Simulation research on the temperature field in metal laser additive manufacturing process
To study the temperature field characteristics of the metal laser additive manufacturing process and achieve the accurate prediction and control of the temperature field,geometric models,material models,heat source models,boundary conditions,and secondary development algorithms involved in laser additive process simulation were studied and selected.The influence of laser scanning speed on the temperature field of the molten pool in the single-layer and single-pass laser melting process was analyzed,and the distribution characteristics of the molten pool temperature field in the multi-layer and multi-pass additive manufacturing process were further obtained,providing a theoretical basis for accurately predicting the characteristics of the laser molten pool and temperature field in the additive manufacturing process.The results show that the morphology characteristics of the laser melt pool in additive manufacturing process exhibit asymmetric distribution,and the degree of asymmetry of the melt pool morphology in the real-time additive region is more severe than that in the already additive region;The temperature field in the solidified area within or between layers affects the temperature distribution of the real-time laser melt pool area;The real-time temperature field of the laser melt pool can also affect the temperature field distribution and temperature gradient in the solidified area,causing temperature accumulation in the solidified part of the material and resulting in remelting and solid phase transition.
万方数据
