The Relation Between Shot Peening Conditions And Fatigue Strength Of Carburized Gears

Author:  Matsumoto, Suzuki, Okada
Source:  Conf Proc: ICSP-4, (p.455-464)
Doc ID:  1990090
Year of Publication:  1990
Abstract:  
The relation between shot peening conditions and fatigue strength of carburized gears was investigated. The fatigue strength of the gears closely corelated to arc height value and integral value of residual stress in the direction of depth. The total kinetic energy of shot is represented by arc height value. The kinetic energy makes retained austenite to change into martensite and produces compressive stress field. For that reason fatigue cracks are considered to be prevented from not only initiating but also propagating by the compressive stress. These results indicates that shot peening of higher arc height is more effective to improve fatigue properties of the carburized gears. Descriptors: Arc height; Residual stress; Carburizing; Gear; Fatigue; Crack; Retained austenite