焊后热处理对热丝TIG焊接10Cr9Mo1VNb锅炉用钢组织性能的影响  

Effect of post weld heat treatment on microstructure and properties of hot wire TIG welded 10Cr9Mo1VNb boiler steel

作　　者：赖春明 李琴[1] 周家林[2] 吴兴欢[1] 黄艳 Lai Chunming;Li Qin;Zhou Jialin;Wu Xinghuan;Huang Yan(School of Mechanical Engineering,Hunan Chemical Vocational Technology College,Zhuzhou Hunan 412011,China;Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan Hubei 430081,China;Hunan Chemical Engineering Design Institute Co.,Ltd.,Changsha Hunan 410007,China)

机构地区：[1]湖南化工职业技术学院机械工程学院,湖南株洲412011 [2]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081 [3]湖南化工设计院有限公司,湖南长沙410007

出　　处：《金属热处理》2024年第9期169-175,共7页Heat Treatment of Metals

基　　金：湖南省教育厅科学研究项目优秀青年项目(23B0966);湖南省自然科学基金科教联合基金(2022JJ60042)。

摘　　要：对10Cr9Mo1VNb锅炉用钢进行了热丝TIG多层多道焊接试验,并对焊接接头进行不同温度(740~790℃)和不同时间(1~4 h)的焊后热处理,采用硬度、金相、室温拉伸以及夏比摆锤冲击、SEM等试验手段分析了焊后热处理对接头组织性能的影响。结果表明,焊后热处理可以把焊接过程中接头形成的马氏体转变为回火马氏体,从而使接头各个区域的组织性能的均匀性得到明显改善。在740℃下进行热处理,随着热处理时间增加,强度小幅度降低,塑性与韧性均得到进一步改善。而在790℃下进行热处理,强度、塑性和韧性会随着时间的增加而降低,这主要是因为接头中M_(23)C_(6)型碳化物发生了粗化。Hot wire TIG multi-layer and multi pass welding tests were conducted on 10Cr9Mo1VNb boiler steel,and the welded joints were subjected to post weld heat treatment at different temperatures(740-790℃)and time(14 h).The effects of post weld heat treatment on the microstructure and properties of the joints were analyzed using hardness,metallography,room temperature tensile testing,Charpy impact testing,SEM and other experimental methods.The results show that the post weld heat treatment can transform the martensite formed in the welding process into tempered martensite,which can significantly improve the uniformity of the microstructure and properties of each zone of the joint.When subjected to heat treatment at 740 ℃,the strength slightly reduces with the increase of heat treatment time,while both the plasticity and toughness further improve.However,when subjected to heat treatment at 790℃,the strength,plasticity and ductility decrease with the increase of time,mainly due to the coarsening of carbides such as M_(23)C_(6) in the joint.

关 键 词：焊后热处理 热丝TIG焊 10Cr9Mo1VNb锅炉用钢 显微组织 力学性能 

分 类 号：TG441.8[金属学及工艺—焊接]