A Carbide Reinforced Low Expansion Alloy

Abstract

The invention belongs to the technical field of carbide enhanced low-expansion materials, and particularly relates to carbide enhanced low-expansion alloy. The carbide enhanced low-expansion alloy includes Fe-Ni system low-expansion alloy and carbide forming elements including C, V, Ti and Nb, and specifically, the carbide enhanced low-expansion alloy comprises, by mass, 30.0-38.0% of Ni, 0.4-1.5%of V, 0-1.0% of Nb, 0-1.0% of Ti, 0.4-0.9% of C, 0.30-0.60% of Si, 0.2-0.5% of Mn, 0-0.01% of P, 0-0.01% of S, and the balance Fe. According to the carbide enhanced low-expansion alloy, based on thecomponents of the Fe-Ni alloy, by adding the appropriate amount of C, V, Nb and Ti, the carbide enhanced low-expansion alloy easy to machine is obtained within the temperature range of 20-100 DEG C, the indoor temperature strength is higher than 1000MPa, and the expansion coefficient alpha is smaller than 2.0*10<-6> / DEG C.

Description

technical field [0001] The invention belongs to the technical field of carbide-reinforced low-expansion materials, in particular to a carbide-reinforced low-expansion alloy. Background technique [0002] Iron-nickel low-expansion alloys have a low expansion coefficient α at room temperature to 100°C, usually α 20～100℃ ≤1.5×10 -6 / °C, but its tensile strength Rm is generally less than 500MPa, yield strength Rp0.2 is less than 250MPa, and elastic modulus E is less than 140GPa. It is variable when used as a structural support component and cannot be applied to high-precision instruments and equipment. With the rapid development of science and technology, aerospace remote sensors, precision lasers, optical measurement systems and other fields have put forward higher requirements for low-expansion alloys, not only low expansion coefficient, but also high strength. Foreign low-expansion alloys are concentrated in western countries, such as Hitachi, Mitsubishi and other companies...

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Problems solved by technology

The applicant of the present application applied for the Chinese patent application No.02131205.2 on September 13, 2002 for the invention patent application 'high-carbon carbide reinforced low-expansion alloy structural steel', but the expansion coefficient is relatively high (α 20～100 ≥5.5×10 -6 / °C), at the same time, due to the high carbon content of the alloy, it is easy to form coarse primary carbides during the solidification process, and the plasticity of the alloy is poor.

GH907, GH909 and other high-temperature low-expansion alloys, in order to increase the service temperature, more Co is added to the alloy, which has high strength, but the expansion coefficient is also relatively high. 室温～400℃ ≤8.2×10 -6 / °C

[0004] At present, the expansion coefficient of FeNi alloy is α 20～100℃ Can be less than 1.5×10 -6 / °C, but its low strength is usually less than 500MPa

In the prior art, high-strength low-expansion alloys without adding Co and without cold deformation have not been reported so far.

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