The influence of stress rate on load/strain partitioning between different phases of a micro-alloyed 2.25Cr–Mo steel during stress-controlled fatigue deformation at room temperature (RT) was studied by conducting asymmetrical ratcheting fatigue tests employing values of 50–450 MPa/s. Fatigue life (N f) significantly reduced for tests conducted by employing = 50 MPa/s compared to 450 MPa/s, i.e. N f = 510 and 24,983 cycles respectively. From TEM studies, it is confirmed that due to load/strain partitioning stacking faults (SFs)/micro-twin formed in M23C6 carbides during high fatigue deformation, whereas dislocation cells are formed in low fatigue deformation. A plausible explanation to account for different cycle life with change in of fatigue deformation is offered.

中文翻译：

---

2.25Cr-Mo钢疲劳变形过程中基体与析出物的应变分配

通过使用 50-450 MPa 的非对称棘轮疲劳试验，研究了应力速率对室温 (RT) 应力控制疲劳变形过程中微合金化 2.25Cr-Mo 钢不同相之间的载荷/应变分配的影响/秒。与 450 MPa/s 相比，使用 = 50 MPa/s 进行的测试的疲劳寿命 (N f) 显着降低，即 N f = 510 和 24,983 次循环。透射电镜研究证实，在高疲劳变形过程中，M23C6 碳化物中由于载荷/应变分配层错 (SFs)/微孪晶形成，而在低疲劳变形过程中会形成位错胞。提供了一个合理的解释来解释随着疲劳变形变化的不同循环寿命。