316H不锈钢蠕变-疲劳缺口效应及损伤考核准则分析  

Analysis of Notch Effect and Damage Assessment Criteria of 316H Stainless Steel Under Creep-Fatigue Loading

作　　者：龚伟忠 谈建平[1] 曾鑫 张丽屏[2] 邵雪娇[2] 苏东川[2] 刘长军[1] GONG Weizhong;TAN Jianping;ZENG Xin;ZHANG Liping;SHAO Xuejiao;SU Dongchuan;LIU Changjun(Key Laboratory of Pressure Systems and Safety,Ministry of Education,East China University of Science and Technology,Shanghai 200237,China;Nuclear Power Institute of China,Chengdu 610041,China)

机构地区：[1]华东理工大学承压系统与安全教育部重点实验室,上海200237 [2]中国核动力研究设计院,成都610041

出　　处：《动力工程学报》2023年第5期519-525,共7页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(52075174,11502082)。

摘　　要：通过开展光滑试样和不同V型缺口试样载荷控制下的蠕变-疲劳试验,研究了载荷水平、保载时间、缺口尺寸对316H不锈钢在600℃试验温度下蠕变-疲劳寿命的影响及缺口效应,探讨了ASME BPVC III-NH卷中316不锈钢蠕变-疲劳考核准则对于316H缺口试样的适用性。结果表明:316H不锈钢蠕变-疲劳寿命在短时保载下表现出缺口削弱作用,长时保载下表现出缺口强化作用;随着保载时间的增加,可观察到断口处裂纹扩展区凹坑和凸起变多,瞬断区韧窝变大变深;根据现有的试验结果,ASME规范中316不锈钢蠕变-疲劳考核准则适用于缺口构件。Influence of load level,holding time,and notch size on the creep-fatigue life of 316H stainless steel at 600°C and the notch effect were studied when the creep-fatigue tests of 316H stainless smooth bar and notched bar with different V-shapes under the controlled load were performed.The feasibility of the application of creep-fatigue assessment criteria in ASME BPVC III-NH to 316H notched bar specimens was assessed.Results show that the creep-fatigue life of 316H stainless steel exhibits notch weakening effect under short-term and notch strengthening effect under long-term loading,respectively.With the increase of holding time,more pits and bumps occur in the crack propagation area of the fracture,and the dimples in the instantaneous fracture zone become larger and deeper.According to the current experimental resluts,the creep-fatigue assessment criterion in the ASME code is suitable for assessing the notched components of 316 stainless steel.

关 键 词：316H不锈钢 缺口效应 蠕变-疲劳 考核准则 

分 类 号：TG111.8[金属学及工艺—物理冶金]