In this paper, the basic limitations of superalloys’ in high temperature performances will be explained and then after giving the important properties of MoSi2, some interesting composites of this material will be discussed as a candidate structural material for gas turbine engines.
Innovations on the aerospace and aircraft industry have been throwing light upon building to future’s engineering architecture at the today’s globalization world where technology is the indispensable part of life. On the basis of aviation sector, the improvements of materials used in aircraft gas turbine engines which constitute 50 % of total aircraft weight must protect its actuality continuously. Utilization of super alloys in aerospace and defense industries can not be ignored because of excellent corrosion and oxidation resistance, high strength and long creep life at elevated temperatures. The newly innovated ALLVAC 718 Plus superalloy which is the last version of Inconel 718 has been proceeding in the way to become a material that aerospace and defense industries never replace of any other material with combining its good mechanical properties, easy machinability and low cost. However because it is a newly developed superalloy, in present paper its properties including chemistry, microstructure, strengthening mechanisms, weldability and cost will be discussed and the superiority of the ALLVAC 718 plus will be addressed.
Pest oxidation phenomena is the major drawback of MoSi2 for the applications of this material over gas turbine elements. Therefore, addition of Si3N4 does not only eliminate the structural disintegration behaviour which can only be observed between relatively low temperatures (673-873 K) but also improves the fracture toughness at elevated temperatures. In this study, after giving some significant properties of MoSi2, effect of processing conditions to microstructural morphology and oxidation characteristics at gas turbine operating temperatures will be discussed within a composit approach.
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