High-strength-and-toughness nickel-based corrosion-resistant alloy with ultra low carbon content and sea water corrosion resistance

Abstract

The invention relates to a high-strength-and-toughness nickel-based corrosion-resistant alloy with an ultra low carbon content and sea water corrosion resistance, belonging to the technical field of nickel-based alloys. The alloy comprises the following chemical components in percentage by weight: no more than 0.01% of C, 17.0-21.0% of Cr, 2.8-3.3% of Mo, 0.75-1.30% of Ti, 0.30-0.70% of Al, 4.1-4.4% of Nb, 1.8-2.5% of W, 50.0-55.0% of Ni and the balance of Fe. Through the associated matching design on the contents of the C / Nb / W elements in the components and the second-phase intercoupling action of NbC, TiC and Ni3Nb, Ni3(Al, Ti), on the basis of controlling the reasonable solution strengthening effect and ensuring the high strength of the alloy, the quantity of carbides in the tissue is reduced; the carbide precipitates are further small and uniform in size; the quantity of strengthened precipitate phases having an adverse effect on toughness, plasticity and corrosion resistance is obviously reduced; and the toughness, plasticity and sea water corrosion resistance of the alloy are improved. Thus, the alloy has the comprehensive service properties of high strength, high toughness and excellent corrosion resistance, and is especially applicable to severe corrosive environments such as sea water and the like.

Description

technical field [0001] The invention belongs to the technical field of nickel-based alloys, in particular to an ultra-low-carbon, high-strength and tough nickel-based corrosion-resistant alloy resistant to seawater corrosion, which is suitable for use in marine corrosion environments. Background technique [0002] GH4169 (Inconel 718) alloy (chemical composition weight percent: C 0.020~0.080, Cr 17.0~21.0, Mo 2.8~3.3, Ti 0.75~1.30, Al 0.30~0.70, Nb 4.75~5.50, Ni 50.0~55.0, etc. The age-strengthened nickel-based superalloy represented by Fe) has high high-temperature strength, durability and creep properties, good fatigue resistance, radiation resistance, oxidation resistance, good processing performance, and long-term structural stability. Traditional materials in the aerospace industry are widely used in various types of engines in my country's aviation and aerospace industries. Due to its use as a superalloy, the GH4169 alloy is mainly required to have good high-temperature...

AI Technical Summary

Problems solved by technology

For the traditional GH4169 alloy, its mechanical properties can meet the requirements, but in a corrosive environment, especially in a seawater corrosion-resistant environment, the local corrosion resistance of this type of nickel-based alloy material is relatively poor, and it is no longer suitable for this Long-term use in similar working conditions

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