A constitutive model accounting for strain ageing effects on work-hardening. Application to a C-Mn steel

被引：19

作者：

Ren, Sicong ^{[1
]}

Maziere, Matthieu ^{[1
]}

Forest, Samuel ^{[1
]}

Morgeneyer, Thilo F. ^{[1
]}

Rousselier, Gilles ^{[1
]}

机构：

[1] PSL Res Univ, MINES ParisTech, MAT Ctr Mat, CNRS UMR 7633, BP 87, F-91003 Evry, France

来源：

COMPTES RENDUS MECANIQUE | 2017年 / 345卷 / 12期

关键词：

Portevin-Le Chatelier effect; Dislocation density; Identification; FEM simulation; Plasticity; C-Mn steel; LE-CHATELIER BANDS; ALUMINUM-ALLOY; DUCTILE FRACTURE; RATE SENSITIVITY; SERRATED FLOW; PORTEVIN; BEHAVIOR; DEFORMATION; MG; TEMPERATURE;

D O I：

10.1016/j.crme.2017.09.005

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

One of the most successful models for describing the Portevin-Le Chatelier effect in engineering applications is the Kubin-Estrin-McCormick model (KEMC). In the present work, the influence of dynamic strain ageing on dynamic recovery due to dislocation annihilation is introduced in order to improve the KEMC model. This modification accounts for additional strain hardening rate due to limited dislocation annihilation by the diffusion of solute atoms and dislocation pinning at low strain rate and/or high temperature. The parameters associated with this novel formulation are identified based on tensile tests for a C-Mn steel at seven temperatures ranging from 20 degrees C to 350 degrees C. The validity of the model and the improvement compared to existing models are tested using 2D and 3D finite element simulations of the Portevin-Le Chatelier effect in tension. (C) 2017 Academie des sciences. Published by Elsevier Masson SAS.

引用

页码：908 / 921

页数：14

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