中文摘要：

研究OCr18Ni9不锈钢裂纹尖端的室温蠕变（room temperature creep，RTC）现象以及其对恒△K条件下疲劳裂纹扩展行为的影响作用。结果表明，在一定的载荷条件下，裂纹尖端出现明显的室温蠕变。文中同时讨论初始应力强度因子幅△K、加载速率r和恒载应力强度因子KRTC与室温蠕变量之间的关系。与单峰过载条件下相比，OCr18Ni9钢裂纹尖端的室温蠕变会加大随后的裂纹扩展延滞效应。

英文摘要：

Room temperature creep at crack tip of a OCr18Ni9 stainless steel and its effect on the following fatigue crack growth have been investigated. A time-dependent deformation at crack tip of the steel has been observed at room temperature under constant load. The influences of stress intensity factor range △K, loading rate r and holding load KRTc Oil the level of room temperature creep have also been discussed. Compared with single overload, the occurrence of room temperature creep at crack tip results in more serious retardation for crack propagation.