All knowledge points about superalloys

Superalloys are a special class of metal materials, which are mainly based on iron, nickel and cobalt, and can work stably under certain stresses at temperatures as high as 600 degrees Celsius or even higher. This material not only has excellent high-temperature strength, but also has excellent oxidation and corrosion resistance. In addition, superalloys also have good fatigue properties and fracture toughness, and these combined properties make them particularly important in industrial applications.

Superalloys usually have a single austenitic structure, which allows them to maintain organizational stability and reliability in different temperature environments. Because superalloys are highly alloyed, they are sometimes referred to as "superalloys". This material is widely used in the fields of aviation, aerospace, petroleum, chemical industry and shipbuilding, and is an important high-tech material.

According to the different matrix elements, superalloys are mainly divided into iron base, nickel base and cobalt base three categories. From the perspective of preparation process, superalloys can be divided into deformation superalloys, casting superalloys and powder metallurgy superalloys. According to the different strengthening methods, superalloys can be divided into solid solution strengthening type, precipitation strengthening type, oxide dispersion strengthening type and fiber strengthening type.

Definition of superalloy:

Superalloy is a kind of metal material based on iron, nickel and cobalt, which can work stably for a long time under certain stress in a high temperature environment above 600℃.

Superalloy naming method:

The names of deformed superalloys usually begin with "GH" followed by four Arabic numerals. The first and second digits after the prefix represent the classification number, 1 and 2 represent iron or iron-nickel bases, 3 and 4 represent nickel bases, and 5 and 6 represent cobalt bases. While 1, 3 and 5 represent solid solution strengthened alloys, 2, 4 and 6 represent aging precipitation alloys. The second, third and fourth digits after the prefix indicate the number of the alloy.

The names of cast superalloys begin with "K" followed by three Arabic numerals. The first digit after the prefix indicates the classification number, which has the same meaning as the deformed alloy, while the second and third digits indicate the number of the alloy.

The names of powder superalloys begin with "FGH" followed by Arabic numerals to indicate the different alloy types.

Through such naming rules, we can clearly identify and distinguish different types of superalloys in order to choose the right material in practical applications.