A defect-resistant Co–Ni superalloy for 3D printing

Sean P. Murray, Kira M. Pusch, Andrew T. Polonsky, Chris J. Torbet, Gareth G. E. Seward, Ning Zhou, Stéphane A. J. Forsik, Peeyush Nandwana, Michael M. Kirka, Ryan R. Dehoff, William E. Slye and Tresa M. Pollock ()
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Sean P. Murray: University of California Santa Barbara
Kira M. Pusch: University of California Santa Barbara
Andrew T. Polonsky: University of California Santa Barbara
Chris J. Torbet: University of California Santa Barbara
Gareth G. E. Seward: University of California Santa Barbara
Ning Zhou: Carpenter Technology Corp.
Stéphane A. J. Forsik: Carpenter Technology Corp.
Peeyush Nandwana: Oak Ridge National Laboratory
Michael M. Kirka: Oak Ridge National Laboratory
Ryan R. Dehoff: Oak Ridge National Laboratory
William E. Slye: Carpenter Technology Corp.
Tresa M. Pollock: University of California Santa Barbara

Nature Communications, 2020, vol. 11, issue 1, 1-11

Abstract: Abstract Additive manufacturing promises a major transformation of the production of high economic value metallic materials, enabling innovative, geometrically complex designs with minimal material waste. The overarching challenge is to design alloys that are compatible with the unique additive processing conditions while maintaining material properties sufficient for the challenging environments encountered in energy, space, and nuclear applications. Here we describe a class of high strength, defect-resistant 3D printable superalloys containing approximately equal parts of Co and Ni along with Al, Cr, Ta and W that possess strengths in excess of 1.1 GPa in as-printed and post-processed forms and tensile ductilities of greater than 13% at room temperature. These alloys are amenable to crack-free 3D printing via electron beam melting (EBM) with preheat as well as selective laser melting (SLM) with limited preheat. Alloy design principles are described along with the structure and properties of EBM and SLM CoNi-base materials.

Date: 2020
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DOI: 10.1038/s41467-020-18775-0

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