Influence of shot peening on superficial yield strength of spring steel in hard state

Abstract

The yield strength of a metallic technological surface with biaxial residual stresses may be determined using X-ray stress analysis techniques. Shot peening can increase the superficial proof stresses of a spring steel treated in the hard state, even though there is a considerable decrease in the half width of the X-ray diffraction profile. It can therefore be concluded that for a metallic material in the hard state, the half width parameter of the X -ray interference lines at the surface does not correctly reflect static strength.