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research-article

Investigation on microstructure and martensitic transformation mechanism for the warm-stamped third-generation automotive medium-Mn steel

[+] Author and Article Information
Xiaodong Li

School of Automotive Engineering, State Key Lab of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China
lixiaodong@dlut.edu.cn

Ying Chang

School of Automotive Engineering, State Key Lab of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China
yingc@dlut.edu.cn

Cunyu Wang

East China Branch of Central Iron & Steel Research Institute(CISRI), Beijing 100081, China
wangcunyu@ec-cisri.com.cn

Shuo Han

School of Automotive Engineering, State Key Lab of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China
2273885419@qq.com

Daxin Ren

School of Automotive Engineering, State Key Lab of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China
rendx@dlut.edu.cn

Ping Hu

School of Automotive Engineering, State Key Lab of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China
hup_1956@163.com

Han Dong

East China Branch of Central Iron & Steel Research Institute(CISRI), Beijing 100081, China
dong_1962@163.com

1Corresponding author.

ASME doi:10.1115/1.4037017 History: Received November 24, 2016; Revised April 11, 2017

Abstract

With the development of the automotive industry, the application of the high strength steel becomes an effective way to improve the lightweight and safety. In this paper, the third-generation automotive medium-Mn steel (TAMM steel) is studied. The warm-stamped TAMM steel holds the complete and fine-grained martensitic microstructure without decarbonization layer, which contributes to high and well-balanced mechanical properties. Furthermore, the martensitic transformation mechanism of the TAMM steel are investigated by the dilatation tests. The results indicate that the effects of the loading method on the Ms temperature under different loads are different. The Ms temperature is hardly influenced under the tensile loads and low compressive load. However, it is slightly decreased under the high compressive load. Moreover, the effects of the strain and strain rate on the Ms temperature are insignificant and can be neglected. As a result, this research proves that the martensitic transformation of the TAMM steel is rarely influenced by the process parameters, such as stamping temperature, loading method, load, strain and strain rate. The actual stamping process can be designed and controlled accurately referring to the CCT curves to realize the required properties and improve the formability of the automotive part.

Copyright (c) 2017 by ASME
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