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- E-ISSN 2288-8985
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- P-ISSN1225-0163
- E-ISSN2288-8985
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The High Temperature Deformation Behavior of the Wrought Superalloy 718
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1996, v.9 no.2, pp.179-191
Na,
Y., Choe,
S., &
Kim,
H.
(1996). The High Temperature Deformation Behavior of the Wrought Superalloy 718. Analytical Science and Technology, 9(2), 179-191.
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Abstract
In order to understand the high temperature deformation behavior of superalloy 718, a rotating grade 718 alloy has been compression tested to about 0.7 upset ratio at <TEX>$927{\sim}1066^{\circ}C$</TEX> temperature range and <TEX>$5{\times}10^{-4}{\sim}5{\times}10^0sec^{-1}$</TEX> strain rate. The maximum flow stress was increased with increasing strain rate, and similar behavior was observed with decreasing temperature. At low temperature and high strain rates other than <TEX>$5{\times}10^{-1}sec^{-1}$</TEX>, strain softening was occurred mainly by dynamic recovery and deformation twinning processes, while at high temperature and low strain rates strain softening was offseted by dynamic recrystallization. At <TEX>$5{\times}10^{-1}sec^{-1}$</TEX>, strain hardening was occurred due to work hardening of the dynamic recrystallized grains. Strain rate sensitivity, m, was varied with strain rates. In the case of lower strain rate tests, m was measured as 0.3 and it was observed that the deformation was mainly controlled by dynamic recrystallization. At higher strain rate, m was lowered to 0.1 and the deformation was controlled by the dynamic recovery and the deformation twinning processes.
- keywords
- Superalloy 718, dynamic recovery, dynamic recrystallization, defromation twin
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