Microstructure Evolution And Mechanical Proporties Of Sus 304 By Ultrasonic And Air Blast Shot Peening

Author:  Yu, Dong, Shin, Yoo, Jung, S.J. Kim, J.H. Kim
Source:  Conf Proc: ICSP-10 Tokyo, Japan 2008
Doc ID:  2008121
Year of Publication:  2008
Abstract:  
ABSTRACT The objective of this work is to investigate the evolution of microstructures and resulting mechanical properties in SUS304 stainless steel treated by air blast and ultrasonic shot peening. X-ray diffractometer, optical microscope, scanning electron microscope and transmission electron microscope with energy dispersive spectrometer were used for microstructure analyses. Microhardness and abrasive wear test were carried out for the determination of the mechanical properties. A nanostructured surface layer with grain size of ~ 20 nm and mechanical twin were observed after shot peening. As the depth into the matrix increases, the multidirectional mechanical twins were gradually replaced by single-direction twins. The