Thermal Aging and the Hall–Petch Relationship of PM-HIP and Wrought Alloy 625

Elizabeth Getto, Brian Tobie, Esteban Bautista, Alexander L. Bullens, Zachary T. Kroll, Michael J. Pavel, Keyou S. Mao, David W. Gandy, Janelle P. Wharry

Research output: Contribution to journalArticlepeer-review

Abstract

Powder metallurgy with hot isostatic pressing (PM-HIP) is an advanced alloy processing method capable of fabricating complex nuclear reactor components near-net shape, reducing the need for machining and welding. For heat exchangers and steam generators, thermal aging of PM-HIP materials must be comparable or superior to conventional castings or forgings. This study compares thermal aging effects in PM-HIP and wrought alloy 625. Isothermal aging is carried out over 400–800°C for 100 h. Both PM-HIP and wrought materials have equiaxed grains with a uniform orientation distribution. The PM-HIP material has finer grains than the wrought material at all aging conditions. Both PM-HIP and wrought materials have a comparable hardness and modulus measured by nanoindentation. Hardness remains unchanged with aging except the wrought material aged at 800°C, which exhibits softening. Overall, PM-HIP alloy 625 responds comparably to wrought alloy 625 and is superior at 800°C. Results are used to calculate a Hall–Petch coefficient.

Original languageEnglish (US)
Pages (from-to)2837-2845
Number of pages9
JournalJOM
Volume71
Issue number8
DOIs
StatePublished - Aug 15 2019
Externally publishedYes

ASJC Scopus subject areas

  • General Materials Science
  • General Engineering

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