Title: Development and Application of Heat-Conductor Technique for Single Crystal Components of Superalloys
Authors: Ma, Dexin
Zhou, Bin
Bührig-Polaczek, Andreas #
Issue Date: 4-Jul-2011
Publisher: Trans Tech Publications Ltd.
Host Document: Advanced Materials Research vol:278 pages:306-311
Conference: Euro Superalloys 2010
Abstract: During single crystal (SC) solidification in turbine blades of superalloys, grain defects
often form in the platform region with abrupt variation in cross-section. In order to reduce grain
defects induced by component geometries, a Heat Conductor (HC) technique was developed and
applied to the production of SC turbine blades. The corresponding ceramic shell moulds were
produced by a modified investment casting procedure. The heat conductors with excellent heat
conductivity were inserted close to the inner corners of the platform, to effectively extract the local
heat during directional solidification. Both computer simulation and temperature measurements
have shown that this technique is able to produce a clear improvement of the thermal condition in
the critical region of the components. The SC growth in the blade body can spread into the platform
more quickly before the melt at the extremity becomes deeply undercooled. Microstructure
investigations reveal a remarkable reduction in grain defect formation, providing confirmation of
the effectiveness of the HC technique in improving the casting quality of SC components.
ISSN: 1022-6680
Publication status: published
KU Leuven publication type: IC
Appears in Collections:Non-KU Leuven Association publications
# (joint) last author

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