Improved Fatigue Life of a Carburized Gear by Shot Peening Parameter Optimization

Author:  R.P. Garibay, N.S. Chang
Source:  International Conference on Carburizing: Processing & Performance July-1989
Doc ID:  1989022
Year of Publication:  1989
Abstract:  
The effect of shot peening process parameters on fatigue life was investigated on a carburized helical gear. In most of the shot peening parameter optimization cases, once workpiece saturation has exceeded 100%, Almen intensity is the most dominant process parameter and, therefore, is optimized first. Gear tooth bending fatigue lives were evaluated as a function of Almen intensity. Bending fatigue resistance of a carburized gear, shot peened via optimizing Almen intensity, depends on the magnitude and distribution of peening induced compressive residual stresses below the surface and a balance between the benefits of residual stresses and surface damage.