Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Assessment of Hot Deformation and Grain Size Distribution in a Udimet 720Li Pancake

Udimet 720Li 합금의 고온변형 및 결정립분포 예측

  • 염종택 (한국기계연구원 재료기술연구소 공정연구부) ;
  • 나영상 (한국기계연구원 재료기술연구소 공정연구부) ;
  • 박노광 (한국기계연구원 재료기술연구소 공정연구부)
  • Published : 2002.10.01
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Abstract

Hot deformation behavior of Udiment720Li was characterized by compression tests in the temperature range of 10$25^{\circ}C$ to 115$0^{\circ}C$ and the strain rate range of $0.0005 s^{-1};to;5 s^{-1}$. The combination of dynamic material model (DMM) and Ziegler's instability criterion was applied to predict an optimum condition and unstable regions for hot forming. A dynamic recrystallization model coupled with FEM results was used to interpret the evolution of microstructures. In order to verify the reliability of the present coupled model, isothermal forging was performed in the temperature range 1050~115$0^{\circ}C$ at strain rates of $0.05 s^{-1};and;0.005 s^{-1}$. The present model was successfully applied to the hot forming process of Udimet720Li.

Keywords

References

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