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首页> 外文期刊>Proceedings of the institution of mechanical engineers >Three-dimensional finite element modelling of welding residual stresses of medium carbon steel pipes with consideration of solid-state austenite-martensite transformation and post-weld heat treatment
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Three-dimensional finite element modelling of welding residual stresses of medium carbon steel pipes with consideration of solid-state austenite-martensite transformation and post-weld heat treatment

机译：考虑固态奥氏体-马氏体相变和焊后热处理的中碳钢管焊接残余应力三维有限元建模

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摘要

In the present work, three-dimensional finite element modelling is presented to simulate welding of the medium carbon steel pipes by considering both the solid-state austenite-martensite transformation and the post-weld heat treatment. Thermo-elasto-plastic and metallurgical analyses are carried out by developing two user-defined subroutines: one for applying the heat flux and the another one for considering phase transformation effects on welding residual stresses. The applied heat flux is simulated by a double ellipsoid model. Furthermore, the effects of volumetric change due to the solid-state austenite-martensite transformation are taken into account. The results obtained have revealed that volumetric change owing to the solid-state austenite-martensite transformation has a significant effect on the magnitude and distribution of welding residual stresses. The main contribution of the present work is providing helpful knowledge about welding residual stresses evolution after and before the post-weld heat treatment by considering the solid-state austenite-martensite transformation. In addition to reference to the time-temperature-transformation diagram, this study can result in safe selection of post-weld heat treatment parameters, which not only prevents sensitization to stress corrosion cracking and intergranular corrosion but also provides enough and more importantly controlled relaxation of welding residual stresses.
机译：在目前的工作中，提出了三维有限元建模，通过考虑固态奥氏体-马氏体相变和焊后热处理来模拟中碳钢管的焊接。通过开发两个用户定义的子程序来进行热弹塑性和冶金分析：一个子程序用于施加热通量，另一个子程序考虑相变对焊接残余应力的影响。所施加的热通量通过双椭球模型进行模拟。此外，考虑了由于固态奥氏体-马氏体相变引起的体积变化的影响。所得结果表明，固态奥氏体-马氏体相变引起的体积变化对焊接残余应力的大小和分布有重要影响。本工作的主要贡献是，通过考虑固态奥氏体-马氏体相变，为焊接后热处理前后的焊接残余应力演变提供了有用的知识。除了参考时间-温度变换图之外，该研究还可以安全地选择焊后热处理参数，这不仅可以防止对应力腐蚀开裂和晶间腐蚀的敏感性，而且还可以提供足够的，更重要的是可控制的松弛率。焊接残余应力。

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