EFFECTS OF ENVIRONMENTAL MEDIA ON HIGH CYCLE AND VERY-HIGH-CYCLE FATIGUE BEHAVIORS OF STRUCTURAL STEEL 40Cr

被引：0

作者：

Qian Gui'an ^{[1
]}

Hong Youshi ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China

来源：

ACTA METALLURGICA SINICA | 2009年 / 45卷 / 11期

基金：

中国国家自然科学基金;

关键词：

structural steel 40Cr; very-high-cycle fatigue; environmental media; fatigue strength; fatigue crack initiation; HIGH-STRENGTH STEELS; CHROMIUM-BEARING STEEL; S-N CHARACTERISTICS; LOW-ALLOY STEEL; CRACK INITIATION; HYDROGEN TRANSPORT; SPRING STEEL; PROPAGATION; REGIME; MECHANISM;

D O I：

暂无

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Very-high-cycle fatigue of metallic materials is commonly regarded as fatigue failure occurs at stress levels below conventional fatigue limit and the relevant fatigue lives are above 10(7) cyc. Rotary bending fatigue tests for a structural steel 40Cr were performed in laboratory air, fresh water and 3.5%NaCl aqueous solution, respectively, to investigate the influence of environmental media on fatigue behaviors of the steel in high cycle and very-high-cycle fatigue regimes. The results show that the fatigue strength of the steel in water is remarkably degraded compared with that in air, and the fatigue strength in 3.5%NaCl solution is even lower than that in water. The fracture surface observations show that for the specimens tested in water and 3.5%NaCl solution, multiple crack originations exist and cracks propagate along grain boundary with widespread secondary cracks in their steady propagation period.

引用

页码：1356 / 1363

页数：8

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