Low-cost and high-performance titanium alloy and preparation method thereof

Abstract

The invention relates to a low-cost and high-performance titanium alloy and a preparation method thereof. The alloy is a quaternary titanium alloy which is formed by taking titanium as a main body element and additionally adding three elements. The alloy comprises the following components in percentage by mass: 1-5% of Fe, 0.1-0.4% of O, 0.1-0.3% of B and the balance of titanium and inevitable impurities. The preparation method comprises the following steps: adding the raw materials into a suspended smelting furnace of a cold crucible where argon is introduced in a designed alloy component proportion; repeatedly smelting for several times to obtain cast ingots; cogging and forging the cast ingots above the phase transformation point to form sheared billets; then rolling the sheared billet to form rods; thermally treating the sampled rods; and finally representing structure and performance of the rods. The preparation process is simple in method, and the prepared alloy is uniform in component. The tensile strength reaches over 950MPa, the ductility is not less than 15%, and the percentage reduction of area is not less than 25%. The basic mechanical property of the alloy is equivalent to that of Ti-6Al-4V but the cost has the advantage of over 15% compared with that of the Ti-6Al-4V. The alloy can replace part of titanium alloys which are relatively high in price in some fields.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy materials, and in particular relates to a low-cost high-performance titanium alloy composition design and a preparation method thereof. Background technique [0002] Due to their low density, high specific strength, high temperature resistance, corrosion resistance, non-magnetic, biocompatibility and other excellent properties, titanium and titanium alloys have been widely used in aviation, aerospace, ships and other fields. However, the high cost of titanium limits the use of titanium. And the application scope of titanium alloy, especially in the civil field. At present, most of the alloying elements in industrial titanium alloys use precious metals such as V, Mo, Nb, Zr, Sn and Ta, which makes the cost of titanium alloys remain high and affects the scope of use of titanium alloys. [0003] At present, the ways to reduce the cost of titanium alloys include: reducing the cost of raw mater...

AI Technical Summary

Problems solved by technology

However, the price of Mo is still relatively expensive, so the cost reduction is limited. Only cheap elements with abundant resources such as Fe, Al, Si, Cr, C, O, N and B can achieve the purpose of greatly reducing the cost of titanium alloys.

[0004] The publication number is CN1962913A, and the invention title is "a low-cost titanium alloy with adjustable performance". Eight elements of Al, Fe, Cr, Ni, S, B, C, and Mo are added to titanium, and the alloy Composition by mass fraction: Al: 0-3.5%, Fe: 0.3-2.0%, Cr: 0.1-0.5%, Ni: 0-0.3%, S: 0-1.0%, B: 0-0.5%, C: 0-0.5%, Mo: 0-0.5%, the adjustable range of the mechanical properties of the alloy is: the tensile strength is 350MPa-1250MPa, the elongation is 5%-30%, and the reduction of area is 10%-55%; but the alloy contains Ni and Mo, which are more expensive, increase the alloy cost to a certain extent

[0005] The publication number is CN102828058A, and the invention title is "A Method for Preparation of Low-cost Titanium Alloy". The Chinese invention patent uses Mo-Fe master alloy powder and titanium powder to be uniformly mixed, pressed and then vacuum sintered. The alloy composition is calculated by mass fraction: Fe: 1.5%, Mo: 2.5%, improve the plasticity and fatigue properties of the alloy, the tensile strength reaches more than 850MPa, the elongation is not less than 15%, and the reduction of area is not less than 20%. Alloy cost

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