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Effect of Post Processing Heat Treatment Routes on Microstructure and Mechanical Property Evolution of Haynes 282 Ni-Based Superalloy Fabricated with Selective Laser Melting (SLM)

J. B. Speed School of Engineering, University of Louisville, Louisville, KY 40292, USA
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Metals 2020, 10(5), 629; https://doi.org/10.3390/met10050629
Received: 4 April 2020 / Revised: 8 May 2020 / Accepted: 10 May 2020 / Published: 12 May 2020
Selective laser melting (SLM) is one of the most widely used additive manufacturing technologies. Fabricating nickel-based superalloys with SLM has garnered significant interest from the industry and the research community alike due to the excellent high temperature properties and thermal stability exhibited by the alloys. Haynes-282 alloy, a γ′-phase strengthened Ni-based superalloy, has shown good high temperature mechanical properties comparable to alloys like R-41, Waspaloy, and 263 alloy but with better fabricability. A study and comparison of the effect of different heat-treatment routes on microstructure and mechanical property evolution of Haynes-282 fabricated with SLM is lacking in the literature. Hence, in this manuscript, a thorough investigation of microstructure and mechanical properties after a three-step heat treatment and hot isostatic pressing (HIP) has been conducted. In-situ heat-treatment experiments were conducted in a transmission electron microscopy (TEM) to study γ′ precipitate evolution. γ′ precipitation was found to start at 950 °C during in-situ heat-treatment. Insights from the in-situ heat-treatment were used to decide the aging heat-treatment for the alloy. The three-step heat-treatment was found to increase yield strength (YS) and ultimate tensile strength (UTS). HIP process enabled γ′ precipitation and recrystallization of grains of the as-printed samples in one single step. View Full-Text
Keywords: additive manufacturing; selective laser melting; SLM; nickel based superalloys; Haynes 282; powder bed fusion; Ni alloy; heat-treatment; microstructure; mechanical property additive manufacturing; selective laser melting; SLM; nickel based superalloys; Haynes 282; powder bed fusion; Ni alloy; heat-treatment; microstructure; mechanical property
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Deshpande, A.; Deb Nath, S.; Atre, S.; Hsu, K. Effect of Post Processing Heat Treatment Routes on Microstructure and Mechanical Property Evolution of Haynes 282 Ni-Based Superalloy Fabricated with Selective Laser Melting (SLM). Metals 2020, 10, 629.

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