Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Hot Deformation Behavior of AISI 4340 using Constitutive Model and Processing Map

구성 모델과 공정 지도를 이용한 AISI 4340강의 고온 변형 거동

  • Kim, Keunhak (Division of Advanced Materials Engineering, Chonbuk National University) ;
  • Jung, Minsu (Heat Treatment R&D Group, Korea Institute of Industrial Technology) ;
  • Lee, Seok-Jae (Division of Advanced Materials Engineering, Chonbuk National University)
  • 김근학 (전북대학교 신소재공학부) ;
  • 정민수 (한국생산기술연구원 열처리그룹) ;
  • 이석재 (전북대학교 신소재공학부)
  • Received : 2017.07.17
  • Accepted : 2017.08.03
  • Published : 2017.09.30
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Abstract

High temperature flow behaviors of AISI 4340 steel were investigated using isothermal compression tests under the temperature range from 850 to $1100^{\circ}C$ and a strain rate from 0.01 to $10s^{-1}$. The flow stress decreased with increasing compression temperature and decreasing strain rate. The dynamic softening related to the dynamic recrystallization was observed during hot deformation. The constitutive model based on Arrheniustyped equation with the Zener-Hollomon parameter was used to simulate the hot deformation behavior of AISI 4340 steel. The modification of the Zener-Hollomon parameter and lnA parameter resulted in the improvement of the calculation accuracy of the proposed constitutive model compared with the experimental flow curves. In addition, the process map of AISI 4340 steel was proposed. The instable process condition for hot deformation was predicted and its reliability was verified with the experimental observation.

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References

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