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Title: Mechanism-based modeling of thermal and irradiation creep behavior: An application to ferritic/martensitic HT9 steel

Abstract

In this work, the creep behavior of HT9 steel in both thermal and irradiation environments is predicted using an integrated modeling framework. Multiple physical mechanisms such as diffusional creep and dislocation climb are incorporated into crystal plasticity calculations using the Visco-Plastic Self-Consistent (VPSC) approach. Climb velocities are informed by mean field rate theory laws in place of empirical power law formulations. More interestingly, the climb velocities explicitly consider the contribution of irradiation-induced point defects, i.e., stress induced preferential absorption (SIPA) effect. The developed expressions are shown to apply under conventional thermal creep and to the more complex irradiation conditions as well. This physically-informed, mechanism-based model is used to simulate the creep strain evolution of HT9 pressurized tubes under various loading conditions. Furthermore, it is demonstrated that the experimental behavior of this material reported in the literature is well described by this theoretical framework. The role of each relevant mechanism is discussed.

Authors:
 [1];  [2]; ORCiD logo [2]; ORCiD logo [2];  [2]
  1. Lancaster Univ., Lancaster (United Kingdom)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1581575
Report Number(s):
LA-UR-19-28064
Journal ID: ISSN 0749-6419; TRN: US2100871
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
International Journal of Plasticity
Additional Journal Information:
Journal Volume: 126; Journal Issue: C; Journal ID: ISSN 0749-6419
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Thermal creep; Irradiation creep; HT9 steel; Crystal plasticity

Citation Formats

Wen, Wei, Kohnert, Aaron Anthony, Kumar, M. Arul, Capolungo, Laurent, and Tomé, Carlos N. Mechanism-based modeling of thermal and irradiation creep behavior: An application to ferritic/martensitic HT9 steel. United States: N. p., 2019. Web. https://doi.org/10.1016/j.ijplas.2019.11.012.
Wen, Wei, Kohnert, Aaron Anthony, Kumar, M. Arul, Capolungo, Laurent, & Tomé, Carlos N. Mechanism-based modeling of thermal and irradiation creep behavior: An application to ferritic/martensitic HT9 steel. United States. https://doi.org/10.1016/j.ijplas.2019.11.012
Wen, Wei, Kohnert, Aaron Anthony, Kumar, M. Arul, Capolungo, Laurent, and Tomé, Carlos N. Thu . "Mechanism-based modeling of thermal and irradiation creep behavior: An application to ferritic/martensitic HT9 steel". United States. https://doi.org/10.1016/j.ijplas.2019.11.012. https://www.osti.gov/servlets/purl/1581575.
@article{osti_1581575,
title = {Mechanism-based modeling of thermal and irradiation creep behavior: An application to ferritic/martensitic HT9 steel},
author = {Wen, Wei and Kohnert, Aaron Anthony and Kumar, M. Arul and Capolungo, Laurent and Tomé, Carlos N.},
abstractNote = {In this work, the creep behavior of HT9 steel in both thermal and irradiation environments is predicted using an integrated modeling framework. Multiple physical mechanisms such as diffusional creep and dislocation climb are incorporated into crystal plasticity calculations using the Visco-Plastic Self-Consistent (VPSC) approach. Climb velocities are informed by mean field rate theory laws in place of empirical power law formulations. More interestingly, the climb velocities explicitly consider the contribution of irradiation-induced point defects, i.e., stress induced preferential absorption (SIPA) effect. The developed expressions are shown to apply under conventional thermal creep and to the more complex irradiation conditions as well. This physically-informed, mechanism-based model is used to simulate the creep strain evolution of HT9 pressurized tubes under various loading conditions. Furthermore, it is demonstrated that the experimental behavior of this material reported in the literature is well described by this theoretical framework. The role of each relevant mechanism is discussed.},
doi = {10.1016/j.ijplas.2019.11.012},
journal = {International Journal of Plasticity},
number = C,
volume = 126,
place = {United States},
year = {2019},
month = {11}
}

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