Influence Of Shot Peening On Fatigue And Corrosion Fatigue Behav.of An Austenitic-ferritic Stnls.stl

Author:  Muller, Verpoort, Gessinger
Source:  Conf Proc: ICSP-1, (p.479-484)
Doc ID:  1981033
Year of Publication:  1981
Abstract:  
The influence of shot peening on the air fatigue and corrosion fatigue behavior of an austenitic--ferritic stainless steel X3CrMnNiMo2664 has been studied. The air fatigue limit was only increased by 7% after shot peening, caused by work softening of the deformed surface layer. In a 4 N sodium chloride solution, having a p H of 2 and 80 deg C the corrosion fatigue limit of the steel examined was increased by 70% compared to the electrolytically polished state. This marked increase is due to a finer surface slip distribution caused by the interaction of bulk slip with the deformed surface layer. Shot peening also had an influence on the near surface microcrack growth. The compressive residual stress field leads to some sort of crack closure effect which lowers the crack growth rate. Descriptors: Austenitic stainless steels-- Mechanical properties; Shot peening; Corrosion fatigue; Salt water-- Environment; Fatigue limit