공구강의 고온 변형 거동 예측을 위한 모델 비교 연구 = Comparison Study of Prediction Models for Hot Deformation Behavior of Tool Steel

다국어 초록 (Multilingual Abstract)

High temperature flow behaviors of Fe-Cr-Mo-V-W-C tool steel were investigated using isothermal compression tests on a Gleeble simulator. The compressive test temperature was varied from 850 to 1,150℃ with the strain rate ranges of 0.05 and 10 s^-1. The maximum height reduction was 45%. The dynamic softening related to the dynamic recrystallization was observed during hot deformation. The constitutive model based on Arrhenius-typed equation with the Zener-Hollomon parameter was proposed to simulate the hot deformation behavior of Fe-Cr-Mo-V-W-C steel. An artificial neural network (ANN) model was also developed to compare with the constitutive model. It was concluded that the ANN model showed more accurate prediction compared with the constitutive model for describing the hot compressive behavior of Fe-Cr-Mo-V-W-C steel.
(Received June 18, 2018; Revised June 26, 2018; Accepted July 6, 2018)

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