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| Numerical study of influence of substrate temperature on melt pool behavior in laser additive manufacturing |
| Received:July 22, 2024 Revised:August 14, 2024 |
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| DOI：10.7511/jslx20240722003 |
| KeyWord:laser powder bed fusion fluid dynamics melt pool temperature gradient |
| Author | Institution |
| 钱学海 |
华中科技大学 航空航天学院&智能制造装备与技术全国重点实验室, 武汉 |
| 赵吕 |
华中科技大学 航空航天学院&智能制造装备与技术全国重点实验室, 武汉 |
| 李振环 |
华中科技大学 航空航天学院&智能制造装备与技术全国重点实验室, 武汉 |
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| Abstract: |
| 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. |