Improving fatigue strength of bainite/martensite dual-phase steels in very high cycle fatigue regime by refining microstructures

Yangbo Liu; Shouxin Li; Zhengou Yang; Jingyu Cui; Jialin Gu; Bingzhe Bai

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Improving fatigue strength of bainite/martensite dual-phase steels in very high cycle fatigue regime by refining microstructures

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摘要

Very high cycle fatigue behaviors of two bainite/martensite dual-phase steels were investigated.One of the steels was cyclic rapid heat treated and its microstructures were refined. Fatigue strength of the steel is 225 MPa higher than that without refining.Observation of fracture surfaces show that the fatigue cracks initiate at bainites for non-refined steel and at non-metallic inclusions for the refined steel.The size of inclusions is much smaller than that of bainites which results in the improvement of fatigue strength.

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《力学快报：英文版》 |2012年第3期|15-18|共4页
作者
Yangbo Liu; Shouxin Li; Zhengou Yang; Jingyu Cui; Jialin Gu; Bingzhe Bai;
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作者单位

Shougang Research Institute of Technology;

Beijing 100043;

China;

Shenyang National Laboratory for Materials Science;

Institute of Metal Research;

Chinese Academy of Sciences;

Shenyang 110016;

China;

Laboratory of Advanced Materials;

Department of Materials Science and Engineering;

Tsinghua University;

Beijing 100084;

China;

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原文格式 PDF
正文语种 chi
中图分类疲劳强度问题;
关键词
疲劳强度; 循环疲劳; 微观结构; 双相钢; 贝氏体; 马氏体; 非金属夹杂物; 炼油;

Improving fatigue strength of bainite/martensite dual-phase steels in very high cycle fatigue regime by refining microstructures

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