The High Temperature Deformation Behavior of the Wrought Superalloy 718

Na, Y.S.; 나영상; Choe, S.J.; 최승주; Kim, H.M.; 김학민

P-ISSN1225-0163
E-ISSN2288-8985
SCOPUS, ESCI, KCI

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P-ISSN 1225-0163
E-ISSN 2288-8985

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Vol.9, No.2

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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.S.
Choe, S.J.
Kim, H.M.

Na, Y., Choe, S., & Kim, H. (1996). The High Temperature Deformation Behavior of the Wrought Superalloy 718. , 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.