电焊机2017，Vol.47Issue(8)：15-18,4.DOI:10.7512/j.issn.1001-2303.2017.08.03
X80管线钢热丝TIG焊接接头显微组织和力学性能
Microstructure and mechanical properties of hot-wire TIG welded joints of X80 pipeline steel
摘要
Abstract
Hot-wire TIG was used to weld X80 pipeline steel plate,the microstructure and mechanical properties of the welded joint were analyzed.The results show that:the microstructure of weld zone is acicular ferrite(AF),the microstructure of the coarse grain heat-affected zone is granular bainite(GB) and bainite ferrite(BF),and the microstructure of the fine grain heat-affected zone is polygonal ferrite(PF) and bainite;the average tensile strength of the welded joint is 643 MPa at room temperature.At-30 ℃,the impact absorption of weld zone is higher than that of heat affected zone,the weld is mainly composed of ductile and brittle fracture,and HAZ is mainly brittle fracture.The microhardness of the welded zone is higher than others,softening and hardening are founded in the heat-affected zone.关键词
X80管线钢/热丝TIG焊/焊接接头/显微组织/力学性能Key words
X80 pipeline steel/hot-wire TIG/welded joint/microstructure/mechanical properties分类
矿业与冶金引用本文复制引用
姚宗湘,李东,王刚,尹立孟,唐丽,张圆..X80管线钢热丝TIG焊接接头显微组织和力学性能[J].电焊机,2017,47(8):15-18,4.基金项目
国家自然科学基金面上项目(51674056) （51674056）
重庆市前沿与应用基础研究项目(cstc2015jcyjA50017) （cstc2015jcyjA50017）
重庆市教委项目(KJ1713344) （KJ1713344）
材料腐蚀与防护四川省重点实验室开放课题(2016CL15) （2016CL15）
重庆科技学院科研启动基金(CK2016208) （CK2016208）
重庆市高校创新团队建设计划资助项目(CXTDX201601032) （CXTDX201601032）
