At 600-1200 ℃ high temperature alloys can withstand high temperature stress and some have antioxidant or anti-corrosion alloy. 
 By the matrix elements can be divided into iron-based superalloys, nickel-based superalloy and cobalt base superalloy. Preparation process can be divided into deformed by high temperature superalloys 
 Alloys, high temperature alloys and powder metallurgy high-temperature casting alloys. There are ways to strengthen the solid solution strengthening by type, precipitation strengthening type, oxide dispersion strengthened-and fiber-reinforced type. High-temperature alloys are mainly used in the manufacture aviation, ships and industrial gas turbines the turbine blades, vanes, turbine disks, high-pressure compressor disk and high-temperature combustion chamber and other components, but also for the manufacture of spacecraft, rocket engines, nuclear reactors, petrochemical equipment and the conversion of coal and other energy conversion devices. 
 Edit this paragraph development 
 Development from the late 1930s, Britain, Germany and the United States began to study high-temperature alloys. During World War II, in order to meet the needs of the new aero-engine, high-temperature alloys and used to enter a boom period. The early 1940s, the British first 80Ni-20Cr alloy by adding a small amount of aluminum and titanium, the formation of γ phase for strengthening, the development of the first high-temperature strength of nickel-based alloys. During the same period, the United States in order to meet aviation piston engine with turbocharger development, beginning with the cobalt-based alloy made Vitallium blade. In addition, the United States developed Inconel nickel-based alloys for the production of jet engine combustion chamber. After the metallurgist to further improve the alloy's high temperature strength, nickel-based alloys by adding tungsten, molybdenum, cobalt and other elements to increase the aluminum, titanium content, developed a series of grades of alloys, such as the UK's "Nimonic", United States "Mar-M" and "IN", etc.; in the cobalt-based alloys by adding nickel, tungsten and other high-temperature alloys 
 Elements, the development of a variety of high-temperature alloys, such as X-45, HA-188, FSX-414 and so on. As the lack of resources of cobalt, cobalt-base superalloy development is restricted. 40 years, iron-based superalloys has been developed, the 50's there A-286 and Incoloy901 other brands, but the high temperature stability is poor, slow development since the 1960s. After the Soviet Union in 1950 began producing "ЭИ" grade nickel-based superalloy, and later produced "ЭП" series wrought superalloy and ЖС series cast superalloy. China began trial production in 1956 high-temperature alloy, and gradually form a "GH" series of wrought superalloy and "K" series of casting high temperature alloys. 1970 United States also adopt a new manufacturing process of directional solidification and powder metallurgy turbine disk blade, developed a single crystal superalloy blades and other components to meet the aero-engine turbine inlet temperature rising needs. Beijing Science and Technology Co., Ltd. offers financial products high temperature alloy forgings 
 Edit this paragraph to improve strength 
 Solid solution strengthening 
 Joined with the base metal atoms of different sizes of elements (chromium, tungsten, molybdenum, etc.) caused by lattice distortion of the base metal superalloy 
 Adding alloy matrix can reduce the stacking fault energy elements (such as cobalt) and adding the matrix elements can slow the rate of diffusion of elements (tungsten, molybdenum, etc.) to strengthen the matrix. 
 Precipitation strengthening 
 Through aging, from the supersaturated solid solution in the second phase precipitates (γ, γ ", carbide, etc.) to strengthen the alloy. Γ phase and the same substrate, are face-centered cubic structure, lattice constant and the substrate are similar, with crystal coherent, so γ phase in the matrix can was fine granular homogeneous precipitation, impede dislocation movement, and a significant strengthening effect. γ phase is the A3B-type intermetallic compounds, A represents nickel, cobalt, B stands for aluminum, titanium , niobium, tantalum, vanadium, tungsten, and chromium, molybdenum, iron can be of either the A B. nickel-based alloys is typical of the γ phase Ni3 (Al, Ti). γ phase strengthening effect can be obtained through the following channels strengthen: ① increase the number of γ phase; ② the γ phase and the matrix have the appropriate degree of mismatch, for a total distortion of the grid strengthening effect; ③ adding niobium, tantalum and other elements increase the γ-phase antiphase boundary energy to improve their resistance to dislocation cutting to high-temperature alloys 
 Force; ④ adding cobalt, tungsten, molybdenum and other elements to improve the strength of the γ phase. γ "phase is body-centered tetragonal structure, the composition of Ni3Nb. because of γ" phase and the matrix of the greater degree of mismatch can lead to a greater degree of coherent distortion of the alloy to obtain a high yield strength. But more than 700 ℃, hardening effect will be significantly reduced. Cobalt-based superalloys generally does not contain the γ phase, but with carbide strengthening. 
 Grain boundary strengthening 
 At high temperatures, the alloy grain boundaries are weak links, adding small amounts of boron, zirconium and rare earth elements can improve grain boundary strength. This is because the rare earth elements to purify the grain boundaries, boron, zirconium grain boundary atomic fill vacancies, lower than Cheng Zhongjing boundary diffusion creep rate, inhibition of the accumulation of grain boundary carbides and grain boundaries to promote the second phase ball. In addition, adding the right amount of cast alloy of hafnium, can also improve the grain boundary strength and ductility. Grain boundaries can also be formed by heat treatment in the distribution chain or cause bending grain boundary carbides to improve plasticity and strength. 
 Oxide dispersion strengthened 
 By powder metallurgy method, high temperature alloys by adding small oxide remains stable, high-temperature alloy was dispersed state 
 State, resulting in a significant strengthening effect. Oxides are often added such as ThO2 and Y2O3. These oxides by blocking dislocation motion and dislocation stability and other factors makes alloy sub-structure has been enhanced. 
 Edit this paragraph manufacturing process 
 Non-or less aluminum, titanium, high temperature alloys, generally use the electric arc furnace or a vacuum induction furnace smelting. Aluminum, titanium alloys such as high temperature melting in the atmosphere, the element is not easy to control burning, gas, and inclusion into the more it should be vacuum smelting. To further reduce the inclusion of content, improve the distribution of inclusions and the crystal structure ingot, secondary smelting and remelting can be a combination of double process. The primary means of electric arc furnace smelting, vacuum induction furnace and non-vacuum induction furnace; primary means of remelting furnace and vacuum consumable electroslag furnace.