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Ultrafine grain effect on pearlitic transformation in hypereutectoid steel

Published online by Cambridge University Press:  08 January 2013

Fu Liang Lian ,
Hong Ji Liu ,
Jun Jie Sun ,
Xue Jiao Sun ,
Sheng Wu Guo ,
Yong Ning Liu  and
Lin Xiu Du
Fu Liang Lian
Affiliation:
School of Materials Science, State Key Laboratory of Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China
Hong Ji Liu
Affiliation:
School of Materials Science, State Key Laboratory of Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China
Jun Jie Sun
Affiliation:
School of Materials Science, State Key Laboratory of Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China
Xue Jiao Sun
Affiliation:
School of Materials Science, State Key Laboratory of Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China
Sheng Wu Guo
Affiliation:
School of Materials Science, State Key Laboratory of Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China
Yong Ning Liu*
Affiliation:
School of Materials Science, State Key Laboratory of Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China
Lin Xiu Du
Affiliation:
State Key Laboratory of Rolling Technology and Automation, Northeastern University, Shenyang 110819, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: ynliu@mail.xjtu.edu.cn
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Abstract

Pearlitic transformation in an ultrafine-grained (UFG) hypereutectoid steel was investigated. The steel was a plain carbon steel containing 1.0 wt% C and very few other elements. The UFG samples were prepared by thermomechanical treatment, and an average grain size of approximately 1 μm was achieved. The pearlitic transformation was conducted by heating the UFG samples at 1023 K for different times and then cooling in air. A new pearlitic transformation phenomenon was observed: traditional lamellar pearlite can be observed only when the grain size increases to a dimension larger than approximately 4 μm, which is a critical value. When grain size is smaller than this value, the pearlitic transformation occurs in the form of divorced eutectoid, and the microstructure is the ferrite matrix with granular cementite. This research indicates that grain size has a great influence on pearlitic transformation by shortening the diffusion distance and increasing the diffusion rate of carbon atoms in the UFG steel.

Keywords

steelgrain sizephase transformation
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 5 , 14 March 2013 , pp. 757 - 765
Copyright
Copyright © Materials Research Society 2013

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