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Global-to-local simulation of the thermal history in the laser powder bed fusion process based on a multiscale finite element approach

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Abstract

Laser powder bed fusion (LPBF) is a well-studied additive manufacturing (AM) process that is currently employed in most industries. LPBF manufactured parts tend to be larger, and trial errors are very costly when production fails. Simulation tools enable the anticipation of distortion issues from residual stress formation. These distortions and other defects generated during the LPBF process have thermal origins, and a thorough thermal history simulation is required before any mechanical or metallurgical simulations. The parameters influencing the thermal fields are applied at different spatial and temporal ranges, making it difficult to simulate the entire process with a unique finite element (FE) time-space mesh. The objective of the method presented in this study is to consider every identified parameter with an impact on the thermal field during the process. This approach is a sequential multiscale FE analysis from the macroscale to any specific microscale region. This approach is based on a specific definition of the temporal and spatial domains defined from the mentioned parameters. A case study was performed to highlight the method: progressive zooming was performed to estimate the thermal fields at five different scales, down to the microscale, that is, near a melt pool. Using this approach, specific regions were selected and zoomed down based on the peak temperatures. Simplifying hypotheses were methodically introduced, and both initial and boundary conditions were defined from the results of the previous levels. The computing durations for this specific part were approximately 14 h, and ways of improving the durations were discussed.

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Data Availability

The data supporting the findings of this study are available from the corresponding author upon reasonable request.

Code Availability

The code used in Abaqus with specific scripts is not provided (laboratory property).

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Funding

Partial financial support was received from the Halbronn Company (salary of the PhD, CIFRE, and financial contract with the laboratory, with funding from the French funding agency ANRT).

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Y. Bresson: Software, Methodology, Writing (Original draft preparation). A. Tongne: Methodology, Writing (Reviewing and Editing). M. Baili: Methodology, Writing (Reviewing and Editing). L. Arnaud: Supervision, Methodology, Writing (Reviewing and Editing).

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Correspondence to Yves Bresson.

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Bresson, Y., Tongne, A., Baili, M. et al. Global-to-local simulation of the thermal history in the laser powder bed fusion process based on a multiscale finite element approach. Int J Adv Manuf Technol 127, 4727–4744 (2023). https://doi.org/10.1007/s00170-023-11427-9

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