Authors: Masanori Seki Masahiro Fujii Yuji Kobayashi Masaaki Sato Akira Yoshida
Publish Date: 2010/03/02
Volume: 24, Issue: 1, Pages: 141-144
Abstract
To investigate the influence of shot peening on the surface durability of powderforged rollers the casehardened powderforged rollers with a forging density of 75 g/cm3 treated by the single shot peening and the double shot peening were fatiguetested under a slidingrolling contact condition The surface roughness the surface hardness and the surface compressive residual stress of the rollers were increased by the shot peening In addition the pores near the roller surface were deformed by the shot peening The failure mode of all the test rollers was spalling due to subsurface cracking The fatigue lives of all the test rollers were improved by the shot peening and that of the test roller S08 which was shotpeened with the hardest steel shots in this experimental range was especially improved The surface durability of the test roller S08 was also most improved by the shot peening Cracks became difficult to occur and propagate under the roller surface since the pores near the roller surface were deformed by the stronger shot peening In this study double shot peening which generally restrains the increase in surface roughness was not particularly effective for the improvement in the surface durability of the powderforged rollers because the influence of tangential force on fatigue was not always great in a case of subsurface crackingMasanori Seki received his BS and MS in Mechanical Engineering from Okayama University Japan in 1997 and 1999 respectively After that he gained a position as Research Associate at Okayama University in 1999 Then he received his PhD degree from Osaka University in 2005 Dr Seki is currently an Assistant Professor at Okayama University in Okayama Japan His research interests include machine design and tribology
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