Precipitation Behavior of Ni-Cr-22 Fe-18 Mo (Hastelloy-X) and Ni-Cr-22 Co-12 Mo (Inconel-617) After Isothermal Aging

Hermann Kirchh&ouml;fer; Florian Schubert; Hubertus Nickel

doi:dx.doi.org/10.13182/NT84-A33462

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Precipitation Behavior of Ni-Cr-22 Fe-18 Mo (Hastelloy-X) and Ni-Cr-22 Co-12 Mo (Inconel-617) After Isothermal Aging

Hermann Kirchhöfer, Florian Schubert, Hubertus Nickel

Nuclear Technology / Volume 66 / Number 1 / July 1984 / Pages 139-148

B. Structural Characterization of Microstructure and Matallographical Aspect / Status of Metallic Materials Development for Application in Advanced High-Temperature Gas-Cooled Reactor / Material / dx.doi.org/10.13182/NT84-A33462

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The precipitation behavior of the nickel-base alloys Ni-Cr-22 Fe-18 Mo (Hastelloy-X) and Ni-Cr-22 Co-12 Mo (Inconel-617) has been investigated as a function of aging temperature. Hastelloy-X shows that M₆C and TiN are primary precipitates and M₁₂C, A₃B₂ (≈ Fe₃Mo₂), and M₂₃C₆ are secondary precipitates, while Inconel-617 also has M₆C and TiN as primary precipitates and M₂₃C₆, M₁₂C, and Ni₃AlTi as secondary precipitates. The characterization has been carried out by metallographic and transmission electron microscopy investigations and by x-ray examinations of electrochemical isolated precipitates.