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Title: The correlation between microstructure and nanoindentation property of neutron-irradiated austenitic alloy D9

Journal Article · · Acta Materialia
ORCiD logo [1]; ORCiD logo [2];  [3];  [3];  [4];  [4]; ORCiD logo [5]
  1. Oregon State Univ., Corvallis, OR (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  3. Oregon State Univ., Corvallis, OR (United States)
  4. Boise State Univ., ID (United States); Center for Advanced Energy Studies, Idaho Falls, ID (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The microstructure and nanomechanical properties of three samples of the modified stainless steel (referred as the alloy D9) were systematically characterized after neutron irradiation in the Advanced Test Reactor. The samples were irradiated to 5.0, 8.2, and 9.2 displacements per atom at 448, 430, and 683°C, respectively. The evolutions of dislocation loops, cavities, and radiation-induced precipitates were quantitatively studied to reveal their dose and temperature dependencies. Nanohardness and nanoindentation creep tests were conducted at room temperature on the irradiated samples. Unexpected radiation hardening was observed in the highest-temperature-irradiated sample due to the formation of an unknown type of Ni- and Si-rich precipitates whose contributions to the radiation and mechanical performances of the alloy were discussed. We provide the radiation-microstructure-property correlations of alloy D9 with new insights, which can benefit the development and optimization of advanced austenitic alloys for future nuclear applications.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1649397
Alternate ID(s):
OSTI ID: 1633356
Journal Information:
Acta Materialia, Vol. 195, Issue n/a; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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