Strength response of 1200 MPa grade martensite-ferrite dual-phase steel under high strain rates

被引：23
|
作者：
Li, Yi [1 ]
Song, Renbo [1 ]
Jiang, Long [1 ]
Zhao, Zhiyang [1 ]
机构：
[1] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
来源：
SCRIPTA MATERIALIA | 2019年 / 164卷
关键词：
Strain rate sensitivity; Martensitic strength; Work hardening; Softening effect; BEHAVIOR; DEFORMATION; MECHANISMS;
D O I：
10.1016/j.scriptamat.2019.01.031
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A commercial 1200 MPa grade martensite-ferrite dual-phase steel (martensite volume fraction is 61.3%) was studied by dynamic tensile tests and Nano-indentation tests. Results indicate that the strain rate sensitivity of this DP1200 steel is mainly owing to the increase of martensitic strength. Both (yield strength) R-p0.2 and (ultimate tensile strength) R-m increase with the increase of strain rate. But the degree of work hardening is decreased when strain rate exceeds the critical value (about 600 s(-1)). The above result is mainly caused by the two facts: i) ferrite loses strain rate sensitivity; ii) softening effect of adiabatic heating on martensite. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：21 / 24
页数：4
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