Shot Peening Retards "fretting"

Author:  LeGuernic, Yves
Source:  Conf Proc: ICSP-4, (p.281-296)
Doc ID:  1990069
Year of Publication:  1990
Abstract:  
Controlled shot peening is well known to be very effective against metal fatigue. However, its effect in retarding or eliminating fretting is not as well understood. Fretting, a complex deterioration phenomenon caused by the small amplitude relative motion of two mating metallic surfaces against one another, is described and analysed. Fretting corrosion, fretting wear and fretting fatigue are discussed. Increases in contact area, compressive residual stresses, improved lubrication and high material hardness are beneficial to fretting performance whereas high contact pressures, lack of lubrication, increased motion amplitude and low harness are detrimental. The effects of controlled shot peening along these lines are investigated: 1. effect on contact area 5. lubricant retention 2. residual compressive stress 6. microcracks arrest 3. mating surface peak elasticity 7. cold work 4. debris removal 8. surface texture The applicability of shot peening to improve the fretting performance of carbon steels, alloy steels, stainless steels, Titanium alloys and Aluminum alloys is investigated and several case histories and experimental data compiled from various sources serve to illustrate the effectiveness of the process. Descriptors: Fretting corrosion; Fretting wear; Fretting fatigue; Residual compressive stress; Surface texture; Mating surfaces; Workhardening