A kind of vanadium alloy with high strength and high toughness and preparation method thereof

Abstract

The invention discloses a high-strength high-toughness vanadium alloy which comprises the following components in percentage by weight: 3.2-6.0 wt% of Cr (chromium), 3.2-6.0 wt% of Ti (titanium), and 0.1-4.0 wt% of Y (yttrium) and Zr (zirconium). The preparation method comprises the following steps: after adding the Y element and Zr element on the basis of a V-Cr-Ti three-component alloy system, carrying out smelting, homogenizing treatment, coating, hot deformation, annealing, cold deformation, recrystallization annealing and the like to synthesize the V-Cr-Ti-(Y+Zr) alloy. The vanadium alloy gives consideration to the strength and toughness at both room temperature and high temperature, and can be used as a potential structural material for fusion reactors and fission reactors. The preparation method can be used for large-scale production of the vanadium alloy.

Description

technical field [0001] The invention relates to the field of metal materials and metal material processing, in particular to a high-strength and high-toughness vanadium alloy and a preparation method thereof. Background technique [0002] Vanadium alloy is an alloy composed of vanadium-based and other alloying elements. Compared with other structural materials, it has the advantages of high-temperature strength, low ductile-brittle transition temperature, and excellent low activation characteristics. Therefore, it is the first in fusion reactors. Alloy materials are preferred for structures such as walls, cladding, and divertors, and are most likely to be used in Li / V cladding. After systematic and in-depth research and multiple performance evaluation results, the United States, Japan and other countries first recommended V-4Cr-4Ti as a candidate material for fusion reactor structural materials. However, the room temperature mechanical properties of vanadium alloys in the p...

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Problems solved by technology

However, the room temperature mechanical properties of vanadium alloys in the prior art need to be improved, and they are easy to oxidize or absorb oxygen at high temperatures, resulting in a sharp decline in their mechanical properties at high temperatures, which is manifested in the decrease in their plasticity and toughness. In addition, the hot workability of the alloy will also be adversely affected

[0003] In recent years, a small number of research workers have adopted certain methods to strengthen V-Cr-Ti alloys. For example, the invention patent application document with publication number CN103422039A discloses a method for strengthening V-4Cr-4Ti alloys. Through the combination of certain heat treatment and cold working, the tensile strength at room temperature is 692MPa, and the tensile strength at 700°C is 562MPa. It can be seen that this method significantly improves the strength of V-4Cr-4Ti alloy. However, this method will make the plasticity of the alloy The strengthening phase used in this method is a Ti-(CON) precipitate, which will dissolve in a large amount in the matrix above 700°C, which will seriously affect the mechanical properties of the alloy above 700°C

The invention patent application document with publication number CN103320664 discloses a kind of Ti 3 SiC 2 Dispersion strengthened V-4Cr-4Ti alloy, the room temperature tensile strength of this dispersion strengthened vanadium alloy is ≥600MPa, and the elongation is ≥10%, but Ti 3 SiC 2 It is a kind of ceramic, which cannot be directly added to the vanadium alloy by smelting. The vanadium alloy needs to be prepared by powder metallurgy, and the pure vanadium raw material is easily oxidized during the powder making process, so the preparation process requires harsh production conditions. And the powder metallurgy method is difficult to produce vanadium alloys on a large scale

The invention patent application document with the publication number CN105506428A discloses a V-Cr-Ti-Y vanadium alloy, which is based on the V-Cr-Ti ternary alloy system, and then through simple alloying means, using The strong affinity of the rare earth element Y to oxygen forms rare earth oxides during the smelting process, thereby reducing the content of solid dissolved oxygen in the vanadium alloy and improving the phenomenon of oxygen embrittlement; at the same time, the yttrium oxide formed in the high temperature solution is During the cooling and solidification process of the alloy solution, it can act as a grain refiner and improve the toughness of the alloy. However, it cannot improve the strength of the alloy.

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