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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2017.1
- 수록면
- 359 - 368 (10page)
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The compression deformation of 30Cr2Ni4MoV steel at different temperatures and strain rates is carried out onGleeble 1500 thermal mechanical simulation tester. Based on the experimental flow curves, the strainhardening rate curves (θ = dσ/dε versus σ) are derived, from which the characteristic stresses and strainsare identified. Meanwhile, the dependences of the characteristic stresses and strains on Zener-Hollomonparameter are determined and the results show that the value of the critical stress of dynamic recrystallization isclose to the value of the steady stress. With the aid of the experimental flow curves, the Avrami equation isemployed to describe the kinetics of dynamic recrystallization. The time exponent (n) is expressed as a powerlaw function of Zener-Hollomon parameter and the Avrami constant (k) is determined as a function of halfof the time for the complete dynamic recrystallization (t50). Furthermore, a constitutive model is presentedbased on the rule of mixtures when the dynamic recrystallization occurs. Validation of the constitutive model isimplemented and the simulated results agree well with the experimental results.
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