CN113528893A

CN113528893A - TC4ELI titanium alloy for ultrasonic scalpel and production method of titanium alloy bar

Info

Publication number: CN113528893A
Application number: CN202110824060.5A
Authority: CN
Inventors: 贺峰; 曹继敏; 樊亚军; 罗乾伟; 石金虎; 王戈
Original assignee: Xi'an Shengtai Metal Materials Co ltd
Current assignee: Xi'an Shengtai Metal Materials Co ltd
Priority date: 2021-07-21
Filing date: 2021-07-21
Publication date: 2021-10-22

Abstract

The invention belongs to the technical field of medical titanium alloy bars, and provides a TC4ELI titanium alloy for an ultrasonic scalpel and a production method of the titanium alloy bar, which specifically comprise the following steps: the chemical components of the material are as follows: 5.5-6.5% of Al, 3.5-4.5% of V, 0.15-0.25% of Fe, Si: 0.1 to 0.5 percent of titanium, 0.08 to 0.13 percent of O, 0 to 0.05 percent of C, 0 to 0.03 percent of N, 0 to 0.005 percent of H, and the balance of Ti and inevitable impurity elements in the titanium sponge. The raw materials are subjected to three times of vacuum consumable melting, so that the components are uniform and consistent, and no internal defects exist. The blank is subjected to a series of thermal processing and thermal treatment in the later period, and the performance of the blank meets the performance requirement of the ultrasonic scalpel. The method controls the components, hot working and heat treatment links step by step to prepare the titanium alloy bar with best matching strength, plasticity, toughness and fatigue performance, improves the ultra-high cycle fatigue of the ultrasonic scalpel, prolongs the service life, avoids the knife breaking phenomenon in the operation process, and has wide application prospect.

Description

TC4ELI titanium alloy for ultrasonic scalpel and production method of titanium alloy bar

Technical Field

The invention relates to the technical field of medical titanium alloy, in particular to a TC4ELI titanium alloy for an ultrasonic scalpel and a production method of a titanium alloy bar.

Background

At present, the operating principle of an ultrasonic scalpel is that an ultrasonic transducer converts electric energy provided by an ultrasonic generator into high-frequency mechanical vibration, the amplitude of the mechanical vibration is amplified by an ultrasonic horn, the amplified mechanical vibration is transmitted to a cutter bar connected with the horn and a head part, and finally, a tissue cutting function is realized by contacting biological tissues. The ultrasonic scalpel has the characteristics of low frequency, large amplitude and continuous work, and has the advantages of high precision, tidy operation incision, high hemostasis speed, small heat burn area, less smoke generation and the like. However, due to the long-term high-frequency vibration condition, the ultrasonic cutter may generate micro defects and gradually develop and expand in the service process, even break and stop vibrating, and the temperature can rise in a short time.

The material of the medical ultrasonic scalpel is generally selected to have particularly low loss and impedance in the working frequency range. At present, the most commonly used material of the ultrasonic scalpel is TC4 titanium alloy, the working frequency of the cutting hemostasis ultrasonic scalpel which is commonly used clinically is most 55Hz, the cutting hemostasis ultrasonic scalpel is in a high-frequency vibration working state of 5.5 multiplied by 104 times per second, the amplitude is about 55 mu m, the cycle frequency is high, the time is short, and metal fatigue is easy to occur to cause the fracture of a scalpel head.

Disclosure of Invention

The invention provides a TC4ELI titanium alloy for an ultrasonic scalpel and a production method of a titanium alloy bar, which solve the technical problem that the TC4 titanium alloy is broken in the operation process due to short fatigue life at present.

The invention provides a TC4ELI titanium alloy for an ultrasonic scalpel, which comprises, by weight, 5.5-6.5% of Al, 3.5-4.5% of V, 0.15-0.25% of Fe, and Si: 0.1 to 0.5 percent of titanium, 0.08 to 0.13 percent of O, 0 to 0.05 percent of C, 0 to 0.03 percent of N, 0 to 0.005 percent of H, and the balance of Ti and inevitable impurity elements in the titanium sponge. A small amount of Si element is added, so that the high-temperature performance and the creep resistance of the alloy can be improved; the sum of the contents of the components is 100 percent.

Further, the alloy comprises, by weight, 6.12% of Al, 4.01% of V, 0.17% of Fe, Si: 0.12%, O: 0.10%, C: 0.027%, N: 0.005%, H:0.0017 percent of titanium, and the balance of Ti and inevitable impurity elements in the sponge titanium; the sum of the contents of the components is 100 percent.

Further, the alloy comprises, by weight, 6.15% of Al, 4.05% of V, 0.18% of Fe, Si: 0.13%, O: 0.11%, C: 0.025%, N: 0.006%, H:0.0015 percent of titanium, and the balance of Ti and inevitable impurity elements in the sponge titanium; the sum of the contents of the components is 100 percent.

Further, the room temperature mechanical properties of the TC4ELI titanium alloy are as follows: the tensile strength Rm ranges from: 1050-1100 MPa; the yield strength rp0.2 ranges from: 950 to 1000 MPa; the range of elongation a is: 0 to 20 percent; the reduction of area Z ranges: 0-40%; the elastic modulus E ranges from: 105 to 110 GPa.

The invention provides a production method of a TC4ELI titanium alloy bar for an ultrasonic scalpel, which comprises the following steps:

smelting: weighing AL, V, Fe, Si, O, C, N, H and Ti according to the weight percentage, and mixing to obtain a mixture; and pressing an electrode on the mixture, and smelting into an ingot.

And forging, namely performing saw cutting and surface anti-oxidation coating treatment on the cast ingot, performing multi-fire reversing forging on the cast ingot above an alloy phase transition point and in an alpha + beta two-phase region respectively, and polishing surface defects in the middle to obtain a square billet.

Rough rolling: and carrying out surface grinding treatment on the square billet, carrying out heat preservation in an alpha + beta two-phase region, and carrying out large rolling deformation to obtain a wire rod, so that the structure of the alloy is finer and more uniform.

Finish rolling: and performing surface defect removal treatment on the wire rod, and performing finish rolling on the finished product at the temperature lower than the rough rolling temperature to ensure that the surface of the finished product does not generate large defects.

And (3) heat treatment: and pre-straightening and blanking the finish-rolled strips according to the length of finished products, annealing at 700-800 ℃ in an annealing furnace, and then carrying out stress-free straightening treatment.

And (3) finishing: and finishing the straightened straight rod to ensure that the size and the smoothness meet the requirements, and finally spraying codes and warehousing.

Further, in the smelting step, the titanium sponge is selected from zero-level small particle raw materials.

Furthermore, in the smelting step, three times of vacuum consumable smelting is adopted, so that the uniformity of components is ensured, and no internal defect exists.

Further, in the finishing step, the straight bar is finished by performing a small number of times of grinding processes on an automatic tandem grinding line.

Further, smelting: selecting aluminum-vanadium alloy, aluminum-silicon alloy and aluminum beans as raw materials, preparing cast ingots with the diameter of 620mm, peeling, detecting defects and sawing risers.

Forging: and repeatedly upsetting and forging the cast ingot from a beta single-phase region and an alpha + beta two-phase region by a press and a quick forging machine, repeatedly forging the cast ingot to a required square blank size, and grinding the cast ingot in the middle to remove surface defects.

Rough rolling: the surface of the square billet without defects is continuously rolled in an alpha + beta two-phase region, the square billet is directly and roughly rolled to a wire rod with phi of 10mm, and the surface defects are removed by peeling. Finish rolling, namely finish rolling the wire rod to phi 6.2mm at the temperature lower than the rough rolling temperature; the rolling speed is 3-5 m/s, and the dimensional tolerance is controlled within 0.03 mm.

And (3) heat treatment: the wire rod is straightened by a roller, cut to length and then annealed in a box furnace at the annealing temperature of 700 ℃ for 90min, the processing stress of the material is eliminated, and finally, the wire rod is straightened without stress, and the straightness is not more than 0.1 mm/m.

And (3) finishing: and grinding the straightened bar by a series-connected centerless grinder to obtain a straight finished product phi of 6.0mm, wherein the roughness Ra of the surface of the bar is not more than 0.4 mu m.

The invention provides a TC4ELI titanium alloy bar for an ultrasonic scalpel and a manufacturing method thereof, and the manufacturing method has the advantages that:

1) according to the invention, Si element is added into the conventional TC4ELI component, so that the room-temperature mechanical property, the high-temperature mechanical property and the high-temperature creep resistance of the alloy are improved.

2) The hot working process of the invention adopts multi-fire-time pier drawing, reverse forging and rolling with large deformation, so that the structure of the alloy is finer and more uniform, and the difference of the horizontal and longitudinal structures is reduced.

3) The heat treatment process of the invention adopts a process system combining annealing and stress relief straightening, and reduces the influence of residual stress on the fatigue strength of the alloy.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.

FIG. 1 is a cross-sectional view of a metallographic structure of a TC4ELI titanium alloy for an ultrasonic scalpel according to an embodiment of the present invention.

FIG. 2 is a longitudinal structural diagram of a metallographic structure of a TC4ELI titanium alloy for an ultrasonic scalpel according to an embodiment of the present invention.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

The embodiment of the invention provides a TC4ELI titanium alloy for an ultrasonic scalpel, which comprises, by weight, 5.5-6.5% of Al, 3.5-4.5% of V, 0.15-0.25% of Fe, and Si: 0.1-0.5%, 0.08-0.13% of O, 0-0.05% of C, 0-0.03% of N, 0-0.005% of H, and the balance of Ti and inevitable impurity elements in the titanium sponge; the sum of the contents of the components is 100 percent. And a small amount of Si element is added, so that the high-temperature performance and the creep resistance of the alloy can be improved.

Preferably, the alloy contains 6.12% of AL, 4.01% of V, 0.17% of Fe, and the weight ratio of Si: 0.12%, O: 0.10%, C: 0.027%, N: 0.005%, H:0.0017 percent of titanium, and the balance of Ti and inevitable impurity elements in the sponge titanium; the sum of the contents of the components is 100 percent.

Preferably, the alloy contains 6.15% of AL, 4.05% of V, 0.18% of Fe, 0.18% of Si: 0.13%, O: 0.11%, C: 0.025%, N: 0.006%, H:0.0015 percent of titanium, and the balance of Ti and inevitable impurity elements in the sponge titanium; the sum of the contents of the components is 100 percent.

Preferably, the room-temperature mechanical properties of the TC4ELI titanium alloy are as follows: the tensile strength Rm ranges from: 1050-1100 MPa; the yield strength rp0.2 ranges from: 950 to 1000 MPa; the range of elongation a is: 0 to 20 percent; the reduction of area Z ranges: 0-40%; the elastic modulus E ranges from: 105 to 110 GPa.

The embodiment of the invention provides a production method of a TC4ELI titanium alloy bar for an ultrasonic scalpel, which comprises the following steps:

smelting: weighing AL, V, Fe, Si, O, C, N, H and Ti according to the weight percentage, and mixing to obtain a mixture; pressing an electrode on the mixture, and smelting into an ingot; .

Rough rolling: and carrying out surface grinding treatment on the square billet, carrying out heat preservation in an alpha + beta two-phase region, and carrying out large rolling deformation to enable the structure of the alloy to be finer and more uniform.

Finish rolling: and performing surface defect removal treatment on the roughly rolled wire rod, and performing finish rolling on the finished product at a temperature lower than the rough rolling temperature to ensure that the surface of the finished product does not generate large defects.

Preferably, in the smelting step, the titanium sponge is selected from zero-level small-particle raw materials.

Preferably, in the smelting step, three times of vacuum consumable smelting are adopted, so that the uniformity of components is ensured, and no internal defect exists.

Preferably, in the finishing step, the straight bar is finished by performing a small number of times of grinding processes on an automatic tandem grinding line.

Preferably, smelting: selecting aluminum-vanadium alloy, aluminum-silicon alloy and aluminum beans as raw materials, preparing cast ingots with the diameter of 620mm, peeling, detecting defects and sawing risers.

Rough rolling: the surface of the square billet without defects is continuously rolled in an alpha + beta two-phase region, the square billet is directly and roughly rolled to a wire rod with phi of 10mm, and the surface defects are removed by peeling.

Finish rolling, namely finish rolling the wire rod to phi 6.2mm at the temperature lower than the rough rolling temperature; the rolling speed is 3-5 m/s, and the dimensional tolerance is controlled within 0.03 mm.

The following description is made in connection with a method for producing TC4ELI titanium alloy 6mm bars.

The TC4ELI titanium alloy phi 6mm bar provided by the embodiment of the invention has the following production method:

smelting: the method comprises the steps of selecting 0-grade small-particle sponge titanium, aluminum-vanadium alloy, aluminum-silicon alloy, aluminum beans and the like as raw materials, proportioning according to the weight proportion shown in tables 1 and 3, pressing electrodes, smelting in a vacuum consumable arc furnace for three times, preparing cast ingots with the diameter of 620mm, peeling, detecting defects and sawing risers. In the embodiment, zero-order small-particle sponge titanium is selected in the smelting process, electronic weighing and uniform material distribution can be adopted, a large-tonnage press is used for continuously pressing electrodes without welding and three times of vacuum consumable smelting, the component uniformity of the cast ingot is improved, and the generation of internal defects is reduced.

The chemical components of the ingot are shown in the table 1, and the components are uniform.

TABLE 1

The chemical composition of the ingot is shown in table 3, which is a comparative table of the chemical composition of the ingot with table 1, and the composition is uniform.

TABLE 3

In the finishing process of the embodiment, a mode of grinding by a plurality of grinding machines in series is adopted, and a small amount of grinding is carried out for a plurality of times, so that the smoothness of the surface of the material is improved, and the influence of surface defects on the fatigue strength is reduced.

The mechanical property detection of the finished product phi of 6.0mm corresponding to the table 1 is shown in the table 2, the transverse structure of the metallographic structure is shown in the figure 1, and the longitudinal structure of the metallographic structure is shown in the figure 2, so that the performance requirements of the medical ultrasonic scalpel are met, the ultrahigh cycle fatigue strength is improved, and the service life is prolonged.

As shown in Table 2

The mechanical property test of the finished product phi of 6.0mm corresponding to the table 3 is shown in the table 4, and compared with the table 2, the mechanical property test can not meet the performance requirements of the medical ultrasonic scalpel, can not improve the ultra-high cycle fatigue strength, and can not prolong the service life.

As shown in Table 4

In summary, the invention belongs to the technical field of medical titanium alloy bars, and provides a TC4ELI titanium alloy for an ultrasonic scalpel and a production method of the titanium alloy bar, which specifically comprises the following steps: the chemical components of the material are as follows: 5.5-6.5% of Al, 3.5-4.5% of V, 0.15-0.25% of Fe, Si: 0.1 to 0.5 percent of titanium, 0.08 to 0.13 percent of O, 0 to 0.05 percent of C, 0 to 0.03 percent of N, 0 to 0.005 percent of H, and the balance of Ti and inevitable impurity elements in the titanium sponge. The raw materials are subjected to three times of vacuum consumable melting, so that the components are uniform and consistent, and no internal defects exist. The blank is subjected to a series of thermal processing and thermal treatment in the later period, and the performance of the blank meets the performance requirement of the ultrasonic scalpel. The method controls the components, hot working and heat treatment links step by step to prepare the titanium alloy bar with best matching strength, plasticity, toughness and fatigue performance, improves the ultra-high cycle fatigue of the ultrasonic scalpel, prolongs the service life, avoids the knife breaking phenomenon in the operation process, and has wide application prospect.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. The TC4ELI titanium alloy for the ultrasonic scalpel is characterized by comprising, by weight, 5.5-6.5% of AL, 3.5-4.5% of V, 0.15-0.25% of Fe, and Si: 0.1-0.5%, 0.08-0.13% of O, 0-0.05% of C, 0-0.03% of N, 0-0.005% of H, and the balance of Ti and inevitable impurity elements in the titanium sponge; the sum of the contents of the components is 100 percent.

2. The TC4ELI titanium alloy for the ultrasonic surgical blade of claim 1, comprising, in weight percent, Al 6.12%, V4.01%, Fe 0.17%, Si: 0.12 percent of titanium, 0.10 percent of O, 0.027 percent of C, 0.005 percent of N, 0.0017 percent of H, and the balance of Ti and inevitable impurity elements in the titanium sponge; the sum of the contents of the components is 100 percent.

3. The TC4ELI titanium alloy for an ultrasonic surgical blade of claim 1, comprising, in weight percent, Al 6.15%, V4.05%, Fe 0.18%, Si: 0.13 percent of titanium, 0.11 percent of O, 0.025 percent of C, 0.006 percent of N, 0.0015 percent of H, and the balance of Ti and inevitable impurity elements in the sponge titanium; the sum of the contents of the components is 100 percent.

4. The TC4ELI titanium alloy for the ultrasonic surgical blade of any one of claims 1-3, wherein the TC4ELI titanium alloy has room temperature mechanical properties of: the tensile strength Rm ranges from: 1050-1100 MPa; the range of yield strength Rp is: 0.2: 950 to 1000 MPa; the range of elongation a is: 0 to 20 percent; reduction of area Z: the range of (A) is as follows: 0-40%; modulus of elasticity E: 105 to 110 GPa.

5. A method for preparing TC4ELI titanium alloy bar for an ultrasonic scalpel according to any one of claims 1-4, which comprises the following steps:

smelting: weighing AL, V, Fe, Si, O, C, N, H and Ti according to the weight percentage, and mixing to obtain a mixture; pressing an electrode on the mixture, and smelting into an ingot;

forging: the ingot is subjected to saw cutting and surface anti-oxidation coating treatment, multiple-fire reversing pier-drawing forging is respectively carried out above an alloy phase change point and in an alpha + beta two-phase region, and surface defects are polished in the middle to obtain a square billet;

rough rolling: carrying out surface grinding treatment on the square billet, carrying out heat preservation in an alpha + beta two-phase region, and carrying out large rolling deformation to obtain a wire rod, so that the structure of the alloy is finer and more uniform;

finish rolling: performing surface defect removal treatment on the wire rod, and performing finish rolling on a finished product at a temperature lower than the rough rolling temperature to ensure that the surface of the finished product does not generate large defects;

and (3) heat treatment: pre-straightening and blanking the finish-rolled strips according to the length of finished products, annealing at 700-800 ℃ in an annealing furnace, and then carrying out stress-free straightening treatment;

6. The method for producing the TC4ELI titanium alloy bar for the ultrasonic surgical knife as claimed in claim 5, wherein in the smelting step, the titanium sponge adopted by the ingredients is selected from zero-order small-particle raw materials.

7. The method for producing the TC4ELI titanium alloy bar for the ultrasonic surgical knife as claimed in claim 5, wherein in the smelting step, three times of vacuum consumable smelting are adopted to ensure uniform components and no internal defects.

8. The method of producing the TC4ELI titanium alloy bar for the ultrasonic surgical blade of claim 5, wherein in the finishing step, the straight bar is finished by a small number of times of grinding processes on an automatic in-line grinding line.

9. The method for producing the TC4ELI titanium alloy bar for the ultrasonic surgical knife according to any one of claims 6 to 8, wherein:

smelting: selecting aluminum-vanadium alloy, aluminum-silicon alloy and aluminum beans as raw materials, preparing a cast ingot with the diameter of phi 620mm, peeling, detecting a flaw and sawing a dead head;

forging: repeatedly upsetting, pulling and reversely forging the cast ingot from a beta single-phase region and an alpha + beta two-phase region respectively by a press and a quick forging machine, deforming to the required square blank size, and grinding the middle part to remove surface defects;

rough rolling: continuously rolling the square billet without the surface defect in an alpha + beta two-phase region, directly and roughly rolling the square billet to a wire rod with the diameter of phi 10mm, and peeling to remove the surface defect;

finish rolling, namely finish rolling the wire rod to phi 6.2mm at the temperature lower than the rough rolling temperature; the rolling speed is 3-5 m/s, and the dimensional tolerance is controlled within 0.03 mm;

and (3) heat treatment: straightening a wire rod by a roller, cutting the wire rod into sections by a fixed length, annealing in a box furnace at the annealing temperature of 700 ℃ for 90min to eliminate the processing stress of the material, and finally straightening without stress, wherein the straightness is not more than 0.1 mm/m;