A New Tantalum Strengthened Alloy for Flying Gasturbines
- Dr. P. J. Winkler
Published Online: 23 DEC 2005
Copyright © 2000 Wiley-VCH Verlag GmbH, Weinheim
Materials for Transportation Technology, Volume 1
How to Cite
Brill, U. (2000) A New Tantalum Strengthened Alloy for Flying Gasturbines, in Materials for Transportation Technology, Volume 1 (ed P. J. Winkler), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527606025.ch35
DaimlerChrysler AG, Forschung und Technologie, Postfach 800 465, 81663 München, Germany; Tel.: 089–607 22393; Fax: 089–607 28627
- Published Online: 23 DEC 2005
- Published Print: 20 APR 2000
Print ISBN: 9783527301249
Online ISBN: 9783527606023
- transportation technology;
- aerospace applications;
- flying gasturbines;
- tantalum strengthened alloy
Nicrotan® 6325 hAlC has been developed for use in the combustors of gas turbines. The improved high-temperature properties of the alloy should allow the metal temperature of the combustion chamber to be increased, which would provide the opportunity of increasing the efficiency, lowering emissions, and decreasing fuel consumption. This alloy is a cobalt, tungsten, and molybdenum-free Ni-base superalloy. It contains as major alloying elements 25 wt.-% chromium, 8 wt.-% tantalum, 3 wt.-% aluminum, 0.3 wt.-% carbon and 0.1 wt.-% yttrium. High-temperature strength is achieved by solid solution strengthening by tantalum, carbide hardening due to the formation of primary precipitated tantalum carbides and γ-precipitation hardening by aluminum and tantalum. In spite of the small grain size creep rupture strength and stress to produce 0.1 % creep is significantly increased in comparison to superalloys being in use today.
GTAW-Welding can easily be accomplished. The matching filler metal is recommended for cast and wrought structures to provide mechanical strength and corrosion resistance similar to the parent metal.
Forming operations can be applied to the solution annealed material but have to consider the actual elongation of the alloy.