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Advances in Materials Research
  Volume 3, Number 4, December 2014 , pages 217-225
DOI: https://doi.org/10.12989/amr.2014.3.4.217
 

Dynamic recrystallization and microstructure evolution of a Nb-V microalloyed forging steel during hot deformation
Yang Zhao, Liqing Chen and Xianghua Liu

 
Abstract
    In this study, a forging steel alloyed with both Nb and V was used as experimental material and the hot deformation behavior has been studied for this steel by conducting the compressive deformation test at temperature of 900-1150s-1s-1 in a MMS-300 thermo-mechanical simulator. The microstructure evolution, particularly the dynamically recrystallized microstructure, of the experimental steel at elevated temperatures, strain rates and strain levels, was characterized by optical microstructural observation and the constitutive equation in association with the activation energy and Zener-Hollomon parameter. The curves of strain hardening rate versus stress were used to determine the critical strain and peak strain, and their relation was connected with Zener-Hollomon parameter. Under the conditions of processing temperature 900 ocand strain rate 0.01 s-1, the dynamic recrystallization took place and the austenite grain size was refined from 164.5 µm to 28.9 µm.
 
Key Words
    Nb-V microalloyed forging steel; dynamic recrystallization; microstructure evolution; constitutive equation; activation energy
 
Address
Yang Zhao: School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China

Liqing Chen: State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China

Xianghua Liu: Research Institute of Science and Technology, Northeastern University, Shenyang 110819, China
 

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