Numerical study of influence of substrate temperature on melt pool behavior in laser additive manufacturing
Laser powder bed fusion(LPBF)additive manufacturing offers notable potentials for fabrication of complex structures in the aerospace and biomedical fields due to its capabilities of free-form fabrication and rapid manufacturing.However,LPBF involves extremely high heating and cooling rates as well as strong temperature gradients,inevitably leading to the generation of thermal stresses and residual stresses within the components.These stresses can severely compromise the mechanical properties of the components.Therefore,selecting appropriate parameters to reduce the magnitude and gradient of temperature during the LPBF process is of paramount importance for enhancing the quality of the printed parts.In this paper,a computational fluid dynamics model was used to assess the effects of substrate temperature on the dynamic behavior and temperature field within the melt pool.The model utilizes the volume-of-fluid technique to track powder shape changes,and incorporates recoil pressure and Marangoni effects.The results show that the temperature gradient is notably higher at the melt pool border compared to the melt pool interior,and increasing substrate temperature can effectively reduce temperature gradient.
laser powder bed fusionfluid dynamicsmelt pooltemperature gradient
万方数据
维普
