Nimonic 80 or Nimonic 80a is a nickel-chromium alloy similar to Nimonic Alloy 75 but made precipitation hardenable by the addition of aluminum and titanium.
Nimonic 80 has good corrosion and oxidation resistance and high tensile and creep rupture properties at temperatures up to 1500°F (815°C).
Nimonic 80 is used in gas turbine components (blades, rings and discs), bolts, tube supports in nuclear steam generators, die-cast inserts and cores, and exhaust valves in internal combustion engines.
Nimonic 80A Definition
Nimonic 80A is a nickel-based superalloy composed of Ni-Cr. It has good strength and very good corrosion resistance and oxidation resistance at high temperature. These advantages make Nimonic 80A widely used in high temperature hot forging components such as aviation, aerospace, power station and transportation.
Nimonic 80A alloy composition
The composition of Nimonic 80A nickel-based alloy is: C≤0.10 wt. %; Cr: 18.0~21.0 wt. %; Si≤1.0 wt. %; Co≤0.20 wt. %; Ti: 1.8~2.7 wt. %; Al: 1.0~1.8 wt. %; B≤0.0080 wt. %; S≤0.015 wt. %; Ni: balance.
Concept Nickel-based superalloy composed of Ni-Cr
Density 8.19g/cm3
Melting point 1320-1365ºC
Nimonic 80A Physical Properties
Mass susceptibility: 5.85×10-6 at 1000 gauss
Volume susceptibility: 4.78×10-5 at 1000 gauss
Nimonic 80A Development History
In 1929, Merica, Bedford and Pilling of the United Kingdom and the United States added a small amount of Al and Ti to the 80Ni-20Cr electrothermal alloy, which can significantly improve the high temperature creep strength. In 1939, the United Kingdom developed the Whittle turbojet engine, in which the turbine blades have high requirements for the high temperature resistance and stress tolerance of the material. In the same year, the British Mond Nickel Company first developed Nimonic 75, a low-C, Ti-containing nickel-based alloy, which was used in the turbine blades of the Whittle engine.
With the addition of Al, Nimonic 80 alloy was later developed, which contains both Al and Ti, which makes the creep properties of the alloy at least tens of degrees higher than that of Nimonic 75. Therefore, this alloy has also become the earliest turbine blade material strengthened by Ni3 (Al, Ti).
Since then, Mond has added B, Zr, Co, Mo and other alloying elements to the alloy, and successively developed Nimonic 80A, Nimonic 90, etc., forming the Nimonc series.
The engines produced in the early days of Rolls-Royce, the largest aero-engine company in the UK, almost all used Nimonic deformed superalloys for its high-temperature blades. With the introduction of advanced production lines from abroad, China's domestic blade materials also use British superalloys, such as GH4080A. On this basis, domestic researchers have also improved the properties and composition of this superalloy, and developed superalloys with independent property rights, which have made great contributions to important scientific research fields such as domestic aerospace.
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