Abstract
This paper explores the thermomechanical treatment consisting of shot peening and heating applied to carbon steel, and the effects on surface characteristics and fatigue characteristics. Shot peening was performed with an air-type machine using cast steel balls. Hardness and compressive residual stress in the re-shot-peened workpieces were measured. In all cases of re-shot-peened workpieces, maximum hardness was greater than that obtained in the initial process only. For all workpieces subjected to heat treatment, improvement of fatigue life was found in the workpieces subjected to initial processing only. The surface characteristics of the peened carbon steel were improved by heating and subsequent re-shot peening.
