E16-25MoN焊丝熔敷金属高温失塑裂纹敏感性及微观组织分析  

Analysis on High Temperature Ductility-Dip Crack Sensitivity and Microstructure of E16-25MoN Welding Wire Deposited Metal

作　　者：党尚达 李霄[1] 刘刚[2] 刘福广[2] 牛辉[3,4] DANG Shangda;LI Xiao;LIU Gang;LIU Fuguang;NIU Hui(School of Materials Science and Engineering,Xi'an Shiyou University,Xi'an 710065,China;Xi'an Thermal Engineering Research Institute Co.,Ltd.,Xi'an 710054,China;Steel pipe Research Institute,Baoji Petroleum Steel Pipe Co.,Ltd.,Baoji 721008,China;National Petroleum and Natural Gas Pipe Engineering Technology Research Center,Baoji 721008,China)

机构地区：[1]西安石油大学材料科学与工程学院,陕西西安710065 [2]西安热工研究院有限公司,陕西西安710054 [3]宝鸡石油钢管有限责任公司钢管研究院,陕西宝鸡721008 [4]国家石油天然气管材工程技术研究中心,陕西宝鸡721008

出　　处：《热加工工艺》2024年第19期79-82,共4页Hot Working Technology

基　　金：西安石油大学研究生创新与实践能力培养计划资助(YCS20213203)。

摘　　要：采用钨极氩弧焊制备了E16-25MoN焊丝熔敷层,采用Gleeble热模拟试验机对熔敷金属试样进行了不同温度、不同应变量的拉伸试验。结果表明:在850~1150℃内,E16-25MoN焊丝熔敷金属的高温失塑裂纹敏感程度较高,1000℃时敏感程度最高,该温度下裂纹临界应变量变低于6%。通过组织分析发现高温失塑裂纹的产生受晶界平直形貌和晶界析出物的影响,高温时晶界上析出物阻碍位错移动,形成应力集中最终产生开裂,而平直晶界为裂纹扩展提供了有利条件。E16-25MoN welding wire cladding layer was prepared by using argon tungsten arc welding,and the tensile experiments at different temperatures and strains were carried out by using Gleeble thermal simulation machine.The results show that the high temperature ductility-dip crack(DDC)sensitivity of the deposited metal is high in the range of 850-1150℃,and the high temperature DDC sensitivity of the deposited metal is the highest at 1000℃,and the critical strain at cracking at this temperature is lower than 6%.Through the microstructure analysis,it is found that the production of high temperature DDC is affected by the flat morphology of grain boundary and the grain boundary precipitates.At high temperature,the precipitates at the grain boundary hinder the movement of dislocations,resulting in stress concentration and eventually cracking,while the flat grain boundaries provide favorable conditions for crack propagation.

关 键 词：E16-25MoN焊丝 失塑裂纹(DDC) 裂纹敏感性 显微组织 

分 类 号：TG424[金属学及工艺—焊接]