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Article

Hydrogen Effects in Equiatomic CrFeNiMn Alloy Fabricated by Laser Powder Bed Fusion

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Department of Chemistry and Materials Science, Aalto University School of Chemical Engineering, P.O. Box 16100, FI-00076 Espoo, Finland
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Department of Mechanical Engineering, Aalto University School of Engineering, P.O. Box 11000, FI-00076 Espoo, Finland
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Department of Physics, University of Helsinki, P.O. Box 43, FI-00014 Helsinki, Finland
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Department of Industrial and Mechanical Engineering, Tallinn University of Technology, 19086 Tallinn, Estonia
*
Author to whom correspondence should be addressed.
Academic Editors: Jae-Wung Bae and Jongun Moon
Metals 2021, 11(6), 872; https://doi.org/10.3390/met11060872
Received: 27 April 2021 / Revised: 21 May 2021 / Accepted: 25 May 2021 / Published: 27 May 2021
(This article belongs to the Special Issue High-Entropy Alloys for Extreme Environments)
This study investigates the effects of laser powder bed fusion (LPBF) on the hydrogen uptake of the face-centered cubic (FCC) equiatomic CrFeNiMn multicomponent alloy after cathodic hydrogen charging (HC). Hydrogen desorption was evaluated using thermal desorption spectroscopy (TDS), and microstructural changes after the TDS test were examined. Results reveal that the amount of hydrogen absorbed by LPBF CrFeNiMn alloy was significantly higher than that in pulsed electric current sintered (PECS) CrFeNiMn alloy or in conventional 316L austenitic stainless steel. The observations are ascribed to the differences in the amount of hydrogen absorbed by the multicomponent lattice, dislocation densities, width of segregation range at cell walls created by the rapid cooling in LBPF, and vacancies remaining after cooling to room temperature. A hydrogen-charged LBPF transmission electron microscope (TEM) specimen was also characterized. Stacking faults and cracks along the (111)-planes of austenite were observed. Scanning electron microscopy (SEM) of the surface of the TDS-tested samples also indicated hydrogen-induced cracks and hydrogen-induced submicron pits at the grain boundary inclusions. View Full-Text
Keywords: high-entropy alloys; laser powder bed fusion; selective laser melting; thermal desorption spectroscopy; hydrogen charging high-entropy alloys; laser powder bed fusion; selective laser melting; thermal desorption spectroscopy; hydrogen charging
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MDPI and ACS Style

Yang, X.; Yagodzinskyy, Y.; Ge, Y.; Lu, E.; Lehtonen, J.; Kollo, L.; Hannula, S.-P. Hydrogen Effects in Equiatomic CrFeNiMn Alloy Fabricated by Laser Powder Bed Fusion. Metals 2021, 11, 872. https://doi.org/10.3390/met11060872

AMA Style

Yang X, Yagodzinskyy Y, Ge Y, Lu E, Lehtonen J, Kollo L, Hannula S-P. Hydrogen Effects in Equiatomic CrFeNiMn Alloy Fabricated by Laser Powder Bed Fusion. Metals. 2021; 11(6):872. https://doi.org/10.3390/met11060872

Chicago/Turabian Style

Yang, Xuan, Yuriy Yagodzinskyy, Yanling Ge, Eryang Lu, Joonas Lehtonen, Lauri Kollo, and Simo-Pekka Hannula. 2021. "Hydrogen Effects in Equiatomic CrFeNiMn Alloy Fabricated by Laser Powder Bed Fusion" Metals 11, no. 6: 872. https://doi.org/10.3390/met11060872

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