Heat treatment, microstructure and mechanical properties of a C-Mn-Al-P hot dip galvanizing TRIP steel

被引:25
作者
Ding, Wei [1 ,2 ,3 ]
Hedstrom, Peter [2 ]
Li, Yan [2 ,3 ]
机构
[1] Inner Mongolia Univ Sci & Technol, Sch Met & Mat, Baotou 014010, Peoples R China
[2] KIT Royal Inst Technol, Dept Mat Sci & Engn, SE-10044 Stockholm, Sweden
[3] Inner Mongolia Univ Sci & Technol, Bayan Obo Multimetall Resource Comprehens Utiliza, Baotou 014010, Peoples R China
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2016年 / 674卷
基金
中国国家自然科学基金;
关键词
Hot Dip Galvanizing TRIP Steel; Mechanical Properties; Isothermal bainitic transformation; Microstructure; Heat treatment; TRANSFORMATION-INDUCED PLASTICITY; ASSISTED MULTIPHASE STEELS; COLD-ROLLED STEELS; RETAINED AUSTENITE; FATIGUE BEHAVIOR; MARTENSITE; SI; PHOSPHORUS; ADDITIONS; BAINITE;
D O I
10.1016/j.msea.2016.07.119
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Heat treatments of a hot dip galvanizing TRIP (Transformation induced plasticity) steel with chemical composition 0.20C-1.50Mn-1.2Al-0.07P(mass%) were performed in a Gleeble 3500 laboratory equipment. The heat treatment process parameters were varied to investigate the effect of intercritical annealing temperature as well as isothermal bainitic transformation (IBT) temperature and time, on the microstructure and the mechanical properties. The microstructure was investigated using scanning electron microscopy, transmission electron microscopy and x-ray diffraction, while mechanical properties were evaluated by tensile testing. Furthermore, to generate a better understanding of the phase transformations during heat treatment, dilatometry trials were conducted. The desired microstructure containing ferrite, bainite, retained austenite and martensite was obtained after the heat treatments. It was further found that the IBT is critical in determining the mechanical properties of the steel, since it controls the fraction of bainite. With increasing bainite fraction, the fraction of retained austenite increases while the fraction of martensite decreases. The mechanical properties of the steel are excellent with a tensile strength above 780 MPa (expect in one case) and elongation above 22%. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:151 / 157
页数:7
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