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High strength cast Ni3Al based high-temperature alloy containing W and its preparation method
technical field
The field of high-temperature alloy technology particularly involves a high-strength cast Ni3Al based high-temperature alloy containing W and its preparation method.
Background technology
Currently, structural materials widely used in coal, natural gas, and oil conversion and utilization systems, as well as advanced thermal engines, such as austenitic stainless steel and high-temperature alloys, often cannot simultaneously meet the strength, toughness, and corrosion resistance required for service conditions.
Although coating materials such as FeCrAl have excellent corrosion resistance, their high-temperature strength is poor. Therefore, there is an urgent need to develop new alloys to meet the harsh service conditions of high-temperature structural components, namely alloys with good high-temperature mechanical properties and excellent corrosion resistance, and Ni3Al based alloys precisely meet the above requirements.
The intermetallic compound Ni3Al has unique high-temperature properties and is highly suitable for application in high-temperature fields:
Firstly, the hardness of Ni3Al increases with temperature, and the fatigue performance of Ni3Al alloy is much better than that of nickel based high-temperature alloy, and its creep performance is equivalent to or higher than that of the latter.
Secondly, Ni3Al is prone to form dense alumina at high temperatures, which has excellent corrosion resistance. Especially after pre oxidation treatment, it has good chemical compatibility with many media.
In addition, Ni3Al alloy has excellent resistance to carburization.
More importantly, the long-range ordered Ni3Al structure of L12 can increase the high-temperature diffusion energy barrier of atoms, reduce their migration ability, and give them good structural stability and high-temperature deformation resistance controlled by diffusion processes.
In summary, the high-temperature characteristics of Ni3Al based alloys have significant advantages, similar to high-temperature ceramic materials, such as excellent high-temperature strength, oxidation resistance, carburization resistance, and good fatigue performance. Due to the direct use of cast Ni3Al based alloys in the as cast state, their microstructure does not need to be changed through heat treatment, and can only be controlled by controlling the solidification process. Therefore, the selection of composition for casting Ni3Al based alloys is particularly important.