CN115647089A - Preparation method of equiaxed ultrafine-grained TC4ELI material and equiaxed ultrafine-grained TC4ELI material - Google Patents
Preparation method of equiaxed ultrafine-grained TC4ELI material and equiaxed ultrafine-grained TC4ELI material Download PDFInfo
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Abstract
The invention discloses a preparation method of an equiaxed ultrafine grained TC4ELI material and the equiaxed ultrafine grained TC4ELI material prepared by the preparation method. The preparation method of the equiaxial ultra-fine grain TC4ELI material comprises the following steps: processing a Ti-6Al-4V ELI bar serving as an initial sample into an equiaxial ultrafine grain Ti-6Al-4V ELI bar by a large plastic deformation method; and hot-drawing the non-equiaxial ultra-fine grain Ti-6Al-4V ELI bar to elongate the length of the non-equiaxial ultra-fine grain Ti-6Al-4V ELI bar so as to obtain the equiaxial ultra-fine grain TC4ELI material. With reference to the test example and fig. 4, the average grain size of the equiaxed ultrafine crystal TC4ELI material prepared by the method for preparing equiaxed ultrafine crystal TC4ELI material of the present invention is 0.8 ± 0.1 μm, and the grain isotropic size is uniform and is equiaxed ultrafine crystal. Therefore, the preparation method of the equiaxed ultrafine grained TC4ELI material can be used for preparing the equiaxed ultrafine grained TC4ELI material.
Description
Technical Field
The invention relates to the field of titanium alloy processing, in particular to a preparation method of an equiaxial ultrafine crystal TC4ELI material and the equiaxial ultrafine crystal TC4ELI material prepared by the preparation method of the equiaxial ultrafine crystal TC4ELI material.
Background
The TC4ELI material (low-clearance element Ti-6Al-4V alloy) is a titanium alloy material recorded in GB/T3620.1-2007 titanium and titanium alloy brands and chemical compositions. The TC4ELI material is more stable because the impurity content is less than that of the common Ti-6Al-4V alloy, and is always the most widely applied biomedical titanium alloy. The TC4ELI material has high strength, corrosion resistance, nontoxicity, high biocompatibility and high fatigue strength. The bar is used for manufacturing products such as wound fixing materials, bone joints, intramedullary nails and the like, and the wire is used for manufacturing products such as dental implant systems, bone screws, kirschner wires, ultrasonic knife heads and the like. GB/T13810-2017 stipulates that TC4ELI bar material refers to a round bar or a flat bar with the diameter of 7.0 mm-90.0 mm, and wire material refers to a round wire with the diameter of 0.5 mm-7.0 mm. For TC4ELI alloys, grain refinement is a key factor in achieving high strength and high fatigue strength, and generally the finer the grain size, the better the strength and fatigue properties. When the grain size is less than 1 μm, the ultra-fine crystal TC4ELI material can be obtained, the mechanical property of the material can be obviously improved, and the method is an effective method for improving the durability and stability of TC4ELI medical instruments. The crystal grain size of TC4ELI can be reduced to below 1 μm by using severe plastic deformation technology, such as high-pressure torsion, equal-diameter corner extrusion and the like.
The TC4ELI bars and wires currently used for manufacturing medical instruments are not ultra-fine grain products, but are common coarse grain products (grain size >1 μm). Therefore, instruments made of non-ultra-fine grained materials have the potential to have fracture incidents, such as intramedullary nail fracture, bone screw fracture, ultrasonic blade bit fracture, and the like.
The conventional thermal mechanical processing method is currently utilized in the industry, and the technological processes for preparing large-size TC4ELI bars and wires sequentially comprise vacuum melting, cogging forging, precision forging, rolling, hot drawing, shearing, straightening and annealing to obtain cylindrical TC4ELI titanium alloy bars and wires with the section diameter of 1-8 mm, but the conventional method can meet the requirement of large-scale production, but cannot obtain ultrafine crystal structures and corresponding excellent performances.
The grain size of the domestic product of the TC4ELI material commonly seen in the industry at present is usually larger than 10 mu m, the grain size of the imported product is about 5 mu m, the grain size of the imported product is more than 1 mu m, and the imported product is not ultra-fine grain TC4ELI material. The ECAP-Conform technology combined with the severe plastic deformation and the continuous extrusion technology can process large-size ultrafine crystal TC4ELI bars, but the accumulated strain is small in a single processing process, repeated extrusion is carried out, and finally the prepared ultrafine crystal TC4ELI material is not an isometric crystal TC4ELI material.
That is, there is no method available in the prior art for preparing equiaxed ultrafine grained TC4ELI materials.
Disclosure of Invention
In view of the above, it is necessary to provide a method for producing an equiaxed ultrafine grained TC4ELI material, which can produce an equiaxed ultrafine grained TC4ELI material.
In addition, it is necessary to provide an equiaxed ultrafine grained TC4ELI material prepared by the above method for preparing an equiaxed ultrafine grained TC4ELI material.
A preparation method of an equiaxial ultrafine crystal TC4ELI material comprises the following steps:
processing a Ti-6Al-4V ELI rod with the diameter of 2-20 mm serving as an initial sample into an isometric superfine crystal Ti-6Al-4V ELI bar by a large plastic deformation method;
and (2) thermally drawing the non-equiaxial ultrafine-grained Ti-6Al-4V ELI bar at 550-750 ℃ to elongate the length of the non-equiaxial ultrafine-grained Ti-6Al-4V ELI bar by 2-20 times to obtain an equiaxial ultrafine-grained TC4ELI material with the diameter of 1-8 mm.
In one embodiment, in the operation of hot-drawing the non-equiaxial ultra-fine grain Ti-6Al-4V ELI bar at 550-750 ℃, the drawing speed of the hot-drawing is 1-10 m/min.
In one embodiment, in the operation of hot-drawing the non-equiaxial ultra-fine grain Ti-6Al-4V ELI bar at 550-750 ℃, the lubricant for hot-drawing is graphite emulsion, and the die for hot-drawing is a tungsten steel die.
In one embodiment, the Ti-6Al-4V ELI rod is further subjected to heat preservation at 1000-1100 ℃ for 30-120 min and water cooling to room temperature.
In one embodiment, the large plastic deformation method is selected from at least one of high pressure twisting, constant diameter angular pressing, multi-directional forging, and stack rolling.
In one embodiment, the processing of the initial sample into non-equiaxed ultra-fine grained Ti-6Al-4V ELI rods by a large plastic deformation process is performed by:
providing an equal-diameter corner extrusion die, wherein a corner channel is arranged on the equal-diameter corner extrusion die and comprises a first linear channel and a second linear channel which are sequentially connected, the diameter of the first linear channel, the diameter of the second linear channel and the diameter of the initial sample are the same, and the included angle between the first linear channel and the second linear channel is 90-160 degrees;
and sequentially passing one end of the initial sample through the first linear channel and the second linear channel until the other end of the initial sample is separated from the second linear channel, rotating the initial sample by 90-180 degrees by taking the length direction of the initial sample as a rotating shaft, sequentially passing one end of the initial sample through the first linear channel and the second linear channel again until the other end of the initial sample is separated from the second linear channel, and repeating the steps of rotating the initial sample and sequentially passing through the first linear channel and the second linear channel for 2-6 times, so that the initial sample is processed into the non-isometric crystal Ti-6Al-4V ELI bar by a method of equal-diameter corner extrusion.
In one embodiment, the junction between the first linear passage and the second linear passage is a fillet, the radius of the fillet is the diameter of the first linear passage, and the radian of the fillet is 20-60 °.
In one embodiment, in the operation of processing the initial sample into the non-isometric ultra-fine grain Ti-6Al-4V ELI bar material by the equal-diameter corner extrusion method, the processing speed of the initial sample is 1mm/s to 10mm/s, the processing temperature of the initial sample is 300 ℃ to 500 ℃, and the processing lubricant of the initial sample is molybdenum disulfide.
In one embodiment, the first linear channel and the second linear channel have an included angle of 120 °.
The equiaxed ultrafine grained TC4ELI material is prepared by the preparation method of the equiaxed ultrafine grained TC4ELI material.
With reference to the test example and fig. 4, the average grain size of the equiaxed ultrafine-grained TC4ELI material prepared by the method for preparing equiaxed ultrafine-grained TC4ELI material of the present invention is 0.8 ± 0.1 μm, and the grain isotropic size is uniform and is equiaxed ultrafine grain. Therefore, the preparation method of the equiaxed ultrafine grained TC4ELI material can be used for preparing the equiaxed ultrafine grained TC4ELI material, the length of the equiaxed ultrafine grained TC4ELI material can exceed 500mm, the diameter of the equiaxed ultrafine grained TC4ELI material is 1 mm-8 mm, and the equiaxed ultrafine grained TC4ELI material has a larger size.
Compared with the prior art, the preparation method of the equiaxial ultrafine crystal TC4ELI material combines a large plastic deformation method and hot drawing, and can realize low-cost and large-scale preparation of large-size equiaxial ultrafine crystal TC4ELI material.
In addition, the preparation method of the equiaxial ultrafine crystal TC4ELI material provided by the invention has the advantages that the large plastic deformation method, the hot drawing technology and the like related to the preparation method and the adopted Ti-6Al-4V ELI rod hardly pollute the environment, the operation is simple and easy, and the mass production can be realized by using the existing industrial production equipment.
In addition, the equiaxed ultrafine grained TC4ELI material prepared by the preparation method of the equiaxed ultrafine grained TC4ELI material can be used as a soft tissue cutting ultrasonic scalpel bit or a dental implant raw material, and compared with a conventional non-ultrafine grained raw material, the prepared product is less prone to fracture.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Wherein:
fig. 1 is a flow chart of a method of preparing an equiaxed ultrafine grained TC4ELI material according to an embodiment.
Fig. 2 is a schematic structural view of an equal-diameter angular extrusion die according to an embodiment.
FIG. 3 is an electron back-scattered diffraction (EBSD) plot of the Ti-6Al-4V ELI rods of example 1.
Fig. 4 is an Electron Back Scattering Diffraction (EBSD) pattern of an equiaxed ultrafine grained TC4ELI material prepared in example 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
One embodiment of a method for preparing an equiaxed ultra-fine grain TC4ELI material as shown in fig. 1 includes the following steps:
s10, processing the initial sample into the non-isometric ultrafine grain Ti-6Al-4V ELI bar material by using a Ti-6Al-4V ELI bar with the diameter of 2-20 mm as the initial sample through a large plastic deformation method.
It should be noted that, in the operation of processing the initial sample into the non-equiaxial ultrafine grain Ti-6Al-4V ELI bar material by the large plastic deformation method, the diameter of the processed non-equiaxial ultrafine grain Ti-6Al-4V ELI bar material is the same as that of the initial sample. I.e. the diameter of the initial sample is kept constant during processing.
Preferably, in the present embodiment, the Ti-6Al-4V ELI rod is further subjected to heat preservation at 900 to 1100 ℃ for 30 to 120min, and then cooled to room temperature by water.
By the operation, a nano-lath structure can be generated in the Ti-6Al-4V ELI rod.
Preferably, in this embodiment, the Ti-6Al-4V ELI rod has a diameter of 10mm.
Generally, the large plastic deformation method is selected from at least one of high-pressure torsion, equal channel angular pressing, multi-directional forging, and cumulative pack rolling.
Specifically, referring to fig. 2, in the present embodiment, the operation of processing the initial sample into the non-equiaxed ultrafine grained Ti-6Al-4V ELI bar material by the large plastic deformation method is as follows:
providing an equal-diameter corner extrusion die 100, wherein a corner channel is arranged on the equal-diameter corner extrusion die 100 and comprises a first linear channel 122 and a second linear channel 124 which are sequentially connected, the diameter of the first linear channel 122, the diameter of the second linear channel 124 and the diameter of an initial sample are the same, and the included angle between the first linear channel 122 and the second linear channel 124 is 90-160 degrees;
one end of the initial sample is sequentially passed through the first linear channel 122 and the second linear channel 124 until the other end of the initial sample is separated from the second linear channel 124, after that, the initial sample is rotated by 90-180 degrees by taking the length direction of the initial sample as a rotating shaft, then one end of the initial sample is sequentially passed through the first linear channel 122 and the second linear channel 124 again until the other end of the initial sample is separated from the second linear channel 124, and the steps of rotating the initial sample and sequentially passing through the first linear channel 122 and the second linear channel 124 are repeated for 2-6 times, so that the initial sample is processed into the non-isometric ultrafine crystal Ti-6Al-4V ELI bar material by an equal-diameter corner extrusion method.
Preferably, in the present embodiment, the connection between the first linear passage 122 and the second linear passage 124 is a fillet 126, the radius of the fillet 126 is the diameter of the first linear passage 122, and the radian of the fillet 126 is 20 ° to 60 °. The provision of the rounded corners 126 may allow the sample to pass more easily through the corner channels.
More preferably, in the present embodiment, the length of the first linear passage 122 is 600mm, and the length of the second linear passage 124 is 600mm.
Preferably, in this embodiment, in the processing of the initial sample into the non-equiaxial ultrafine-grained Ti-6Al-4V ELI bar material by the equal-diameter angular extrusion method, the processing speed of the initial sample is 1mm/s to 10mm/s, the processing temperature of the initial sample is 300 ℃ to 500 ℃, and the processing lubricant of the initial sample is molybdenum disulfide. By adopting the arrangement, the sample can be ensured to be continuously deformed but not cracked.
More preferably, in the present embodiment, the included angle between the first linear channel 122 and the second linear channel 124 is 120 °.
S20, thermally drawing the non-isometric ultrafine crystal Ti-6Al-4V ELI bar at 550-750 ℃ to elongate the length of the non-isometric ultrafine crystal Ti-6Al-4V ELI bar by 2-20 times to obtain the equiaxial ultrafine crystal TC4ELI material with the diameter of 1-8 mm.
The non-equiaxial ultra-fine grain Ti-6Al-4V ELI bar material is subjected to hot drawing operation at 550-750 ℃, so that the growth of crystal grains can be effectively controlled, and ultra-fine grains are kept.
Preferably, in the present embodiment, the drawing rate of the hot drawing is 1m/min to 10m/min in the operation of hot drawing the non-equiaxed ultrafine-grained Ti-6Al-4V ELI bar at 550 ℃ to 750 ℃.
Preferably, in this embodiment, the lubricant for hot drawing is graphite emulsion and the die for hot drawing is a tungsten steel die in the operation of hot drawing the non-isometric ultra-fine grain Ti-6Al-4V ELI bar at 550 ℃ to 750 ℃.
By such an operation, equiaxed crystals can be obtained with maximum efficiency.
With reference to the test example and fig. 4, the average grain size of the equiaxed ultrafine crystal TC4ELI material prepared by the method for preparing equiaxed ultrafine crystal TC4ELI material of the present invention is 0.8 ± 0.1 μm, and the grain isotropic size is uniform and is equiaxed ultrafine crystal. Therefore, the preparation method of the equiaxial ultrafine crystal TC4ELI material can be used for preparing the equiaxial ultrafine crystal TC4ELI material, the length of the equiaxial ultrafine crystal TC4ELI material can exceed 500mm, the diameter of the equiaxial ultrafine crystal TC4ELI material is 1 mm-8 mm, and the equiaxial ultrafine crystal TC4ELI material has a larger size.
Compared with the prior art, the preparation method of the equiaxial ultrafine crystal TC4ELI material combines a large plastic deformation method and hot drawing, and can realize low-cost and large-scale preparation of large-size equiaxial ultrafine crystal TC4ELI material.
In addition, the preparation method of the equiaxial ultrafine crystal TC4ELI material has the advantages that the large plastic deformation method, the hot drawing technology and other technologies related to the preparation method of the equiaxial ultrafine crystal TC4ELI material and the adopted Ti-6Al-4V ELI rod hardly pollute the environment, the operation is simple, and the mass production can be realized by using the existing industrial production equipment.
In addition, the equiaxial ultra-fine grain TC4ELI material prepared by the preparation method of the equiaxial ultra-fine grain TC4ELI material can be used as a soft tissue cutting ultrasonic scalpel head or a dental implant raw material, and compared with a conventional non-ultra-fine grain raw material, the prepared product is less prone to fracture.
The invention also discloses the equiaxed ultrafine grained TC4ELI material prepared by the preparation method of the equiaxed ultrafine grained TC4ELI material.
The following are specific examples.
Example 1
A precious titanium Ti-6Al-4V ELI rod having a length of 60cm and a diameter of 10mm was provided as a starting sample. It should be noted that the Ti-6Al-4V ELI bar, which is a titanium alloy, is obtained from a manufacturer by keeping the temperature at 910 ℃ for 60min and cooling the bar to room temperature by water.
Providing an equal-diameter corner extrusion die 100 as shown in fig. 2, providing a corner channel on the equal-diameter corner extrusion die 100, the corner channel includes a first straight channel 122 and a second straight channel 124 which are connected in sequence, the diameter of the first straight channel 122 and the diameter of the second straight channel 124 are both 10mm, the length of the first straight channel 122 and the length of the second straight channel 124 are both 600mm, the included angle between the first straight channel 122 and the second straight channel 124 is 120 °, the junction between the first straight channel 122 and the second straight channel 124 is a fillet 126, and the radius of the fillet 126 is 10mm of the diameter of the first straight channel 122.
And (3) compressing by a hydraulic press, enabling one end of the initial sample to pass through the first linear channel 122 and the second linear channel 124 in sequence until the other end of the initial sample is separated from the second linear channel 124, rotating the initial sample by 90 degrees clockwise by taking the length direction of the initial sample as a rotating shaft, then enabling one end of the initial sample to pass through the first linear channel 122 and the second linear channel 124 in sequence again until the other end of the initial sample is separated from the second linear channel 124, and repeating the steps of rotating the initial sample clockwise and passing through the first linear channel 122 and the second linear channel 124 in sequence for 4 times, so that the initial sample is processed into the non-isometric ultrafine grain Ti-6 Al-bar V4 ELI 10mm by an isometric corner extrusion method. Wherein the processing speed of the initial sample is 5mm/s, the processing temperature of the initial sample is 450 ℃, and the processing lubricant of the initial sample is molybdenum disulfide.
And (3) thermally drawing the non-isometric superfine crystal Ti-6Al-4V ELI bar at 600 ℃ to elongate the length of the non-isometric superfine crystal Ti-6Al-4V ELI bar by 2.77 times to obtain the isometric superfine crystal TC4ELI material with the length of 166mm and the diameter of 6 mm. Wherein the drawing speed of the hot drawing is 5m/min, the lubricant of the hot drawing is graphite emulsion, and the die of the hot drawing is a tungsten steel die.
Example 2
Providing beta-annealed state of 60cm length and 10mm diameter
Ti-6Al-4V ELI rods were used as the starting samples.
A constant diameter angular extrusion die 100 as shown in fig. 2 is provided.
And (3) enabling one end of the initial sample to pass through the first linear channel 122 and the second linear channel 124 in sequence until the other end of the initial sample is separated from the second linear channel 124, rotating the initial sample by 90 degrees in a counterclockwise way by taking the length direction of the initial sample as a rotating shaft after the completion, then enabling one end of the initial sample to pass through the first linear channel 122 and the second linear channel 124 in sequence again until the other end of the initial sample is separated from the second linear channel 124, and repeating the step 6 times that the initial sample rotates in the counterclockwise way and passes through the first linear channel 122 and the second linear channel 124 in sequence, so that the initial sample is processed into the non-isometric crystal Ti-6Al-4V ELI bar by the equal-radius corner extrusion method. Wherein the processing speed of the initial sample is 5mm/s, the processing temperature of the initial sample is 450 ℃, and the processing lubricant of the initial sample is molybdenum disulfide.
And (3) thermally drawing the non-isometric ultrafine crystal Ti-6Al-4V ELI bar at 700 ℃ to elongate the length of the non-isometric ultrafine crystal Ti-6Al-4V ELI bar by 4 times to obtain the equiaxial ultrafine crystal TC4ELI material with the length of 2.4m and the diameter of 5 mm. Wherein the drawing speed of the hot drawing is 3m/min, the lubricant of the hot drawing is graphite emulsion, and the die of the hot drawing is a tungsten steel die.
Example 3
As a starting sample, a precious titanium Ti-6Al-4V ELI rod in a beta-annealed state, 60cm in length and 10mm in diameter was provided. Note that the Titania Ti-6Al-4V ELI rod purchased from the manufacturer has been subjected to the operations of keeping the temperature at 1050 ℃ for 60min and cooling to room temperature by water.
A constant diameter angular extrusion die 100 as shown in fig. 2 is provided.
And (3) enabling one end of the initial sample to pass through the first linear channel 122 and the second linear channel 124 in sequence until the other end of the initial sample is separated from the second linear channel 124, after the completion, rotating the initial sample by 120 degrees clockwise by taking the length direction of the initial sample as a rotating shaft, then enabling one end of the initial sample to pass through the first linear channel 122 and the second linear channel 124 in sequence again until the other end of the initial sample is separated from the second linear channel 124, and repeating the step 5 times that the initial sample rotates clockwise and passes through the first linear channel 122 and the second linear channel 124 in sequence, so that the initial sample is processed into the non-equiaxed grain Ti-6Al-4V ELI bar material by a constant-radius corner extrusion method. Wherein the processing speed of the initial sample is 5mm/s, the processing temperature of the initial sample is 500 ℃, and the processing lubricant of the initial sample is molybdenum disulfide.
And (3) thermally drawing the non-isometric ultrafine crystal Ti-6Al-4V ELI bar at 650 ℃ to elongate the length of the non-isometric ultrafine crystal Ti-6Al-4V ELI bar by 16 times to obtain the equiaxial ultrafine crystal TC4ELI material with the length of 9.6m and the diameter of 2.5 mm. Wherein the drawing speed of the hot drawing is 4m/min, the lubricant of the hot drawing is graphite emulsion, and the die of the hot drawing is a tungsten steel die.
Test example
The cross sections of the Ti-6Al-4VELI rods of example 1 and the equiaxial ultra-fine grain TC4ELI material prepared in example 1 were observed by back-scattered electron diffraction using a Zeuss Supra 55 field emission scanning electron microscope, respectively, to obtain FIGS. 3 and 4.
As can be seen from FIG. 3, the Ti-6Al-4V ELI rods of example 1 had a grain size of about 7.6. + -. 2.5. Mu.m.
As can be seen from FIG. 4, the crystal grain size of the equiaxed ultrafine grained TC4ELI material prepared in example 1 is about 0.8 + -0.1 μm, and the crystal grain isotropic size is uniform and equiaxed ultrafine grained.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A preparation method of an equiaxial ultrafine crystal TC4ELI material is characterized by comprising the following steps:
processing a Ti-6Al-4V ELI rod with the diameter of 2-20 mm serving as an initial sample into an isometric superfine crystal Ti-6Al-4V ELI bar by a large plastic deformation method;
and thermally drawing the non-equiaxial ultrafine crystal Ti-6Al-4V ELI bar at the temperature of 550-750 ℃ to elongate the length of the non-equiaxial ultrafine crystal Ti-6Al-4V ELI bar by 2-20 times to obtain the equiaxial ultrafine crystal TC4ELI material with the diameter of 1-8 mm.
2. The method of claim 1, wherein the non-equiaxed ultrafine grained Ti-6Al-4V ELI bars are hot-drawn at 550 ℃ to 750 ℃ at a rate of 1m/min to 10m/min.
3. The method of claim 2, wherein the non-equiaxed ultrafine grained Ti-6Al-4V ELI bars are hot-drawn at 550 ℃ to 750 ℃, the lubricant is graphite emulsion, and the die is a tungsten steel die.
4. The method of claim 1, wherein the Ti-6Al-4V ELI rod is further cooled to room temperature by holding at 1000-1100 ℃ for 30-120 min.
5. The method of any of claims 1-4, wherein the large plastic deformation process is selected from at least one of high pressure twisting, constant diameter angular pressing, multi-directional forging, and cumulative pack rolling.
6. The method of manufacturing equiaxed ultrafine grained TC4ELI material according to any one of claims 1 to 4, wherein the processing of the initial sample into non-equiaxed ultrafine grained Ti-6Al-4V ELI bars by means of a large plastic deformation method is performed by:
providing an equal-diameter corner extrusion die, wherein a corner channel is arranged on the equal-diameter corner extrusion die and comprises a first linear channel and a second linear channel which are sequentially connected, the diameter of the first linear channel, the diameter of the second linear channel and the diameter of the initial sample are the same, and the included angle between the first linear channel and the second linear channel is 90-160 degrees;
and sequentially passing one end of the initial sample through the first linear channel and the second linear channel until the other end of the initial sample is separated from the second linear channel, rotating the initial sample by 90-180 degrees by taking the length direction of the initial sample as a rotating shaft, sequentially passing one end of the initial sample through the first linear channel and the second linear channel again until the other end of the initial sample is separated from the second linear channel, and repeating the steps of rotating the initial sample and sequentially passing through the first linear channel and the second linear channel for 2-6 times, so that the initial sample is processed into the non-isometric crystal Ti-6Al-4V ELI bar by a method of equal-diameter corner extrusion.
7. The method of claim 6, wherein the junction between the first linear channel and the second linear channel is a fillet, the radius of the fillet is the diameter of the first linear channel, and the radian of the fillet is 20-60 °.
8. The method of claim 7, wherein the non-isometric ultra-fine grain Ti-6Al-4VELI bar material is processed by constant-diameter angular extrusion at a processing speed of 1 mm/s-10 mm/s, at a processing temperature of 300 ℃ to 500 ℃, and the lubricant is molybdenum disulfide.
9. The method of claim 8, wherein the first linear channel and the second linear channel have an included angle of 120 °.
10. An equiaxed ultrafine grained TC4ELI material, which is characterized in that the equiaxed ultrafine grained TC4ELI material is prepared by the preparation method of the equiaxed ultrafine grained TC4ELI material as claimed in any one of claims 1 to 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116689531A (en) * | 2023-08-09 | 2023-09-05 | 成都先进金属材料产业技术研究院股份有限公司 | Preparation method of high-strength TC4 pipe |
| CN116689531B (en) * | 2023-08-09 | 2023-10-27 | 成都先进金属材料产业技术研究院股份有限公司 | Preparation method of high-strength TC4 pipe |
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