0Cr18Ni9裂纹试样的室温蠕变现象及对裂纹扩展的延滞效应  

OCCURENCE OF ROOM TEMPERATURE CREEP IN 0Cr18Ni9 CT SPECIMEN AND RETARDATION EFFECT TO SUBSEQUENT CRACK GROWTH

作　　者：莫涛[1] 赵杰[1] 聂德福[1] 王富岗[1] 

机构地区：[1]大连理工大学材料工程系,大连116023

出　　处：《机械强度》2007年第6期997-1000,共4页Journal of Mechanical Strength

基　　金：国家自然科学基金资助项目(50271013)~~

摘　　要：研究0Cr18Ni9不锈钢裂纹尖端的室温蠕变(room temperature creep,RTC)现象以及其对恒ΔK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ΔK、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,0Cr18Ni9钢裂纹尖端的室温蠕变会加大随后的裂纹扩展延滞效应。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.

关 键 词：室温蠕变 疲劳裂纹扩展 延滞 裂纹尖端 

分 类 号：TG146.11[一般工业技术—材料科学与工程]