Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 3

Low cycle fatigue behavior and microstructure of 3rd generation TiAl-based alloy

nr katalogowy: 52763

Continuous effort over the last decades is emphasized to develop structural materials that could supply appropriate mechanical properties at the highest possible temperatures. The increase of operational temperature is particularly important to achieve higher thermal efficiency, improvement of acceleration, thrust to weight ratio and lower fuel usage of modern jet engines, stationary gas turbines and other high temperature machines[1]. For a gas turbine, increase of 150°C in the turbine entry, could improve its efficiency of about 5% [2]. In power engineering and aeronautics Ti based alloys are used among others for compressor discs and fan blades. Ti fan blades are used in the low-pressure compressor but application of conventional Ti alloys limits temperature in the high pressure compressor up to about 550°C because their insufficient oxidation resistance [3, 4]. There is a need to develop the lightweight alloys which could be used at the temperatures higher than 600°C. Intermetallic bases alloys have a great potential for application as a structural material for HT applications, because of low density, high strength and good oxidation resistance. Their strongly ordered structure and directional bonding is manifested by their high melting point and Young modulus. However, a large number of ordered phases are too brittle for structural applications. Ti-Al intermetallic based alloys, especially third generation with the density of about 4 g/cm3 have very promising mechanical properties. The TiAl alloys may be processed in a similar way like other metals and alloys: with use of conventional manufacturing processes like ingot melting, casting, precision casting, forging, and machining on almost conventional equipment [5]. Third generation of TiAl alloys was developed to be the alternative to nickel-based superalloys in the temperature range up to about 700°C. Due to addition of 5÷10 at. % Nb those alloys have strength and weigh[...]

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