异种钢管子对接焊热处理前后残余应力的数值模拟  

Numerical simulation of residual stress before and after post-weld heat treatment in butt-welded pipes with dissimilar steel

作　　者：樊睿智[1] 刘俊龑[1] 陆皓[1] 张茂龙[2] 钱旭辉[2] 胡永强 

机构地区：[1]上海交通大学材料科学与工程学院,200030 [2]上海锅炉厂有限公司,200245 [3]上海沪东造船集团有限公司,201200

出　　处：《焊接》2007年第5期54-57,共4页Welding & Joining

基　　金：国家自然科学基金(50475021)

摘　　要：采用热-粘弹塑性有限元模型,在考虑蠕变效应的基础上,对同种及异种钢管子环焊缝焊接及焊后热处理过程进行了数值模拟。计算结果表明,经过热处理过程后,管子焊接接头的残余应力有显著的降低,约为初始状态的1/3。在热处理后期,两种接头的残余应力均出现了一定程度的回升现象。基于在相同的计算条件下,异种钢焊接接头残余应力要高于同种钢。同时,比较了过渡层对接头残余应力的影响,发现过渡层宽度对于降低异种钢焊接接头残余应力水平有重要影响。Based on the creep behavior with thermal viscoplasticity analysis,a computational procedure was presented for analyzing temperature fields and residual stress states in multi-pass welds and post-weld heat treatment in steel pipes with similar and dissimilar welded joint.The simulated results show that the creep behavior plays a great role in decreasing welding residual stress which can only be 1/3 as much as inital residuel stress after heat treatment.In the latter part of heat treatment,the residual stress of the two joints appears a certain degree of bouncing back.In the same computational condition,the residual stress of dissimilar welded joint is much higher than that of the similar welded joint,so the numerical comparison of transition layer has been raised to offer a better solution.

关 键 词：数值模拟 蠕变 残余应力 多道焊 

分 类 号：TG404[金属学及工艺—焊接]