Preparation method of high-uniformity boron-containing titanium alloy cast ingot

Abstract

The invention discloses a preparation method of a high-uniformity boron-containing titanium alloy cast ingot. The method comprises the steps that firstly, an AlTiB ternary alloy, titanium sponge and an intermediate alloy are selected as raw materials according to components of a target product boron-containing titanium alloy cast ingot; secondly, after the raw materials are mixed, the raw materials are pressed to obtain electrode blocks; thirdly, the electrode blocks are installed and welded and are cleaned to obtain an electrode group; fourthly, vacuum self-consuming electric arc melting is carried out on the electrode group to obtain a boron-containing titanium alloy cast ingot crude product; and fifthly, the boron-containing titanium alloy cast ingot crude product is machined and sawed, and the high-uniformity boron-containing titanium alloy cast ingot is obtained. The AlTiB ternary alloy is adopted as the raw material, the density of the AlTiB ternary alloy is closer to that of a titanium matrix, the melting point is greatly reduced, the boron content is reduced, the material mixing uniformity and the liquid phase mixing uniformity in the smelting process are effectively improved, the homogenization degree of boron-containing titanium alloy cast ingot components is improved, the local segregation and enrichment risk is reduced, generation of refractory materials and inclusion defects is avoided, and the uniformity of each element is improved.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy ingot preparation, and in particular relates to a method for preparing a highly uniform boron-containing titanium alloy ingot. Background technique [0002] Titanium alloys have the advantages of high specific strength and good corrosion resistance, and their applications in aviation, ships and other fields are gradually expanding. Boron is an additive element that is widely used in the field of metal materials. Reasonable selection of boron content can effectively refine the casting structure of the material, improve thermal processing processability, and deformation uniformity. Therefore, the influence of boron on titanium alloys has been paid more and more attention by researchers. [0003] Most of the existing studies on the microstructure and properties of titanium alloys with boron are aimed at TA5 titanium alloys, Ti1023 titanium alloys, as-cast and rolled Ti-6Al-4V alloys, etc. Li...

AI Technical Summary

Problems solved by technology

However, in the process of industrialized production, the size of alloy ingots is relatively large (ton level), and it is difficult to use boron powder or boron intermediate alloy with high boron content to distribute evenly in large-size ingots, and local segregation and enrichment

According to the titanium-boron alloy phase diagram, when the weight percentage of boron in the titanium ingot is about 20% to 30%, intermetallic compounds with high melting points will be formed, and it is difficult to melt them during the melting process, which may cause defects such as inclusions in subsequent products. Affect the processing and product performance of titanium alloy

Therefore, boron-containing titanium alloys produced by traditional methods have problems such as macrosegregation, poor processability or unqualified product performance.

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