University of Oulu

T. Rautio, M. Hietala, M. Hirvimäki, J. Mäkikangas, J. Kumpula and A. Järvenpää, "Fatigue Life and Surface Quality of Laser Powder Bed Fusion Manufactured 316L Parts by Laser Heat Treatment," 2022 7th International Conference on Business and Industrial Research (ICBIR), Bangkok, Thailand, 2022, pp. 187-191, doi: 10.1109/ICBIR54589.2022.9786466.

Fatigue life and surface quality of laser powder bed fusion manufactured 316L parts by laser heat treatment

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Author: Rautio, Timo1; Hietala, Mikko1; Hirvimäki, Marika2;
Organizations: 1Kerttu Saalasti Institute, University of Oulu, Nivala, Finland
2Research Group of Laser Material Processing, LUT University, Lappeenranta, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 2.5 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2022
Publish Date: 2023-04-17


Laser heat treatment (LHT) with two sets of energy inputs was applied to laser powder bed fusion (LPBF) manufactured 316L parts and its effects were studied in this research. LHT processed structures were compared to the as built material in terms of microstructural analysis, hardness measurements and mechanical testing, surface roughness and fatigue life. The results show that the LHT can be used to enhance the material properties of LPBF manufactured 316L parts in several ways. With the higher energy density, the surface roughness could be nearly halved while the fatigue strength was simultaneously doubled with no meaningful recorded loss in hardness or ultimate tensile strength. Microstructural evolution at the surface due to the LHT resulted in a mixture of coarse columnar dendrite and cellular grain structure. According to the findings of this work, LHT appears as an attractive tool for enhancing the properties of LBPF 316L.

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ISBN: 978-1-6654-9475-5
DOI: 10.1109/icbir54589.2022.9786466
Host publication: 2022 7th International Conference on Business and Industrial Research (ICBIR)
Conference: International Conference on Business and Industrial Research
Type of Publication: A4 Article in conference proceedings
Field of Science: 216 Materials engineering
222 Other engineering and technologies
Funding: The authors would like to acknowledge the financial support received from the Council of Oulu Region and the European Union (European Regional Development Fund) for the “Hybridi” and M3D projects.
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