Preparation process of medical Ti-6Al-7Nb alloy wires for manufacturing Kirschner wires

Abstract

The invention provides a preparation process of medical Ti-6Al-7Nb alloy wires for manufacturing Kirschner wires. Special class-0 titanium sponge is adopted, honorary alloy composition burdening is performed according to marks, electrodes are pressed for assembly and welding, three-time smelting is performed through a vacuum consumable electro-arc furnace to form fai 370 mm alloy ingots; a metallographic phase method is adopted to measure (alpha+beta) / beta phase transformation points (TB) of the alloy ingots; the alloy ingots are subjected to surface scalping, riser ingot bottoms are cut off, a beta phase zone is heated through an electric furnace, cogging and forging are performed through a 2500-tons oil press, surface defect coping is performed, and further a two-phase zone is heated; two-time rolling is performed to form fai 9.5 mm rod and wire blanks, the rod and wire blanks are heated to be lower than the phase transformation points and are repeatedly subjected to heating and multiple-die drawing to form wires commonly used for Kirschner wires of fai 4.0 mm and under through a 30KW drawing machine and a 11 KW drawing machine, and annealing, straightening, polishing and heat treatment are performed. For the high-strength Ti-6Al-7Nb Kirschner wires serving as a medical material for human, the safety and reliability of the wires are especially important. The work-hardening capacity of the Ti-6Al-7Nb wires is the key of high strength achievement through heat treatment strengthening.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal processing, in particular to the preparation of titanium alloys. Background technique [0002] Ti-6Al-7Nb alloy is a widely used and promising alloy for human implants. It has high strength, excellent corrosion resistance, biocompatibility, basically harmless to the human body, and also has the advantages of strong plasticity and excellent abrasiveness. It is precisely because of the potential harmful effects of V in Ti-6Al-4V alloys for conventional human implants that the development of Ti alloys for biological use without V is promoted, and Ti-6Al-7Nb alloys should be conceived. The characteristic of this alloy is that Nb is used instead of V. Its mechanical properties are equivalent to those of Ti-6Al-4V, and its plane fracture toughness is about 10% higher than that of Ti-6Al-4V. Alloy Trends. [0003] At present, there is no report on the production and research of alloy wires fo...

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Problems solved by technology

[0003] At present, the production and research of alloy wires for medical Ti-6Al-7Nb Kirschner wires have not been reported, and domestic clinical applications are all imported, and the price is relatively expensive

Since the tensile strength of wire for this purpose is generally required to be above 1200-1300MPa, it is difficult to achieve alloy preparation

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