X100管线钢焊接接头的显微组织和性能  

Microstructure and Property of X100Pipeline Steel Welded Joint

作　　者：李继红[1] 杨亮[1] 张敏[1] 

机构地区：[1]西安理工大学材料科学与工程学院,西安710048

出　　处：《机械工程材料》2014年第2期59-62,共4页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(51274162);陕西省自然科学基金资助项目(2012JM6003);西安市科技计划项目(CX1250②)

摘　　要：利用光学显微镜、拉伸试验机、冲击试验机及维氏硬度计等对X100管线钢埋弧焊焊接接头的组织及性能进行了研究。结果表明:X100管线钢焊接接头粗晶区组织为粗大的先共析铁素体和粒状贝氏体,细晶区主要为细小的铁素体,不完全重结晶区为细晶铁素体、粗晶针状铁素体和粒状贝氏体混合组织;接头的抗拉强度平均值为576MPa,达到母材的80%,拉伸试样断裂于焊缝处;接头焊缝、热影响区的冲击功分别为198J和259J;焊缝区最高硬度为316HV,在临界温度热影响区(ICHAZ)和亚临界温度热影响区(SCHAZ)之间存在软化现象。Using optical microscopy, tensile, impact and hardness tests, the microstructure and property of the welded X100 pipeline steel joint were studied. The results show that the microstructure was coarse proeutectoid ferrite and granular bainite in the coarse-grained zone of the joint, fine ferrite in the fine-grained region, and fine- grained ferrite, coarse-grained acicular ferrite and granular bainite in the incomplete recrystallization region. The average tensile strength of the joint was 576 MPa, which got to about 80M of the base materials. The tensile fracture occurred in the welding seam. The impact energy in the welding seam and heat affected zone were 198 J and 259 J, respectively. The maximum hardness value was 316 HV in the weld zone. The phenomenon of softening appeared between the critical heat affected zone （ICHAZ） and the subcritical heat affected zone （SCHAZ）.

关 键 词：X100管线钢 埋弧焊 焊接接头 

分 类 号：TG113[金属学及工艺—物理冶金]