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Formation of Ultrafine Microstructure during Uniaxial Warm-Compressive Deformation in an Fe-0.67%C Steel for Railway Wheels

Published online by Cambridge University Press:  31 January 2011

Yuji Yasumoto ,
Kazuyuki Handa ,
Yoshisato Kimura  and
Yoshinao Mishima
Yuji Yasumoto
Affiliation:
yasumoto.y.aa@m.titech.ac.jp
Kazuyuki Handa
Affiliation:
khanda@rtri.or.jp, Railway Technical Research Institute, Tokyo, Japan
Yoshisato Kimura
Affiliation:
kimura.y.ac@m.titech.ac.jp, Tokyo Institute of Technology, MS&E, 4259-G3-23 Nagatsuta, midori-ku, Yokohama, 226-8502, Japan, +81-45-924-5157
Yoshinao Mishima
Affiliation:
mishima.y.ab@m.titech.ac.jp, Tokyo Institute of Technology, Yokohama, Japan
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Abstract

The evolution of microstructure in an Fe-0.67%C steel used for railway wheels has been investigated. To elucidate the mechanism of the ultrafine microstructure which is formed on the railway wheels tread surface, we have experimentally reproduced the same microstructure using uniaxial compressive deformation and subsequent annealing at 873 K. The deformation conditions required for ultrafine microstructure formation are the initial strain rate of 1 (=100) s-1 and total strain of 0.7. The mechanism of microstructural refinement is not the primary recrystallization but continuous recrystallization, i.e., the recovery process associated with the rearrangement of accumulated dislocations during deformation and annealing at temperatures between 773 K and 873 K. The recovery process never occurs at temperatures lower than 773 K. Primary recrystallization which involves the nucleation and growth of new ferrite grains takes place at temperatures higher than 873 K.

Keywords

Femicrostructuregrain size
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1225: Symposium HH – Multiscale Polycrystal Mechanics of Complex Microstructures , 2009 , 1225-HH03-06
Copyright
Copyright © Materials Research Society 2010

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