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首页> 外文期刊>Welding in the World: Journal of the International Institute of Welding: Journal of the International Institute of Welding >NUMERICAL INVESTIGATIONS ON THE RESIDUAL STRESS FIELD IN A CLADDED PLATE DUE TO THE CLADDING PROCESS
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NUMERICAL INVESTIGATIONS ON THE RESIDUAL STRESS FIELD IN A CLADDED PLATE DUE TO THE CLADDING PROCESS

机译：熔覆过程中覆层板残余应力场的数值研究

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摘要

The inner surface of reactor pressure vessels is protected against corrosion by an austenitic cladding. Generally, the cladding is welded on the ferritic base metal with two layers to avoid cracks under the cladding and to improve the microstructure of the cladding material. On the other hand, due to the cladding process and the difference of the thermal expansion coefficient of the austenitic cladding and the ferritic base material, residual stresses are acting over the wall thickness. This residual stress field is important for the integrity assessment of the component. For the determination of the residual stress field, plates of a reactor pressure vessel steel were cladded by submerged arc welding and heat treated, representative of the real component. The numerical simulation was performed with the finite element code SYSWELD. The heat source of the model representing the welding process was calibrated against the temperature profiles measured during welding. In the analysis, the temperature-dependent material properties, as well as the transformation behaviour of the ferritic base metal, were taken into account. The calculated residual stresses show tensile stresses in the cladding followed by compressive stresses in the base metal that are in agreement with measurements with X-ray diffraction technique. After post-weld heat treatment the residual stresses in the ferritic base metal are reduced significantly.
机译：反应堆压力容器的内表面受到奥氏体熔覆层的腐蚀保护。通常，将包层焊接在两层铁素体基体金属上，以避免包层下方的裂纹，并改善包层材料的微观结构。另一方面，由于包层工艺以及奥氏体包层和铁素体母材的热膨胀系数的差异，残余应力作用在壁厚上。该残余应力场对于组件的完整性评估很重要。为了确定残余应力场，将反应堆压力容器钢的板通过埋弧焊进行了包覆，并进行了热处理（代表真实成分）。使用有限元代码SYSWELD进行了数值模拟。代表焊接过程的模型的热源已根据焊接过程中测得的温度曲线进行了校准。在分析中，考虑了取决于温度的材料特性以及铁素体母材的转变行为。计算得出的残余应力显示出覆层中的拉应力，然后是母材中的压应力，这与X射线衍射技术的测量结果一致。焊后热处理后，铁素体母材中的残余应力显着降低。

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