Effect of alloying chemistry on MC carbide morphology in modified RR2072 and RR2086 SX superalloys

The effect of minor additions (C and Hf) on the morphology of MC carbides in SX superalloys RR2072 and RR2086 has been investigated. It was found that the blocky MC particles contain a higher Hf level and have a larger MC/matrix interfacial misfit than the needle MC carbides. A simple calculation of...

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Bibliographic Details
Published in:Scripta materialia 2002-11, Vol.47 (10), p.669-675
Main Authors: Chen, Q.Z., Jones, C.N., Knowles, D.M.
Format: Article
Language:English
Subjects:
Applied sciences
Carbide
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Interface structure
Materials science
Metals. Metallurgy
Nickel alloys
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Precipitation
Single crystal
Solid-phase precipitation
Transition metals
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Summary:The effect of minor additions (C and Hf) on the morphology of MC carbides in SX superalloys RR2072 and RR2086 has been investigated. It was found that the blocky MC particles contain a higher Hf level and have a larger MC/matrix interfacial misfit than the needle MC carbides. A simple calculation of lattice parameters indicates that the higher Hf level in MC carbides makes them have a larger interfacial misfit, and that the large misfit energy makes them tend to be blocky.
ISSN:1359-6462
1872-8456
DOI:10.1016/S1359-6462(02)00266-X