Effect Of Shot Peening On Fatigue Strength Of Maraging Steel
Author(s)
N. Kawagoishi, T. Nagano & M. Moriyama
Abstract
Effect of shot peening on fatigue strength of
maraging steel
N. ~awa~oishi', T. ~ a ~ a n o ~ & M. o r i ~ a r n a ~
I Faculty of Engineering, Kagoshima University, Kagoshima, Japan
2 Miyakonojyo National College of Technology, Miyakonojyo, Japan
Abstract
Rotating bendmg fatigue tests were carried out for a shot-peened maraging steel
in order to investigate the effects of shot peening on the fatigue strength and the
fracture mechanism focusing on the effect of surface roughness. Fatigue strength
was markedly improved by shot peening because of hardening and generation of
compressive residual stress in the surface layer. The origin of fatigue fracture
changed from the specimen surface at high stress levels to an inclusion in the
interior of specimen at low stress levels. And at the middle stress levels, both
fracture modes were observed. Consequently, the shape of the S-N curve of shotpeened
specimen was complex, corresponding to the change of fracture mode. In
the region where surface fracture
Keywords
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