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Open AccessArticle

Fabrication of Crack-Free Nickel-Based Superalloy Considered Non-Weldable during Laser Powder Bed Fusion

Department of Mining and Materials Engineering, McGill University, 3610 University Street, Wong Building, Montreal, QC H3A 0C5, Canada
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Materials 2018, 11(8), 1288; https://doi.org/10.3390/ma11081288
Received: 5 July 2018 / Revised: 22 July 2018 / Accepted: 23 July 2018 / Published: 25 July 2018
(This article belongs to the Special Issue Additive Manufacturing: Alloy Design and Process Innovations)
Crack-free Hastelloy X fabricated through laser powder bed fusion (LPBF) from powder with a standard chemical composition is reported. Electron backscatter diffraction (EBSD) analysis evidenced columnar grains parallel to the building direction. The typical LPBF columnar dendrite microstructure was found to be finer than reported elsewhere. Mo-enriched carbides (~50 nm), presumed to play an important role in the cracking behavior of the alloy, were confirmed along interdendritic regions. Crack-free condition was maintained after heat treatment at 1177 °C for 1 h followed by water quenching, and the resulting microstructure was analyzed. View Full-Text
Keywords: nickel alloys; Hastelloy X alloy; additive manufacturing; microstructure; scanning electron microscopy (SEM); laser powder bed fusion (LPBF) nickel alloys; Hastelloy X alloy; additive manufacturing; microstructure; scanning electron microscopy (SEM); laser powder bed fusion (LPBF)
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MDPI and ACS Style

Sanchez-Mata, O.; Wang, X.; Muñiz-Lerma, J.A.; Attarian Shandiz, M.; Gauvin, R.; Brochu, M. Fabrication of Crack-Free Nickel-Based Superalloy Considered Non-Weldable during Laser Powder Bed Fusion. Materials 2018, 11, 1288.

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