Fatigue Strength Of Gear Steels Shot Peened In Extremely High Intensity Conditions

Author:  Adachi, S.
Source:  Conf Proc: ICSP-4, (p.363-372)
Doc ID:  1990032
Year of Publication:  1990
For case hardened gear steels shot peening treatment in extremely high intensity conditions can generate the white etching layers in the surface region, which are recognized as the adiabatic shear bands. In this work the morphology and characteristics of the white layer was studied on the 600% hard peened specimen. It was revealed that the white layer has a half bowl shape. The effect of the white etching layers on fatigue strength and surface damage as pitting was also investigated by means of rotating beam fatigue tests and gear bench tester. Although no deletrious effects of the white layers was found in the fatigue tests, it should be avoided to form them on gear surface because of the possible risk of gear teeth chipping. Descriptors: Shot peening; Fatigue strength; Transmission gear; Adiabatic shear bands; Pitting; Surface damage; Residual stress

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