The AISI type 304L stainless steel (SS) was solution annealed at 1050 °C and cryo-rolled at liquid nitrogen (L-N₂) temperature (77 K) under severe plastic deformation (SPD). The thickness reduction through cryo-rolling plastic deformation was carried out up to 90% (designated as CR-90) of initial thickness. The cryo-rolling during rolling at liquid N₂ temperature (77 K), resulted in transformation induced plastic deformation of the austenite γ-phase into α’- martensite phase. The phase transformation was characterized by x-ray diffraction (XRD) and saturation magnetization (M_s) measurement. The microstructure was measured by using optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The XRD peak positions confirmed the martensite (α’) phase formation. Saturation magnetization (Ms) value of the cryo-rolled specimens shows increasing linearity with cryo-rolling, and transformed to bct martensite (α’). The measured corrosion rate of the cryo-rolled specimens as per ASTM A-262 practice-C test (Huey test) ranges from 6.6 mpy or 0.167 mm/yr (CR 0) to 12.9 mpy or 0.328 mm/yr (CR 90), indicating the effects of severe deformation of strain-induced martensite with the cryo-rolling. Further, the role of severe deformation of strain-induced martensite with the cryo-rolling on AISI type 304L SS and also influence on the corrosion resistance are investigated in detail. The deformation microstructure roles, i.e., the phases and volume percentage induced by the different percentage of the cryo-rolling that influences the corrosion resistance properties and corresponding corrosion resistance in nitric acid have been investigated.

将AISI 304L不锈钢（SS）在1050°C下进行固溶退火，并在严重塑性变形（SPD）下在液氮（LN ₂）温度（77 K）进行冷轧。通过冷轧塑性变形进行的厚度减小达到初始厚度的90％（称为CR-90）。在液态N ₂温度（77 K）下轧制过程中的低温轧制导致奥氏体γ相转变为α'-马氏体相的塑性诱导变形。通过X射线衍射（XRD）和饱和磁化强度（M _s） 测量。通过使用光学显微镜（OM），扫描电子显微镜（SEM）和透射电子显微镜（TEM）来测量微观结构。XRD峰位置证实了马氏体（α'）相的形成。低温轧制样品的饱和磁化强度（Ms）值随低温轧制显示出线性增加，并转变为bct马氏体（α'）。根据ASTM A-262惯例C测试（Huey测试）测得的冷轧试样腐蚀速率为6.6 mpy或0.167 mm / yr（CR 0）至12.9 mpy或0.328 mm / yr（CR 90），表明应变诱发的马氏体随着冷轧而严重变形的影响。此外，详细研究了应变诱发马氏体在AISI 304L SS型钢上进行冷轧时的严重变形及其对耐腐蚀性的影响。