Aero-engine is one of the most core components of aircraft. This is because it has relatively high technical requirements and is difficult to manufacture. As an important power device in the flight process of aircraft, it has very high requirements for processing materials. It has the properties of light weight, high toughness, temperature resistance, oxidation resistance and corrosion resistance, and the high-quality properties of superalloy make it meet the requirements of aero-engine materials.
Superalloy materials can maintain good performance at temperatures above 600°C and under certain stress conditions. The emergence of superalloy materials is to meet the demanding requirements of modern aerospace equipment. After years of material evolution, superalloys have become important materials for aerospace equipment manufacturing hot-end components. According to related reports, in aero-engines, Its usage accounts for more than half of the entire engine material.
In modern aero-engines, the use of superalloy materials is relatively large, and many engine components are produced with superalloys, such as combustion chambers, guide vanes, turbine blades, and turbine disk casings, rings, and afterburners. Components such as combustion chambers and tail nozzles are produced using superalloy materials.
Application of superalloy in aeroengine
With the continuous evolution of technology and the continuous deepening of the field of exploration, the research on new rhenium-containing single crystal blades and new superalloys will continue to be explored. New materials will add new strength to the field of aerospace equipment manufacturing in the future.
1. Research on single crystal blades containing rhenium
Some studies have shown that when processing materials with single crystal composition, both alloy properties and process properties need to be taken into account, because single crystals need to be used in relatively harsh environments, so some alloying elements with special effects are often added to the materials to improve. single crystal properties. With the development of single crystal alloys, the chemical composition of the alloy has changed. In the material, if the platinum group elements (such as Re, Ru, Ir elements) are added, the content of refractory elements W, Mo, Re, and Ta can be increased. Increase the total amount of elements that are more difficult to dissolve, so that elements such as C, B, Hf can be changed from the "removed" state to the "used" state; reduce the content of Cr. At the same time, adding more other alloying elements can make the material maintain the set stability in different material performance requirements.
The use of rhenium-containing single crystal blades can greatly improve its temperature resistance and enhance the creep strength. Adding 3% rhenium to the single crystal alloy and appropriately increasing the content of cobalt and molybdenum elements can increase the temperature resistance by 30 °C, and the durable strength and oxidation corrosion resistance can also be in a good balance. state, which will be beneficial to the large-scale application of rhenium-containing single crystal blades in the aerospace field. The use of rhenium-containing single crystal materials for aero-engine turbine blades is a trend in the future. Single crystal blades have obvious advantages in terms of temperature resistance, thermal fatigue strength, oxidation resistance and corrosion resistance.
2. Research on new superalloys
There are many types of new superalloy materials, the more common ones are powder superalloy, ODS alloy, intermetallic compound and high temperature metal self-lubricating material.
Powder superalloy material:
It has the advantages of uniform structure, high yield and good fatigue performance.
Intermetallic compounds:
It can reduce the weight of components and improve performance, which is very suitable for making power propulsion systems.
ODS alloys have:
Excellent high temperature creep performance, high temperature oxidation resistance
High-temperature metal-based self-lubricating materials:
It is mainly used to produce high-temperature self-lubricating bearings, which increases the strength of the bearing and enhances the bearing capacity.
With the increasing application of superalloy hard tubes in aero-engines, the demand for them will continue to increase in the future aerospace field.
Post time: Mar-02-2023