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Title: Multi-scale simulation of radiation damage accumulation and subsequent hardening in neutron-irradiated α-Fe

A hierarchical methodology is introduced to predict the effects of radiation damage and irradiation conditions on the yield stress and internal stress heterogeneity developments in polycrystalline α-Fe. Simulations of defect accumulation under displacement cascade damage conditions are performed using spatially resolved stochastic cluster dynamics. The resulting void and dislocation loop concentrations and average sizes are then input into a crystal plasticity formulation that accounts for the change in critical resolved shear stress due to the presence of radiation induced defects. The simulated polycrystalline tensile tests show a good match to experimental hardening data over a wide range of irradiation doses. With this capability, stress heterogeneity development and the effect of dose rate on hardening is investigated. The model predicts increased hardening at higher dose rates for low total doses. By contrast, at doses above 10–2 dpa when cascade overlap becomes significant, the model does not predict significantly different hardening for different dose rates. In conclusion, the development of such a model enables simulation of radiation damage accumulation and associated hardening without relying on experimental data as an input under a wide range of irradiation conditions such as dose, dose rate, and temperature.
Authors:
 [1] ;  [2] ;  [3]
  1. Georgia Inst. of Technology, Georgia Tech., Metz (France); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  3. Georgia Inst. of Technology, Georgia Tech., Metz (France)
Publication Date:
OSTI Identifier:
1258477
Report Number(s):
SAND--2015-10308J
Journal ID: ISSN 0965-0393; 642139
Grant/Contract Number:
AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
Modelling and Simulation in Materials Science and Engineering
Additional Journal Information:
Journal Volume: 24; Journal Issue: 1; Journal ID: ISSN 0965-0393
Publisher:
IOP Publishing
Research Org:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
61 RADIATION PROTECTION AND DOSIMETRY radiation defects; cascade damage; radiation hardening; crystal plasticity; cluster dynamics