A Study of Inclusions Causing Fatigue Cracks in Steels for Carburized and Shot Peened Gears

Author:  T. Toyoda, T. Kanazawa, K. Matsumoto
Source:  JSAE Review Vol.11 No. 1
Doc ID:  1990126
Year of Publication:  1990
Abstract:  
The fatigue fractures of carburized and shot peened gears tend to be caused by the non-metallic inclusions under the surface becaruse the fatigue strength of the surface of the gears is improved by shot peening operations. This paper discusses the quantitative relationship between the size and the locations of the inclusions, and the fatigue strength. The fatigue strength values were obtained by rotating bending fatigue tests of a newly developed clean steel for carburized gears. Also discusses is the clean steels remarkably improved fatigue strength.