Study on the microstructure and hardness of in-service welded joint of X70 pipeline steel

被引：2
|
作者：
陈玉华 [1 ]
王勇 [2 ]
刘鸽平 [1 ]
机构：
[1] School of Material Science and Engineering,Nanchang Hangkong University
[2] College of Mechanical and Electronic Engineering,China University of Petroleum
来源：
China Welding | 2007年 / 04期
关键词：
in-service welding; X70 pipeline steel; microstructure; hardness;
D O I：
暂无
中图分类号：
TG407 [焊接接头的力学性能及其强度计算];
学科分类号：
摘要：
Hydrogen induced cracking(HIC) is one of the main problems of in-service welding onto active pipeline.Microstructure and hardness of welded joint have a vital effect on hydrogen induced cracking.The microstructure and hardness of welded joint of X70 pipeline steel were studied using simulation in-service welding device.The results show that the main microstructures of in-service welded seam are grain boundary ferrite,intracrystalline acicular ferrite,as well as small amount of widmanstatten structure.The main microstructures of coarse grain heat-affected zone(CGHAZ) are coarse granular bainite,lath ferrite and martensite.Metastable phases such as martensite and lath ferrite are found in CGHAZ because of the too quick cooling velocity and the hardness of the CGHAZ is high.
引用
收藏
页码：68 / 71
页数：4
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