Transformation kinetics of retained austenite in the tensile Luders strain range in medium Mn steel

被引：32
|
作者：
Ma, Jiawei [1 ,2 ]
Liu, Haiting [1 ]
Lu, Qi [2 ]
Zhong, Yong [3 ]
Wang, Li [3 ]
Shen, Yao [1 ]
机构：
[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China
[2] GM China Investment Co Ltd, Gen Motors China Sci Lab, Shanghai 201206, Peoples R China
[3] Baosteel Grp, State Key Lab Dev & Applicat Technol Automot Stee, Shanghai Baoshan 201900, Peoples R China
来源：
SCRIPTA MATERIALIA | 2019年 / 169卷
基金：
中国国家自然科学基金;
关键词：
Medium Mn steel; Martensitic phase transformation; Luders band; Work hardening; MARTENSITIC-TRANSFORMATION; BEHAVIOR; DEFORMATION; STABILITY; ULTRAFINE; DUCTILITY; STRENGTH; TEMPERATURE;
D O I：
10.1016/j.scriptamat.2019.04.044
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Medium Mn steel usually exhibits Luders banding behavior accompanied with austenite-to-martensite transformation during deformation. In tensile tests with standard samples, Luders front exhibits steep gradients in thickness and strain, which brings difficulty in measuring the transformation kinetics in the Luders strain range. To overcome it, a special-shaped specimen was designed to introduce a gradient in tensile stress along the transverse direction and additional geometrical constraints. The measured transformation kinetics exhibited two stages. Most transformation occurred at the first half range and almost no transformation afterwards. This demonstrates that austenite-to-martensite transformation does not directly provide strain hardening for Luders band propagation. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
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页码：1 / 5
页数：5
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