A New Tantalum Strengthened Alloy for Flying Gasturbines

  1. Dr. P. J. Winkler
  1. U. Brill

Published Online: 23 DEC 2005

DOI: 10.1002/3527606025.ch35

Materials for Transportation Technology, Volume 1

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

Editor Information

  1. DaimlerChrysler AG, Forschung und Technologie, Postfach 800 465, 81663 München, Germany; Tel.: 089–607 22393; Fax: 089–607 28627

Author Information

  1. Krupp VDM GmbH, P.O. Box 12 51, 58742 Altena, Germany

Publication History

  1. Published Online: 23 DEC 2005
  2. Published Print: 20 APR 2000

Book Series:

  1. EUROMAT 99

ISBN Information

Print ISBN: 9783527301249

Online ISBN: 9783527606023



  • transportation technology;
  • materials;
  • 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.