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

Fan Zhang, Jan Ilavsky

2021eninconeladditive manufacturingheat treatmentmaterials sciencesuperalloy

Abstract

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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 is significantly reduced compared to higher temperatures, suggesting that 700 ◦C may be a viable alternative for stress-relief heat treatment in order to minimize the detrimental effects of excessive δ phase formation.

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Cite This Work

@article{53579f81-98e2-47f1-87e2-55364066c380,
  title={Solid-State Transformation of an Additive Manufactured Inconel 625 Alloy at 700 ◦C},
  author={Fan Zhang and Jan Ilavsky},
  year={2021},
  language={en}
}
TY  - JOUR
TI  - Solid-State Transformation of an Additive Manufactured Inconel 625 Alloy at 700 ◦C
AU  - Fan Zhang
AU  - Jan Ilavsky
PY  - 2021
LA  - en
ER  -

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