High Temperature Alloys for Gas Turbines

1975 ◽  
Vol 47 (1) ◽  
pp. 14-20
Author(s):  
H. Gaytor
Keyword(s):  
High Temperature ◽  
Gas Turbines ◽  
High Temperature Alloys

High Temperature Alloys for Gas Turbines

1948 ◽  
Vol 52 (446) ◽  
pp. 138-139
Author(s):  
F. M. Owner ◽  
William Griffiths
Keyword(s):  
High Temperature ◽  
Gas Turbines ◽  
High Temperature Alloys

Evaluation of High-Temperature Alloys for Helium Gas Turbines

1984 ◽  
Vol 66 (1) ◽  
pp. 195-206 ◽  
Author(s):  
Wolfgang Jakobeit ◽  
Jörn-Peter Pfeifer ◽  
Georg Ullrich
Keyword(s):  
High Temperature ◽  
Gas Turbines ◽  
High Temperature Alloys ◽  
Helium Gas

The Effect of High Temperature on the Degradation of Heat-Resistant and High-Temperature Alloys

2009 ◽  
Vol 147-149 ◽  
pp. 744-751 ◽  
Author(s):  
Józef Błachnio
Keyword(s):  
High Temperature ◽  
Mechanical Strength ◽  
Gas Turbines ◽  
Base Alloy ◽  
Heat Resistant ◽  
High Temperature Materials ◽  
High Temperature Alloys ◽  
Aerospace Technology ◽  
Aero Engines ◽  
Nickel Base

Heat-resistant and high-temperature materials are used to manufacture components, devices, and systems operated at high temperatures, i.e. under severe heat loads. Gas turbines used in the power industry, the traction, marine, and aircraft engines, the aerospace technology, etc. are good examples of such systems. Generally, as the temperature increases, the mechanical strength of materials decreases. While making such materials, there is a tendency to keep possibly low thermal weakening. In the course of operating gas turbines, various kinds of failures/defects/ damages may occur to components thereof, in particular, to blades. Predominating failures/damages are those attributable to the material overheating and thermal fatigue, all of them resulting in the loss of mechanical strength. The paper has been intended to present findings on changes in the microstructure of blades made of nickel-base alloy due to high temperature. The material gets overheated, which results in the deterioration of the microstructure’s condition. The material being in such condition presents low high-temperature creep resistance. Any component, within which such an effect occurs, is exposed to a failure/damage usually resulting in the malfunctioning of the turbine, and sometimes (as with aero-engines) in a fatal accident. Failures/damages of this kind always need major repairs, which are very expensive.

The Residual Oil Ash Corrosion Problem—A Review

CORROSION ◽  
1959 ◽  
Vol 15 (11) ◽  
pp. 61-66 ◽  
Author(s):  
C. J. SLUNDER
Keyword(s):  
High Temperature ◽  
Gas Turbines ◽  
Sulfate Solution ◽  
Combustion Products ◽  
Sodium Content ◽  
Testing Procedures ◽  
Oil Additives ◽  
High Temperature Alloys ◽  
Basic Studies ◽  
Made In

Abstract Progress being made in combatting accelerated high-temperature corrosion caused by combustion products of residual fuel oils is reviewed. Results of laboratory investigations cannot be compared strictly because of wide differences in testing procedures used. No effective and economical method for removing all offending ash components has been found, although lowering «~>f sodium content by washing with magnesium sulfate solution has been applied successfully to gas turbine operation. Available high-temperature alloys do not have adequate resistance to oil-ash attack at temperatures above 1200 F. Improved corrosion resistance has been attained with certain experimental alloys but some of these are difficult to fabricate into the required form and have inferior mechanical properties. Surface treatments such as aluminizing, chromizing and sili­conizing appear to have some inherent protective value, but further development of procedures for applying impervious and adherent coatings is needed. Investigation of oil additives has received the most attention in recent years. A great many inorganic, or metal-organic compounds are effective oil-ash corrosion inhibitors but only a few have been found to be economically feasible. Additives raise melting point of ash components so they will be solid at operating temperatures in boilers and gas turbines. Under certain conditions some additives reduce corrosion but increase deposit formation. Progress is being made in basic studies to identify reactions taking place during combustion of oil and in appplication of this knowledge to establish mechanism of the corrosion reaction. 4.3.3

The Problem of High Temperature Alloys for Gas Turbines

1948 ◽  
Vol 52 (445) ◽  
pp. 1-26
Author(s):  
William T. Griffiths
Keyword(s):  
High Temperature ◽  
Gas Turbine ◽  
High Temperatures ◽  
Gas Turbines ◽  
High Speed ◽  
Mechanical Equipment ◽  
Aircraft Engines ◽  
Efficient Operation ◽  
High Temperature Alloys

It is now a matter of history that the development of an efficient gas turbine for use in aircraft engines had to await the availability of materials with the properties which would give an adequate life under the conditions which have to be imposed for efficient and economic service. These conditions are, of their type, more severe than any so far imposed on materials in other mechanical equipment. For efficient operation the gases employed in the turbine must be at a high temperature and the flow of gas passing through must be large. In aircraft engines also, the turbine must operate at high speed, with the resulting accompaniment of high stresses. It was to the metallurgist that the engineer naturally turned first for materials to meet these conditions of high temperatures and high stresses and, although some attention has been given to non-metallic substances, the problem still remains essentially a metallurgical one.

JESSOP SAVILLE H.40

Alloy Digest ◽  
1963 ◽  
Vol 12 (1) ◽  
Keyword(s):  
Fracture Toughness ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Alloy Steel ◽  
Gas Turbines ◽  
Heat Treating ◽  
Temperature Performance

Abstract Jessop-Saville H.40 is an alloy steel recommended for high-temperature stressed components of gas turbines. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness, creep, and fatigue. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: SA-140. Producer or source: Jessop-Saville Ltd, Brightside Works.

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