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Tensile properties of laser powder bed fusion built JBK-75 austenitic stainless steel
University West, Sweden.
University West, Sweden.
Osaka University, Japan.
Osaka University, Japan.
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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) Published
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
Elsevier Ltd , 2023. Vol. 874, article id 144911
Keywords [en]
Austenitic stainless steel, Design of experiment (DOE), JBK-75, Laser powder bed fusion (PBF-LB), Process parameters, Tensile properties, Anisotropy, Hot isostatic pressing, Porosity, Tensile strength, Tensile testing, Textures, Additive manufacturing process, Conventional manufacturing, Design of experiment, Laser powders, Material wastage, Net-shaping, Powder bed, Design of experiments
National Category
Manufacturing, Surface and Joining Technology
Identifiers
URN: urn:nbn:se:ri:diva-64659DOI: 10.1016/j.msea.2023.144911Scopus ID: 2-s2.0-85153940822OAI: oai:DiVA.org:ri-64659DiVA, id: diva2:1756984
Note

 Funding details: 20201639; Funding details: Japan Society for the Promotion of Science, KAKEN; Funding details: European Regional Development Fund, ERDF; Funding details: Tillväxtverket; Funding text 1: The authors would like to thank Marco Ravanal and James Shipley at Quintus Technologies for performing the HIP treatments. Västra Götalandsregionen through Tillväxtverket (European Regional Development Fund) and GKN Aerospace Sweden AB funded this research project through the Spacelab project (grant number 20201639). The authors would also like to thank the Japan society for the promotion of science (JSPS) summer program for funding. Sukhdeep Singh would like to acknowledge JSPS International Research Fellowship for its support.  Funding text 2: Västra Götalandsregionen through Tillväxtverket ( European Regional Development Fund ) and GKN Aerospace Sweden AB funded this research project through the Spacelab project (grant number 20201639 ). The authors would also like to thank the Japan society for the promotion of science (JSPS ) summer program for funding. Sukhdeep Singh would like to acknowledge JSPS International Research Fellowship for its support. 

Available from: 2023-05-15 Created: 2023-05-15 Last updated: 2024-04-02Bibliographically approved

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Lyphout, Christophe

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