T22/TP304H异种钢焊接接头性能分析与剩余寿命评估  

Performance Analysis and Residual Life Assessment of T22/TP304H Dissimilar Steel Welded Joints

作　　者：孙戬 朱毅 刘清 刘福广[4] 林何 刘晖 成小乐[1,2] SUN Jian;ZHU Yi;LIU Qing;LIU Fuguang;LIN He;LIU Hui;CHENG Xiaole(School of Mechanical and Electrical Engineering,Xi'an Polytechnic University,Xi'an 710048,China;Xi'an Key Laboratory of Modern Intelligent Textile Equipment,Xi'an 710048,China;Archives of Xi'an Polytechnic University,Xi'an 710048,China;Xi'an Thermal Power Research Institute Co.,Ltd.,Xi'an 710054,China)

机构地区：[1]西安工程大学机电工程学院,陕西西安710048 [2]西安市现代智能纺织装备重点实验室,陕西西安710048 [3]西安工程大学档案馆,陕西西安710048 [4]西安热工研究院有限公司,陕西西安710054

出　　处：《电焊机》2024年第6期1-6,共6页Electric Welding Machine

基　　金：国家自然科学基金青年科学基金项目(51805402);西安市现代智能纺织装备重点实验室建设项目(2019220614SYS021CG043);陕西省自然科学基础研究计划(2022JM-362)。

摘　　要：异种钢焊接在亚临界锅炉中被广泛运用,其焊接接头性能会直接影响锅炉的运行安全和服役寿命。针对已服役20万小时以上的锅炉中带垫板T22/TP304H异种钢焊接接头,采用微观组织观察、常温与高温拉伸试验以及高温持久试验等方法,全面评估了焊接接头的组织形态、力学性能和耐久性。结果表明,TP304H母材及焊缝中有析出物聚集现象,易诱发焊接区域萌生裂纹;长期服役的接头拉伸强度低于ASME标准要求的最低值,力学性能出现较大程度的衰退;通过温度曲线推算法估算,焊接接头的剩余寿命为29 745 h,但其运行可靠性已显著降低,应对接头部位进行检修并加强后期巡检工作。该研究可为T22/TP304H异种钢焊接头的组织与性能研究和设备后续的安全运行提供理论参考。Dissimilar steel welding is extensively applied in subcritical boilers,where the performance of the welded joint directly impacts the boiler's operational safety and service life.This study focuses on the T22/TP304H dissimilar steel welded joint in boilers that have been in service for over 200000 hours,analyzing the changes in its microstructure morphology and mechanical properties.The residual life of the joint is evaluated based on high-temperature endurance test results.Findings indicate that precipitate aggregation occurs in the TP304H base material and weld,which can easily induce the initiation of cracks in the welding area.The tensile strength of long-term operational joint samples is consistently lower than the minimum value required by ASME standards,indicating a significant decline in mechanical performance.The remaining life of the joint is 29745 hours,but its operational reliability has significantly decreased.Thus,it is recommended to inspect and repair the joint area and intensify subsequent inspection work.This paper provides a theoretical reference for the study of T22/TP304H dissimilar steel welded joint structure and properties,and the safe operation of the equipment in the future.

关 键 词：T22/TP304H异种钢 长期服役 力学性能衰退 剩余寿命评估 检修策略 

分 类 号：TG407[金属学及工艺—焊接]