Influence of nanoparticle reinforcements on the strengthening mechanisms of an ultrafine-grained dual phase steel containing titanium

被引：88
作者：
Kang, Yong-lin [1 ,2 ]
Han, Qi-hang [1 ,3 ]
Zhao, Xian-meng [1 ]
Cai, Ming-hui [3 ]
机构：
[1] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
[2] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China
[3] Deakin Univ, Inst Frontier Mat, Geelong, Vic 3217, Australia
来源：
MATERIALS & DESIGN | 2013年 / 44卷
关键词：
Microstructure; Mechanical properties; Precipitates; Dual phase steel; Strengthening mechanisms; NANOMETER-SIZED CARBIDES; COMPACT STRIP PRODUCTION; TENSILE PROPERTIES; MICROSTRUCTURE; PRECIPITATION; MARTENSITE; FERRITE; AUSTENITE; MO; NB;
D O I：
10.1016/j.matdes.2012.07.068
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
To reduce cost, optimise mechanical properties and improve process tolerance, a series of 1000 MPa grade ultrafine-grained dual phase (DP) steels with nanosized precipitates have been developed based on the C-Si-Mn-Ti alloy system. The grain size of ferrite in ultra-high strength DP steels ranges from 1.1 to 1.7 mu m. The amount of precipitations in the annealed sheet is much more than that in the hot-rolled plates with the highest distribution frequency being between 5 and 10 nm. The grain refinement and precipitation strengthening interact significantly and have a considerable effect on yield strength. Therefore, the strengthening effects cannot be expressed as a simple linear relationship. A modified root-mean-square (RMS) relationship has been proposed to express the yield strength for dual phase steel with obvious grain refinement and precipitation strengthening. (C) 2012 Elsevier Ltd. All rights reserved.
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收藏
页码：331 / 339
页数：9
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