The hybrid stress–strain controlled creep-fatigue interaction (HCFI) loadings at various dwell conditions were conducted on 9%Cr steel at 625 °C to investigate the deformation and damage mechanisms. Results reveal that the HCFI tests with conservative dwell conditions show complicated cyclic responses and low creep strain. The failure specimens demonstrate strong creep-fatigue interaction damage (CFID) with many branched surface cracks. With the increase in dwell stress and time, the HCFI tests show continuous softening and remarkable creep deformation. The creep-dominant damage (CDD) featured by internal creep cavities and blunt surface cracks leads to the final failure.

在 625°C 下对 9%Cr 钢在各种驻留条件下进行混合应力-应变控制蠕变-疲劳相互作用 (HCFI) 载荷，以研究变形和损坏机制。结果表明，具有保守驻留条件的 HCFI 测试显示出复杂的循环响应和低蠕变应变。破坏试样表现出强烈的蠕变疲劳相互作用损伤 (CFID)，具有许多分支的表面裂纹。随着保压应力和时间的增加，HCFI 测试显示连续软化和显着的蠕变变形。以内部蠕变空腔和钝表面裂纹为特征的蠕变主导损伤 (CDD) 导致最终失效。