K4648 superalloy is a high-temperature resistant material widely used in the aerospace field. At high temperatures, it has the advantages of excellent oxidation resistance, corrosion resistance, high strength and high plasticity.
1. The material structure of K4648 superalloy
K4648 superalloy is a nickel-based alloy, and its material structure is mainly composed of nickel, chromium, tungsten, molybdenum, iron, copper and other elements. Among them, nickel is the main component of the alloy, accounting for more than 50%. The addition of elements such as chromium, tungsten and molybdenum can improve the corrosion and heat resistance of the alloy, while iron and copper can improve the strength and plasticity of the alloy.
The material structure of K4648 superalloy is also affected by the smelting process. Generally speaking, the smelting process of alloys needs to go through multiple processes such as electric arc furnace or electroslag furnace melting, casting under vacuum or inert gas protection, and heat treatment. These processes can affect aspects such as the chemical composition, crystal structure, and mechanical properties of the alloy.
2. Characteristics of K4648 superalloy
1.Oxidation resistance
K4648 superalloy has excellent oxidation resistance, can work for a long time in high temperature, high pressure and oxidation environment, and is not easy to oxidize corrosion. This characteristic is one of the important reasons why it is widely used in combustion chambers, high-temperature pipes and heat exchangers.
2.Corrosion resistance
K4648 superalloy has excellent corrosion resistance due to the addition of a certain amount of chromium, tungsten and molybdenum elements. In harsh environments such as acidic, alkaline and seawater, the alloy surface is not susceptible to corrosion and wear, and can maintain long-term stable performance.
3.High strength and high plasticity
K4648 superalloy still maintains the characteristics of high strength and high plasticity at high temperatures, and can operate stably in high temperature, high pressure and complex stress environments. This characteristic is one of the important reasons why it is widely used in critical components such as engine wheels, turbine discs, blades and gas turbines.
3. Mechanical properties of K4648 superalloy
The mechanical properties of K4648 superalloy are an important index to evaluate its quality. Here are some mechanical property data of K4648 superalloy:
1.Plates:The tensile strength is 980MPa, the yield strength is 420MPa, and the elongation is 40%.
2.Round bar:Tensile strength 1050MPa, yield strength 550MPa, elongation 25%.
3.Forgings:Tensile strength 1050MPa, yield strength 550MPa, elongation 25%.
4.Seamless Tube:Tensile strength 950MPa, yield strength 450MPa, elongation 35%.
5.Forging rings:Tensile strength 1050MPa, yield strength 550MPa, elongation 25%.
Fourth, the experimental methods and conclusions of K4648 superalloy
The experimental methods and conclusions of K4648 superalloy are also an important way for us to understand its properties. Here are some of the experimental methods and conclusions:
1.Difference Between Casting and Forging
Casting is a manufacturing method in which liquid or semi-solid metal is injected into a mold and then waits for it to cool and solidify. Forging is the process of heating the metal and applying high pressure to make it plastically deform in a solid state.
K4648 superalloy can be machined by casting or forging. Casting can make parts with complex shapes, but they are often less strong and plastic. Forging, you can obtain parts with high strength and high plasticity, but the manufacturing cost is higher.
2.Smelting process
The smelting process of K4648 superalloy also has an important impact on its properties. Some common metallurgical processes include vacuum smelting, melting under the protection of inert gases, and vacuum induction melting.
3.Hot-rolled, cold-rolled and cold-drawn
K4648 superalloy can be processed by hot rolling, cold rolling, and cold drawing. Hot rolling can improve the plasticity and toughness of the material, but it will affect its dimensional accuracy. Cold rolling can improve the hardness and strength of the material, but it can affect its toughness. Cold drawing can improve the surface quality and dimensional accuracy of the material while maintaining high strength and high plasticity.
Through experiments, it can be concluded that K4648 superalloy has excellent oxidation resistance, corrosion resistance, high strength and high plasticity. Its mechanical properties are also excellent, making it suitable for important applications in the aerospace sector. In addition, the properties of the alloy will vary depending on the processing and smelting process. Therefore, when selecting and using K4648 superalloy, it is necessary to comprehensively consider its material structure, characteristics and mechanical properties to ensure its reliability and safety in practical applications.