Critical Strain for the Initiation of Dynamic Recrystallization in a Ni-Fe Base Alloy

Young-Sang Na; Young Mok Rhyim; J.Y. Lee; Jae Ho Lee

doi:10.4028/www.scientific.net/MSF.449-452.577

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HomeMaterials Science ForumMaterials Science Forum Vols. 449-452Critical Strain for the Initiation of Dynamic...

Critical Strain for the Initiation of Dynamic Recrystallization in a Ni-Fe Base Alloy

Abstract:

In order to quantitatively analyze the critical strain for the initiation of dynamic recrystallization in Ni-Fe-based Alloy 718, a series of uniaxial compression tests was conducted in the temperature range 927°C - 1066°C and the strain rate range 5 x 10^-4 s^-1 - 5 s^-1 with varying initial grain size. The critical strains were graphically determined based on one parameter approach and microscopically confirmed. The effect of γ'' (matrix-hardening phase) and δ (grain boundary phase)on the critical strain was simply discussed. The constitutive model for the critical strain of Alloy 718 was constructed using the experimental data obtained from the higher strain rate and the temperature range between 940°C and 1040°C.

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Periodical:

Materials Science Forum (Volumes 449-452)

Pages:

577-580

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.449-452.577

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Online since:

March 2004

Authors:

Young-Sang Na, Young Mok Rhyim, J.Y. Lee, Jae Ho Lee

Keywords:

Alloy 718, Critical Strain, Dynamic Recrystallization (DRX), Ni-Fe Base Superalloy, One Parameter Approach

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