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Title: Diffusion-coupled cohesive interface simulations of stress corrosion intergranular cracking in polycrystalline materials

Abstract

To study the stress corrosion intergranular cracking mechanism, a diffusion-coupled cohesive zone model (CZM) is proposed for the simulation of the stress-assisted diffusional process along grain boundaries and the mechanical response of grain boundary sliding and separation. This simulation methodology considers the synergistic effects of impurity diffusion driven by pressure gradient and degradation of grain boundary strength by impurity concentration. The diffusion-coupled CZM is combined with crystal plasticity finite element model (CPFEM) to simulate intergranular fracture of polycrystalline material under corrosive environment. Significant heterogeneity of the stress field and extensive impurity accumulation is observed at grain boundaries and junction points. Deformation mechanism maps are constructed with respect to the grain boundary degradation factor and applied strain rate, which dictate the transition from internal to near-surface intergranular fracture modes under various strain amplitudes and grain sizes.

Authors:
; ORCiD logo; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1389308
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Acta Materialia; Journal Volume: 136; Journal Issue: C
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Cohesive interface model; Intergranular fracture; Stress-assisted diffusion

Citation Formats

Pu, Chao, Gao, Yanfei, Wang, Yanli, and Sham, T. -L.. Diffusion-coupled cohesive interface simulations of stress corrosion intergranular cracking in polycrystalline materials. United States: N. p., 2017. Web. doi:10.1016/j.actamat.2017.06.058.
Pu, Chao, Gao, Yanfei, Wang, Yanli, & Sham, T. -L.. Diffusion-coupled cohesive interface simulations of stress corrosion intergranular cracking in polycrystalline materials. United States. doi:10.1016/j.actamat.2017.06.058.
Pu, Chao, Gao, Yanfei, Wang, Yanli, and Sham, T. -L.. Fri . "Diffusion-coupled cohesive interface simulations of stress corrosion intergranular cracking in polycrystalline materials". United States. doi:10.1016/j.actamat.2017.06.058.
@article{osti_1389308,
title = {Diffusion-coupled cohesive interface simulations of stress corrosion intergranular cracking in polycrystalline materials},
author = {Pu, Chao and Gao, Yanfei and Wang, Yanli and Sham, T. -L.},
abstractNote = {To study the stress corrosion intergranular cracking mechanism, a diffusion-coupled cohesive zone model (CZM) is proposed for the simulation of the stress-assisted diffusional process along grain boundaries and the mechanical response of grain boundary sliding and separation. This simulation methodology considers the synergistic effects of impurity diffusion driven by pressure gradient and degradation of grain boundary strength by impurity concentration. The diffusion-coupled CZM is combined with crystal plasticity finite element model (CPFEM) to simulate intergranular fracture of polycrystalline material under corrosive environment. Significant heterogeneity of the stress field and extensive impurity accumulation is observed at grain boundaries and junction points. Deformation mechanism maps are constructed with respect to the grain boundary degradation factor and applied strain rate, which dictate the transition from internal to near-surface intergranular fracture modes under various strain amplitudes and grain sizes.},
doi = {10.1016/j.actamat.2017.06.058},
journal = {Acta Materialia},
number = C,
volume = 136,
place = {United States},
year = {Fri Sep 01 00:00:00 EDT 2017},
month = {Fri Sep 01 00:00:00 EDT 2017}
}