Preparation method of V-5Cr-5Ti alloy

Abstract

The preparation method of the V-5Cr-5Ti alloy comprises the following steps of burdening, smelting, forging and heat treatment, specifically, in the burdening step, vanadium chips, chromium sheets and titanium chips are selected, and the weight ratio of the high-purity metal vanadium chips to the high-purity metal chromium sheets to the high-purity titanium chips is 85%-88% to 5%-6% to 8%-10%; according to the heat treatment step, the forged alloy is subjected to heat treatment recrystallization, the grain size after recrystallization is smaller than 100 microns, then the alloy ingot is machined into a regular shape, and the V-5Cr-5Ti alloy ingot is obtained. By means of the method, the uniformity, the mechanical property and the irradiation stability of alloy components can be remarkably improved, inclusion and segregation of an as-cast structure can be effectively eliminated, and the service life of the V-5Cr-5Ti alloy ingot is prolonged. Therefore, the application requirements in extreme environments such as a fusion reactor and the like are met.

Description

Technical Field

[0001] The present invention relates to the technical field of alloy preparation, and in particular to a preparation method of a V-5Cr-5Ti alloy. Background Art

[0002] V-5Cr-5Ti alloy is a solid-solution-strengthened, single-phase vanadium-based alloy composed primarily of 5% chromium (Cr), 5% titanium (Ti), and small amounts of carbon (C), nitrogen (N), and oxygen (O). This alloy is considered a promising material for the primary cladding layer of fusion reactors due to its excellent high-temperature performance, low activation characteristics, and good radiation and corrosion resistance. However, while traditional preparation methods such as vacuum arc melting (VAR) and arc melting can produce high-purity alloys, they suffer from coarse grains, component segregation, and secondary phase precipitation in the as-cast structure, compromising mechanical properties and irradiation stability. Therefore, developing a preparation method that can effectively control the microstructure and improve mechanical properties and irradiation stability is of great significance. Summary of the Invention

[0003] In view of the above defects, the present invention proposes a method for preparing a V-5Cr-5Ti alloy comprising the following steps: Ingredients: Use vanadium chips, chromium chips, and titanium chips, with the weight ratio of high-purity metal vanadium chips 85%-88%: high-purity metal chromium chips 5%-6%: high-purity metal titanium chips 8%-10%; Melting: Press the prepared materials into blocks and put them into the copper crucible of horizontal electron beam furnace, and evacuate to 3~5x10 - 2 Pa, melting power 130 kW, melting speed 2 kg / min, smelting to prepare alloy plates, and then using ingot electron beam furnace, vacuum to 3~5x10 -2 Pa, melting power 160 kW, melting speed 2 kg / min, through two melting ingots, V-5Cr-5TI alloy ingots; Forging: Apply water glass on the surface of the alloy ingot, then heat it to 1000℃ at a rate of 5-10℃ / min, and keep it warm for 30 minutes. After the end of the heat preservation, forge it and control the deformation of each forging pass to be no more than 20%; Heat treatment: The forged alloy is then heat treated for recrystallization. After recrystallization, the grain size is less than 100 μm. The alloy ingot is then processed into a regular shape to obtain a V-5Cr-5Ti alloy ingot.

[0004] This invention provides a method for preparing a V-5Cr-5Ti alloy, utilizing electron beam melting, hot forging, and heat treatment processes to enhance alloy purity and optimize performance. This method not only significantly improves alloy composition uniformity, mechanical properties, and radiation stability, but also effectively eliminates inclusions and segregation in the as-cast structure, thus meeting the requirements of applications in extreme environments such as fusion reactors. DETAILED DESCRIPTION

[0005] The present invention provides a method for preparing a V-5Cr-5Ti alloy, comprising the following steps: Ingredients: Use vanadium chips, chromium chips, and titanium chips, with the weight ratio of high-purity metal vanadium chips 85%-88%: high-purity metal chromium chips 5%-6%: high-purity metal titanium chips 8%-10%; Melting: Press the prepared materials into blocks and put them into the copper crucible of horizontal electron beam furnace, and evacuate to 3~5x10 - 2 Pa, melting power 130 kW, melting speed 2 kg / min, smelting to prepare alloy plates, and then using ingot electron beam furnace, vacuum to 3~5x10 -2 Pa, melting power 160 kW, melting speed 2 kg / min, through two melting ingots, V-5Cr-5TI alloy ingots; Forging: Coat the surface of the alloy ingot with water glass, then heat it to 1000°C at a rate of 5-10°C / min and hold it for 30 minutes. After the holding period, forge it and control the deformation of each forging pass to be no more than 20%. Heat treatment: After forging, the alloy is heat treated for recrystallization. After recrystallization, the grain size is less than 100 μm. Then the alloy ingot is processed into a regular shape to obtain a V-5Cr-5Ti alloy ingot.

[0006] Furthermore, the total content of C, N and O impurities in the V-5Cr-5Ti alloy ingot is 500-800 ppm.

[0007] Furthermore, the relative density of the V-5Cr-5Ti alloy ingot is greater than 99.9%.

[0008] Furthermore, the V-5Cr-5Ti alloy ingot may have a tensile strength of 500-580 MPa, a yield strength of 370-510 MPa, an elongation of 25%, and a reduction of area of ​​62%.

[0009] The above describes the embodiments of the present invention in detail, but the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of this patent.

Claims

1. A method for preparing a V-5Cr-5Ti alloy, characterized in that The following steps are involved: Ingredients: Use vanadium chips, chromium chips, and titanium chips, with the weight ratio of high-purity metal vanadium chips 85%-88%: high-purity metal chromium chips 5%-6%: high-purity metal titanium chips 8%-10%; Melting: Press the prepared materials into blocks and put them into the copper crucible of horizontal electron beam furnace, and evacuate to 3~5x10 -2 Pa, melting power 130 kW, melting speed 2 kg / min, smelting to prepare alloy plates, and then using ingot electron beam furnace, vacuum to 3~5x10 -2 Pa, melting power 160 kW, melting speed 2 kg / min, through two melting ingots, V-5Cr-5TI alloy ingots; Forging: Apply water glass on the surface of the alloy ingot, then heat it to 1000℃ at a rate of 5-10℃ / min, and keep it warm for 30 minutes. After the end of the heat preservation, forge it and control the deformation of each forging pass to be no more than 20%; Heat treatment: The forged alloy is then heat treated for recrystallization. After recrystallization, the grain size is less than 100 μm. The alloy ingot is then processed into a regular shape to obtain a V-5Cr-5Ti alloy ingot.

2. The method for preparing a V-5Cr-5Ti alloy according to claim 1, wherein: The total content of C, N and O impurities in the V-5Cr-5Ti alloy ingot is 500-800 ppm.

3. The method for preparing a V-5Cr-5Ti alloy according to claim 1, wherein: The relative density of the V-5Cr-5Ti alloy ingot is greater than 99.9%.

4. The method for preparing a V-5Cr-5Ti alloy according to claim 1, wherein: The V-5Cr-5Ti alloy ingot may have a tensile strength of 500-580 MPa, a yield strength of 370-510 MPa, an elongation of 25%, and a reduction of area of ​​62%.