Residual Stresses And Retained Austenite In Shot Peened Steels

Author:  Kirk, D.
Source:  Conf Proc: ICSP-1, (p.271-278)
Doc ID:  1981057
Year of Publication:  1981
Abstract:  
X-ray diffractometry has been used to examine the variation of residual stress across shot-peened surfaces, the transformation of austenite to martensite on peening and the decay of surface residual stress during fatigue testing of peened specimens. It is shown that masking gives rise to tensile surface residual stresses adjacent to the peened area. Peening of austenitic stainless steel produces surface martensite in amounts that depend upon the composition of the steel. Transformation of retained austenite on peening of carburized steel is found to give a substantial improvement in the surface and subsurface residual stresses. Shot-peened austenitic stainless steel is found to lose its compressive surface residual stress on fatigue testing at high levels of applied alternating stress. The fatigue and corrosion fatigue properties of the shot-peened stainless steel (321, 270, 247 and 233) are then found to be inferior to those of as-polished steel but are superior at lower stress levels. Descriptors: Austenitic stainless steels-- Mechanical properties; Shot peening; Residual stress; Retained austenite; Corrosion fatigue