Title: The study on kinetics of metadynamic recrystallisation of a Nb-V microalloyed non-quenched and tempered steel

Authors: Liwen Zhang; Wenfei Shen; Chi Zhang; Yingnan Xia; Xinhua Shi; Fei Xia

Addresses: School of Materials Science and Engineering, Dalian University of Technology, Dalian 116023, China ' School of Materials Science and Engineering, Dalian University of Technology, Dalian 116023, China ' School of Materials Science and Engineering, Dalian University of Technology, Dalian 116023, China ' School of Materials Science and Engineering, Dalian University of Technology, Dalian 116023, China ' Suxin Special Steel Group Co., Ltd., Suzhou 215151, China ' Suxin Special Steel Group Co., Ltd., Suzhou 215151, China

Abstract: The metadynamic recrystallisation (MDRX) behaviour of a Nb-V microalloyed non-quenched 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 1,273-1,423 K, strain rates of 0.01-5 s−1, initial grain sizes of 92-149 μm and inter-pass time of 0.5-10 s. The effects of deformation parameters, including deformation temperature, strain rate, initial grain size and inter-pass time, on MDRX softening fraction were analysed. The experimental results show that MDRX softening fraction increases with the increase of deformation temperature, strain rate and inter-pass time, while it decreases with the increase of initial grain size. Based on the experimental results, the kinetic model of MDRX for the tested steel was established. A good agreement between the experimental and predicted MDRX softening fraction indicates that the established kinetic model can precisely predict the MDRX softening fraction for the tested steel.

Keywords: metadynamic recrystallisation; MDRX; Nb-V microalloyed steel; non-quenched and tempered steel; hot compression.

DOI: 10.1504/IJCMSSE.2020.107395

International Journal of Computational Materials Science and Surface Engineering, 2020 Vol.9 No.1, pp.22 - 37

Accepted: 24 Oct 2019
Published online: 22 May 2020 *

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