P91管道焊接残余应力数值模拟  

Numerical Simulation on Welding Residual Stress of P91 Pipe

作　　者：代真[1] 郝晓军[1] 沈利英[2] 刘长福[1] 

机构地区：[1]河北省电力研究院,河北石家庄050021 [2]扬子石化-巴斯夫有限责任公司,江苏南京210048

出　　处：《热加工工艺》2010年第21期164-166,共3页Hot Working Technology

摘　　要：Cr-Mo耐热钢最常见的问题是发生于焊接接头热影响区的Ⅳ型裂纹引起的失效,焊接残余应力水平起着重要的作用。本文基于大型有限元软件ABAQUS,开发了一个顺次耦合的焊接应力计算程序,对P91钢焊接接头的残余应力场进行了模拟。研究结果表明:轴向和径向残余应力均呈拉应力状态;焊接残余应力最大值集中在靠近母材的热影响区附近,并且焊接残余应力集中部位与Ⅳ型裂纹的发生位置相一致。The universal problem of Cr-Mo heat-resistant steel is type Ⅳcracking failure in heat affected zone（HAZ） of welded joint.The level of welding residual stress plays a remarkable role.A coupling calculation method for welding stress was developed by ABAQUS code.The residual stress for welded joint of P91 steel was simulated by the method above.The results show that the radial and axial residual stress are tensile stress.The maximal residual stress concentrates in the vicinity of HAZ adjacent to base metal.The position of welding resichual stress is in good agreement with the generation position of type Ⅳ cracking.

关 键 词：P91管道 焊接残余应力 有限元模拟 Ⅳ型裂纹 

分 类 号：TG404[金属学及工艺—焊接]