Investigation of Influence of Laser Parameters and Powder Porosity on Thermal Characteristics in the Powder Bed of a SLM Process
Investigation of Influence of Laser Parameters and Powder Porosity on Thermal Characteristics in the Powder Bed of a SLM Process
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DOI：
10.7736/kspe.2019.36.8.761
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发表时间：
2019-01-01
影响因子：
--
通讯作者：
Son, Yong
中科院分区：
文献类型：
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作者：
KYU, LEE KWANG;Lee, Ho-Jin;Son, Yong
选择性激光熔化（SLM）过程中光束辐照区附近的传热特性影响了熔化区在沉积过程中的形成。熔池的形成受激光参数和粉末特性的影响很大。本文的目的是通过重复有限元分析（FEAs）研究激光参数和粉末孔隙率对SLM工艺熔池附近热特性的影响。选择功率和扫描速度作为激光参数。假设激光为体积高斯热流模型。粉末材料选用SUS17-4PH，衬底材料选用S45C。这些材料的温度相关热特性用于执行有限元分析。通过与实验结果的比较，预测了合适的热流密度效率。研究了激光参数对熔化区附近温度分布和熔池形成的影响。此外，还讨论了粉末孔隙率对熔化区附近传热特性的影响。
Heat transfer characteristics in the vicinity of irradiated region of the beam of a selective laser melting (SLM) process affect the creation of the melted region during the deposition. The creation of the molten pool is greatly influenced by laser parameters and powder characteristics. The goal of the paper is to investigate the influence of laser parameters and powder porosity on thermal characteristics in the vicinity of the molten pool of the SLM process through repeated finite element analyses (FEAs). The power and the scan speed are chosen as the laser parameters. The laser is assumed to be a volumetric Gaussian heat flux model. Materials of the powder and the substrate are chosen as SUS17-4PH and S45C, respectively. Temperature dependent thermal properties for those material are used to perform the FEA. An appropriate efficiency of the heat flux is predicted by comparing the results of FEAs and those of experiments. The influence of laser parameters on temperature distributions in the vicinity of the melted region and the formation of the molten pool is examined. In addition, the effects of porosity of powders on heat transfer characteristics in the vicinity of the melted region are discussed.