Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 857, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2022.144058
Keywords
Powder metallurgy; Neutron irradiation; Tensile testing; Electron microscopy; Alloy 625; Ni alloy; Advanced manufacturing
Categories
Funding
- Electric Power Research Institute (EPRI)
- US Nuclear Regulatory Commission [31310021M0035]
- U.S. Department of Energy - Office of Nuclear Energy, through the Nuclear Science User Facilities (NSUF) [15-8242]
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This study compares the response of PM-HIP alloys and forged alloys under neutron irradiation. The results show that PM-HIP alloys have better resistance to irradiation and less hardening. These findings provide hope for the qualification of PM-HIP alloys for nuclear applications.
The nuclear power industry has growing interest in qualifying powder metallurgy with hot isostatic pressing (PM-HIP) to replace traditional alloy fabrication methods for reactor structural components. But there is little known about the response of PM-HIP alloys to reactor conditions. This study directly compares the response of PM-HIP to forged Ni-base Alloy 625 under neutron irradiation doses-0.5-1 displacements per atom (dpa) at temperatures ranging-321-385 degrees C. Post-irradiation examination involves microstructure characterization, ASTM E8 uniaxial tensile testing, and fractography. Up through 1 dpa, PM-HIP Alloy 625 appears more resistant to irradiation-induced cavity nucleation than its forged counterpart, and consequently experiences significantly less hardening. This observed difference in performance can be explained by the higher initial dislocation density of the forged material, which represents an interstitial-biased sink that leaves a vacancy supersaturation to nucleate cavities. These findings show promise for qualification of PM-HIP Alloy 625 for nuclear applications, although higher dose studies are needed to assess the steady-state irradiated microstructure.
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