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A Carbide Reinforced Low Expansion Alloy
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A low-expansion alloy and carbide technology, applied in the field of carbide-reinforced low-expansion materials, can solve the problems of low strength, high expansion coefficient, and poor alloy plasticity.
Active Publication Date: 2020-04-24
CENT IRON & STEEL RES INST
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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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[0029] The alloy is prepared as follows:
[0030] a. Melting: use vacuum induction furnace to smelt alloy, vacuum degree ≤1×10 -1 Pa, during the smelting process, the burning loss of alloy elements should be strictly controlled, so that the composition of the alloy can be controlled within the design range. Among them, Fe and Ni are directly put into the crucible as a primary feed; V, Ti, Nb, C, Si, and Mn are put into the hopper of a vacuum induction furnace as a secondary feed. The vacuum chamber of the induction furnace casts molten steel into ingots;
[0031] b. Hot forging: After the steel ingot is peeled off, it is lower than 700°C and loaded into a furnace. The heating rate of the alloy ingot is controlled at 100-200°C per hour, and after a proper time of heat preservation at 1150±10°C, the billet is forged to the required specifications;
[0032] c. Heat treatment: hot forging alloy, after solution quenching at 1050±50°C, vacuum aging treatment at 500-600°C for 2-4 ...
Embodiment
[0034] The five-component alloys in Table 1 were smelted using the processing technology of vacuum induction melting→1100°C forging forming→1050°C×30min water quenching→560°C holding for 3h tempering treatment.
[0035] Chemical composition (mass percent %) of table 1 smelting alloy
[0036]
[0037] The physical and mechanical properties of the carbide-strengthened low-expansion alloy prepared by the above process are shown in Table 2.
[0038] The room temperature tensile strength Rm of the carbide-reinforced low-expansion alloy is greater than 1000MPa, the elongation at break Z is greater than 5%, and the expansion coefficient α 20～100℃ -6 / °C.
[0039] Table 2 Physical and mechanical properties of carbide-reinforced low-expansion alloys
[0040]
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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...
Claims
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