Very high cycle fatigue properties of high-strength spring steel 60SiCrV7

被引：11

作者：

Hui, W. J. ^{[1
]}

Zhou, C. ^{[2
]}

Zhang, Y. J. ^{[1
]}

Zhao, X. L. ^{[1
]}

Dong, H. ^{[3
]}

机构：

[1] Beijing Jiaotong Univ, Sch Mech Elect & Control Engn, Beijing, Peoples R China

[2] Shenhua Guohua Beijing Elect Power Res Inst Co Lt, Beijing, Peoples R China

[3] Cent Iron & Steel Res Inst, Beijing, Peoples R China

来源：

FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES | 2016年 / 39卷 / 09期

基金：

中国国家自然科学基金;

关键词：

fatigue strength; high-strength steel; hydrogen; inclusion; stress intensity range; very high cycle fatigue; LOW-ALLOY STEEL; HYDROGEN EMBRITTLEMENT; GIGACYCLE FATIGUE; FRACTURE-BEHAVIOR; CRACK INITIATION; BEARING STEEL; LIFE REGIME; MECHANISM; INCLUSIONS; FAILURE;

D O I：

10.1111/ffe.12409

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The very high cycle fatigue properties of spring steel 60SiCrV7 for automotive suspension system with different hydrogen contents were studied by using ultrasonic fatigue testing and fatigue crack growth testing. The results show that the S-N curves exhibit continuous drop of fatigue lives and no obvious horizontal line exists. Similar fracture surface features were observed for all the specimens that failed mainly from internal inclusions with surrounding granular bright facet (GBF). Fatigue strength decreases remarkably with increasing hydrogen content. The applied stress intensity factor range at the periphery of GBF Delta K-GBF is approximately proportional to 1/3 power of the square of GBF area. The average values of Delta K-GBF for uncharged specimens are close to crack growth threshold Delta K-th, which indicates that Delta K-GBF could be regarded as the threshold value governing the beginning of stable fatigue crack propagation. The increase of hydrogen content tends to reduce Delta K-GBF.

引用

页码：1081 / 1091

页数：11

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