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Title: Microchemical evolution of irradiated additive-manufactured HT9

Abstract

The microstructural responses under 5 MeV Fe2+ single-ion-beam irradiation of three conditions of additive-manufactured (AM) HT9 steel using a powder-based directed energy deposition (DED) technique with and without postbuild heat treatments were investigated. Besides the observed dislocation loop formation and the absence of cavities at the irradiation condition of 50 dpa at 460 °C, Ni/Si/Mn-rich precipitates are found to form in all three conditions of AM-HT9, whereas Cu-rich clusters that arise from Cu uptake from the DED process are only observed in the heat-treated conditions, and not in the as-built (ASB) condition. Coprecipitation of the Cu- and Ni/Si/Mn-rich clusters occur near defect sinks such as line dislocations and grain boundaries in the heat-treated AM-HT9. The variation in microchemical evolution can be directly linked to the starting sink strength of the three AM-HT9 conditions, and the ASB condition with higher sink strength suppressed the responses observed in the postbuild heat-treated specimens.

Authors:
 [1];  [2];  [1]; ORCiD logo [3];  [4];  [5];  [6]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Michigan, Ann Arbor, MI (United States)
  4. Northwestern Univ., Evanston, IL (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Lincoln Electric Company (India) Private Limited, Tamil Nadu (India)
  6. Univ. of Michigan, Ann Arbor, MI (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1847540
Grant/Contract Number:  
AC05-00OR22725; AC07-051D14517
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 559; Journal Issue: 1; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING; 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; Additive Manufacturing; Ferritic-Martensitic HT9 Steel; Irradiation; Clustering; Precipitation

Citation Formats

Xiu, Pengyuan, Massey, Caleb, Green, Theresa Mary Kelsy, Taller, Stephen, Isheim, Dieter, Sridharan, Niyanth, and Field, Kevin G. Microchemical evolution of irradiated additive-manufactured HT9. United States: N. p., 2021. Web. doi:10.1016/j.jnucmat.2021.153410.
Xiu, Pengyuan, Massey, Caleb, Green, Theresa Mary Kelsy, Taller, Stephen, Isheim, Dieter, Sridharan, Niyanth, & Field, Kevin G. Microchemical evolution of irradiated additive-manufactured HT9. United States. https://doi.org/10.1016/j.jnucmat.2021.153410
Xiu, Pengyuan, Massey, Caleb, Green, Theresa Mary Kelsy, Taller, Stephen, Isheim, Dieter, Sridharan, Niyanth, and Field, Kevin G. Sat . "Microchemical evolution of irradiated additive-manufactured HT9". United States. https://doi.org/10.1016/j.jnucmat.2021.153410. https://www.osti.gov/servlets/purl/1847540.
@article{osti_1847540,
title = {Microchemical evolution of irradiated additive-manufactured HT9},
author = {Xiu, Pengyuan and Massey, Caleb and Green, Theresa Mary Kelsy and Taller, Stephen and Isheim, Dieter and Sridharan, Niyanth and Field, Kevin G.},
abstractNote = {The microstructural responses under 5 MeV Fe2+ single-ion-beam irradiation of three conditions of additive-manufactured (AM) HT9 steel using a powder-based directed energy deposition (DED) technique with and without postbuild heat treatments were investigated. Besides the observed dislocation loop formation and the absence of cavities at the irradiation condition of 50 dpa at 460 °C, Ni/Si/Mn-rich precipitates are found to form in all three conditions of AM-HT9, whereas Cu-rich clusters that arise from Cu uptake from the DED process are only observed in the heat-treated conditions, and not in the as-built (ASB) condition. Coprecipitation of the Cu- and Ni/Si/Mn-rich clusters occur near defect sinks such as line dislocations and grain boundaries in the heat-treated AM-HT9. The variation in microchemical evolution can be directly linked to the starting sink strength of the three AM-HT9 conditions, and the ASB condition with higher sink strength suppressed the responses observed in the postbuild heat-treated specimens.},
doi = {10.1016/j.jnucmat.2021.153410},
journal = {Journal of Nuclear Materials},
number = 1,
volume = 559,
place = {United States},
year = {Sat Nov 20 00:00:00 EST 2021},
month = {Sat Nov 20 00:00:00 EST 2021}
}

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