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Title: A physics-based crystallographic modeling framework for describing the thermal creep behavior of Fe-Cr alloys

Abstract

In this work, a physics-based thermal creep model is developed based on the understanding of the microstructure in Fe-Cr alloys. This model is associated with a transition state theory based framework that considers the distribution of internal stresses at sub-material point level. The thermally activated dislocation glide and climb mechanisms are coupled in the obstacle-bypass processes for both dislocation and precipitate-type barriers. A kinetic law is proposed to track the dislocation densities evolution in the subgrain interior and in the cell wall. The predicted results show that this model, embedded in the visco-plastic self-consistent (VPSC) framework, captures well the creep behaviors for primary and steady-state stages under various loading conditions. We also discuss the roles of the mechanisms involved.

Authors:
 [1]; ORCiD logo [1];  [1];  [1]
  1. 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:
1369190
Report Number(s):
LA-UR-16-28574
Journal ID: ISSN 1073-5623; TRN: US1702330
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science
Additional Journal Information:
Journal Volume: 48; Journal Issue: 5; Journal ID: ISSN 1073-5623
Publisher:
ASM International
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Wen, Wei, Capolungo, Laurent, Patra, Anirban, and Tome, Carlos. A physics-based crystallographic modeling framework for describing the thermal creep behavior of Fe-Cr alloys. United States: N. p., 2017. Web. doi:10.1007/s11661-017-4011-3.
Wen, Wei, Capolungo, Laurent, Patra, Anirban, & Tome, Carlos. A physics-based crystallographic modeling framework for describing the thermal creep behavior of Fe-Cr alloys. United States. doi:10.1007/s11661-017-4011-3.
Wen, Wei, Capolungo, Laurent, Patra, Anirban, and Tome, Carlos. Thu . "A physics-based crystallographic modeling framework for describing the thermal creep behavior of Fe-Cr alloys". United States. doi:10.1007/s11661-017-4011-3. https://www.osti.gov/servlets/purl/1369190.
@article{osti_1369190,
title = {A physics-based crystallographic modeling framework for describing the thermal creep behavior of Fe-Cr alloys},
author = {Wen, Wei and Capolungo, Laurent and Patra, Anirban and Tome, Carlos},
abstractNote = {In this work, a physics-based thermal creep model is developed based on the understanding of the microstructure in Fe-Cr alloys. This model is associated with a transition state theory based framework that considers the distribution of internal stresses at sub-material point level. The thermally activated dislocation glide and climb mechanisms are coupled in the obstacle-bypass processes for both dislocation and precipitate-type barriers. A kinetic law is proposed to track the dislocation densities evolution in the subgrain interior and in the cell wall. The predicted results show that this model, embedded in the visco-plastic self-consistent (VPSC) framework, captures well the creep behaviors for primary and steady-state stages under various loading conditions. We also discuss the roles of the mechanisms involved.},
doi = {10.1007/s11661-017-4011-3},
journal = {Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science},
number = 5,
volume = 48,
place = {United States},
year = {Thu Feb 23 00:00:00 EST 2017},
month = {Thu Feb 23 00:00:00 EST 2017}
}

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