Advances in materials Research

  • 제3권4호
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  • Pages.217-225
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  • 2014
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  • 2234-0912(pISSN)
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  • 2234-179X(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Dynamic recrystallization and microstructure evolution of a Nb-V microalloyed forging steel during hot deformation

  • Zhao, Yang (School of Materials and Metallurgy, Northeastern University) ;
  • Chen, Liqing (State Key Laboratory of Rolling and Automation, Northeastern University) ;
  • Liu, Xianghua (Research Institute of Science and Technology, Northeastern University)
  • 투고 : 2014.06.17
  • 심사 : 2014.12.27
  • 발행 : 2014.12.25
⟨ 이전 논문 다음 논문 ⟩

초록

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 $900-1150^{\circ}C$ and strain rate of $0.01-0.01s^{-1}$ 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 $900^{\circ}C$ and strain rate $0.01s^{-1}$, the dynamic recrystallization took place and the austenite grain size was refined from $164.5{\mu}m$ to $28.9{\mu}m$.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of China

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