Journal
MATERIALS SCIENCE AND TECHNOLOGY
Volume 24, Issue 10, Pages 1245-1249Publisher
MANEY PUBLISHING
DOI: 10.1179/174328407X168955
Keywords
Nickel base alloy; gamma ' phase; LSW theory; Carbide; Decomposition
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The microstructure evolution of a conventionally cast nickel base superalloy has been investigated during aging treatment at 900 degrees C. It shows that two kinds of gamma ' particles existed in the as heat specimens. The finer spherical gamma ' ones became notably coarsening. The coarsening kinetics can be approximated by a linear volumetric growth as predicted by LSW theory. The larger cubic gamma ' ones sphericised and grew at the expense of finer ones. The primary MC decomposition course was shown in detail, which occurred by the formation of gamma ' films, Cr rich M(23)C(6) and Mo rich M(6)C.
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