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This has been the impetus for extensive research and development work in the area of elevated temperature titanium alloys. Table 1 gives the chemical composition and the maximum service temperature of various grades of titanium alloys mentioned above. Figure 1 shows schematically the relative creep capability of these grades in the form of a Larson Miller plot.

The reader is referred to some excellent reviews on use of titanium alloys in gas turbine engines Bayer, ; Gogia, The technical guide on titanium published by ASM International Donachie, also gives much information on titanium as a gas turbine material. Relative creep capability of titanium alloys used for compressor parts in the form of a Larson Miller plot Schematic. Corrosion of compressor blades can occur due to moisture containing salts and acids collecting on the blading.

To prevent the corrosion, GE has developed patented aluminum slurry coatings for the compressor blades. The coatings are also meant to impart improved erosion resistance to the blades. Without sacrificing stress corrosion resistance, GTD offers increased tensile strength, high cycle fatigue strength and corrosion fatigue strength, compared to type GTD also possesses superior resistance to acidic salt environments to type , due to higher concentration of chromium and presence of molybdenum Schilke, Titanium alloys used for compressor parts in aircraft engines — chemical composition and maximum service temperature Advances in Gas Turbine Technology Table 2 gives the chemical composition of the different steel grades used for compressor blading.

Compressor blade materials for land based gas turbines 4. Combustion hardware for aircraft and industrial gas turbines IGTs Driven by the increased firing temperatures of the gas turbines and the need for improved emission control, significant development efforts have been made to advance the combustion hardware, by way of adopting sophisticated materials and processes. Traditionally combustor components have been fabricated out of sheet nickel-base superalloys.

Hastelloy X, a material with higher creep strength was used from s to s. Nimonic was subsequently introduced and has still higher creep strength Schilke, As firing temperatures further increased in the newer gas turbine models, HA, a cobalt base superalloy has been recently adopted for some combustion system components for improved creep rupture strength Schilke, Coutsouradis et al.

Table 3 gives the chemical composition of combustor materials. Table 3. Combustor materials In addition to designing with improved materials, combustion liners and transition pieces of advanced and uprated machines involving higher firing temperatures are given a thermal barrier coating TBC. The coating serves to provide an insulating layer and reduces the underlying base metal temperature. Section 9 deals with the subject of TBC in detail. Turbine disk applications 5.

Superalloy has been used for manufacture of discs in aircraft engines for Materials for Gas Turbines — An Overview more than 25 years Schilke, Both these alloys have been produced through the conventional ingot metallurgy route. Powered by OJS. User Username Password Remember me. Notifications View Subscribe. Journal Help. Visitor Statistics View My Stats. Article Tools Print this article. Indexing metadata. How to cite item. Finding References. Review policy. Email this article Login required.

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