Abstract: In this study, the effects of different micro-shot peening processes on the surface properties and fatigue strength of EA4T axle steel were stu-died. Based on the 9 kinds of different shot peening intensities or coverages (mainly determined by shot peening time), the roughness, surface morphology, residual stress, full width at half maxima (FWHM) and surface grain size of EA4T axle steel were investigated. In addition, the fatigue test was carried out to obtain the fatigue limit of each process, and the fracture morphologies of the samples were carefully analyzed. After micro-shot peening treatment, an influence layer of approximately 100 μm deep was observed on the surface of EA4T axle steel. When a higher shot peening intensity was applied, the surface roughness usually increased. Under the same shot peening intensity, surface roughness is smaller when the shot peening time is 20 s. Shot peening intensity and coverage have little influence on the residual stress maximum but have a dramatic effect on the depth of residual stress layer. After shot peening, the surface FWHM value is the largest and this parameter gradually decreases in the depth direction. The greater the shot peening intensity, the deeper the FWHM influence layer. As the shot peening intensity and cove-rage increase, the surface grain size of the micro-shot peening sample would decrease. Fatigue cracks of all micro-shot peening specimens were initiated at the surface. Different micro-shot peening processes have different effects on the surface properties of EA4T axle steel, but all the micro-shot peening processes have a significant benefit in improving the fatigue limit.
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2020, Vol. 34 
