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In this work, the purpose of the current study is to understand the effects of time per layer and part geometry on microcracking behavior as well as thermal history, microstructure, and mechanical properties in Inconel 738 LC samples. A part-scale finite element thermal analysis confirmed that significant heat accumulation occurred during the process in the samples with constricted geometry with short time per layer. In the fabricated IN738LC samples with the heat accumulation, more coarse microstructure, greater hardness, and severe cracking size and density were observed. The cracking mechanism based on the RDG model with Rosenthal’s analytical temperature field suggests that heat accumulation during the L-PBF process should be avoided to fabricate crack-free IN738LC parts, and a sufficiently long time per layer is preferable.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Laser powder bed fusion, Time per layer, Constricted geometry, Thermal analysis, Microcracking, Inconel 738 LC

刊行年月日: 2024-01-18

出版者: Elsevier BV

掲載誌:

• Additive Manufacturing (ISSN: 22148604) p. 103987- 103987

研究助成金:

• Japan Society for the Promotion of Science

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1016/j.addma.2024.103987

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更新時刻: 2024-04-10 16:30:19 +0900

MDRでの公開時刻: 2024-04-10 16:30:19 +0900