A mechanistic model for creep lifetime of ferritic steels: Application to Grade 91

被引:26
作者
Bieberdorf, Nathan [1 ,2 ]
Tallman, Aaron [1 ]
Kumar, M. Arul [1 ]
Taupin, Vincent [3 ]
Lebensohn, Ricardo A. [4 ]
Capolungo, Laurent [1 ]
机构
[1] Los Alamos Natl Lab, Mat Sci & Technol Div, Los Alamos, NM 87545 USA
[2] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA
[3] Univ Lorraine, LEM3, Arts & Metiers ParisTech, CNRS, F-57000 Metz, France
[4] Los Alamos Natl Lab, Theoret Div, Los Alamos, NM 87545 USA
基金
美国能源部;
关键词
A; creep; B; crystal plasticity; viscoplastic material; porous material; C; finite elements; MODIFIED 9CR-1MO STEEL; CRYSTAL PLASTICITY; DAMAGE MODEL; DIFFUSIVE CAVITATION; VOID NUCLEATION; DEFORMATION; GROWTH; BEHAVIOR; STRESS; EVOLUTION;
D O I
10.1016/j.ijplas.2021.103086
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
In this work, a physics-based crystal plasticity model is developed to predict failure in Grade 91 steel. A microstructure-sensitive dislocation kinetics law defines local plastic slip, an Arrhenius creep law is used to model vacancy-mediated plasticity, and strain hardening evolves with local dislocation density. As voids nucleate, a reaction-diffusion framework is adopted to dynamically track the local void size distributions, which grow by coupled viscoplastic and diffusive processes. Upon accurately reproducing the temperature and stress dependencies in primary, secondary, and tertiary creep seen experimentally for Grade 91 steel, the model is exercised to generate a material response database across a wide range of operating conditions. A new reduced-order lifetime predictor is developed from numerical predictions, and a Bayesian framework is used to quantify prediction uncertainties. When compared to current empirically derived lifetime relations, the proposed lifetime assessment tool predicts rupture times up to several orders more conservative.
引用
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页数:19
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