Shot Peening To Prevent Stress Corr.cracking And Corr.fatigue Failures Of Austenitic Stainless Steel

Author:  Risch, K.
Source:  Conf Proc: ICSP-3, (p.141-148)
Doc ID:  1987087
Year of Publication:  1987
Abstract:  
In corrosive environments austenitic CrNi and CrNiMo stainless steels are normally used in their passive state where an extremely thin layer of surface oxide protects the material against active dissolution. Yet, under the combined action of tensile stresses and several media cracking as a form of localized corrosion may occur. Depending on whether the loading is applied in a monotonous, in practice mostly static, or in a cyclic way, the phenomena are referred to as stress corrosion cracking (SCC) or corrosion fatigue (CF), respectively. Under certain conditions, shot peening provides a useful and efficient means to prevent these types of damage by introducing internal compressive stresses into a zone immediately below the surface. The present paper demonstrates advantages and limitations of shot peening by some selected examples.