经长时服役的超临界锅炉T91/TP347H异种钢接头性能分析  

Performance of T91/TP347H Dissimilar Steel Welded Joint of Supercritical Boiler after Long-term Service

作　　者：何朋非 张仁魁 周梦保 HE Pengfei;ZHANG Renkui;ZHOU Mengbao(Hunan Xiangdian Boiler&Pressure Vessel Inspection Center Co.,Ltd.,Changsha 410004,China)

机构地区：[1]湖南省湘电锅炉压力容器检验中心有限公司,湖南长沙410004

出　　处：《热加工工艺》2024年第9期87-90,共4页Hot Working Technology

基　　金：湖南省湘电锅炉压力容器检验中心有限公司资助项目(XDKY-2020-03)。

摘　　要：对某超临界锅炉运行7.5万小时的T91/TP347H异种钢接头,采用金相显微镜、万能材料试验机和扫描电镜等仪器设备,研究长时服役后T91/TP347H异种钢接头的性能。结果表明:该异种钢接头薄弱区在T91熔合线处,该位置链状孔洞和脱碳层的形成大大弱化了力学性能,氧化缺口的形成加速了接头的开裂。异种钢接头各区域的冲击性能显著降低,其中焊缝冲击性能最低,实测仅为66 J。For T91/TP347H dissimilar steel joints of a supercritical boiler operating for 75,000 h,the metallographic microscope,the universal material testing machine and the scanning electron microscope were used to study the performance of the joint after long-termservice.The results show that the weak area of the dissimilar steel joint is at the T91 fusion line,the formation of chain holes and decarburization layer in the region greatly weaken the mechanical properties,and the formation of oxidation gap accelerates the cracking of the joint.The impact performance of each area of the dissimilar steel joint is significantly reduced,and the impact performance of the weld metal is the lowest,which is only 66 J.

关 键 词：异种钢接头 T91 TP347H 脱碳层 长时服役 

分 类 号：TG407[金属学及工艺—焊接]