Abstract
The effects of environmental media on the corrosion fatigue fracture behavior of 25CrMo steel were investigated. The media include air, and 3.5 wt % and 5.0 wt % NaCl solutions. Experimental results indicate that the media induces the initiation of corrosion fatigue cracks at multiple sites. The multi-cracking sites cause changes in the crack growth directions, the crack growth rate during the coupling action of the media, and the stress amplitude. The coupling effects are important for engineering applications and research. The probability and predictions of the corrosion fatigue characteristic life can be estimated using the three-parameter Weibull distribution function.
Highlights
CrMo steels, including low and high alloy chromium steels, are structural steels that are used in key components and parts of critical engineering structures such as gears and axles
We investigate the corrosion fatigue behavior over 5×105-5×107 cycles for 25CrMo steel in air and 3.5 wt.% NaCl and 5.0 wt.% NaCl aqueous solutions
The S-N curves indicate that the effects of the environmental media on the fatigue fracture of 25CrMo steel are different
Summary
CrMo steels, including low and high alloy chromium steels, are structural steels that are used in key components and parts of critical engineering structures such as gears and axles. Beretta S. et al modified Murtaza and Akid’s model in order to obtain the description of corrosion–fatigue crack growth data allowing us to obtain a conservative prediction of the S–N diagram subjected to artificial rainwater These works confirmed or verified that the present study is very important, especially the reliability analysis of corrosion fatigue data of high speed railway axle [11]. The interest in the application of low-alloy CrMo steels to railways [1] along with other modified methods and effect factors [18,19] have led to substantial research efforts focused on the fatigue, corrosive fatigue, high-temperature fatigue and enhanced fatigue resistance in the past decade. The microscopic fracture behavior is determined based on observations of the cross-sections of the fracture surfaces
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