Contact Fatigue Tests and Contact Fatigue Life Analysis

Lin, Hong; Binoniemi, Robert R.; Fett, Gregory A.; Deis, Mick

doi:10.4271/2005-01-0795

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“…Low elastohydrodynamic (EHD) lubrication has been shown to lead to scuffing (6) and shortened pitting fatigue lives (7). Other factors like contact stress, geometric tolerances, and carburizing type can also affect pitting fatigue.…”

Section: Introductionmentioning

confidence: 99%

Examination of Pitting Fatigue in Carburized Steels with Controlled Retained Austenite Fractions

Wagar¹,

Speer²,

Matlock³

et al. 2006

SAE Technical Paper Series

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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.

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Section: Introductionmentioning

confidence: 99%