29
2022
-
09
This can greatly improve the properties of superalloys
Do you know how to greatly improve the performance of superalloys? Next, let's see how to improve the performance of superalloys!
Superalloys are important materials for manufacturing high-temperature components of gas turbines used in aircraft, ships and industrial transportation. In recent years, they have also been widely used in aerospace, nuclear reactors and chemical industries. How to improve the oxidation resistance and corrosion resistance of superalloys and improve their high temperature strength and service temperature is a very important thing. How to improve the performance of superalloys? Here are some ways to improve the properties of superalloys.
1、 Solution strengthening
The addition of elements (chromium, tungsten, molybdenum, etc.) that are different from the molecular specifications of the base metal materials will cause the matrix distortion of the base metal materials. The addition of elements (such as cobalt) that can reduce the stacking fault energy of alloy base materials and elements (such as tungsten, molybdenum, etc.) that can ease the external diffusion rate of the base material elements will strengthen the base materials.
2、 Precipitation strengthening
Dissolve the second phase from the supersaturated solid solution according to the cold working（ γ’、γ ", cementite, etc.) to strengthen the alloy.
γ‘ All phase substrates are of the same body center structure. The lattice parameters are similar to those of the substrate and are coherent with crystallization γ The phase can be uniformly dissolved as fine particles in the base material, blocking the dislocation fitness exercise, resulting in obvious strengthening effect. γ’ The phase is A3B type chemical substance between metal materials. A means nickel and cobalt, B means aluminum, titanium, niobium, tantalum, vanadium and tungsten, while chromium, molybdenum and iron can be both A and B.
Typical γ‘ The phase is Ni3 (Al, Ti). γ’ The strengthening effect of the phase can be improved in the following ways:
1. Lifting γ‘ Total number of phases;
2. Make γ’ Each phase of the substrate has a suitable degree of imbalance to obtain the reinforcement effect of coherent deformation;
3. Increase by adding niobium, tantalum and other elements γ’ The antiphase domain boundary energy of the phase is used to improve its ability to resist dislocation laser cutting;
4. Add cobalt, tungsten, molybdenum and other elements to improve γ‘ Compressive strength of phase.
γ "The facies is a body centered tetragonal structure, which forms Ni3Nb γ "The imbalance of all phase base materials is very large, which can cause a large level of coherent deformation, making the alloy obtain a high tensile strength. But beyond 700 ℃, the strengthening effect will be significantly reduced. Cobalt based heat resistant alloys generally do not γ Phase, and reinforced with cementite.
Shandong Titanium Nickel Special Steel Co., Ltd
Email:
Address:
Liaocheng Hi tech Zone, Shandong Province, Liaoniu Road and the North of the Road 300 meters east of the New East Ring Road
