Explanation

Generally, at least 25% Ni should be added to stabilize the T-austenite, and 15% Cr should be added to ensure that the alloy has sufficient oxidation resistance and corrosion capacity. Therefore, the iron base high temperature alloy actually uses the FHMi-O ternary system as the matrix. When the nickel content is greater than 40%, it is generally called iron nickel base or nickel iron base high temperature alloy. iron-base superalloy are solution strengthened with Mo or Mo+W as the solution strengthening element, and these alloy are solution strengthened Fe base alloy. In addition, some trace beneficial elements are added to some alloy to strengthen the grain boundary. If the content of alloy elements is low, the profile or part blank can be deformed by hot working, which belongs to iron-base wrought superalloy. Otherwise, it belongs to iron-base cast superalloy. iron-base superalloy is widely used as 650? Components such as turbine discs or flame tubes of different types of aviation engines and gas turbines used below 750 ° C are also widely used in civil industrial sectors.

Classification