Comparison of ion irradiation effects in PM-HIP and forged alloy 625

Caleb Clement; Yangyang Zhao; Patrick Warren; Xiang Liu; Sichuang Xue; David W. Gandy; Janelle P. Wharry

doi:10.1016/j.jnucmat.2021.153390

Comparison of ion irradiation effects in PM-HIP and forged alloy 625

Caleb Clement, Yangyang Zhao, Patrick Warren, Xiang Liu, Sichuang Xue, David W. Gandy, Janelle P. Wharry

Research output: Contribution to journal › Article › peer-review

Abstract

The nuclear industry has growing interest in replacing forgings with structural components fabricated by powder metallurgy with hot isostatic pressing (PM-HIP), owing to their chemical homogeneity, uniform grain structure, and near-net shape production. This study compares the ion irradiation response of PM-HIP and forged Alloy 625, over 50 and 100 dpa, 400 °C and 500 °C. Microstructure is characterized using down-zone bright-field scanning transmission electron microscopy (DZBFSTEM), and hardening is characterized using nanoindentation. PM-HIP Alloy 625 has a lower initial dislocation line density, resulting in a more rapid onset of dislocation loop growth and unfaulting than the forged material. But the total defect population (i.e. loop line length plus dislocation density) is insensitive to fabrication method. This finding shows promise for the eventual qualification of PM-HIP alloys for nuclear applications.

Original language	English (US)
Article number	153390
Journal	Journal of Nuclear Materials
Volume	558
DOIs	https://doi.org/10.1016/j.jnucmat.2021.153390
State	Published - Jan 2022
Externally published	Yes

Keywords

Advanced manufacturing
Alloy 625
Electron microscopy
Ion irradiation
Nanoindentation
Ni-base superalloys
PM-HIP
Powder metallurgy

ASJC Scopus subject areas

Nuclear and High Energy Physics
General Materials Science
Nuclear Energy and Engineering

Online availability

10.1016/j.jnucmat.2021.153390

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title = "Comparison of ion irradiation effects in PM-HIP and forged alloy 625",

abstract = "The nuclear industry has growing interest in replacing forgings with structural components fabricated by powder metallurgy with hot isostatic pressing (PM-HIP), owing to their chemical homogeneity, uniform grain structure, and near-net shape production. This study compares the ion irradiation response of PM-HIP and forged Alloy 625, over 50 and 100 dpa, 400 °C and 500 °C. Microstructure is characterized using down-zone bright-field scanning transmission electron microscopy (DZBFSTEM), and hardening is characterized using nanoindentation. PM-HIP Alloy 625 has a lower initial dislocation line density, resulting in a more rapid onset of dislocation loop growth and unfaulting than the forged material. But the total defect population (i.e. loop line length plus dislocation density) is insensitive to fabrication method. This finding shows promise for the eventual qualification of PM-HIP alloys for nuclear applications.",

keywords = "Advanced manufacturing, Alloy 625, Electron microscopy, Ion irradiation, Nanoindentation, Ni-base superalloys, PM-HIP, Powder metallurgy",

author = "Caleb Clement and Yangyang Zhao and Patrick Warren and Xiang Liu and Sichuang Xue and Gandy, {David W.} and Wharry, {Janelle P.}",

note = "This work was supported by the Electric Power Research Institute (EPRI). Irradiation experiments and microstructure characterization was supported by the US Department of Energy – Office of Nuclear Energy, through the Nuclear Science User Facilities (NSUF) contracts 15–8242 and 18–1412. The authors thank Dr. Yaqiao Wu, Megha Dubey, and the staff at the Center for Advanced Energy Studies (CAES) for assisting with portions of the work. Additionally, the authors thank Dr. Rosa Diaz and Dr. Chris Gilpin for assistance at the Purdue Electron Microscopy Facility and Birck Nanotechnology Center.",

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doi = "10.1016/j.jnucmat.2021.153390",

language = "English (US)",

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journal = "Journal of Nuclear Materials",

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AU - Gandy, David W.

AU - Wharry, Janelle P.

N1 - This work was supported by the Electric Power Research Institute (EPRI). Irradiation experiments and microstructure characterization was supported by the US Department of Energy – Office of Nuclear Energy, through the Nuclear Science User Facilities (NSUF) contracts 15–8242 and 18–1412. The authors thank Dr. Yaqiao Wu, Megha Dubey, and the staff at the Center for Advanced Energy Studies (CAES) for assisting with portions of the work. Additionally, the authors thank Dr. Rosa Diaz and Dr. Chris Gilpin for assistance at the Purdue Electron Microscopy Facility and Birck Nanotechnology Center.

PY - 2022/1

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N2 - The nuclear industry has growing interest in replacing forgings with structural components fabricated by powder metallurgy with hot isostatic pressing (PM-HIP), owing to their chemical homogeneity, uniform grain structure, and near-net shape production. This study compares the ion irradiation response of PM-HIP and forged Alloy 625, over 50 and 100 dpa, 400 °C and 500 °C. Microstructure is characterized using down-zone bright-field scanning transmission electron microscopy (DZBFSTEM), and hardening is characterized using nanoindentation. PM-HIP Alloy 625 has a lower initial dislocation line density, resulting in a more rapid onset of dislocation loop growth and unfaulting than the forged material. But the total defect population (i.e. loop line length plus dislocation density) is insensitive to fabrication method. This finding shows promise for the eventual qualification of PM-HIP alloys for nuclear applications.

AB - The nuclear industry has growing interest in replacing forgings with structural components fabricated by powder metallurgy with hot isostatic pressing (PM-HIP), owing to their chemical homogeneity, uniform grain structure, and near-net shape production. This study compares the ion irradiation response of PM-HIP and forged Alloy 625, over 50 and 100 dpa, 400 °C and 500 °C. Microstructure is characterized using down-zone bright-field scanning transmission electron microscopy (DZBFSTEM), and hardening is characterized using nanoindentation. PM-HIP Alloy 625 has a lower initial dislocation line density, resulting in a more rapid onset of dislocation loop growth and unfaulting than the forged material. But the total defect population (i.e. loop line length plus dislocation density) is insensitive to fabrication method. This finding shows promise for the eventual qualification of PM-HIP alloys for nuclear applications.

KW - Advanced manufacturing

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Comparison of ion irradiation effects in PM-HIP and forged alloy 625

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