Title: EFFECTS OF ENVIRONMENTAL MEDIA ON HIGH CYCLE AND VERY-HIGH-CYCLE FATIGUE BEHAVIORS OF STRUCTURAL STEEL 40Cr
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 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 observa- tions 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.
Publication Year: 2009
Publication Date: 2009-11-20
Language: en
Type: article
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Cited By Count: 10
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