T91/TP347H异种钢焊接接头高温时效组织对性能的影响  

Effect of High Temperature Aging Microstructure of T91/TP347H Dissimilar Steel Welded Joints on Properties

作　　者：王佳祺 靳旭乐 冷宇轩 胡连海[1] 付坤 王长才 付秋圆 WANG Jiaqi;JIN Xule;LENG Yuxuan;HU Lianhai;FU Kun;WANG Changcai;FU Qiuyuan(Hebei Provincial Key Laboratory of Traffic Engineering Materials,Shyiazhuang Tiedao University,Shijiazhuang 050043,China;Hebei Special Equipment Supervision and Inspection Institute,Shyiazhuang 050061,China)

机构地区：[1]石家庄铁道大学河北省交通工程材料重点实验室,河北石家庄050043 [2]河北省特种设备监督检验研究院,河北石家庄050061

出　　处：《热加工工艺》2021年第5期35-37,45,共4页Hot Working Technology

基　　金：河北省质量技术监督局科技计划资助项目(2017ZD08);河北省自然科学基金资助项目(E2018210099);国家市场监督管理总局科技计划资助项目(2019MK010)。

摘　　要：异种钢焊接接头广泛应用于超超临界电站锅炉结构中。采用光学显微镜、扫描电子显微镜、显微硬度计、拉伸试验机等设备对服役10年并在750℃下进行不同时间时效处理的T91/TP347H异种钢焊接接头的组织与性能进行了分析。结果表明,随着时效时间的延长,焊缝组织基本稳定,T91和TP347H的热影响区晶粒尺寸逐渐增大,析出物逐渐聚集长大,发生粗化,TP347H热影响区析出物呈断续的链状分布,割裂基体,且TP347H热影响区组织老化程度更严重。时效处理450 h的TP347H热影响区内析出物主要有M7C3型、M23C6型和MX型。力学性能测试表明,随着时效时间的延长,焊接接头显微硬度逐渐降低,屈服强度和抗拉强度逐渐减小,断裂位置均在TP347H热影响区。Dissimilar steel welded joints are widely used in ultra-supercritical power station boiler structure. The microstructure and properties of the T91/TP347 H dissimilar steel welded joints which have been in service for 10 years and aged at 750℃ for different time were analyzed by optical microscopy, scanning electron microscope, microhardness tester and tensile tester. The experimental results show, as aging time goes on, the microstructure of weld was generally unchanged, the grain size of T91 and TP347 H in the heat affected zone becomes gradually larger, precipitates gradually accumulate, grow,coarsen, the precipitates of heat affected zone of TP347 H presents a discontinuous chain distribution and split the matrix, and the aging microstructure of TP347 in heat affected zone is more serious. The precipitates in the TP347 H heat affected zone for450 h aging time mainly include M7 C3 type, M23 C6 type and MX type. The mechanical properties test results show that, with the aging time increasing, the microhardness of welded joints gradually decreases, the yield strength and tensile strength of welded joints gradually decrease. The fracture position of all the welded joints is located at the TP347 H heat affected zone.

关 键 词：异种钢焊接接头 高温时效 析出物 微观组织 力学性能 

分 类 号：TG441.8[金属学及工艺—焊接]