Finite element simulation of welding and residual stresses in a P91 steel pipe incorporating solid-state phase transformation and post-weld heat treatment
Finite element simulation of welding and residual stresses in a P91 steel pipe incorporating solid-state phase transformation and post-weld heat treatment
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DOI：
10.1243/03093247jsa372
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发表时间：
2008-05
期刊：
影响因子：
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通讯作者：
A. Yaghi;T H Hyde;A. Becker;W. Sun
中科院分区：
文献类型：
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作者：
A. Yaghi;T H Hyde;A. Becker;W. Sun
采用有限元法对外径为145 mm、壁厚为50 mm的轴对称50焊头环向对接焊P91钢管焊缝区和热影响区产生的残余轴向和环向应力进行了数值模拟。有限元模拟包括热分析和顺序耦合结构分析。固态相变（SSPT）是P91钢在焊接热循环过程中的特征，通过考虑钢的体积变化和相关的屈服应力变化（由于奥氏体和马氏体转变），在有限元分析中进行了建模。相变塑性也被考虑在内。研究了焊后热处理（PWHT）的影响，包括热处理保温时间的影响。残余轴向和环向应力已通过管壁厚度以及沿管道的外表面描绘。结果表明，在P91钢焊接残余应力模拟中加入SSPT的重要性，以及PWHT对应力松弛的影响。
The finite element (FE) method has been applied to simulate residual axial and hoop stresses generated in the weld region and heat-affected zone of an axisymmetric 50-bead circumferentially butt-welded P91 steel pipe, with an outer diameter of 145 mm and wall thickness of 50 mm. The FE simulation consists of a thermal analysis and a sequentially coupled structural analysis. Solid-state phase transformation (SSPT), which is characteristic of P91 steel during welding thermal cycles, has been modelled in the FE analysis by allowing for volumetric changes in steel and associated changes in yield stress due to austenitic and martensitic transformations. Phase transformation plasticity has also been taken into account. The effects of post-weld heat treatment (PWHT) have been investigated, including those of heat treatment holding time. Residual axial and hoop stresses have been depicted through the pipe wall thickness as well as along the outer surface of the pipe. The results indicate the importance of including SSPT in the simulation of residual stresses during the welding of P91 steel as well as the significance of PWHT on stress relaxation.