环境介质对40Cr结构钢高周和超高周疲劳行为的影响

金属学报

2009, Vol. 45

Issue (11): 1356-1363

论文

本期目录 | 过刊浏览

环境介质对40Cr结构钢高周和超高周疲劳行为的影响

钱桂安; 洪友士

中国科学院力学研究所非线性力学国家重点实验室; 北京 100190

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

QIAN Gui'an; HONG Youshi

State Key Laboratory of Nonlinear Mechanics; Institute of Mechanics; Chinese Academy of Sciences; Beijing 100190

引用本文:

钱桂安洪友士. 环境介质对40Cr结构钢高周和超高周疲劳行为的影响[J]. 金属学报, 2009, 45(11): 1356-1363.
, . EFFECTS OF ENVIRONMENTAL MEDIA ON HIGH CYCLE AND VERY-HIGH-CYCLE FATIGUE BEHAVIORS OF STRUCTURAL STEEL 40Cr[J]. Acta Metall Sin, 2009, 45(11): 1356-1363.

全文: PDF(1380 KB)

摘要:

选用40Cr结构钢, 分别在空气、水和3.5%NaCl水溶液中进行旋转弯曲疲劳实验, 研究环境介质对该结构钢高周和超高周疲劳特性的影响. 结果表明, 40Cr钢在水环境中的疲劳强度比在空气中明显降低; 在3.5%NaCl水溶液环境中的疲劳强度比在水中低. 断面观察显示, 在水和3.5%NaCl水溶液中, 疲劳裂纹多源萌生; 在稳态扩展阶段, 裂纹沿晶界扩展并存在广泛分布的沿晶二次裂纹. 。

关键词 ： 40Cr结构钢, 超高周疲劳, 环境介质, 疲劳强度, 疲劳裂纹萌生

Abstract：

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 10⁷ 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-igh-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.

Key words： structural steel 40Cr very-high-cycle fatigue environmental media fatigue strength fatigue crack initiation

收稿日期: 2009-05-07

ZTFLH:

TG111.8

基金资助:

国家自然科学基金项目10772178, 10721202和10532070以及中国科学院知识创新工程重要方向项目KJCX2-YW-L07资助

作者简介: 钱桂安, 男, 1980年生, 博士生

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