Fatigue behavior of 42CrMo steel and 40Cr in the very high cycle regime
The S-N curves of 42CrMo steel and 40Cr steel between 104 and 1010 cycles were obtained by ultrasonic fatigue testing at a frequency of 20kHz.The results show that the S-N curve of 42CrMo steel displays the characteristic of the multi -stage type and the S-N curve of 40Cr steel displays the characteristic of continually decreasing type up to 1010 cycles.Both steels exhibit no fatigue limit of conventional fatigue curve.The S-N curve under ultrasonic fatigue loading can be described with the equation of Basquin.The fatigue strength in 109 cycles has dropped by nearly 40％ than that in 107 cycles.Compared to the S-N curve of 42CrMo and 40Cr steel,the results illustrate that the fatigue life of 42CrMo steel is much higher than that of 40Cr steel in ultra-high regime,the S-N curves of both steels are basically a coincidence in high-cycle stage,the S-N curve of 42CrMo steel is significantly delayed in ultra-high-cycle stage,Mo alloy element has no effect on the high-cycle fatigue property of steel,but Mo alloy element has an impact on the ultra-high cycle fatigue property of steel.As this result,the ultra-high cycle fatigue property of steels can be improved by adding Mo alloy element in the steel.The effect of Mo on the ultra-high cycle fatigue property of steels can be explained with the micro mechanism called enrichment of interstitial atom.
42CrMo steel 40Cr steel Mo alloy element Ultrasonic fatigue Fatigue strength
Weiwei Tang Hong Wang Zhenyuan Zhang
School of Mechanics and Engineering,Southwest Jiaotong University,Chengdu 610031,China Sichuan College of Architectural Technology,Deyang 618000,China
国际会议
成都
英文
261-264
2009-10-16（万方平台首次上网日期，不代表论文的发表时间）