Quantitative Assessment of Retained Austenite in SAF 2507 Dual Stainless Steel After Shot Peening

Author:  Ming Chen, Chuanhai Jiang, Xiaohu Chen
Source:  ICSP-13
Doc ID:  2017068
Year of Publication:  2017
Abstract:  
Introduction: Shot peening (SP) is a kind of cold working treatment, which is widely used in the automobile and aerospace industries to improve the fatigue life and surface strength of the component. The SP process is implemented by bombarding the surface of a metallic component with high velocity shots. [1-5]The compressive residual stress, grain refinement and deformation induced transformation induced by plastic strain in the shot peened material are well-known phenomenon. Several researchers have already focused their attention on the martensitic transformation in the material such as AISI 316L or AISI 304 austenite stainless steel after severe shot peening (SSP) [6]. The investigations on martensitic transformation mechanism were carried out mainly by means of transmission electron microscope. So most of the research is a qualitative analysis, and the quantitative analysis is inadequate. Amar et al [7] had reported a single X-ray diffraction method which was used to identify and evaluate deformation-induced transformation in 304 austenitic stainless steel. This technique enables simultaneous measurement of all the phases from a single XRD scan.