Solid-State Transformation of an Additive Manufactured Inconel 625 Alloy at 700 °C

Zhang, Fan; Ilavsky, Jan; Lindwall, Greta; Stoudt, Mark R.; Levine, Lyle E.; Allen, Andrew J.

doi:10.3390/app11188643

Title: Solid-State Transformation of an Additive Manufactured Inconel 625 Alloy at 700 °C

Journal Article · 17 September 2021 · Applied Sciences

DOI: https://doi.org/10.3390/app11188643 · OSTI ID:1833637

Zhang, Fan ^[1];

^[2]; Lindwall, Greta ^[3]; Stoudt, Mark R. ^[1]; Levine, Lyle E. ^[1];

^[1]

National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Material Measurement Lab.
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
KTH Royal Inst. of Technology, Stockholm (Sweden)

Inconel 625, a nickel-based superalloy, has drawn much attention in the emerging field of additive manufacturing (AM) because of its excellent weldability and resistance to hot cracking. The extreme processing condition of AM often introduces enormous residual stress (hundreds of MPa to GPa) in the as-fabricated parts, which requires stress-relief heat treatment to remove or reduce the internal stresses. Typical residual stress heat treatment for AM Inconel 625, conducted at 800 °C or 870 °C, introduces a substantial precipitation of the δ phase, a deleterious intermetallic phase. In this work, we used synchrotron-based in situ scattering and diffraction methods and ex situ electron microscopy to investigate the solid-state transformation of an AM Inconel 625 at 700 °C. Our results show that while the δ phase still precipitates from the matrix at this temperature, its precipitation rate and size at a given time are both smaller when compared with their counterparts during typical heat treatment temperatures of 800 °C and 870 °C. A comparison with thermodynamic modeling predictions elucidates these experimental findings. Our work provides the rigorous microstructural kinetics data required to explore the feasibility of a promising lower-temperature stress-relief heat treatment for AM Inconel 625. The combined methodology is readily extendable to investigate the solid-state transformation of other AM alloys.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1833637

Journal Information:: Applied Sciences, Journal Name: Applied Sciences Journal Issue: 18 Vol. 11; ISSN 2076-3417

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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Title: Solid-State Transformation of an Additive Manufactured Inconel 625 Alloy at 700 °C

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