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. 。
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.
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