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Title: Defect sink characteristics of specific grain boundary types in 304 stainless steels under high dose neutron environments

Radiation induced segregation (RIS) is a well-studied phenomena which occurs in many structurally relevant nuclear materials including austenitic stainless steels. RIS occurs due to solute atoms preferentially coupling to mobile point defect fluxes that migrate and interact with defect sinks. Here, a 304 stainless steel was neutron irradiated up to 47.1 dpa at 320 °C. Investigations into the RIS response at specific grain boundary types were utilized to determine the sink characteristics of different boundary types as a function of irradiation dose. A rate theory model built on the foundation of the modified inverse Kirkendall (MIK) model is proposed and benchmarked to the experimental results. This model, termed the GiMIK model, includes alterations in the boundary conditions based on grain boundary structure and includes expressions for interstitial binding. This investigation, through experiment and modeling, found specific grain boundary structures exhibit unique defect sink characteristics depending on their local structure. Such interactions were found to be consistent across all doses investigated and had larger global implications including precipitation of Ni-Si clusters near different grain boundary types.
Authors:
 [1] ;  [1] ;  [2] ;  [1]
  1. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  2. Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Publication Date:
OSTI Identifier:
1177621
Report Number(s):
INL/JOU--14-33513
Journal ID: ISSN 1359-6454; TRN: US1500055
DOE Contract Number:
AC07-05ID14517
Resource Type:
Journal Article
Resource Relation:
Journal Name: Acta Materialia; Journal Volume: 89
Publisher:
Elsevier
Research Org:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
Language:
English
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; STAINLESS STEEL-304; GRAIN BOUNDARIES; ATOMIC DISPLACEMENTS; POINT DEFECTS; PRECIPITATION; SEGREGATION; SOLUTES; Temperature Range 0400-1000 K; Solid Clusters; Nickel; Silicon STEEL; GRAIN BOUNDARY; IRRADIATION; SEGREGATION; MISORIENTATION