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Tensile properties of laser powder bed fusion built JBK-75 austenitic stainless steel
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (KAMPT)ORCID iD: 0000-0003-3772-4371
University West, Department of Engineering Science.
Joining and Welding Research Institute, Osaka University, Osaka (JPN).
Joining and Welding Research Institute, Osaka University, Osaka (JPN).
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2023 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 874, article id 144911Article in journal (Refereed) Epub ahead of print
Abstract [en]

Laser powder bed fusion (PBF-LB) is an additive manufacturing (AM) process that has several advantages to conventional manufacturing, such as near net-shaping capabilities and reduced material wastage. To be able to manufacture a novel material, however, one needs to first optimize the process parameters, to decrease porosity content as low as possible. Therefore, in this work the process parameters of PBF-LB built JBK-75 austenitic stainless steel, and its influence on porosity, microstructure, and hardness have been investigated. The least amount of porosity was found by using 132 W laser power, 750 mm/s scan speed, layer thickness 30 μm, and 0.12 mm hatch distance. These process parameters were then used to manufacture material for tensile testing, to investigate the tensile properties of PBF-LB built JBK-75 and potential anisotropic behavior. Hot isostatic pressing (HIP) was also performed in two sets of samples, to investigate the effect of pore closure on the tensile properties. The ultimate tensile strength (UTS) for the un-HIPed specimens was 1180 (horizontally built) and 1110 (vertically built) MPa. For the HIPed specimens, it was 1160 (horizontally built) and 1100 (vertically built) MPa. The anisotropic presence was explained by the presence of texture, with a multiple of random distribution (MRD) up to 4.34 for the {001} planes, and defects.

Place, publisher, year, edition, pages
2023. Vol. 874, article id 144911
Keywords [en]
Austenitic stainless steel, Process parameters, Laser powder bed fusion (PBF-LB), JBK-75, Design of experiment (DOE), Tensile properties
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-20015DOI: 10.1016/j.msea.2023.144911ISI: 001029577000001Scopus ID: 2-s2.0-85153940822OAI: oai:DiVA.org:hv-20015DiVA, id: diva2:1762011
Funder
Region Västra Götaland, 20201639Swedish Agency for Economic and Regional Growth, 20201639
Note

Västra Götalandsregionen through Tillväxtverket (European Regional Development Fund) and GKN Aerospace Sweden AB funded this research project through the Spacelab project (grant number 20201639). 

Available from: 2023-06-02 Created: 2023-06-02 Last updated: 2024-01-15Bibliographically approved

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Neikter, MagnusPederson, Robert

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Neikter, MagnusLyphout, ChristophePederson, Robert
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