High-strength corrosion-resisting nickel base alloy and manufacturing method thereof

Abstract

The invention relates to a high-strength corrosion-resisting nickel base alloy and a manufacturing method thereof. The high-strength corrosion-resisting nickel base alloy comprises the following chemical components by weight percent: not more than 0.04% of carbon (C), about 20.0%-26.0% of chromium (Cr), about 6.0%-10.0% of cobalt (Co), about 4.0%-8.0% of tungsten (W), not more than 1.0% of molybdenum (Mo), not more than 1.0% of Ferrum (Fe), not more than 0.5% of silicon (Si), not more than 0.5% of manganese (Mn), about 0.8%-1.3% of niobium (Nb), about 0.3%-0.7% of titanium (Ti), about 0.6%-1.0% of aluminum (Al), about 0.1%-0.4% of zirconium (Zr), not more than 0.003% of boron (B), tiny lanthanum (La) or rare-earth element (Re), and the balance of nickel (Ni) and inevitable impurity element. Vacuum melting and electroslag remelting are adopted, and then solution treatment and ageing treatment are performed.

Description

technical field [0001] The invention relates to a high-strength corrosion-resistant nickel-based alloy material, which has a combination of good high-temperature strength, plasticity, high-temperature structure stability, toughness, and oxidation / vulcanization resistance, and can be suitable for large-scale diesel engine valve body materials and oxidation at high temperatures. A pressure-bearing part in a vulcanized environment is a nickel-based alloy that can be cast and welded, and belongs to the technical field of material engineering. Background technique [0002] Nickel-based alloys (Ni-Cr alloys, Ni-Cr-Mo alloys, Ni-Cu alloys, etc.) have absolute advantages over iron-based stainless steels in many complex corrosive environments and high temperature conditions, and are widely used in aerospace, electric power , petrochemical and other fields. [0003] For a long time, it has been the goal of researchers to develop corrosion-resistant alloys for use at higher temperatur...

AI Technical Summary

Problems solved by technology

[0006] In order to meet the new strength and corrosion resistance requirements of high-power advanced diesel engine valves and future ultra-supercritical coal-fired power plant boiler tube alloys, the original ferrite, solid-solution austenite and some age-hardening alloys that have been used in other fields so far Alloys, usually cannot meet the requirements of high temperature strength, maximum service temperature and phase stability, oxidation / sulfurization resistance at the same time

For example, in a typical age-hardening nickel-based alloy, the Cr content of the alloy must be increased to enhance the anti-sulfurization performance, but increasing the Cr content is not only not conducive to the strengthening of the alloy, but also leads to the precipitation of brittle σ phase and μ phase in the alloy if it is added too much Or α-Cr phase formation, increasing the risk of alloy embrittlement

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