Heat Transfer, Laser Remelting/Premelting Behavior and Metallurgical Bonding During Selective Laser Melting of Metal Powder

다국어 초록 (Multilingual Abstract)

In this study, a three-dimensional finite element analysis (FEA) model is established using user-defined subroutines based oncommercial software ABAQUS to investigate the heat transfer and temperature field distribution during selective laser melting(SLM) additive manufacturing of H13 hot working tool steel powder. The influence of the applied laser volumetric energydensity (VED) on the laser remelting and premelting behaviors during SLM process are quantitatively investigated. And theSLM experiments were carried out to analyze the metallurgical bonding quality. The relationships are explored among theVED, laser remelting/premelting and metallurgical bonding behavior, thereby revealing the formation and regulation mechanismsof metallurgical bonding. The results show that the laser remelting and premelting contribute to improving the lap ratioof molten tracks and promoting the effective metallurgical bonding. The peak temperature of the remolten pool, remeltingand premelting dimensions, remelting and premelting indexes, and lap ratio are positively correlated with the applied VED.
Under the optimized VED of 111.1 J/mm3, there is no obvious defect on the cross-section of SLM-fabricated H13 samples,implying a good metallurgical bonding is obtained. This study could provide theoretical and experimental basis for theregulation and control of metallurgical bonding quality of SLM-fabricated parts, which would become design guidelines.

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