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The kinetics and microstructural evolution during metadynamic recrystallization of medium carbon Cr–Ni–Mo alloyed steel

Published online by Cambridge University Press:  14 March 2017

Chi Zhang ,
Liwen Zhang ,
Wenfei Shen  and
Yingnan Xia
Chi Zhang
Affiliation:
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China; and State Key Lab of Rolling Technologies and Automation, Northeastern University, Shenyang 110819, China
Liwen Zhang*
Affiliation:
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
Wenfei Shen
Affiliation:
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
Yingnan Xia
Affiliation:
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
*
a) Address all correspondence to this author. e-mail: commat@mail.dlut.edu.cn
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Abstract

The metadynamic recrystallization (MDRX) behavior of a medium carbon Cr–Ni–Mo alloyed steel 34CrNiMo was investigated using two-stage hot compression test on a Gleeble thermal-mechanical simulator in the temperature range of 1273–1423 K, strain rate range of 0.1–5.0 s−1, and interval times of 0.5–5 s. The softening of the flow stress at the second stage of compression and microstructure observation confirm the occurrence of MDRX at the elevated temperatures within very short interval time. Then the MDRX softening fraction was calculated based on the flow stress curves. The results indicate that the MDRX softening fraction increased with increasing interval time, deformation temperature, and strain rate. The kinetics of MDRX softening behavior was established using Avrami equation and the apparent activation energy of MDRX for 34CrNiMo steel was evaluated as 93 kJ/mol. The predicted results show good agreements with the experimental ones, indicating the efficiency of proposed kinetics equation.

Keywords

medium carbon steelmetadynamic recrystallizationkinetics equationmicrostructural evolution
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 7 , 14 April 2017 , pp. 1367 - 1375
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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