A kind of aluminum-nickel-tungsten master alloy and preparation method thereof

Abstract

The invention provides a method for preparing an aluminum-nickel-tungsten intermediate alloy, which includes the following steps: selecting nickel rods, aluminum rods, and black tungsten rods as raw materials according to the proportion, and after spot welding the black tungsten rods into a core beam, at the periphery of the core beam Weld nickel rods, and then spot weld aluminum rods on the periphery of the nickel rods to form vacuum consumable arc melting electrodes; perform vacuum consumable arc melting on the vacuum consumable arc melting electrodes twice to obtain intermediate aluminum-nickel-tungsten alloy ingots ; Peel the smelted intermediate aluminum-nickel-tungsten alloy ingot, forge it into a desired shape, and grind it to obtain the aluminum-nickel-tungsten intermediate alloy. The invention also provides an aluminum-nickel-tungsten master alloy with nickel rods, aluminum rods and black tungsten rods as raw materials. The aluminum-nickel-tungsten master alloy obtained by the invention has no tungsten inclusions, no segregation, and uniform composition.

Description

technical field [0001] The invention is applied in the technical field of nickel-based high-temperature alloy processing, and in particular relates to an aluminum-nickel-tungsten master alloy and a preparation method thereof. Background technique [0002] Nickel-based superalloys are widely used in the core parts of the hot end parts of aerospace engines such as blades and casings due to their high temperature resistance, corrosion resistance, and creep resistance. The solid solubility of W element in nickel-based superalloys is high, and the diffusion rate is slow, which can greatly improve the creep resistance of the alloy. Most superalloys for casting and some deformed superalloys contain a large amount of W elements, which are high-temperature alloys. important alloying elements. However, W element itself has a high melting point, reaching 3410°C. How to fully melt and evenly distribute W element into the superalloy is a huge problem for engineers. Al element is also t...

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Problems solved by technology

[0003] The traditional method of preparing high-temperature alloys is to add nickel strips, tungsten strips, aluminum blocks and other elements into a vacuum induction melting furnace for melting. The melting point of the matrix nickel is 1453°C, so the melting temperature is generally around 1500°C, and the melting temperature is too high. High, it is easy to cause volatilization, burning loss or even splashing of light elements represented by Al element, and the chemical composition is difficult to guarantee; moreover, even if the smelting temperature is increased to above 1600 ° C, it is still very low compared with the melting point of W element 3410 ° C, It is difficult to ensure that the W bar is completely melted and fully dissolved in the nickel-based superalloy during the smelting process, and tungsten inclusions are likely to occur. At the same time, the tungsten element dissolved in the nickel-based superalloy is also prone to uneven distribution, that is, segregation. Time solution heat treatment is fully homogenized, so a new smelting method is urgently needed to obtain high-uniformity nickel-based superalloys

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