Beta-titanium alloy with low cost and easy production and manufacture method thereof

Abstract

The invention creatively discloses a Beta-titanium alloy with low cost and easy production and a manufacture method thereof. Alloy formed by at least two of 6-9 percent of V, 6-12 percent of Cr, 2.5-4.5 percent of Al and 4-12 percent of Zr according to the weight percent is added into Ti, wherein the balance is the Ti and unavoidable impurities, the mechanical property Sigma b of the alloy is 900-1000MPa, Phi is 40-65 percent and the Delta is 8-20 percent. V-Cl-Al master alloy produced by adopting an Al hot method is crushed into 1-5 mm of grains, or metal Cr, sponge Zr and sponge Ti are mixed and then are pressed into a consumable electrode, the consumable electrode is molten for two or three times to form cast ingot in a vacuum consumable electro-arc furnace, the cast ingot is prepared by the titanium alloy material according to the conventional process, and the solution treatment is performed on the titanium alloy material. Because of not containing precious metal elements, the invention is easier to melt and hot-process, greatly lowers the cost and is easier to popularize in the civil field.

Description

technical field [0001] The invention relates to a β-titanium alloy, in particular to a β-titanium alloy which is cheaper than the existing β-titanium alloy, easy to industrialized production, and whose mechanical properties can basically maintain the same level and its manufacturing method. Background technique [0002] Among the titanium alloy systems, β-titanium alloy has the highest specific strength (strength / density) and good cold workability, and was first used for military applications. At present, industrial β-titanium alloys are more and more widely used in civilian fields, such as titanium eyeglass frames, micro mobile TVs, navigators, mobile phones, golf clubs, fishing gear, and human implant materials in recent years. However, in order to stabilize the β-phase, a large amount of refractory high-density elements such as Mo, Nb, Ta, V, etc. are added to the β-type titanium alloy, resulting in a high density of the β-titanium alloy, and it is difficult to produce qu...

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Problems solved by technology

However, the problem with this alloy is that Mo inclusions may also occur, and more importantly, due to the 4.5% Fe content, the possibility of β spots in the alloy is very high, and β spots are absolutely not allowed in aerospace applications.

However, due to the addition of a large amount of V, the oxidation resistance of the alloy decreases, and it is easily contaminated by oxygen, resulting in loose oxide skin, large metal loss during thermal processing and heat treatment, and affected the surface quality and performance of the finished product. Among them, No.14 Alloy is particularly serious, although it has good cold workability and low alloy density, it is costly because it is added with pure metal V or high V-Al

[0005] The No.17-27 alloys in the table are titanium alloys recently developed for human implantation materials. Since harmful elements such as V and Al cannot be added, and Young’s modulus of elasticity similar to that of human bone is required, a large amount of Nb is added. , Ta, Hf, Zr and other metals, among which Nb, Ta, and Hf are refractory, high-density, and high-priced metals. Obviously, the first problem is that it is difficult to alloy them with current industrial production methods, and most of them are currently in the laboratory. stage, the solution to their alloying problems needs breakthroughs in new equipment, new technologies and new processes

In addition, since Nb and Ta are low stable elements of β phase, the addition amount of the alloy in the table is not enough to stabilize the β structure, so their solution treatment must be cooled with ice water, which complicates the heat treatment process

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