Stress and hardness in surface layers of shot-peened steels

摘要

The main goal of the research is to study gradients of stresses and hardness in surface layer after shot peening and to look for correlations between these quantities, and this way to contribute to understanding of the onset of residual stress formation in engineering materials. X-ray diffraction was applied as a main technique for microscopic and macro-scopic residual stress determination. Combination of X-ray diffraction with electrolytic pol-ishing enables to study the depth profile of aforesaid quantities. Indentation on polished cross sections was used to study hardness depth profiles. It could be state that the shot peening produce the compressive macrostresses and the depth of the compressive layer is primarily influenced by intensity of blasting.