Fatigue properties of Ti microalloyed high-strength steel by CSP process

被引：0

作者：

Tian, Xing ^{[1
]}

Zhang, Yong-Kun ^{[2
]}

Tan, Jia-Mei ^{[2
]}

Kang, Yong-Lin ^{[1
]}

机构：

[1] School of Materials Science and Engineering, University of Science and Technology Beijing

[2] CSP Branch of General Wire Rod Mill, Wuhan Iron and Steel (Group) Co.

来源：

Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | 2014年 / 36卷 / 06期

关键词：

Fatigue properties; High strength steel; Microalloying; Microstructure; Titanium;

D O I：

10.13374/j.issn1001-053x.2014.06.011

中图分类号：

学科分类号：

摘要：

The fatigue properties of 2 mm-thick Ti-microalloyed high-strength steel produced in a CSP line was studied by the up-down method. It is found that the tensile strength of the steel is 830 MPa, the fatigue strength is 685 MPa, about 0.83 times as large as the tensile strength, and the elongation is 18.8%. The S-N curve of the steel was drawn out and the relationship between the maximum stress and fatigue life was fitted. The cracking mechanism was analyzed by scanning electron microscopy. The crack source, expansion region, and eventual failure region appears significantly in the microscopic structure. Fatigue cracks initiate from microcracks on the strip surface. Microcosmic fatigue striations, secondary cracks, and macroscopic fatigue bay ridges are observed in the fatigue extension region. The eventual failure region meets the characteristics of tear edge morphology along with dimples.

引用

页码：780 / 786

页数：6

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