MC carbides in the Hf containing Ni based superalloy MarM002
MC carbides in the Hf containing Ni based superalloy MarM002
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.
superalloy, carbides, MC, M23C6, (Ti, Ta)C, HfC, dendrite, solidification, miscibility gap
73-80
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Cama, H.
e99a9d4e-8420-4ca2-9df5-d9a8fd5ec698
Thomson, R.C.
8e9ac990-b234-488a-bc4d-1470a63ec93a
1997
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Cama, H.
e99a9d4e-8420-4ca2-9df5-d9a8fd5ec698
Thomson, R.C.
8e9ac990-b234-488a-bc4d-1470a63ec93a
Starink, M.J., Cama, H. and Thomson, R.C.
(1997)
MC carbides in the Hf containing Ni based superalloy MarM002.
Scripta Materialia, 38 (1), .
(doi:10.1016/S1359-6462(97)00409-0).
Abstract
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.
Text
Starink et al 1998.pdf
- Version of Record
Restricted to Repository staff only
Request a copy
More information
Published date: 1997
Keywords:
superalloy, carbides, MC, M23C6, (Ti, Ta)C, HfC, dendrite, solidification, miscibility gap
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 45352
URI: http://eprints.soton.ac.uk/id/eprint/45352
ISSN: 1359-6462
PURE UUID: 0231e8a1-8f6c-41ba-b533-8df95d5dd6c1
Catalogue record
Date deposited: 21 Mar 2007
Last modified: 15 Mar 2024 09:10
Export record
Altmetrics
Contributors
Author:
H. Cama
Author:
R.C. Thomson
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics