TY - JOUR
T1 - Influence of process parameters on heat transfer of molten pool for selective laser melting
AU - Siao, Yong Hao
AU - Wen, Chang Da
N1 - Funding Information:
The author is grateful for the financial support of the Ministry of Science and Technology , Taiwan, through the project: MOST 107-2218-E-006-007. The technical assistance and the instrument support by Tongtai Machine & Tool Corporation, Taiwan are highly appreciated.
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/6/1
Y1 - 2021/6/1
N2 - The stainless steel 316L metal powder is layered on the substrate and then directly heated by a laser beam on the surface of the powder, forming a molten pool. A three-dimensional numerical model is established to investigate the heat transfer in the molten pool. The influence of the thermal evaporation, Marangoni effect, laser beam radius, and surface tension gradient on the molten pool are discussed based on the dimensions, temperature distribution, and Marangoni number. In this study, the energy density is introduced as the laser condition in the simulation settings. The results indicate that the thermal evaporation effect obviously affects the dimensions of the molten pool. The fluid flow caused by the Marangoni effect results in the molten pool forming into a deep and narrow shape. The dimensions, including the depth and width of the molten pool, are expanded as laser beam radius increases. The large surface tension gradient leads to a high Marangoni number and aspect ratio of the molten pool. The shape and dimension of the molten pool obtained from the experimental micrograph are close to the predictions with a surface tension gradient of 0.45 × 10−3N/m-K.
AB - The stainless steel 316L metal powder is layered on the substrate and then directly heated by a laser beam on the surface of the powder, forming a molten pool. A three-dimensional numerical model is established to investigate the heat transfer in the molten pool. The influence of the thermal evaporation, Marangoni effect, laser beam radius, and surface tension gradient on the molten pool are discussed based on the dimensions, temperature distribution, and Marangoni number. In this study, the energy density is introduced as the laser condition in the simulation settings. The results indicate that the thermal evaporation effect obviously affects the dimensions of the molten pool. The fluid flow caused by the Marangoni effect results in the molten pool forming into a deep and narrow shape. The dimensions, including the depth and width of the molten pool, are expanded as laser beam radius increases. The large surface tension gradient leads to a high Marangoni number and aspect ratio of the molten pool. The shape and dimension of the molten pool obtained from the experimental micrograph are close to the predictions with a surface tension gradient of 0.45 × 10−3N/m-K.
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U2 - 10.1016/j.commatsci.2021.110388
DO - 10.1016/j.commatsci.2021.110388
M3 - Article
AN - SCOPUS:85102238728
VL - 193
JO - Computational Materials Science
JF - Computational Materials Science
SN - 0927-0256
M1 - 110388
ER -