Abstract
The cantilever-type rotary bending test was performed at room temperature on high carbon chromium steel, preparing three kinds of specimens, fine particle bombarded, shot peened and untreated. Each specimen had a transition stress from surface fracture initiation to interior. The transition stress was higher for FPB specimen than for SP specimen, and the effect of surface treatment appeared at stress level more than the transition stress of untreated specimen. This effect seemed to disappear at lower stress level, although the features of fish-eye were different.
