The detrimental phase formation in Inconel 718 weld microstructure depends on welding conditions. This study uses the FEM simulation of the welding process to establish the variation of temperature gradient and cooling rate in the weld pool boundary as a function of welding current and speed. The microstructure evolution in the weld pool was established using phase field simulation as a function of temperature gradient and cooling rate variation. Thermal simulations ensured experimental validation of the macro and micro-scale simulations. The elemental segregation in the interdendritic region is analyzed, and a phase map was proposed to identify the safe domain for the welding process. The micro-segregation maps guide the selection of optimum welding process parameters. The current study develops and verifies an ICME framework for welding process optimization.

Inconel 718 焊接微观结构中有害相的形成取决于焊接条件。本研究使用焊接过程的有限元模拟来确定熔池边界的温度梯度和冷却速率随焊接电流和速度的变化。使用相场模拟建立了焊池中的微观结构演变作为温度梯度和冷却速率变化的函数。热模拟确保了宏观和微观尺度模拟的实验验证。分析了枝晶间区域的元素偏析，并提出了相图来识别焊接过程的安全域。微观偏析图指导最佳焊接工艺参数的选择。当前的研究开发并验证了用于焊接工艺优化的 ICME 框架。