Enhancement of High Strength Steel Endurance, Application to Automotive Transmission Components Using a New Type of Ceramic S

Author:  F-X Abadie, G.P. Marconi, E. Morgano
Source:  Conf Proc 2011: ICSP-11 South Bend, IN USA (pgs. 31-36)
Doc ID:  2011005
Year of Publication:  2011
Abstract:  
Abstract With the first generation of ceramic shot it has been proven in industrial use that deeper residual stresses together with outstanding surface condition and very high level of compressive stress at the surface bring both higher fatigue performance and industrial benefits by reducing or even removing operations such as 2nd peening or surface conditioning [1, 2, 3]. A major European car manufacturer (3) has conducted tests and succeeded to improve the fatigue strength of actual automotive gears from their current production with industrial equipment using a new type of ceramic shot (1) by single peening operations with incredibly low use of energy, therefore significantly dropping the operating costs and enhancing the production output capability. The car manufacturer requirements, the new ceramic shot characteristics and properties, the main features of operation design, measurement and test methods by an independent surface engineering and peening service company (2), the fatigue testing and results by the car manufacturer are described. Key Words Fatigue life, fatigue strength, high strength steel, ceramic shot, steel shot, gear, shot peening, dual shot peening, residual stress, X-ray diffraction, surface condition.