Epsilon and Eta Phases Precipitated in an Fe-38Ni-13Co-4.7Nb-1.5Ti-0.4Si Superalloy

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An Fe-38Ni-13Co-4.7Nb-1.5Ti-0.5Si alloy is a controlled low thermal expansion superalloy with a good resistance to SAGBO (Stress Accelerated Grain Boundary Oxidation) embrittlement at elevated temperatures by an intensional Si addition. The precipitation of second phases, ε phase, η phase and so on, in this superalloy is investigated by means of optical microscopy, scanning electron microscopy, transmission electron microscopy, and X-ray diffractometry. A time-temperature-transformation diagram for the ε phase is presented.The crystal structure and the lattice parameters of the ε phase and the orientation relationship with the alloy matrix g are determined. It is shown that the η phase is not a stable phase as well as γ' phase, but cellular η phase is the most stable precipitation phase in this alloy.

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  • ISIJ international  

    ISIJ international 37(1), 80-86, 1997-01-15 

    The Iron and Steel Institute of Japan

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