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High-strength flame-retarded titanium alloy

A technology for flame retardant titanium alloy and titanium alloy, applied in the field of flame retardant titanium alloy, can solve the problems of unpractical application, poor thermal strength of alloy, limitation and the like

Active Publication Date: 2015-01-28
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

AlloyC alloy has high strength and good plasticity, but because the element V must be added in the form of pure vanadium or V-Cr or Ti-V master alloy, its cost is high and its application is greatly limited
BTT-1 and BTT-3 alloys have poor thermal strength and cannot be used at higher temperatures, and have not yet been practically applied

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The nominal composition of the titanium alloy in this embodiment is Ti-35V-8Nb-4Mo-4W-8Al, that is, by weight percentage: V 35%, Nb 8%, Mo 4%, W 4%, Al 8%, the balance Ti and unavoidable impurities, wherein O content is 0.09wt%. The raw materials are selected as follows: Al-85V alloy, niobium plate, Al-70Mo alloy, Ti-30W alloy and 0-grade sponge titanium.

[0017] The preparation method of the titanium alloy of this embodiment is as follows: mix the master alloy (Al-85V alloy, niobium plate, Al-70Mo alloy and Ti-30W alloy) with 0-grade sponge titanium according to the designed composition and press the electrode, and use vacuum self-consumption The alloy ingot was cast into an alloy ingot by three times of melting in an arc furnace. The measured content of O in the alloy ingot was 0.09%. The alloy ingot was forged at 1100°C for four times to obtain an alloy round rod with a diameter of 60mm. The alloy round rod was annealed at 900°C / 60min used later.

[0018] The room...

Embodiment 2

[0020] The nominal composition of the titanium alloy of this embodiment is Ti-30V-12Nb-5Mo-3Ta-9Al, that is, by weight percentage: V 30%, Nb 12%, Mo 5%, Ta 3%, Al 9%, the balance Ti and unavoidable impurities, wherein the O content is 0.10wt%. The raw materials selected are: Al-85V alloy, Al-70Nb alloy, niobium plate, molybdenum powder, Ti-40Ta alloy and 0-grade sponge titanium.

[0021] The preparation method of the titanium alloy of this embodiment is as follows: mix the master alloy (Al-85V alloy, Al-70Nb alloy, niobium plate, molybdenum powder and Ti-40Ta alloy) with 0-grade sponge titanium according to the designed composition and press the electrode, and use vacuum The alloy ingot was cast into an alloy ingot by three times of smelting in a consumable electric arc furnace. The measured content of O in the alloy ingot was 0.10%. The alloy ingot was forged four times at 1200°C to obtain a 70mm alloy square rod. Used after annealing treatment.

[0022] The room temperatur...

Embodiment 3

[0024] The nominal composition of the titanium alloy of this embodiment is Ti-27V-15Nb-4Mo-2Ta-2W-10Al, that is, by weight percentage: V 27%, Nb 15%, Mo 4%, Ta 2%, W 2%, Al 10%, the balance is Ti and unavoidable impurities, and the O content is 0.12wt%. The raw materials are: Al-85V alloy, Al-70Nb alloy, niobium plate, molybdenum powder, Ti-40Ta alloy, Ti-30W alloy and 0-grade sponge titanium.

[0025] The preparation method of the titanium alloy of this embodiment is: mix the intermediate alloy (Al-85V alloy, Al-70Nb alloy, niobium plate, molybdenum powder, Ti-40Ta alloy and Ti-30W alloy) with 0-grade sponge titanium according to the designed composition Press the electrode, use the vacuum consumable electric arc furnace for primary melting, then use the vacuum consumable arc furnace for secondary melting, and finally carry out three melting in the vacuum consumable electric arc furnace to make alloy ingots. The measured content of O in the alloy ingots is 0.12%, the alloy i...

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Abstract

The invention discloses high-strength flame-retarded titanium alloy which comprises the following components in weight percent: 35% to 45% of V and Nb, 18% to 12% of Al, smaller than or equal to 8% of (Mo, Ta and W), smaller than or equal to 0.12% of O, and the balance of Ti and inevitable impurities, wherein V is greater than or equal to 20% and smaller than or equal to 35%, Nb is greater than or equal to 8% and smaller than or equal to 20%, Mo is smaller than or equal to 5%, and W is smaller than or equal to 4%; high strength refers to that the tensile strength of titanium alloy is greater than or equal to 900 MPa at room temperature. The tensile strength of the high-strength flame-retarded titanium alloy is more than 900 MPa at room temperature, and the tensile strength is more than 680 MPa at 600 DEG C, the flame retardant property of the high-strength flame-retarded titanium alloy is slightly worse than that of Alloy C but remarkably better than that of Ti-6Al-4V titanium alloy, the cost of the high-strength flame-retarded titanium alloy is remarkably lower than that of ALLOY C, and the plasticity of the high-strength flame-retarded titanium alloy is better than that of Ti3Al and that of TiAl alloy.

Description

technical field [0001] The invention belongs to the technical field of flame-retardant titanium alloys, in particular to a high-strength flame-retardant titanium alloy. Background technique [0002] Titanium alloy is an important lightweight material that must be used in aero-engines to reduce structural weight and increase thrust-to-weight ratio, and it cannot be replaced for a long time. However, titanium alloy has the physical characteristics of low thermal conductivity, high heat of oxidation and high heat of combustion, which makes it easy to catch fire and burn in the application environment of aero-engines (high temperature, high-speed airflow and friction). Once a "titanium fire" occurs, the engine can be burned within a few seconds, causing a tragedy of machine crash and death in an instant, with extremely serious consequences. The United States and Russia have actively carried out research on titanium combustion since the 1970s, and have developed their own flame-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C30/00
Inventor 葛鹏吴欢李倩赵永庆辛社伟
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH