A kind of high-strength, high-toughness, oxidation-resistant iron-nickel-based superalloy and preparation method thereof

Abstract

The invention discloses a high-strength, high-toughness anti-oxidation iron-nickel-based superalloy and a preparation method thereof, wherein the composition of the iron-nickel-based superalloy includes, by weight percentage, Fe 35-45%, Cr 15-21%, Mo 0.5‑1.4%, W 0.1‑0.8%, Ti 1.8‑2.5%, Al 0.8‑2.5%, Mn≤1.0%, Nb≤0.1%, Co≤2%, Si≤0.05%, C 0.03‑0.10%, B 0.001‑0.005%, P≤0.01%, the balance is Ni. The weight percentage of Cr+Ni is greater than 50%, and the weight percentage of W+Mo is 0.6-1.5%. The iron-nickel-based superalloy of the present invention has high durable strength, high impact toughness and good steam oxidation resistance; γ' phase and M 23 C 6 It is the main strengthening phase; compared with the existing technology, its processing performance is equivalent and the material cost is low, but it has better structural stability, high temperature strength and impact toughness, and can be used to manufacture ultra-supercritical thermal power units at 650 °C and above High-temperature components such as main steam pipes, headers and high-temperature section rotors.

Description

technical field [0001] The invention relates to the technical field of high-temperature metal structural materials, in particular to a high-strength, high-toughness, oxidation-resistant iron-nickel-based superalloy and a preparation method thereof. Background technique [0002] Coal-fired thermal power units provide more than 70% of domestic electricity, but domestic thermal power units have low average power generation efficiency and high energy consumption, and are the main emission sources of sulfur dioxide, nitride NOx, carbon dioxide and mercury. With the improvement of environmental protection requirements, it is necessary to significantly reduce and reduce the carbon dioxide emissions per unit of GDP. In the field of coal power, adopting high-parameter and large-capacity thermal power units is one of the most direct, economical and effective measures to realize the clean and efficient utilization of coal. At present, all developed countries in the world, China and In...

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Problems solved by technology

[0005] The new iron-nickel-based superalloy has a higher temperature bearing capacity than austenitic heat-resistant steel, and has good high-temperature performance, and the material cost is limited compared with high-grade austenitic heat-resistant steel (such as HR3C). The overall cost performance is high, and it is expected Applied to the key high-temperature components of 650°C ultra-supercritical units, but there is no mature iron-nickel-based superalloy system in the existing technology that can meet the requirements of 650°C units

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