Micromechanical finite element analysis of strain partitioning in multiphase medium manganese TWIP plus TRIP steel

被引：193
作者：
Latypov, Marat I. [1 ]
Shin, Sunmi [2 ]
De Cooman, Bruno C. [2 ]
Kim, Hyoung Seop [1 ,3 ]
机构：
[1] POSTECH, Ctr Adv Aerosp Mat, Pohang 790784, South Korea
[2] POSTECH, Grad Inst Ferrous Technol, Pohang 790784, South Korea
[3] POSTECH, Dept Mat Sci & Engn, Pohang 790784, South Korea
来源：
ACTA MATERIALIA | 2016年 / 108卷
基金：
新加坡国家研究基金会;
关键词：
Medium Mn steel; Strain partitioning; TWIP plus TRIP; Finite element methods; TRANSFORMATION-INDUCED PLASTICITY; ANNEALING TEMPERATURE; MECHANICAL-PROPERTIES; TENSILE BEHAVIOR; DEFORMATION; STRESS; GRAIN; NANOINDENTATION; MODEL; SIZE;
D O I：
10.1016/j.actamat.2016.02.001
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In the present contribution, a phenomenological constitutive model of medium manganese steels, in which both twinning-induced (TWIP) and transformation-induced (TRIP) plasticity enhancing mechanisms are activated, is implemented in the finite element framework. The implementation is utilized for the analysis of the full-field strain partitioning in dual-phase microstructure maps obtained from electron backscattering diffraction. The results of the finite element analysis suggest that the strain localization in the studied steel has an alternating character. Specifically, in the low strain region, most of the externally imposed deformation is accommodated by the initially softer austenite. The higher strain hardening rate of austenite due to deformation twinning (TWIP effect) and the mechanically-induced transformation to martensite (TRIP effect) results in a shift of the strain localization to ferrite. This alternating strain localization is a key feature that distinguishes the medium manganese TWIP+TRIP steel. It is shown that this alternating strain localization contributes to the superior mechanical behavior of medium manganese TWIP+TRIP steel reported in the literature. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：219 / 228
页数：10
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