Overview. K423 is a nickel-based precipitation-hardening equiaxed crystalline casting superalloy. The alloy contains solution-strengthening elements such as chromium, cobalt and molybdenum, and contains aluminum and titanium'The precipitated strengthening phase forms elements, and boron and hafnium elements are added to purify and strengthen the product boundary. The alloy below 1000 has good oxidation resistance and cold and heat fatigue resistance. Casting process properties of alloys.
Application Overview & Features.
The alloy has been used in the manufacture of aviation turbofan engines and stage guide vanes, and is well produced and used. C1023 alloy, which is similar to this alloy, is used in foreign countries to make RB211, TF41, SPEYMK511 and other engine guide vanes.
Alloys generally do not require surface protection when used. When used above 900, the surface needs to be treated with CRAL co-permeability, which can further improve the corrosion resistance of the alloy. The microstructure stability of the alloy is poor, and a large number of flake phases will be precipitated when used for a long time at 750 900.
Material grade. k423。
Similar grades. C1023 (E).
Ingredient specification (%)
Melting and casting processes.
The master alloy is melted in a vacuum induction furnace, and the parts and test rods are remelted in the vacuum induction furnace. The casting mold adopts investment precision casting shell, and is filled with sand and casting. The refining temperature is 1550 1600, the pouring temperature is 1420 1480, and the shell roasting temperature is 900.
*State. The master alloy and precision castings are in a cast state**.
Physical, elastic and chemical properties.
Melting temperature range.
The point of phase transition. 
In the process of using K423 (K23) alloy, the following points need to be noted:
1.In the process of melting and casting, because the alloy contains more precious elements, it is necessary to strictly control the furnace temperature and pouring temperature to avoid burning loss and oxidation.
2.In the processing process, due to the poor microstructure stability of the alloy, it is necessary to control the processing temperature and cooling rate to avoid cracks and deformation.
3.In the process of use, because the high-temperature oxidation resistance and high-temperature strength of the alloy are closely related to the use temperature, it is necessary to strictly control the working temperature of the engine to avoid overheating.
4.During the maintenance process, the engine needs to be regularly inspected and maintained to ensure the proper operation of critical parts such as guide vanes and recast guides.
As a nickel-based cast superalloy, K423 (K23) alloy has good high-temperature oxidation resistance and high high-temperature strength, so it has been widely used in gas turbine engines and other fields. However, due to the fact that its composition contains more precious elements, it is difficult to smelt and cast, and the microstructure stability is poor, so it is necessary to strictly control the temperature and process parameters during production and use.