Thermo-mechanical modelling of P91 steel weld microstructure and residual stresses in power plant pipework

2009 International Conference on Sustainable Power Generation and Supply Pub Date : 2009-04-06 DOI:10.1109/SUPERGEN.2009.5348007

A. Yaghi, T. Hyde, A. Becker, W. Sun

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引用次数: 5

Abstract

A circumferentially multi-pass butt-welded P91 steel pipe, typically used for high-temperature applications in power plants, has been numerically analysed to determine residual stresses, induced by the process of welding, as well as microstructural regions in the weld, caused by thermal cycles. The finite element (FE) method has been applied to simulate residual stresses generated in the weld region and heat affected zone (HAZ). The axisymmetric FE simulation incorporates solidstate phase transformation (SSPT) by allowing for volumetric changes in steel and associated changes in yield stress due to austenitic and martensitic transformations. The thermal cycles during welding cause different microstructural regions to emerge in the vicinity of the weld metal. Columnar and equiaxed microstructural zones have been numerically modelled in the weld region of the pipe. The predicted FE microstructural regions have been corroborated by columnar and equiaxed zones that have been mapped out on a cross-sectional macro-image of the weld.

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电厂管道P91钢焊缝显微组织和残余应力的热力学建模

对一种通常用于电厂高温应用的周向多道次对接焊接P91钢管进行了数值分析，以确定由焊接过程引起的残余应力，以及由热循环引起的焊缝中的显微组织区域。采用有限元法对焊接区和热影响区产生的残余应力进行了数值模拟。轴对称有限元模拟结合了固相转变(SSPT)，允许钢的体积变化和相关的屈服应力变化，这是由于奥氏体和马氏体转变。焊接过程中的热循环导致焊缝金属附近出现不同的显微组织区域。对钢管焊缝区柱状和等轴组织区进行了数值模拟。在焊缝的横截面宏观图像上绘制出柱状和等轴状区域，证实了预测的FE显微组织区域。

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2009 International Conference on Sustainable Power Generation and Supply

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