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Metadynamic recrystallization of Nb–V microalloyed steel during hot deformation

Published online by Cambridge University Press:  03 January 2017

Wen-fei Shen ,
Chi Zhang ,
Li-wen Zhang ,
Ying-nan Xia ,
Yi-feng Xu  and
Xin-hua Shi
Wen-fei Shen
Affiliation:
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116023, China
Chi Zhang
Affiliation:
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116023, China
Li-wen Zhang*
Affiliation:
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116023, China
Ying-nan Xia
Affiliation:
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116023, China
Yi-feng Xu
Affiliation:
Suxin Special Steel Group Co., Ltd., Suzhou 215151, China
Xin-hua Shi
Affiliation:
Suxin Special Steel Group Co., Ltd., Suzhou 215151, 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 Nb–V microalloyed nonquenched and tempered steel was investigated by isothermal hot compression tests on Gleeble-1500 thermal-mechanical simulator. Compression tests were performed using double hit schedules at temperatures of 1273–1423 K, strain rates of 0.01–5 s−1, initial grain sizes of 92–149 μm and an inter-pass time of 0.5–10 s. The experimental results show that MDRX softening fraction increases with the increasing of deformation temperature, strain rate, and inter-pass time, while it decreases with the increasing of initial grain size. Based on the experimental results, the MDRX softening fraction kinetic model and recrystallized grain size model of the tested steel was established. Besides, using the above mathematic models, a finite element model was built to simulate the MDRX process of the tested steel. The simulation results show good agreement with the experimental ones, which indicates that finite element method is an effective approach to analyze the MDRX behavior and the established that mathematic models of the tested steel are reliable and accurate.

Keywords

metadynamic recrystallizationNb–V microalloyed steelnonquenched and tempered steelhot compressionfinite element method
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 3 , 14 February 2017 , pp. 656 - 665
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Copyright
Copyright © Materials Research Society 2016 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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