Microstructural design of multiphase advanced high strength steels

被引：0
作者：
Mechanical and Materials Engineering, Queen's University, Kingston, ON K7L 3N6, Canada [1 ]
不详 [2 ]
不详 [3 ]
机构：
[1] Mechanical and Materials Engineering, Queen's University, Kingston
[2] Mechanical Engineering, McMaster University, Hamilton
[3] Materials Science and Engineering, McMaster University, Hamilton
来源：
Can Metall Q | 2009年 / 3卷 / 237-246期
关键词：
Volume fraction;
D O I：
10.1179/cmq.2009.48.3.237
中图分类号：
学科分类号：
摘要：
The properties of multiphase (MP) Advanced High Strength Steels (DP, TRIP, TWIP) are controlled by dispersed non-ferritic phases (NFP), which can be quenched martensite, deformation-induced martensite, retained austenite or twinned austenite. The yield strength, work hardening and ductility of these steels are determined by the volume fraction, carbon content, scale and spatial distribution of the NFP. This paper summarizes recently published results on the effects of microstructure on the tensile properties of DP and TRIP steels and discusses these observations in terms of micromechanisms of plastic yielding, work hardening and fracture. For DP steels, all three properties are enhanced by developing a fine, uniform distribution of NFP grains. For TRIP steels, the volume fraction of hard NFP increases continuously with strain and the tensile properties are strongly influenced by the rate of austenite transformation (RA stability). RA stability increases with increasing carbon content, decreasing dimensions of RA islands and with increasing strength of the surrounding phase. An optimum combination of RA transformation rate and high strength/hardening is obtained with a TRIP microstructure comprising intercritical ferrite grains + granular bainite. © 2009 Canadian Institute of Mining, Metallurgy and Petroleum.
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页码：237 / 246
页数：9
相关论文
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