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CN-117443980-B - TB5 titanium alloy wire and cold drawing preparation method thereof

CN117443980BCN 117443980 BCN117443980 BCN 117443980BCN-117443980-B

Abstract

The invention belongs to the technical field of alloy preparation, and particularly relates to a TB5 titanium alloy wire and a cold drawing preparation method thereof, wherein the method comprises the steps of firstly selecting a large deformation amount and a lower processing temperature for forging and cogging and rolling of a TB5 titanium alloy, effectively ensuring that coarse tissues are crushed to a certain extent, improving internal tissues and improving plasticity, then peeling to remove surface oxide skin of the TB5 titanium alloy wire so as to avoid introducing oxygen, hydrogen, nitrogen and carbon elements, then adopting online solution treatment to carry out tissue regulation and control so as to improve cold processing performance and tissue uniformity of the wire, then carrying out cold processing diameter reduction on the wire by roller die drawing, effectively avoiding the problems of mucous membrane, wire surface scratch and the like, prolonging the service life of a drawing die, simultaneously ensuring that the grain size and tissue uniformity of the TB5 titanium alloy wire are good and meeting the use requirements, and finally preparing the TB5 titanium alloy wire in a state can be directly delivered and used for subsequent processing.

Inventors

  • WANG ZELONG
  • SUN SIBO
  • LIU ZHENGLIN
  • FENG ZHAOLONG

Assignees

  • 成都先进金属材料产业技术研究院股份有限公司

Dates

Publication Date
20260505
Application Date
20230914

Claims (9)

  1. 1. A method for preparing a TB5 titanium alloy wire by cold drawing, which is characterized by comprising the following steps: Forging and cogging the pretreated TB5 cast ingot by three fires to obtain a titanium blank, wherein the forging and cogging comprises first fire forging, second fire forging and third fire forging, the first fire forging adopts a three-heading and three-drawing mode, the second fire forging adopts a two-heading and two-drawing mode, and the third fire forging adopts a one-heading and one-drawing mode; Polishing the titanium blank, and then performing secondary rolling to obtain a crude wire rod, wherein the rolling deformation amount is 75% in the first secondary rolling pass of 13 times, and the rolling deformation amount is 90-92% in the second secondary rolling pass of 8 times; Carrying out rounding and skinning on the crude wire rod in sequence, and carrying out annealing heat treatment on the skinned crude wire rod by adopting an online protective atmosphere heat treatment furnace to obtain the wire rod, wherein the annealing temperature is 700-750 ℃; The wire rod is drawn to a wire rod with a finished product size by adopting a roller die drawing mode, and concretely, a water-soluble lubricant is coated on the wire rod after annealing heat treatment, the single-pass deformation is 20-25%, the drawing speed is 1.5 m/s, intermediate heat treatment annealing is carried out once after 4-5 times of drawing passes are accumulated, then the wire rod is continuously drawn to the finished product size, the wire rod is phi 1.20 mm-phi 4.50mm, ultrasonic cleaning and online protective atmosphere solution treatment are sequentially carried out on the wire rod, and the finished product TB5 titanium alloy wire rod is obtained after time-efficient treatment, wherein the online protective atmosphere solution treatment is carried out by adopting an online protective atmosphere heat treatment furnace, and the treatment temperature is 730-780 ℃.
  2. 2. The method for preparing TB5 titanium alloy wire by cold drawing according to claim 1, wherein, The pretreatment comprises the steps of peeling and riser removal of the TB5 cast ingot.
  3. 3. The method for preparing TB5 titanium alloy wire by cold drawing according to claim 1, wherein, The forging conditions of the first fire forging are that the initial forging temperature is 1100-1150 ℃, the heat preservation is carried out for 3 hours, the final forging temperature is more than 800 ℃, and the deformation of upsetting and drawing is 65-70%; The forging conditions of the second hot forging are that the initial forging temperature is 1050-1100 ℃, the heat preservation is carried out for 3 hours, the final forging temperature is more than 700 ℃, and the deformation of upsetting and drawing is 60-65%; The forging conditions of the third fire forging are that the initial forging temperature is 950-1050 ℃, the heat preservation is carried out for 3 hours, the final forging temperature is more than 600 ℃, and the deformation of upsetting and drawing is 60-65%.
  4. 4. The method for preparing the TB5 titanium alloy wire by cold drawing according to claim 1, wherein the polishing of the titanium blank is specifically as follows: Polishing the surface of the titanium blank until the surface has metallic luster and no macroscopic defect, and then placing the titanium blank into a heating furnace for heating, wherein two-fire blank rolling is adopted in rolling; The rolling adopts a twice-fired rolled blank specifically comprises the following steps: The first hot rolling temperature is 900-950 ℃, the heat preservation time is 2h, the rolling speed is 3m/s, and the final rolling size is phi 60mm; The second hot rolling temperature is 850-900 ℃, the heat preservation time is 2h, the rolling speed is 2.5m/s, and the final rolling size is phi 16mm.
  5. 5. The method for preparing the TB5 titanium alloy wire by cold drawing according to claim 1, wherein the method is characterized in that the crude wire rod is rounded specifically by hot drawing and rounding at 780 ℃ by a hot drawing machine, the ear defect on the surface of the material is removed, and the size of the rounded wire rod is phi 15.5mm; The rough wire rod is peeled, namely, a centreless grinding lathe is adopted for the wire rod after rounding, oxide skin and surface defects on the surface of the material are removed, and the size of the peeled wire rod is phi 14.5mm.
  6. 6. The method for preparing the TB5 titanium alloy wire by cold drawing according to claim 1, wherein the on-line protective atmosphere annealing heat treatment of the peeled crude wire rod is specifically as follows: the travelling speed of the crude wire rod in the online protective atmosphere heat treatment furnace is 6-7 m/min, the crude wire rod is cooled by spraying water cooling, and the protective gas is high-purity argon with the concentration of 99.999%.
  7. 7. The method for preparing TB5 titanium alloy wire by cold drawing according to claim 1, wherein, The wire is subjected to ultrasonic cleaning, specifically, the heating temperature of ultrasonic cleaning is 50-60 ℃, the cleaning time is 2-3 h, the ultrasonic frequency is 3-5 kHz, and the cleaning medium is a water cleaning agent; the online protective atmosphere solution treatment is that the travelling speed of the wire in an online protective atmosphere heat treatment furnace is 4-6 m/min, spray water cooling is adopted for cooling, and the protective gas is high-purity argon with the concentration of 99.999%; the ageing treatment adopts a vacuum heat treatment furnace, the heating temperature is 500-550 ℃, the heat preservation time is 6-8 h, and the cooling mode is furnace cooling.
  8. 8. A TB5 titanium alloy wire prepared by the cold drawing process of any one of claims 1 to 7.
  9. 9. A TB5 titanium alloy wire according to claim 8, wherein the specification of the TB5 titanium alloy wire is Φ1.20mm to Φ4.50mm.

Description

TB5 titanium alloy wire and cold drawing preparation method thereof Technical Field The invention belongs to the technical field of alloy preparation, and particularly relates to a TB5 titanium alloy wire and a cold drawing preparation method thereof. Background TB5 (Ti-15V-3 Cr-3Sn-3 Al) is a beta-type titanium alloy and has the characteristics of small density, high specific strength, strong corrosion resistance, excellent cold-adding performance, superelastic performance and the like, so that the beta-type titanium alloy is mainly applied to a plurality of fields of medical treatment, electronics, spectacle frames and the like. With the rapid development of the titanium alloy industry and the continuous increase of the requirements for advanced titanium alloy wires, TB5 titanium alloy wires have been applied to the market in recent years. However, the batch stability and the tissue uniformity of the quality of different TB5 titanium alloy wire products have certain differences. The traditional wiredrawing preparation process of the TB5 titanium alloy wire comprises fixed die hot drawing, heat treatment, acid washing and polishing, and the preparation process is mostly delivered by wire rods and machining surfaces. The TB5 wire produced by the hot drawing process has the problems of (1) low drawing speed of a fixed die, small reduction of single-pass, long processing procedure and low production efficiency, (2) high possibility of absorbing harmful elements such as nitrogen, hydrogen and oxygen in the air by the wire in a heated state due to heating temperature of 700-800 ℃ during hot drawing, and reduction of material performance consistency, (3) high sliding friction force between a fixed die and the wire during drawing, easy increase of dimensional tolerance of the wire and strain on the surface of the wire to form a consistent quality defect, and (4) high energy consumption and high pollution of wire preparation due to the mode of removing graphite or phosphoric lubricant on the surface of the wire by electrolytic polishing or acid washing after the wire drawing is completed. Disclosure of Invention Aiming at the problems, the invention provides a TB5 titanium alloy wire and a cold drawing preparation method thereof, which are characterized in that firstly, large deformation and lower processing temperature are selected for forging cogging and rolling of a TB5 titanium alloy, a certain degree of fragmentation of coarse tissues is effectively ensured, internal tissues are improved, plasticity is improved, peeling is carried out to remove surface oxide skin of the TB5 titanium alloy wire rod, oxygen, hydrogen and carbon elements are prevented from being introduced, then online solution treatment is adopted for carrying out tissue regulation and control to improve cold processing performance and tissue uniformity of the wire rod, and then cold working and reducing are carried out on the wire rod by roller die drawing, so that the problems of surface scratches of mucous membranes and the wire rod can be effectively avoided, the service life of a drawing die is prolonged, meanwhile, the grain size and the tissue uniformity of the TB5 titanium alloy wire rod are both good and meet the use requirements, and finally the TB5 titanium alloy wire rod is prepared for direct delivery in a bright state and for subsequent processing. The specific technical scheme is as follows: The invention has the beneficial effects that: According to the method, the TB5 titanium alloy wire is prepared by adopting a roller die drawing method, and most of sliding friction between the material and the die hole during the drawing of the fixed die is changed into rolling friction of the bearing, so that the tensile friction force is greatly reduced, the drawing process is more labor-saving, and the efficiency is higher. Meanwhile, the method has the advantages of high speed reducing, large total compression ratio, high dimensional accuracy, good tissue uniformity and the like, further improves the production efficiency and the product rate of the TB5 titanium alloy wire, and meets the requirements of civil markets on the TB5 titanium alloy material. The invention selects large deformation and lower processing temperature in the forging cogging and rolling processes, effectively ensures that coarse tissues are crushed to a certain extent, improves internal tissues and improves plasticity, and the whole wire flow does not need acid washing and electrolysis-free production flow, is environment-friendly, has no hydrogen increasing, oxygen increasing and nitrogen increasing processes and has high component purity. Compared with the common vacuum heat treatment furnace, the method has the advantages of low cost, low energy efficiency, high efficiency and convenient operation and maintenance. Compared with the traditional hot drawing, the method for preparing the TB5 titanium alloy wire by adopting the roller die drawing method has the advan