Do you know what the production process of high temperature alloy is like?

Superalloy materials are widely used in many fields, such as aero-engine, automobile engine, gas turbine, nuclear power, petrochemical and so on, because of their excellent oxidation resistance and hot corrosion resistance.

The so-called high temperature alloy, that is, a kind of alloy that can work for a long time under the action of high temperature above 600 ℃ and certain stress. Compared with traditional metals, high-temperature alloy materials have high temperature and high strength in performance, good oxidation resistance and hot corrosion resistance, good fatigue resistance, fracture toughness and good elastic plasticity.

High temperature alloys are generally divided into three ways: according to the type of matrix elements, according to the type of alloy strengthening and according to the material forming method.

High-temperature alloy products are mainly non-standardized, so the production process is more complex, but basically can be divided into three steps: melting, casting and hot processing, the powder metallurgy industry will replace the casting process for hot pressing.

Superalloys are widely used in aero-engines, automobile engines, gas turbines, nuclear power, petrochemical and other fields due to their excellent oxidation resistance and hot corrosion resistance.

In many applications, aerospace still occupies. An important position, accounting for 55% of the total demand, followed by the power industry, accounting for 20%.

High-temperature alloys have been used in aero-engines since their birth. In modern aero-engines, high-temperature alloy materials are mainly used in four hot-end components: combustion chamber, guide chamber, turbine blade and turbine disk, as well as in casing, ring parts, afterburner and tail nozzle.

The amount of high-temperature alloy materials accounts for 40-60% of the total weight of the engine, and this proportion exceeds 50% or even more in the engine.

On July 11, 2016, Boeing released on the first day of the Van Paul Air Show. The new edition of the Current Market Outlook predicts that 39,620 new aircraft will be needed over the next 20 years, a 4.1 percent increase from last year's forecast.

Due to the different proportion of high-temperature alloys required for different types of engines, according to estimates, the next twenty years. The total demand for high-temperature alloys for all types of new aircraft engines in civil aviation is 427000 tons.

According to the data predicted by the US Department of Defense, it is estimated that in the next 20 years, China will add 1430 fighter jets, 1500 large military aircraft, and 500 trainer aircraft. The total demand for high-temperature alloys will reach 57000 tons.

In addition, the maintenance and repair of existing military aircraft is converted into 2000 engines, and the corresponding high-temperature alloy demand reaches about 10000 tons. Therefore, the demand for high-temperature alloys in the military field will reach 67000 tons.

Gas turbines are another major use of superalloys, and their structure and principles are similar to those of aero engines. Since the temperature of the gas sprayed on the impeller of the gas turbine is as high as 1300°C, the impeller needs to be made of a high-temperature alloy.

The application of gas turbine is divided into the field of gas turbine for power generation and the field of gas turbine for ships and ships, mainly the latter. In the military field, more than 75% of the main naval vessels use gas turbine power.

For the gas turbine superalloy market, according to the forecast of Rolls-Robles in 2013, the market demand for gas turbines as ship power will reach 270 billion US dollars in the next two decades, and the corresponding service demand will reach 125 billion US dollars, with a broad market space.

At present, only about 10 main warships in China use gas engines, and the technical problems of domestic ship-to-ship gas turbines have been solved. China's navy is expected to form a combat system of three major offshore fleets and several formations. It is expected to add about 97 destroyers and frigates, about 200 small and medium-sized ships, and the demand for high-temperature alloys is expected to be about 33000 tons.

Automobile exhaust gas turbocharger turbine is also an important application field of high-temperature alloy materials. At present, the turbine impellers used by my country's turbocharger manufacturers are mostly nickel-based high-temperature alloy turbine impellers, which form a rotor together with the turbine shaft and the compressor impeller.

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