Abstract
A GPM-30 fatigue machine was used to investigate the influence of surface ultrasonic rolling (SURT) on the rolling contact fatigue (RCF) life of D2 wheel steel. The experimental results present that the RCF life of the grinding processing sample is 4.1 × 105 cycles. During the RCF process, the flaking of the fine grain layer and high surface roughness of the grinding processing sample cause the production of RCF cracks. When the samples are treated by SURT with 0.2 MPa and 0.4 MPa, the RCF life is 9.2 × 105 cycles and 9.6 × 105 cycles, respectively. After SURT, the surface roughness of the samples is reduced, and a certain thickness of gradient-plastic-deformation layer and a residual-compressive-stress layer are produced. These factors lead to the improvement of the RCF property. However, when the static pressure increases to 0.6 MPa during SURT, the RCF life of the sample is reduced during RCF testing. The micro-cracks, which are formed during SURT, become the crack source and cause the formation of RCF cracks, decreasing of the RCF life.
Highlights
During recent years, as the speed of high-speed trains has increased, the rolling contact fatigue (RCF) failure of wheel materials has become serious [1]
The EBSD results show that after surface ultrasonic rolling (SURT), a fine ferrite grain layer was formed on the sample surface
For the grinding processing sample, the interface between the fine ferrite grain layer and the core microstructure causes the flaking of the fine grain layer
Summary
As the speed of high-speed trains has increased, the rolling contact fatigue (RCF) failure of wheel materials has become serious [1]. According to the results of Bevan et al [2], the RCF of wheel materials is higher than other failure forms. During the operation process of high-speed trains, the wheel tread is subjected to cyclic stress. The cyclic stress results in local permanent cumulative damage. When the trains run a certain number of cycles, the wheel tread will produce severe plastic deformation causing ratcheting failure [3]. The RCF of wheel materials seriously affects the safety of train operation [4,5]
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