@article{7912127501d44d7f9c6750dc5bb9d23a,
title = "Thermal Aging and the Hall–Petch Relationship of PM-HIP and Wrought Alloy 625",
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.",
author = "Elizabeth Getto and Brian Tobie and Esteban Bautista and Bullens, {Alexander L.} and Kroll, {Zachary T.} and Pavel, {Michael J.} and Mao, {Keyou S.} and Gandy, {David W.} and Wharry, {Janelle P.}",
note = "This work was supported by the U.S. Department of Energy, Office of Nuclear Energy under DOE Idaho Operations Office Contract DE-AC07-051D14517 as part of Nuclear Science User Facilities experiment 15-8242. We also acknowledge in-kind support from the Electric Power Research Institute. AB and EB acknowledge support from the Purdue Summer Undergraduate Research Fellowship (SURF) and Network for Computational Nanotechnology (NCN) Programs. We thank M. Spencer for assistance in sample preparation and B. Baker and the Center for Materials Characterization at the United States Naval Academy for assistance and time on the SEM. This work was supported by the U.S. Department of Energy, Office of Nuclear Energy under DOE Idaho Operations Office Contract DE-AC07-051D14517 as part of Nuclear Science User Facilities experiment 15-8242. We also acknowledge in-kind support from the Electric Power Research Institute. AB and EB acknowledge support from the Purdue Summer Undergraduate Research Fellowship (SURF) and Network for Computational Nanotechnology (NCN) Programs. We thank M. Spencer for assistance in sample preparation and B. Baker and the Center for Materials Characterization at the United States Naval Academy for assistance and time on the SEM. Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.",
year = "2019",
month = aug,
day = "15",
doi = "10.1007/s11837-019-03532-6",
language = "English (US)",
volume = "71",
pages = "2837--2845",
journal = "JOM",
issn = "1047-4838",
publisher = "Minerals, Metals and Materials Society",
number = "8",
}