Study On Preparation Technology Of High Strength Ti-6Al-4V Titanium Alloy Wire

           Study on preparation technology of high strength
                            Ti-6Al-4V titanium alloy wire

Titanium and titanium alloys have low elastic modulus, corrosion resistance, excellent biological and mechanical compatibility, which are widely used in surgical implants. In recent years on biomedical titanium alloys are a lot of reports and specifications of products mainly in bars, used in surgical trauma with plate and screw fixation. The fracture fragment fixation is very effective. For short fractures or avulsion fractures and other stress is not a fixed, the use of filaments produced by the needle, the diameter of 0.8 ~ 2.5mm. Ti-6Al-4V titanium alloy is an ideal material for surgical implants because of its excellent mechanical properties, such as high strength, high toughness and so on. In order to achieve a good effect of the fixed connection, the material must have high tensile strength, but also need good plastic and bending properties. The traditional method of using stainless steel wire drawing processing, but the material plasticity is poor, less than 5% elongation, bending property is very poor. The Ti-6Al-4V titanium alloy, reasonable regulation and control of the alloy of the interstitial oxygen through using the rolling billet hot drawing methods, preparation of the super high strength of titanium alloy (Ti-6Al-4V) straight wire and analysis with different oxygen contents and process control effect on the mechanical properties of the material, in order to obtain the best preparation method.

Ti-6Al-4V Alloy with nominal composition, blending, pressing electrode, by vacuum consumable remelting of a series of phi 460mm ingot. Ingot forged by the beta phase heating open billet diameter 220mm * 400mm test forging, forging the final forging temperature is generally Ti-6Al-4V titanium alloy ingot temperature slightly lower open, about 800 degrees. On diameter 220mm * 400mm forging billet by alpha + beta intercritical forging, large deformation controlled rolling into 8 mm in diameter of blank; and then die hole temperature controlled drawing of three specifications of diameter of 1mm, 2mm, Phi 2.5mm titanium alloy wire, analysis of effects of different materials and process parameters of Ti-6Al-4V titanium alloy wire force performance. The acid ratio of V (HF:: HNO3:: H2O) =1: 3: 10 acid ratio corrosion of Ti-6Al-4V titanium alloy. Through the large deformation in two-phase region temperature control of hot rolled, Ti-6Al-4V alloy grain refinement temperature controlled drawing to obtain ultrafine grain wire, grain about 0.5 mu m; and with the refinement of the oxygen content in the alloy increased, drawing specifications, improve the mechanical properties of the wire plastic drop; comprehensive comparison, it is found that the containing oxygen 0.14wt% Ti-6Al-4V diameter 2.0mm silk material tensile strength and plasticity reached 1270mpa and 12%, excellent comprehensive mechanical properties, very suitable for the application in the medical Klinefelter needle products. Ultrafine grained Ti-6Al-4V wire is a ductile fracture along the alpha phase at room temperature, which is the key point to obtain high strength.