High temperature creep of tungsten free cobalt based Superalloys
July 17-21, 2016
The current study reports the high temperature creep behaviour of the recently discovered1,2,3 Co-Al-Mo-Nb/Ta superalloys with additions of Ni, Cr and Ti. These alloys have a classical microstructure, where the L12 ordered is present uniformly throughout the matrix of cobalt in the form of coherent precipitates. The in these alloys, has been stabilized without the addition of tungsten. This results in lower density as well as easier homogenization treatment, since slowly diffusing tungsten is absent. The solvus of these alloys is beyond 1000o C. The alloys exhibit excellent mechanical properties at higher temperatures, with specific strengths that are attractive compared to commercially available current cast polycrystalline cobalt based superalloys.
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Abhishek Sharma, Priyanka Agrawal, Prafull Pandey, Surendra Kumar Makineni, Dipankar Banerjee, and Kamanio Chattopadhyay, "High temperature creep of tungsten free cobalt based Superalloys" 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/44