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MC carbides in the Hf containing Ni based superalloy MarM002

Starink, M.J., Cama, H. and Thomson, R.C. (1997) MC carbides in the Hf containing Ni based superalloy MarM002 Scripta Materialia, 38, (1), pp. 73-80. (doi:10.1016/S1359-6462(97)00409-0).

Record type: Article


Unexposed MarM002 alloy turbine blades and blades exposed at 700-1000ºC for up to 250 days were studied by TEM, SEM, EDX and XRD. The shapes, distribution and compositions of the MC carbides do not vary significantly during exposure at 700 and 800ºC. All MC carbides contain significant amounts of Hf, Ta, Ti and W, and they are present with a very broad range of compositions. The latter is caused by a miscibility gap in the MC carbide phase which causes the formation of MC carbides to shift from Hf lean in the initial stages of solidification to Hf rich in the later stages. In the unexposed samples the Hf lean (Ti,Ta)C carbide is the most numerous one. The shape of the complex MC carbide diffraction peaks are explained semi-quantitatively on the basis of the compositional range of the MC carbides.

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Published date: 1997
Keywords: superalloy, carbides, MC, M23C6, (Ti, Ta)C, HfC, dendrite, solidification, miscibility gap
Organisations: Engineering Mats & Surface Engineerg Gp


Local EPrints ID: 45352
ISSN: 1359-6462
PURE UUID: 0231e8a1-8f6c-41ba-b533-8df95d5dd6c1

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Date deposited: 21 Mar 2007
Last modified: 17 Jul 2017 15:12

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Author: M.J. Starink
Author: H. Cama
Author: R.C. Thomson

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