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Volume 5, Issue 6 (Suppl) J Mat. Sci.
ISSN: 2321-6212 Advanced Materials 2017
October 26-28, 2017
OCTOBER 26-28, 2017 OSAKA, JAPAN
13TH INTERNATIONAL CONFERENCE ON
Advanced Materials and Nanotechnology
Evolution of microstructure of CSM345 steel from the surface to the interior of multifunction cavitation
Daichi Shimonishi, Daisuke Nakagawa, Masataka Ijiri, Kumiko Tanaka and Toshihiko Yoshimura
Tokyo University of Science, Japan
The hardness and microstructure at and just below the surface of Cr-Mo steel processed by a combination of Water Jet
Cavitation (WJC) and ultrasonic cavitation, which we call Multifunction Cavitation (MFC), were investigated using
scanning electron microscopy and micro Vickers hardness testing. Moreover, we also investigated the dependence of the
microstructure and hardness on the MFC processing time and compared the results to those for WJC. MFC processing
improved the corrosion resistance of the specimen surface and both WJC and MFC converted the tensile residual stress into
compressive residual stress. Regarding the microstructure of the WJC-processed specimen, protrusion and disappearance of
cementite from pearlite grains were observed at the specimen surface. Voids and cracks tended to occur at depths of 0.5-1 mm
from the surface, but were not observed at depths of 2-3 mm. For the MFC-processed specimen, a precursor that results in the
formation of spherical cementite inside pearlite grains was observed at the specimen surface and cementite spheroidization
was observed at depths of 0.5-1 mm below the surface. Voids and cracks were not observed within the specimen.
Biography
Daichi Shimonishi has completed his Bachelor of Engineering at National Institute of Technology, Ube College. Currently, he is Senior in Tokyo University of
Science, Yamaguchi.
Daichi Shimonishi et al., J Mat. Sci. 2017, 5:6
DOI: 10.4172/2321-6212-C1-009