A kind of nickel-chromium-iron superalloy with multiphase structure and preparation method thereof

Abstract

The invention relates to a multi-phase microstructure nickel-chromium-iron-series high-temperature alloy and a manufacturing method thereof. The alloy comprises the following components of, by weight,35.0-45.0% of Ni, 30.0-42.0% of Cr, 0-3.00% of W, 0-3.00% of Nb, 0.30-1.10% of C, less than or equal to 2.00% of Si, less than or equal to 2.00% of Mn, less than or equal to 1.00% of Al, less than orequal to 0.02% of B, less than or equal to 1.00% of V, less than or equal to 0.035% of S, less than or equal to 0.035% of P, less than or equal to 0.5% of La and the balance Fe. According to the alloy, the W, the Nb, the C, the Si, the Mn, the Al, the B, the V, the La and the like in the alloy components play the solid solution, grain boundary and two-phase strengthening functions, a high-puritysmelting and electroslag remelting duplex metallurgy process technology is adopted, the microstructure and mechanical property of the alloy is improved through thermal processing and heat treatment, and the obtained alloy has the anti-carburizing performance, the anti-coking performance, the anti-sulfuration performance, the oxidation resistance, the corrosion resistance and the wear resistance.

Description

technical field [0001] The invention relates to a nickel-chromium-iron high-temperature alloy, in particular to a multi-phase structure nickel-chromium-iron high-temperature alloy and a preparation method thereof. Background technique [0002] Under the environmental conditions of carbon plants, coking furnaces, molten silicates, and molten sulfates, alloy materials with high temperature, high strength, excellent oxidation resistance, and good corrosion resistance are required to be made into high-stress, high-temperature corrosion conditions. Parts that work for a long time, such as protection tubes, leaky plates, vent pipes, overheating pipes, overflow ports, nozzles, towers and other device components. [0003] Parts that work under different environmental conditions have different requirements for materials, not only the performance of the material, but also the machinability of the material, and the economical efficiency of the material. [0004] At present, the alloy ...

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Problems solved by technology

[0004] At present, the alloy materials that can be used in carbon plants, coking furnaces, molten silicate, molten sulfate and other environmental conditions include K407, GH5K, GH3007, MGH4755 and other alloy materials. These alloy materials have their limitations. And the economy is not high

For example: K407 casting alloy has low plasticity and is not easy to make complex parts; MGH4755 dispersion-strengthened alloy has poor machinability and is difficult to make large parts; GH3007 has low strength and insufficient high temperature resistance; even GH5k has high strength at high temperature, oxidation resistance, corrosion resistance, etc. The comprehensive characteristics are relatively good, but it is also difficult to meet the processing characteristics of parts and service conditions, which will affect the usability, life and reliability of parts

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