The effects of several variables on pitting fatigue life of carburized steels were analyzed using a geared roller test machine (GRTM). The material variables that were primarily used to influence retained austenite include aim surface carbon concentration (0.8 % and 0.95 %), alloy (SAE 4320 and a modified SAE 4122), and cold treatment (performed on one material condition per alloy). Testing variables included contact stress in addition to a variation in lambda ratio (oil film thickness/surface roughness), arising from variation in roughness among the machined surfaces. Test results are presented, and differences in performance are considered in terms of material and testing variables. A primary observation from these results is an improvement in contact fatigue resistance apparently arising from cold-treatment and the associated reduction of retained austenite at the surface.
Examination of Pitting Fatigue in Carburized Steels with Controlled Retained Austenite Fractions
Sae Technical Papers
SAE 2006 World Congress & Exhibition ; 2006
2006-04-03
Conference paper
English
Examination of pitting fatigue in carburized steels with controlled retained austenite fractions
Automotive engineering | 2006
|Influence of Retained Austenite on Fatigue Performance of Carburized Gears
SAE Technical Papers | 2019
|Influence of Retained Austenite on Fatigue Performance of Carburized Gears
British Library Conference Proceedings | 2019
|Effect of retained austenite on the fatigue strength of carburized steel
Tema Archive | 1980
|SAE Technical Papers | 2008
|