High-strength, high-toughness and corrosion-resistant iron-nickel-based high-temperature alloy and preparation method thereof

Abstract

The invention discloses a high-strength, high-toughness and corrosion-resistant iron-nickel-based high-temperature alloy and a preparation method thereof. The iron-nickel-based high-temperature alloy is prepared from the components including, by weight, 30%-35% of Fe, 16%-22% of Cr, less than or equal to 0.8% of Mo, 0.1%-0.8% of W, 1.5%-2.3% of Ti, 1.2%-2.2% of Al, less than or equal to 1.0% of Mn, less than or equal to 0.2% of Nb, less than or equal to 0.1% of Si, 0.03%-0.10% of C, 0.001%-0.005% of B, 0.01%-0.04% of Zr, less than or equal to 0.01% of P and the balance Ni, the weight percentage of Ti and Al is 2.8%-4%, and the ratio of Ti to Al is 1%-1.5%. The iron-nickel-based high-temperature alloy is high in endurance strength, high in impact toughness and good in corrosion resistance; a gamma' phase and M23C6 are main strengthening phases; compared with the prior art, the alloy has the advantages of equivalent processing performance, lower material cost and more excellent structure stability, high-temperature strength, impact toughness and corrosion resistance, and can be used for manufacturing high-temperature components such as high-temperature superheaters and reheaters of ultra-supercritical thermal power generating units at the temperature of 650 DEG C or above, main steam pipelines, headers, blades, fasteners and the like.

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, corrosion-resistant iron-nickel-based superalloy and a preparation method thereof. Background technique [0002] Coal-fired thermal power units provide more than 70% of my country's electricity. It is expected that for a long time in the future, the situation dominated by coal power will be difficult to change. However, the average power generation efficiency of thermal power units in my country is low and energy consumption is relatively high. Sulfur dioxide, nitrogen oxides, NOx major sources of emissions of carbon dioxide and mercury. The Chinese government promises to reduce carbon dioxide emissions per unit of GDP by 40-45% on the basis of 2005 by 2020, and to achieve carbon neutrality by 2060. In the field of coal power, adopting high-parameter and large-capacity thermal power units is one of the most dire...

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Problems solved by technology

[0002] Coal-fired thermal power units provide more than 70% of my country's electricity. It is expected that for a long time in the future, the situation dominated by coal power will be difficult to change. However, the average power generation efficiency of thermal power units in my country is low and energy consumption is relatively high. Sulfur dioxide, nitrogen oxides, NOx major sources of emissions of carbon dioxide and mercury

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