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首页> 外文期刊>Proceedings of the institution of mechanical engineers >Combined finite element and phase field method for simulation of austenite grain growth in the heat-affected zone of a martensitic steel weld
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Combined finite element and phase field method for simulation of austenite grain growth in the heat-affected zone of a martensitic steel weld

机译：有限元和相场相结合的方法模拟马氏体钢焊缝热影响区奥氏体晶粒长大

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摘要

Engineering components operating at high temperature often fail due to the initiation and growth of cracks in the heat-affected zone adjacent to a weld. Understanding the effects of microstructural evolution in the heat-affected zone is important in order to predict and control the final properties of welded joints. This study presents a combined finite element method and phase field method for simulation of austenite grain growth in the heat-affected zone of a tempered martensite (P91) steel weld. The finite element method is used to determine the thermal history of the heat-affected zone during gas tungsten arc welding of a P91 steel plate. Then, the calculated thermal history is included in a phase field model to simulate grain growth at various positions in the heat-affected zone. The predicted mean grain size and grain distribution match well with experimental data for simulated welds from the literature. The work lays the foundation for optimising the process parameters in welding of P91 and other ferritic/martensitic steels in order to control the final heat-affected zone microstructure.
机译：在高温下工作的工程部件通常会由于邻近焊缝的热影响区中裂纹的产生和扩展而失效。为了预测和控制焊接接头的最终性能，了解热影响区的微观结构演变的影响很重要。本研究提出了一种结合有限元方法和相场方法来模拟回火马氏体（P91）钢焊缝热影响区中奥氏体晶粒长大的方法。有限元方法用于确定P91钢板的钨极氩弧焊过程中热影响区的热历史。然后，将计算出的热历史记录包括在相场模型中，以模拟热影响区中各个位置的晶粒生长。预测的平均晶粒尺寸和晶粒分布与文献中模拟焊缝的实验数据非常吻合。这项工作为优化P91和其他铁素体/马氏体钢的焊接工艺参数奠定了基础，以控制最终的热影响区组织。

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