Title :
Carbon migration in a bearing steel with spheroidal cementite subjected to ultrasonic nanocrystalline surface modification
Author :
Jun, T.J. ; Cho, I.S. ; Amanov, A. ; Ahn, D.G. ; Shin, K.S. ; Lee, C.S. ; Park, I.G.
Author_Institution :
Dept. of Hybrid Eng., Sun Moon Univ., Asan, South Korea
Abstract :
This paper deals with bearing steel with spheroidal cementite dispersed in a ferrite matrix subjected to ultrasonic nanocrystalline surface modification (UNSM) treatment. Carbon migration microstructure development, including grain size refinement and dissolution of cementite, was studied utilizing electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). Accumulated multiple gliding progressively refines cementite into nano-sized cementite particles mixed within ferrite nano-grains in the top surface layer. A decreasing volume fraction of cementite is observed with increasing depth in the top deformed layer, indicative of dissolution of cementite induced by plastic deformation.
Keywords :
diffusion; dissolving; electron backscattering; electron diffraction; grain refinement; grain size; nanoparticles; plastic deformation; steel; surface treatment; transmission electron microscopy; ultrasonic effects; TEM; accumulated multiple gliding; bearing steel; carbon migration; dissolution; electron backscatter diffraction; ferrite matrix; grain size refinement; nanosized particles; plastic deformation; spheroidal cementite; transmission electron microscopy; ultrasonic nanocrystalline surface modification; volume fraction; Carbon; Facsimile; Ferrites; Microstructure; Surface treatment; Transmission electron microscopy;
Conference_Titel :
Nanotechnology Materials and Devices Conference (NMDC), 2011 IEEE
Conference_Location :
Jeju
Print_ISBN :
978-1-4577-2139-7
DOI :
10.1109/NMDC.2011.6155287
