Different grain sizes were created in a metastable 17Cr‐7Mn‐7Ni steel by martensite‐to‐austenite reversion at different temperatures using a laser beam. Two fully reverted material states obtained at 990°C and 780°C exhibited average grain sizes of 7.7 and 2.7 μm, respectively. The third microstructure (610°C) consisted of grains at different stages of recrystallization and deformed austenite. A hot‐pressed, coarse‐grained counterpart was studied for reference. The yield and tensile strengths increased with refined grain size, maintaining reasonable elongation except for the heterogeneous microstructure. Total strain‐controlled fatigue tests revealed increasing initial stress amplitudes but decreasing cyclic hardening and fatigue‐induced α′‐martensite formation with decreasing grain size. Fatigue life was slightly improved for the 2.7‐μm grain size. Contrary, the heterogeneous microstructure yielded an inferior lifetime, especially at high strain amplitudes. Examinations of the cyclically deformed microstructure showed that the characteristic deformation band structure was less pronounced in refined grains.

中文翻译：

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晶粒尺寸在激光回复退火亚稳态奥氏体钢的静态和循环变形行为中的作用

在亚稳的17Cr-7Mn-7Ni钢中，通过使用激光束在不同温度下马氏体到奥氏体的回复，产生了不同的晶粒尺寸。在990°C和780°C下获得的两种完全还原的材料状态分别显示出7.7和2.7μm的平均晶粒尺寸。第三显微组织（610℃）由处于不同再结晶阶段的晶粒和变形的奥氏体组成。研究了热压，粗粒度的对应物以供参考。屈服强度和抗拉强度随晶粒细化而增加，除非均质的微观结构外，保持合理的伸长率。总应变控制的疲劳试验表明，初始应力幅度增大，但随着晶粒尺寸的减小，循环硬化和疲劳诱导的α'马氏体形成减少。2人的疲劳生活略有改善。晶粒尺寸为7μm。相反，异质微观结构的寿命较差，尤其是在高应变幅度下。对循环变形的微观结构的检查表明，特征形变带结构在细晶粒中不太明显。