Nickel-based alloys refer to a class of alloys with com […]
Nickel-based alloys refer to a class of alloys with comprehensive properties such as high strength and certain oxidation and corrosion resistance at a high temperature of 650-1000°C.
According to the main performance, it is subdivided into nickel-based heat-resistant alloys, nickel-based corrosion-resistant alloys, nickel-based wear-resistant alloys, nickel-based precision alloys and nickel-based shape memory alloys. Superalloys are divided into iron-based superalloys, nickel-based superalloys and cobalt-based superalloys according to the different substrates.
It has high strength and certain oxidation and corrosion resistance under a high temperature of 650-1000℃. Due to its high enough temperature strength and oxidation and corrosion resistance, it is often used in the manufacture of high-temperature components for aero-engine blades and rocket engines, nuclear reactors and energy conversion equipment.
Nickel-based alloys are the most widely used. The main reason is that nickel-based alloys can dissolve more alloying elements and maintain better structural stability.
Secondly, a coherent and ordered A3B-type intermetallic compound γ[Ni3(Al, Ti)] phase can be formed as a strengthening phase, so that the alloy can be effectively strengthened, and a higher temperature than iron-based superalloys and cobalt-based superalloys can be obtained. strength.
The third is that chromium-containing nickel-based alloys have better oxidation resistance and gas corrosion resistance than iron-based superalloys. Nickel-based alloys contain more than ten elements, of which Cr mainly plays an anti-oxidation and anti-corrosion role, and other elements mainly play a strengthening role.
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