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Dislocation channel broadening–A new mechanism to improve irradiation-assisted stress corrosion cracking resistance of additively manufactured 316 L stainless steel

Journal Article · · Acta Materialia
 [1];  [2];  [1];  [1];  [1];  [3];  [4];  [5];  [1];  [1]
  1. Purdue University, West Lafayette, IN (United States)
  2. Idaho National Laboratory (INL), Idaho Falls, ID (United States)
  3. North Carolina State University, Raleigh, NC (United States)
  4. Center for Advanced Energy Studies (CAES), Idaho Falls, ID (United States)
  5. University of Michigan, Ann Arbor, MI (United States)

Additively manufactured (AM) 316 L stainless steel (SS) after hot isostatic pressing (HIP) was found to exhibit superior resistance to irradiation-assisted stress corrosion cracking (IASCC) in high-temperature water, as compared to wrought 316 L SS. The well-accepted IASCC factors of radiation-induced segregation (RIS) and radiation hardening are not accurate descriptions of IASCC susceptibility in this case. A decreased strain localization along grain boundaries, caused by dislocation channel broadening, was confirmed to suppress crack initiation. A unique distribution of irradiation-induced defects in HIP AM 316 L SS eased dislocation cross-slip compared to those in the wrought counterpart, thus increasing the channel width near the grain boundaries. Here for the first time, this study highlights the importance of dislocation channel broadening as a potential mechanism to further improve the IASCC resistance of 316 L SS and provides direct experimental evidence based on commercial-grade materials.

Research Organization:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP); USDOE Laboratory Directed Research and Development (LDRD) Program; US Nuclear Regulatory Commission (NRC)
Grant/Contract Number:
AC07-05ID14517; NE0009193
OSTI ID:
2348866
Alternate ID(s):
OSTI ID: 2282665
Report Number(s):
INL/JOU--24-77919-Revision-0
Journal Information:
Acta Materialia, Journal Name: Acta Materialia Journal Issue: - Vol. 266; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (19)