Author(s)

N. Hasegawa & Y. Watanabe

Abstract

A study was made of the effect of shot peening on the delayed fracture of carburized steel. The magnitude of diffusible hydrogen was measured by gas chromatographic apparatus for shot-peened and non-peened specimens. In addition, delayed fracture tests were conducted to obtain critical diffusible hydrogen. It was confirmed that the delayed fracture resistance of each peened specimen was improved compared with that of carburized specimens due to a decrease in the magnitude of diffusible hydrogen. Furthermore, the critical diffusible hydrogen of shot-peened specimens was higher than that of non-peened specimens. The mainly reason of this effect is considered that the increased dislocation induced by shot peening will trap diffused

Keywords