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Grain refinement and formation of ultrafine-grained microstructure in a low-carbon steel under electropulsing

Published online by Cambridge University Press:  31 January 2011

Yizhou Zhou ,
Wei Zhang ,
Baoquan Wang ,
Guanhu He  and
Jingdong Guo
Yizhou Zhou
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, Peoples Republic of China
Wei Zhang
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, Peoples Republic of China
Baoquan Wang
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, Peoples Republic of China
Guanhu He
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, Peoples Republic of China
Jingdong Guo*
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, Peoples Republic of China
*
a)Address all correspondence to this author.jdguo@imr.ac.cn
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Abstract

High current electropulsing was applied to a low-carbon steel in the solid state. The relationship between grain size and experimental conditions was revealed. It was found that the ultrafine-grained (UFG) microstructure could be formed when electric current density, heating rate, and cooling rate all were high. The UFG samples prepared by applying electropulsing were free of porosity and contamination, and had no large microstrain. Also, their tensile strength was dramatically enhanced over that of their coarse-grained counterparts, without a decrease in ductility. The mechanism for grain refinement and formation of the UFG microstructure was discussed. It is proposed that the effect of a decrease in thermodynamic barrier and enhancement of nucleation rate in a current-carrying system cannot be neglected.

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Articles
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Journal of Materials Research , Volume 17 , Issue 8 , August 2002 , pp. 2105 - 2111
Copyright
Copyright © Materials Research Society 2002

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