Effect of Austenite Stability on Phase Transformation and Fatigue Performance of Stainless Steels after Various Mechanical Su

Author:  Wollmann, Mhaede, Wanger
Source:  Conf Proc 2011: ICSP-11 South Bend, IN USA (pgs. 285-290)
Doc ID:  2011047
Year of Publication:  2011
Abstract:  
Abstract Metastable austenitic stainless steels are known to stress-induced martensitically transform during cold working. Two austenitic stainless steels; AISI 304 and AISI 316Ti, which differ with regard to their austenite stability due to their chemical composition were chosen for the present investigation. Cold rolling to various degrees was done and the transformation to martensite was recorded in both alloys by X-ray diffraction spectra. Shot peening (SP) and ball-burnishing (BB) were applied and the resulting changes in near-surface properties were characterized by micro-hardness depth profiles and residual stress-depth profiles. The shot peening and ball-burnishing caused changes in high cycle fatigue (HCF) performance of the two alloys with different austenite stability will be compared and contrasted. Keywords: Austenitic stainless steel, shot peening, ball-burnishing, strain-induced martensitic transformation, X-ray diffraction patterns