Optimisation of Carburising and Shot Peening, In Order To Improve Both Bending and Contact Fatigue Behaviour For Gear Applica

Author:  C Peyrac, J Flavenot
Source:  Conf Proc: ICSP-9 (pg 214-220)
Doc ID:  2005075
Year of Publication:  2005
Abstract:  
ABSTRACT Carburised steels are used extensively in the gear industry to improve the wear resistance of parts [1,2]. However, it is well known that shot peening, which creates compressive residual stress, increases the fatigue strength of materials. Combining these two treatments should therefore improve both the bending and contact fatigue strength [3,4,5]. This paper presents results obtained for bending fatigue and contact fatigue on a 17NiCrMo6-4 steel after carburising and shot peening. They demonstrate how it is possible to obtain a 50% to 70% improvement in the fatigue strength (bending fatigue) without affecting the fatigue contact behaviour. The resutls initially obtained on a test specimen are then confirmed by a test performed on gears that have received similar treatment.