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Metals 2015, 5(4), 1971-1983; doi:10.3390/met5041971

Investigation of the Undercoolability of Ni-Based Alloys Using High Temperature Thermal Analysis

Foundry-Institute, Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen University, Intzestraße 5, 52072 Aachen, Germany
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Academic Editor: Johan Moverare
Received: 21 August 2015 / Revised: 16 October 2015 / Accepted: 20 October 2015 / Published: 26 October 2015
(This article belongs to the Special Issue Superalloys)
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Abstract

During the single crystal (SX) solidification of turbine blades, grain defects can form in the platform regions which have abruptly varying cross-sections. A high undercoolability of a Ni-based alloy prevents the growth of stray grains in the thermally undercooled platform area. To evaluate the undercoolability of different Ni-based alloys, temperature measurements were conducted using the same thermal conditions in an Al2O3-SiO2 investment casting shell mold system. Furthermore, the results were compared with stray grains in directionally solidified components. View Full-Text
Keywords: Ni-based; superalloys; undercooling; shell mold; temperature measurement; stray grains Ni-based; superalloys; undercooling; shell mold; temperature measurement; stray grains
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Bogner, S.; Ivanova, E.; Müller, M.; Wang, F.; Ma, D.; Bührig-Polaczek, A. Investigation of the Undercoolability of Ni-Based Alloys Using High Temperature Thermal Analysis. Metals 2015, 5, 1971-1983.

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