 MPa to 1156 MPa, the value of yield strength improves from 332 MPa to 639 MPa and the microhardness improves from 244 VHN to 476 VHN for solution-treated, and two pass CGP processed specimens, respectively. The influence of CGP has also been reflected in electron backscatter diffraction (EBSD) results in terms of more substructure formation. The corrosion behavior has been estimated via linear polarization and electrochemical impedance spectroscopy tests. The CGPed 304L steel shows poor resistance to corrosion in comparison to parent steel. Polarization resistance values decrease from 27.88 to 12.63 kΩ/cm2 which represents loose and less protective passivating film after CGP.

中文翻译：

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约束槽压加工304L奥氏体钢力学行为及腐蚀研究

在目前的工作中，304L-奥氏体不锈钢已成功加工到两道约束槽压制（CGP）。使用 X 射线衍射和振动样品磁强计对加工后的钢进行了表征。XRD 图案和振动样品磁力计证实了相变（奥氏体相到马氏体相）。304L奥氏体钢的CGP提高了抗拉强度、屈服强度和显微硬度等机械性能。对于固溶处理和两次通过 CGP 处理的试样，极限抗拉强度值从 775 MPa 提高到 1156 MPa，屈服强度值从 332 MPa 提高到 639 MPa，显微硬度从 244 VHN 提高到 476 VHN。CGP 的影响也反映在电子背散射衍射 (EBSD) 结果中，以形成更多的亚结构。腐蚀行为已通过线性极化和电化学阻抗谱测试进行评估。与母钢相比，CGPed 304L 钢显示出较差的耐腐蚀性。极化电阻值从 27.88 降至 12.63 kΩ/cm2，这表示 CGP 后钝化膜松散且保护性较差。