Author(s)

A. Rossler & J.K. Gregory

Abstract

The bake hardening steel ZSTE 220 BH was shot peened to Almen intensities of 0.12, 0.17 and 0.27 mmA. Residual stress profiles were measured using x-ray diffraction. Specimens shot peened with 0.17 mmA were subsequently annealed at temperatures of up to 250 °C and the change in residual stress profiles was measured. While thermal residual stress decay was high at the surface, residual stresses below the surface were stable. This result is explained by invoking the strain aging effect as investigated in the tensile test. For a low degree of cold work, a pronounced strain aging effect stabilizes residual stresses at 170°C, while a high degree of cold work tends to eliminate the strain aging effect. 1 Introduction Mechanical surface treatments such as shot pee

Keywords