Titanium alloy strong toughening treatment method based on pulse current

Abstract

The invention discloses a titanium alloy strong toughening treatment method based on pulse current. The treatment method comprises the following steps that (1) the rolled and annealed titanium alloy is cut into the sheet titanium alloy, the sheet titanium alloy is the alpha and beta type titanium alloy; (2) the sheet titanium alloy was polished on the surface to remove surface oxide or foreign matters, and then the sheet titanium alloy is placed in a tubular furnace protected by argon for solution treatment at 850-950 DEG C for 1-1.5 h and then cooled with water to room temperature; (3) the flaky titanium alloy obtained in the step (2) is subjected to pulse current processing by using an electric pulse device, the parameter is 50 HZ, the voltage is 5-6 V, the current density ranges from 5*10<7> to 7*10<7> A / m<2>, the processing time is in milliseconds, the spacing between electrodes was 30-40 mm, and the flaky titanium alloy is cooled with water to room temperature; and (4) the sheet-shaped titanium alloy subjected to pulse current treatment is placed in the tubular furnace protected by argon atmosphere for artificial aging treatment at 510-540 DEG C for 1-1.5 h. The treatment method has the advantages that the strength of the titanium alloy is greatly improved and the plasticity of the titanium alloy is kept under the condition that the titanium alloy component system is not changed.

Description

technical field [0001] The invention relates to the technical field of material processing and preparation, and is mainly applied to the strengthening and toughening treatment of Ti-6Al-4V titanium alloy. Background technique [0002] Titanium alloy has many advantages such as high specific strength, good corrosion resistance, high temperature resistance and good biocompatibility, and is widely used in many important fields such as aerospace, petrochemical and biomedicine. Among them, Ti-6Al-4V (TC4) is an α+β-type titanium alloy, which belongs to a medium-strength titanium alloy. The structure and properties of this alloy are relatively stable, suitable for large-scale production, and it is the most widely used titanium alloy at present. In recent years, the aerospace field has put forward higher requirements for the strength and plasticity of TC4 titanium alloys due to the need for lightweight aircraft structural parts and fasteners. For α+β titanium alloys, the traditiona...

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Problems solved by technology

However, the deformation resistance of titanium alloy is large, the deformation temperature is high, and the processing temperature range is narrow, so the utilization rate of deformation heat treatment is not high; solution aging treatment is an effective strengthening method for titanium alloy, and its purpose is to precipitate a balanced α phase and The β phase produces precipitation strengthening and improves the strength of titanium alloys

However, both of these two heat treatment methods have the problem of coarse structure caused by long-term high-temperature residence, and cannot achieve ultra-high strength of titanium alloys, and their tensile strength has been fluctuating in the range of 800-1200MPa.

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