발간논문

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Vol.35, No.10, 1424 ~ 1434, 1997
Title
Assessment of Grain-Size Distribution in Hot Forged Alloy 718
염종택 , 김인수 , 박노광 Jong Taek Yum , In Soo Kim , Nho Kwang Park
Abstract
The microstructural evolution during a hot forging of Alloy 718 has been studied using compression tests and FEM simulation. The microstructures developed during a hot forging varied depending on dynamic recrystallization. The Zener-Holloman parameter(Z) measured as a function of temperature(T) and strain rate(ε˙) was given by Z=ε˙exp(447.706/RT). The size of dynamically recrystallized grains decreased as Z increased. The critical strain(ε_0) for the initiation of dynamic recrystallization was obtained from compression test and FEM simulation. The detailed variation of microstructures due to dynamic recrystallization could effectively be predicted at various locations in a forged pancake.
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