P91管道焊接残余应力数值模拟
Numerical Simulation on Welding Residual Stress of P91 Pipe
代 真1， 郝晓军1， 沈利英2， 刘长福1
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作者单位：（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）
中文关键字： P91管道； 焊接残余应力； 有限元模拟； Ⅳ型裂纹
英文关键字：P91 pipe; welding residual stress; finite element simulation; type Ⅳcracking
中文摘要： 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。
英文摘要：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.