V-Si-B alloys for ultra-high temperature applications
July 17-21, 2016
In this study a contribution on the development of new vanadium-based materials will be presented. Vanadium alloys provide 20% to 30% density reduction compared to nickel-based alloys and steels, while the melting temperature is about ~500°C higher. Silicon-containing vanadium phases enhance the mechanical performance of V alloys while boron additions improve the oxidation resistance of V-Si intermetallic phases. Hence, the most promising alloys must include intermetallic phases to provide the mechanical properties and oxidation resistance at high temperature and a solid solution phase to balance the behavior at ambient temperatures. The desired microstructure can be produced by mechanical alloying and subsequent field assisted sintering of the powders. To understand the effects of mechanical alloying on the resulting microstructures different studies on binary V-Si and ternary V-Si-B are presented.
Resulting from these pretests, a novel three-phase V-Si-B alloy will be presented, which is evaluated in terms of the hardness and the deformation behavior at high temperatures up to 1100°C. Furthermore, the oxidation behavior will be discussed for selected temperatures.
Manja Krüger and Janett Schmelzer, "V-Si-B alloys for ultra-high temperature applications" in "Beyond Nickel-Based Superalloys II", Chair: Dr Howard J. Stone, University of Cambridge, United Kingdom Co-Chairs: Prof Bernard P. Bewlay, General Electric Global Research, USA Prof Lesley A. Cornish, University of the Witwatersrand, South Africa Eds, ECI Symposium Series, (2016). http://dc.engconfintl.org/superalloys_ii/41