Microstructure, mechanical properties and fracture behavior of ultra-high strength dual-phase steel

被引：56
作者：
Zhao, Zhengzhi [1 ,2 ]
Tong, Tingting [1 ,2 ]
Liang, Juhua [1 ,2 ]
Yin, Hongxiang [1 ,2 ]
Zhao, Aimin [1 ,2 ]
Tang, Di [1 ,2 ]
机构：
[1] Univ Sci & Technol Beijing, Engn Res Inst, Beijing 100083, Peoples R China
[2] Beijing Lab Modern Traff Met Mat & Proc Technol, Beijing 100083, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 618卷
基金：
中国国家自然科学基金;
关键词：
Dual-phase steel; Annealing temperatures; Mechanical properties; Damage initiation and propagation; WORK-HARDENING BEHAVIOR; DEFORMATION; TEMPERATURE;
D O I：
10.1016/j.msea.2014.09.005
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
An ultra-high strength dual-phase steel with main components 0.16C-1.38Si-3.20Mn was produced by cold rolling followed by intercritical heat treatment. Influences of different annealing temperatures on the mechanical properties were investigated, focusing on the development of localized deformation as well as crack initiation and propagation. The work hardening behavior of tested steels after annealing was analyzed in terms of the modified C-J analysis. The experimental results indicate that the microstructures of all the tested steels contain ferrite and martensite. Annealing at 800 degrees C, the best comprehensive performance with a yield strength of 873 MPa, tensile strength of 1483 MPa, total elongation of 11% and yield ratio of 0.58 was achieved. Besides, the mechanisms of damage taking place in the ferrite and crack initiating at the interface between the ferrite and martensite have been observed. The crack initiating perpendicular to the lath of the martensite and then following at or near the narrowest part of a martensite ligament have also been observed. The original crack propagation exhibits a transgranular fracture feature. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：182 / 188
页数：7
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