Your present location:HomeNewsIndustry news > Application of high-temperature alloys and features on various parts of the turbine engine

Application of high-temperature alloys and features on various parts of the turbine engine

Date:2015-09-16 15:15

Since the gas turbine structure is more complex, and the temperature of each part of the forces, etc., vary greatly, so the material requirements and selection will vary.

1, a combustion chamber with a high-temperature alloys
Combustor mechanical stress suffered less, but greater thermal stress, material requirements are: high temperature resistance to oxidation and corrosion gas; enough transient and persistent strength; good thermal fatigue resistance, good plasticity process (lasting, bending performance) and welding properties; alloy at operating temperature long-term organizational stability.

2, guide blades with high-temperature alloys
Guide vanes in the first stage of thermal shock is one of the largest parts of the turbine engine. But because it is static, suffered the mechanical load is not large. Usually due to stress-induced distortion, cracks and burns caused by excessive burning of dramatic changes in temperature caused by the guide vanes often have trouble at work. According to the guide vanes working conditions, require materials with the following properties: sufficient rupture strength and good thermal fatigue properties; have a higher resistance to oxidation and corrosion resistance; such as casting alloy is required to have good casting properties.

3, high-temperature alloy turbine rotor blade
Turbine blades on the turbine engine is one of the most critical components. Although the temperature should be lower than the guide vanes, but the force is large and complex, poor working conditions, the turbine blade material requirements are: high resistance to oxidation and corrosion resistance; high creep capability and lasting fracture; good mechanical fatigue and thermal fatigue properties and good high-temperature and temperature overall performance.

4, with a superalloy turbine disk
Turbine disk at work to uneven plate rim portion withstand higher temperatures than the central portion, resulting in large thermal stresses. Serration parts withstand the maximum centrifugal force, the stress is more complex. To do this requires a turbine disc material: alloy should have a high yield strength and creep strength; good cold and mechanical fatigue properties; linear expansion coefficient is smaller, no notch sensitivity, high low-cycle fatigue properties.

Superalloys trends and new technologies
To meet the needs of a new generation of high-performance gas turbine materials, in addition to the continued development of the directionally solidified and single crystal casting technology casting technology and other areas, superalloy technology and new high-temperature oxidation, anti-gas scour protection coating technology also got wide range of applications. Superalloy technology FGH51 superalloy is the use of phase precipitation hardening nickel-base superalloy powder metallurgy prepared. The alloy γ-phase volume fraction of about 25% -50%, which forms the element atomic fraction of about 50%. Alloy disc member manufacturing process route is to use a vacuum induction melting preparation of master alloy, then the pre-atomized alloy powder preparation, and then made the rough parts. With similar casting, forging high temperature alloys, it has the homogeneous, fine grain, high yield and good fatigue performance, etc., it is one of the highest intensity level superalloy under current working conditions of 650 degrees. This kind of high-temperature gold is mainly used for high-performance engine rotating components such as turbine disks and bearing rings and the like.

TypeInfo: Industry news

Keywords for the information: