In the present study, strain-controlled low cycle fatigue (LCF) behaviour of SS 316L at room temperature (RT) and −80 ℃ were investigated. RT LCF specimens show cyclic softening, whereas −80 ℃ specimens show initial cyclic softening followed by hardening due to strain-induced martensitic transformation (SIMT). Fatigue damage evolution mechanism is proposed for specimens tested at −80 °C, where compressive stresses develop due to SIMT and retards the crack growth. This leads to an increase in fatigue life for −80 °C specimens. An increase in back stress component at the initiation of secondary hardening is noticed for −80 °C specimens.

在本研究中，研究了 SS 316L 在室温 (RT) 和 -80 ℃ 下的应变控制低周疲劳 (LCF) 行为。RT LCF 试样显示循环软化，而 -80 ℃ 试样显示初始循环软化，随后由于应变诱导马氏体转变 (SIMT) 而硬化。对于在-80°C 下测试的试样，提出了疲劳损伤演化机制，其中由于 SIMT 会产生压应力并延缓裂纹扩展。这导致 -80 °C 试样的疲劳寿命增加。对于-80 °C 的试样，注意到二次硬化开始时背应力分量的增加。