Application of high temperature alloys

High-temperature alloys are iron, nickel and cobalt-based metal materials that can work for a long time at temperatures above 600°C and under certain stresses, with excellent high-temperature strength, good resistance to oxidation and thermal corrosion, good fatigue properties, fracture toughness and other comprehensive properties, also known as "super alloys," mainly used in Aerospace field and energy field.

1、Aerospace field

China's development of independent aerospace industry to develop advanced engines, will bring the market demand for high-end and new high-temperature alloys increased.

The aero-engine is called the "flower of industry", is the highest technical content in the aviation industry, one of the most difficult components. As the aircraft power plant of the aircraft engine, it is particularly important that the metal structure material should have the performance of light weight, high strength, high toughness, high temperature resistance, oxidation resistance, corrosion resistance, etc. This is almost the highest performance requirements of the structural materials.

High-temperature alloys are metal materials that can work for a long time at more than 600°C and under certain stress conditions. High-temperature alloys are developed to meet the demanding material requirements of modern aero engines, and have become an irreplaceable class of key materials for aero engine hot-end components. In advanced aircraft engines, the proportion of high-temperature alloys has been as high as 50% or more.

In modern advanced aircraft engines, the amount of high-temperature alloy materials account for 40% to 60% of the total engine. In the aero-engine, high-temperature alloy is mainly used in the combustion chamber, guide vanes, turbine blades and turbine disc four hot section parts; in addition, it is also used in the magazine, ring parts, the accelerator combustion chamber and tail nozzle and other components.

2、Energy field

High temperature alloys have a wide range of applications in the energy field. In coal power boilers with high parameters of ultra-supercritical power generation, superheater and re-superheater must use good creep resistance, antioxidant properties on the steam side and excellent corrosion resistance on the flue gas side of the high-temperature alloy tubes; in gas turbines for gas power, turbine blades and guide blades need to use excellent resistance to high-temperature corrosion and long-term organizational stability of anti-hot corrosion high-temperature alloy; in the field of nuclear power, steam generator heat transfer tube In the field of nuclear power, high-temperature alloys with good solution corrosion resistance must be used; in the field of coal gasification and energy saving, high-temperature alloys with excellent resistance to high-temperature thermal corrosion and high-temperature abrasion are widely used; in oil and gas extraction, especially in deep well extraction, the drilling tools are in an acidic environment of 4-150 ℃, coupled with the presence of CO2, H2S and sediment, etc., corrosion-resistant and wear-resistant high-temperature alloys must be used [5].

China's large power generation equipment manufacturing groups such as Shanghai Electric, Dongfang Electric, and Harbin Turbine Plant have improved their production scale and production technology in recent years, driving the demand for turbine discs for power generation equipment. The new generation of power generation equipment being developed domestically - large ground combustion engines (also available for naval power) has made significant progress and will drive the demand for high-temperature alloys after mass production is achieved. At the same time, the localization of nuclear power equipment will also drive the demand for domestic high-temperature alloys.