Creep of a Cobalt-Rich Nickel-Base Superalloy

The creep behavior of Ni-base superalloy (Ni--29Co--16Cr--6.6Al--5Mo--2.6Ti) was studied at 750 deg C in vacuum within the stress range of 400-650 MPa. The log--log plot of the steady-state creep rate vs. the stress shows a high slope of 13.3 which is the apparent applied stress exponent resulting f...

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Bibliographic Details
Published in:Scripta metallurgica et materialia 1990-11, Vol.24 (11), p.2203-2208
Main Authors: Merabtine, R, Bertrand, C, Dallas, J-P, Devaud-Rzepski, J, Trichet, M-F, Cornet, M
Format: Article
Language:English
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Summary:The creep behavior of Ni-base superalloy (Ni--29Co--16Cr--6.6Al--5Mo--2.6Ti) was studied at 750 deg C in vacuum within the stress range of 400-650 MPa. The log--log plot of the steady-state creep rate vs. the stress shows a high slope of 13.3 which is the apparent applied stress exponent resulting from gamma '-precipitates and high cobalt content. Transmission electron microscopy indicates that the plastic deformation originates from a combination of gliding pairs of perfect dislocations with antiphase boundary in the gamma '-phase and formation of stacking faults. A lower stacking fault energy is associated with incresing Co content. Graphs, Photomicrographs. 10 ref.--B.C.
ISSN:0956-716X