Effects of Cyclic Softening on Fatigue Crack Propagation Properties of Steel

被引：2

作者：

Yonezawa, Takayuki ^{[1
,2
]}

Mori, Takashige ^{[1
]}

Tsutsumi, Seiichiro ^{[2
]}

机构：

[1] Nippon Steel Corp Ltd, Futtsu, Chiba 2938511, Japan

[2] Osaka Univ, Grad Sch Engn, Osaka, Japan

来源：

TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN | 2023年 / 109卷 / 05期

关键词：

fatigue; fatigue crack propagation; cyclic softening; crack closure; cold-rolling; ferrite; ferrite-pearlite; BEHAVIOR; GROWTH; SIZE;

D O I：

10.2355/tetsutohagane.TETSU-2022-124

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

In this paper, the effect of cyclic softening properties on fatigue crack propagation behavior was investigated. Ferrite and ferrite-pearlite steels with different cyclic softening properties were produced by cold rolling process. The cold-rolled steels showed cyclic softening, and the cyclic softening rate increased as the cold reduction rate increased. As a result of fatigue crack propagation tests using CT specimens, the fatigue crack growth rate decreased with increasing the cold reduction rate. The crack growth rate and the cyclic softening rate showed a good correlation regardless of the microstructure. The cold-rolled steels showed crack closure/opening behavior, and the crack opening load increased with increasing cold reduction rate. In addition, the difference in fatigue crack propagation rates of cold-rolled steels was explained by effective stress intensity factor range. From these results, the decrease of fatigue crack growth by cold rolling was considered to be mainly due to the suppression of crack opening by cyclic softening near the fatigue crack tip.

引用

页码：429 / 437

页数：9

共 39 条

[1]

[Anonymous], 2011, 2241 JIS Z

[2] Fatigue crack deflection and branching behavior of low carbon steel under mechanically large grain condition [J].