T91/TP347H异种钢焊接接头服役微观组织转变  

Microstructure transformation of T91/TP347H dissimilar steel welded joint after service

作　　者：李敏 邓守浩 刘川槐 沈利 潘卫国 陈云霞[3] Li Min;Deng Shouhao;Liu Chuanhuai;Shen Li;Pan Weiguo;Chen Yunxia(Shanghai University of Electric Power,Shanghai 201306,China;Fengtai Power Generation Branch of Huaizhe Coal Power Co.,Ltd.,Huainan 232131,Anhui,China;Shanghai Dianji University,Shanghai 201306,China)

机构地区：[1]上海电力大学,上海201306 [2]淮浙煤电有限公司凤台发电分公司,安徽淮南232131 [3]上海电机学院,上海201306

出　　处：《焊接》2022年第1期14-20,共7页Welding & Joining

基　　金：国家自然科学基金资助项目(52005315)。

摘　　要：异种钢焊接接头在超超临界电站锅炉结构中应用广泛。采用XRD,SEM及EDS及显微硬度对原始态和服役1×10^(5)h的T91/TP347H异种钢焊接接头的相组成、显微组织形貌和元素组成进行了表征分析,并采用显微硬度计对2种接头的显微硬度进行了测试。结果表明,相较于原始态,服役1×10^(5)h的接头TP347H母材晶粒更为粗大,T91和TP347H的热影响区强化相粗化,焊缝有M_(23)C_(6)和Nb(C,N)析出。2种状态的焊接接头硬度最高值均出现在T91侧热影响区,最低值均在TP347H母材,服役1×10^(5)h的焊接接头焊缝的硬度较原始态有显著提高。The welded joints of dissimilar steels are widely used in ultra-supercritical power station boiler structure.The microstructure,elements and phase composition of T91/TP347H dissimilar welded joints in original state and service for 1×10^(5)h were analyzed by OM,SEM,EDS and XRD,and the microhardness of these two welded joints was tested by microhardness tester.The results showed that,compared with the original state,grains of TP347H base metal after 1×10^(5)h service were larger,the strengthening phases of T91 and TP347H in heat affected zone got coarsened,and M_(23)C_(6)and Nb(C,N)precipitated in the weld.The maximum hardness of both welded joints appeared in the heat affected zone of T91,and the minimum hardness of both welded joints appeared in the base metal of TP347H.Compared with the original state,the hardness of welded joints after 1×10^(5)h service increased significantly.

关 键 词：T91钢 TP347H钢 异种钢焊接接头 微观组织 显微硬度 

分 类 号：TG457.11[金属学及工艺—焊接]