摘要
针对检验中发现的Q345R+S22053复合板压力容器接管腐蚀和开裂的现象,采用化学成分、金相组织、力学试验、断口形貌、模拟试验等方法对失效原因进行了分析。结果表明,针对容器的消除应力热处理工艺,会导致S22053材料组织中铁素体相内、铁素体/奥氏体相晶界处析出脆性相颗粒,降低材料的耐腐蚀性能、弱化晶界强度;当运行温度高于临界点腐蚀温度时,缺陷部位(晶界、析出相)优先萌生裂纹并扩展。
In view of corrosion and cracking phenomenon of Q345R+S22053 composite pressure vessel nozzle found in the inspection,the failure causes were analyzed by chemical composition,metallographic structure,mechanical test,fracture morphology and simulation test.The results show that the stress-relieving heat treatment process for vessels will lead to precipitation of brittle particles in the ferrite phase and at the grain boundary of ferrite/austenite phase in the structure of S22053 material,which will reduce the corrosion resistance of the material and weaken the strength of grain boundary.When the operating temperature is higher than the critical corrosion temperature,the defects(grain boundary,precipitated phase)preferentially initiate cracks and expand.
作者
李亚军
刘绍东
童根
宋晓俊
柳楠
宋文明
卢雪梅
LI Yajun;LIU Shaodong;TONG Gen;SONG Xiaojun;LIU Nan;SONG Wenming;LU Xuemei(CNPC TARIM Oilfield Company,Korla 841000,China;Machinery Industry Shanghai Lanya Petrochemical Equipment Inspection Institute Co.,Ltd.,Shanghai 201518,China)
出处
《压力容器》
北大核心
2022年第6期68-74,共7页
Pressure Vessel Technology
基金
中石油塔里木油田公司研究项目“2205双相不锈钢钢管质量控制及焊接工艺优化”(TLM201019104008)。
