高温过热器TP347H钢管焊接接头开裂原因  

Reasons for cracking of welded joint of TP347H steel pipe in high temperature superheater

作　　者：谭晓蒙 陈浩 乔欣 郭心爱 TAN Xiaomeng;CHEN Hao;QIAO Xin;GUO Xinai(Inner Mongolia Power Research Institute Branch,Inner Mongolia Power(Group)Co.,Ltd.,Huhhot O10020,China)

机构地区：[1]内蒙古电力(集团)有限责任公司,内蒙古电力科学研究院分公司,呼和浩特010020

出　　处：《理化检验（物理分册）》2022年第12期73-76,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

基　　金：2020年内蒙古电力科学研究院科技项目(2020-ZC-04)。

摘　　要：某高温过热器TP347H钢管焊接接头多次发生开裂,采用宏观观察、化学成分分析、金相检验、扫描电子显微镜及能谱分析、力学性能测试和双环电化学动电位再活化法试验对其开裂原因进行分析。结果表明:TP347H钢管焊接接头开裂性质为晶间型应力腐蚀开裂,焊接时循环热导致的管材热影响区敏化以及焊接接头的残余应力是其开裂的主要原因。The welding joint of TP347H steel pipe of a high temperature superheater cracked several times. The cracking reasons were analyzed by macroscopic observation, chemical composition analysis, metallographic examination, scanning electron microscope and energy spectrum analysis, mechanical properties test and double-loop electrochemical potentiokinetic reactivation method test. The results show that the cracking property of TP347H steel pipe welded joint was intergranular stress corrosion cracking. The main causes of cracking were the sensitization of pipe heat affected zone caused by circulating heat during welding and the residual stress of welded joint.

关 键 词：TP347H钢 焊接接头 奥氏体不锈钢 晶间型应力腐蚀开裂 敏化 残余应力 

分 类 号：TG115.2[金属学及工艺—物理冶金]