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Title: 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
Publication year 2008
Document number: 2008121
Number of pages: 6
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
á’-martensite and very few M23C6 precipitates were observed after air blast shot peening. The deformation induced á’-martensite transformation appeared to occur in twin-twin
intersection only after ultrasonic shot peening. The microhardness increased due to deformation induced martensite transformation and nanocrystalline surface structure. The
improvement of wear properties after shot peening results from work hardening and nanocrystalline surface layer generation.
KEY WORDS
SUS304, Air blast shot peening, Ultrasonic shot peening, Nanocrystalline, Hardness, Abrasive wear
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This page last revised: 03/22/2010