2.4668 chemical element composition content (%)
With the process of industrialization, nickel-based alloys, as representatives of superalloy materials, are more and more widely used. 2.4668 is a common nickel-based alloy with excellent corrosion resistance, high temperature strength and oxidation resistance, and is widely used in aviation, aerospace, petrochemical, chemical engineering, electric power and other fields.
First, the structure of the material
2.4668 is an ordered solid solution alloy composed of elements such as nickel, chromium, molybdenum, iron, etc. At high temperature, its structure will undergo phase transformation, forming a variety of microstructures such as molybdenum-rich L**es phase, chromium-rich phase and tungsten-rich M6C phase.
2. Metallographic organization
2.The metallographic structure of 4668 is mainly composed of phase sum'phase composition. The phase is a solid solution, which has excellent plasticity and deformation ability at high temperature; γ'The phase is a diffuse intermetallic compound with high temperature strength and oxidation resistance. At high temperatures,'The volume fraction of the phase increases over time, improving the high-temperature strength and oxidation resistance of the alloy.
3. Mechanical properties
2.4668 has excellent high-temperature strength and oxidation resistance, and its tensile strength can reach more than 1000MPa. At high temperatures, the plasticity and deformation ability of the alloy are good, and forging, hot rolling, hot extrusion and other processing technologies can be carried out. The alloy has good thermal stability and is not easy to loosen and deform at high temperatures.
Fourth, processing technology
4.1 plate
2.Plates of 4668 are generally produced using a hot rolling process and can be made into plates of different sizes. In the process of machining, it is necessary to pay attention to the thermal stability of the alloy to avoid loosening and deformation of the alloy at high temperatures.
4.2 round bars
2.The round bars of 4668 can be processed by hot rolling, hot extrusion and other processes. In the processing process, it is necessary to pay attention to the high-temperature strength and oxidation resistance of the alloy to avoid alloy fracture and oxidation.
4.3 Forgings
2.The forgings of 4668 are generally processed by hot forging process, which can be made into forgings of different sizes. In the processing process, it is necessary to pay attention to the high-temperature strength and plasticity of the alloy to avoid alloy fracture and deformation.
4.4 Seamless tubes
2.The seamless pipe of 4668 can be processed by hot rolling, hot extrusion and other processes. In the processing process, it is necessary to pay attention to the high-temperature strength and oxidation resistance of the alloy to avoid alloy fracture and oxidation.
4.5 Forging rings
2.The forging rings of 4668 are generally processed by hot forging process, which can be made into forging rings of different sizes. In the processing process, it is necessary to pay attention to the high-temperature strength and plasticity of the alloy to avoid alloy fracture and deformation.
5. Experimental methods and conclusions
2.The experimental methods of 4668 mainly include tensile test, impact test, hardness test, etc. Experiments can be concluded with 2The data of 4668 in terms of mechanical properties, high-temperature strength and oxidation resistance provide a reference for the application of the alloy.
6. The difference between casting and forging
Casting and forging is 2There are two main methods of 4668 machining. Casting is the pouring of molten alloy into a mold and the solidification of it by cooling; Forging is the process of putting the heated alloy into a mold for processing. Casting is suitable for the production of large, complex parts, while forging is suitable for the production of high-precision, high-quality parts.
7. Smelting process
2.The smelting process of 4668 mainly includes vacuum induction smelting, vacuum arc smelting, etc. In the smelting process, attention needs to be paid to controlling the composition and impurity content of the alloy to improve the quality and performance of the alloy.
8. Cold rolling, hot rolling and cold drawing
In 2In the processing process of 4668, cold rolling, hot rolling and cold drawing are commonly used processing methods. Cold rolling is suitable for the production of thin plates; Hot rolling is suitable for the production of thick plates, round bars, etc.; Cold drawing is suitable for the production of high-precision, high-quality seamless tubes.
9. Electroslag and electric furnace
2.In the preparation of 4668, electroslag and electric furnace are commonly used melting methods. Electroslag melting is suitable for the production of small batches of high-quality alloys; Electric furnace melting is suitable for the production of high-volume, low-cost alloys.
Conclusion:
In summary, 24668 is an alloy material with excellent performance and wide application value. During preparation and processing, attention needs to be paid to controlling the composition and impurity content of the alloy to improve the quality and performance of the alloy. During the processing process, it is necessary to pay attention to the high-temperature strength and oxidation resistance of the alloy, and select the appropriate processing technology to avoid alloy fracture and deformation. Experiments can be concluded with 2The data of 4668 in terms of mechanical properties, high-temperature strength and oxidation resistance provide a reference for the application of the alloy.