管线钢焊接局部脆化区断裂行为的研究  

Fracture Behaviors of Local Brittle Zone in Pipeline Steel

作　　者：高惠临[1] 董玉华[2] 余大涛[1] 

机构地区：[1]西安石油学院机械工程系,陕西西安710065 [2]西安交通大学材料科学与工程学院,陕西西安710049

出　　处：《机械工程材料》2001年第7期26-29,共4页Materials For Mechanical Engineering

基　　金：中国石油天然气集团公司石油管力学和环境行为重点实验室基金资助 (ZYT 0 0 0 4)

摘　　要：用缺口拉伸和冲击试验 ,研究了管线钢多道焊的临界粗晶热影响区的断裂行为。观察结果表明 :管线钢在断裂过程中 ,存在夹杂物形核、铁素体与M A组元界面形核和M A组元内部形核三种方式。奥氏体晶界、贝氏体板条束界可改变裂纹扩展方向 ,M A组元对裂纹扩展没有阻止作用。在试验观察的基础上 。Using notched round test and Cherpy impact test, the fracture behaviors of intercritically reheated coarse grained HAZ (IRCGHAZ) of pipeline steel during multi pass welding are observed by means of SEM. The experimental results show that there are crack initiation occurs during the process of fracture at three sites i. e. at MnS inclusion, at interface between ferrite and M A constituent and inside M A constituent. It can be found that the propagation direction of crack can be changed by austenite grain boundaries, as well as lath bainite boundaries. M A constituent cant prevent crack propagation. On the basis of experimental observation, the fracture mode of IRCGHAZ of experimental steel is described.

关 键 词：管线钢 HAZ 断裂 IRCGHAZ 油管 原油 

分 类 号：TE973.3[石油与天然气工程—石油机械设备] TG457.11[金属学及工艺—焊接]