This study investigates the influence of different shot blasting processes,varying in shot blasting times and currents,on the surface residual stress of 60Si2Mn hot-rolled spring steel—a key material for high speed railway fastening system components.Employing S230 cast steel shots with a particle diameter of 0.6～0.7 mm,the research utilized an X-ray stress tester to measure the surface residual stress under diverse shot blasting conditions.The findings reveal that,following various shot blasting treatments,the surface residual stress of hot-rolled spring steel consistently manifests as compressive stress.Under scenarios where the shot blasting current remains constant while the shot blasting time decreases,or where the shot blasting time remains unchanged but the shot blasting current decreases,there is a reduction in the characteristic parameters of the residual stress field(maximum residual stress,depth corresponding to the maximum residual stress,and depth affected by the residual stress)as well as the full width at half maximum(the same layer depth).This reduction indicates a decrease in shot blasting effectiveness.The most optimal shot blasting effect is achieved with a 100%coverage rate,a shot blasting time of 16 s,and a shot blasting current of 50 A,resulting in maximized characteristic parameters of the residual stress field and full width at half maximum,signifying the most favorable shot blasting outcome.
fastening systems for high speed railway60Si2Mn hot-rolled spring steelshot blasting technologyshot blasting effectresidual stressfull width at half maximum
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