Development of heat conductor technique for single crystal components of superalloys

Authors: Ma, D.1; Bührig-Polaczek, A.2

Source: International Journal of Cast Metals Research, Volume 22, Number 6, December 2009 , pp. 422-429(8)

Publisher: Maney Publishing

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Abstract:

A new heat conductor (HC) technique was developed to minimise stray grain formation arising from the geometrical effect during single crystal solidification of superalloys. Graphite is recommended as HC material because of its excellent thermophysical properties. Computer simulation and temperature measurements have shown that this technique is able to produce a clear improvement of thermal condition in the critical region of the components. Both the extent and the period of undercooling at the platform extremity significantly decreased. Structural investigation revealed a notable reduction in stray grain quota, providing evidence for the effectiveness of the HC technique for improving the quality of single crystal components.

Keywords: HEAT CONDUCTOR; SUPERALLOY; SINGLE CRYSTAL; DIRECTIONAL SOLIDIFICATION

Document Type: Research article

DOI: 10.1179/174313309X449255

Affiliations: 1: Foundry Institute, RWTH University, Aachen, Germany;, Email: d.ma@gi.rwth-aachen.de 2: Foundry Institute, RWTH University, Aachen, Germany

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