A method for preparing a titanium alloy material for a high fatigue-resistant ultrasonic bone scalpel

Abstract

This invention provides a method for preparing a high-fatigue-resistant titanium alloy material for ultrasonic bone scalpels, comprising the following steps: 1. Performing high-temperature solution treatment on titanium alloy rods to obtain high-temperature solution-treated rods; 2. Performing non-isothermal cooling on the high-temperature solution-treated rods to obtain non-isothermal cooled rods; 3. Performing aging treatment on the non-isothermal cooled rods; 4. Performing hot stretching on the non-isothermal cooled rods during the aging treatment; 5. Water-cooling the aged and hot-stretched rods to room temperature and performing surface polishing to obtain the high-fatigue-resistant titanium alloy material for ultrasonic bone scalpels. This invention optimizes the grain morphology, size, and distribution in the alloy by precisely controlling the solution treatment, non-isothermal cooling, aging treatment, and hot stretching processes, significantly improving the fatigue performance of ultrasonic bone scalpel materials under high stress and high-frequency fatigue loads, enhancing their reliability and service life in medical devices. This method is simple and easy to implement, suitable for large-scale industrial production, and has broad application prospects.

Description

Technical Field

[0001] This invention belongs to the field of medical device materials technology, specifically relating to a method for preparing a titanium alloy material for a high fatigue-resistant ultrasonic bone scalpel. Background Technology

[0002] Ultrasonic bone scalpels are widely used in orthopedic surgery for cutting and trimming bone tissue, and their high efficiency and safety have made them an important surgical tool. TC4ELI titanium alloy, as an excellent biocompatible material, is widely used in medical devices due to its superior corrosion resistance, strength, and lightweight properties. However, ultrasonic bone scalpels are frequently subjected to complex mechanical loads (such as high-frequency vibration and repeated impacts) during use, leading to fatigue failure. Therefore, improving the fatigue resistance of TC4ELI titanium alloy is crucial for enhancing the service life and reliability of ultrasonic bone scalpels.

[0003] While current TC4ELI titanium alloy materials offer certain strength and corrosion resistance, their fatigue resistance remains insufficient, especially under repeated use conditions. Effective methods for controlling the material's microstructure and fatigue behavior are lacking. Therefore, optimizing the microstructure of TC4ELI titanium alloys to improve their fatigue resistance has become a pressing technical challenge. Summary of the Invention

[0004] The technical problem to be solved by this invention is to address the shortcomings of the prior art by providing a method for preparing a titanium alloy material with high fatigue resistance for ultrasonic bone scalpels. This method employs a combination of non-isothermal cooling and aging stretching, and for the first time proposes applying tensile stress during the aging process. This slight stretching promotes grain refinement and homogenization of the alloy, improves grain boundary properties, and thus significantly enhances the fatigue performance of TC4ELI titanium alloy, resulting in a titanium alloy material with high fatigue resistance for ultrasonic bone scalpels.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for preparing a titanium alloy material for a high fatigue-resistant ultrasonic bone scalpel, characterized in that the method includes the following steps:

[0006] Step 1: Heat the TC4ELI titanium alloy bar to 950℃~1050℃ and hold for 20min~40min to perform high-temperature solution treatment to obtain high-temperature solution-treated bar.

[0007] Step 2: The high-temperature solid solution rod obtained in Step 1 is rapidly cooled to 450℃~550℃ at a cooling rate of 50℃ / s~100℃ / s to obtain a non-isothermal cooled rod.

[0008] Step 3: Perform aging treatment on the non-isothermal cooled bar obtained in Step 2 at a temperature of 450℃~550℃ for 6h~12h.

[0009] Step 4: During the aging process in Step 3, when the non-isothermal cooled bar is heated to the target temperature for aging, a tensile stress of 300MPa~700MPa is applied to the non-isothermal cooled bar, and hot stretching is performed for 0.5h~2h. After the hot stretching is completed, the tensile stress is unloaded and the aging process continues to obtain the aged hot stretched bar.

[0010] Step 5: Cool the aged hot-stretched bar obtained in Step 4 to room temperature with water and perform surface polishing to obtain a high fatigue-resistant titanium alloy material for ultrasonic bone scalpels.

[0011] This invention utilizes high-temperature solution treatment to fully form the β phase in the bar stock. Precise control of temperature and time during the solution treatment process is crucial, as it helps obtain a fine, uniform β phase structure, laying the foundation for subsequent grain transformation and improved fatigue performance. Non-isothermal cooling within a specific temperature range achieves the alloy's microstructure transformation and controls the precipitation of the second phase, resulting in refined and uniformly distributed grains. Rapid cooling not only prevents the precipitation of coarse phases but also provides a better foundation for subsequent aging treatment. Aging treatment and hot stretching, with precise control of aging temperature and time, promote the uniform precipitation of fine α phase particles in the alloy, forming a fine equiaxed crystal structure with uniform grain distribution. Controlling tensile stress and time further refines the equiaxed crystals, resulting in a fine and uniform α and β equiaxed crystal structure. A certain number of small island-like β phases are distributed on the uniformly distributed equiaxed α phase matrix. Surface polishing removes the surface oxide layer and impurities, ensuring a smooth and clean surface.

[0012] The above-mentioned method for preparing a high-fatigue-resistant ultrasonic bone scalpel titanium alloy material is characterized in that the heating in step one is performed using an induction coil, and the non-isothermal cooling in step two is achieved by real-time monitoring of the temperature of the high-temperature solution-treated rod using a thermocouple, and dynamically controlling the power of the induction coil from 0.5kW to 3kW by adjusting the power supply current to rapidly cool to the target temperature. This invention, by using an induction coil for heating, ensures the heating effect while facilitating power adjustment and achieving non-isothermal cooling.

[0013] The above-mentioned method for preparing a high-fatigue-resistant ultrasonic bone scalpel titanium alloy material is characterized in that the tensile stress in step four is controlled by a stretching machine clamped at both ends of a non-isothermal-cooled rod. This invention uses a stretching machine to stretch both ends of the non-isothermal-cooled rod, ensuring the uniformity of the stretching.

[0014] The above-mentioned method for preparing a high fatigue-resistant ultrasonic bone scalpel titanium alloy material is characterized in that the microstructure of the high fatigue-resistant ultrasonic bone scalpel titanium alloy material in step five is a fine and uniform equiaxed crystal structure of α and β dual phases, with the β phase distributed on a uniformly distributed equiaxed α phase matrix, the volume fraction of the equiaxed α phase in the microstructure being between 50% and 60%, and the equiaxed crystal size being between 5 μm and 15 μm.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. This invention adopts a non-isothermal cooling combined with aging and stretching method, and proposes for the first time to apply tensile stress during the aging process. Through slight stretching, the alloy grains are refined and homogenized, and the grain boundary characteristics are improved, thereby significantly improving the fatigue performance of TC4ELI titanium alloy. The innovation of this process lies in utilizing the influence of tensile stress on the microstructure to control the grain morphology and grain boundary characteristics, which is a breakthrough of traditional heat treatment processes.

[0017] 2. This invention optimizes the equiaxed crystal morphology and size distribution of TC4ELI titanium alloy by precisely controlling the parameters of solution treatment, non-isothermal cooling and aging treatment. In particular, while controlling grain refinement, it ensures uniform grain distribution. Fine and uniform equiaxed crystals can significantly improve the fatigue life of the material, which has not yet been fully realized in existing heat treatment technologies.

[0018] 3. This invention utilizes a multi-stage heat treatment process, including solution treatment, non-isothermal cooling, aging treatment, and hot stretching control, to comprehensively regulate the microstructure of the alloy. In particular, under high-frequency fatigue loads, it can significantly improve the fatigue life of TC4ELI titanium alloy. Compared with existing traditional heat treatment processes, this invention has significant advantages in improving fatigue performance.

[0019] 4. By optimizing the equiaxed crystal morphology and size in the microstructure, this invention significantly improves the fatigue life of TC4ELI titanium alloy under high stress and high frequency fatigue load. Compared with untreated bars, the fatigue strength and fatigue life of the alloy are increased by 20% to 40%.

[0020] 5. The heat treatment process of the present invention is easy to promote and apply in industrial production and has strong adaptability. By adjusting the parameters in the heat treatment process, the alloy properties can be optimized according to different application requirements.

[0021] 6. This invention provides a heat treatment process that significantly improves the fatigue performance of TC4ELI titanium alloy by controlling the morphology, size and distribution of isometric crystals. By optimizing multiple key parameters in the heat treatment process, precise control of the alloy microstructure is achieved, thereby improving fatigue life.

[0022] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0023] Figure 1 This is a schematic diagram showing the connection relationship between the induction coil, the non-isothermal cooled bar, and the stretching machine fixture during the hot stretching process in the aging treatment of this invention.

[0024] Figure 2 The image shows the metallographic structure of the TC4ELI titanium alloy bar used in Example 1 of this invention.

[0025] Figure 3 The image shows the metallographic structure of the titanium alloy material for high fatigue resistance ultrasonic bone scalpel obtained in Example 1 of this invention.

[0026] Figure 4 The admittance circle of the titanium alloy ultrasonic bone scalpel prepared in Example 1 of this invention during ultrasonic vibration.

[0027] Figure 5 The admittance curve of the titanium alloy ultrasonic bone scalpel prepared in Example 1 of the present invention during ultrasonic vibration.

[0028] Figure 6 This is a schematic diagram of the structure of a titanium alloy ultrasonic bone scalpel prepared using the high fatigue resistance ultrasonic bone scalpel material obtained in Example 1 of the present invention after ultrasonic vibration.

[0029] Figure 7 This is a metallographic diagram of the heat-treated titanium alloy obtained in Comparative Example 1 of the present invention.

[0030] Figure 8 The admittance circle of the titanium alloy ultrasonic bone scalpel prepared in Comparative Example 1 of this invention during ultrasonic vibration.

[0031] Figure 9 The admittance curve of the titanium alloy ultrasonic bone scalpel prepared in Comparative Example 1 of this invention during ultrasonic vibration.

[0032] Figure 10 This is a schematic diagram of the structure of a titanium alloy ultrasonic bone scalpel prepared by heat treatment of titanium alloy obtained by Comparative Example 1 of the present invention after ultrasonic vibration.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1—Induction coil; 2—Non-isothermal cooled bar; 3—Stretching machine fixture. Detailed Implementation

[0035] Figure 1 This is a schematic diagram of the structure of the induction coil, the non-isothermal cooled bar, and the stretching machine fixture during the hot stretching process in the aging treatment of this invention. Figure 1As can be seen, the induction coil 1 used for induction heating is wrapped around the outside of the non-isothermal cooled bar 2 to heat the non-isothermal cooled bar 2, and the stretching machine clamp 3 clamps the two ends of the non-isothermal cooled bar 2 to achieve hot stretching during the aging process.

[0036] Example 1

[0037] This embodiment includes the following steps:

[0038] Step 1: Heat the TC4ELI titanium alloy bar to 960℃ using an induction coil and hold for 30 minutes to perform high-temperature solution treatment, thereby obtaining a high-temperature solution-treated bar.

[0039] Step 2: The high-temperature solid solution rod obtained in Step 1 is subjected to real-time temperature monitoring via thermocouples. The power of the induction coil is dynamically controlled to 3kW by adjusting the power supply current. The rod is rapidly cooled to 550℃ at a cooling rate of 50℃ / s to obtain a non-isothermal cooled rod.

[0040] Step 3: Aging treatment is performed on the non-isothermal cooled bar material obtained in Step 2 at a temperature of 550℃ for 6 hours.

[0041] Step 4: During the aging process in Step 3, when the non-isothermal cooled bar is heated to the target temperature for aging, a tensile stress of 500 MPa is applied to the non-isothermal cooled bar by a stretching machine clamped at both ends of the non-isothermal cooled bar, and hot stretching is performed for 1.5 hours. After the hot stretching is completed, the tensile stress is unloaded and the aging process continues to obtain the aged hot-stretched bar.

[0042] Step 5: Cool the aged hot-stretched bar obtained in Step 4 to room temperature with water and perform surface polishing to obtain a high fatigue-resistant titanium alloy material for ultrasonic bone scalpels.

[0043] Step 6: The high fatigue-resistant ultrasonic bone scalpel obtained in Step 5 is machined using titanium alloy material to obtain the high fatigue-resistant ultrasonic bone scalpel.

[0044] Figure 2 This is a metallographic image of the TC4ELI titanium alloy bar used in this embodiment. Figure 2 As can be seen from the data, 80%-90% of the TC4ELI titanium alloy rods used in this embodiment are α phase, and the remainder are small-sized β phase.

[0045] Figure 3 The image shows the metallographic structure of the high fatigue resistance ultrasonic bone scalpel titanium alloy material obtained in this embodiment. Figure 3As can be seen from the figure, the microstructure of the high fatigue-resistant ultrasonic bone scalpel titanium alloy material obtained in this embodiment is a fine and uniform equiaxed α and β crystal structure. A certain number of small island-shaped β phases are distributed on the uniformly distributed equiaxed α phase matrix. The volume fraction of equiaxed α phase in the microstructure is greater than 50%. The equiaxed crystal size of the rod is 5μm~10μm, and the metallographic structure is uniform.

[0046] The titanium alloy ultrasonic bone scalpel prepared in this embodiment was tested for vibration frequency using an ultrasonic vibrator and transducer. The test was repeated five times, with each test lasting 10 minutes. Fatigue performance, admittance circle, and admittance curve were obtained to verify its performance. The results are shown in [Figure number missing]. Figure 4 and Figure 5 , Figure 4 The horizontal axis represents conductance G, and the vertical axis represents susceptance B. This is used to analyze the admittance characteristics of a circuit. The curve, the admittance circle, represents the trajectory of admittance as a function of frequency in a polar coordinate system. Figure 5 In the diagram, the red line represents the logarithmic impedance amplitude, and the blue line represents the impedance phase angle. The horizontal axis represents the frequency in Hz (logarithmic scale), and the vertical axis represents the impedance phase angle in ° when the curve is red. Figure 4 and Figure 5 As can be seen from the results, the titanium alloy ultrasonic bone scalpel prepared in this embodiment was tested by an ultrasonic vibrator and transducer. The vibration frequency was within the target range, the fatigue performance was good, no fracture occurred, and the admittance circle and admittance curve remained normal.

[0047] Figure 6 This is a schematic diagram of the structure of a titanium alloy ultrasonic bone scalpel prepared using the high fatigue resistance titanium alloy material obtained in this embodiment after ultrasonic vibration. Figure 6 As can be seen from the above, the titanium alloy ultrasonic bone scalpel prepared from titanium alloy material with high fatigue resistance obtained in this embodiment has a complete structure after ultrasonic vibration.

[0048] Comparative Example 1

[0049] This comparative example includes the following steps:

[0050] Step 1: Heat the TC4ELI titanium alloy bar to 960℃ and hold for 30 minutes to perform high-temperature solution treatment to obtain a high-temperature solution-treated bar.

[0051] Step 2: Cool the high-temperature solution-treated rod obtained in Step 1 to room temperature with water;

[0052] Step 3: The high-temperature solution-treated bar stock that was water-cooled to room temperature in Step 2 is then water-cooled to room temperature and aged at a temperature of 550℃ for 6 hours.

[0053] Step 4: Cool the rod material after aging treatment in Step 3 to room temperature with water and perform surface polishing to obtain titanium alloy material for ultrasonic bone scalpel.

[0054] Step 5: The ultrasonic bone scalpel obtained in Step 4 is machined using titanium alloy material to obtain the ultrasonic bone scalpel.

[0055] Figure 7 The image shows the metallographic structure of the heat-treated titanium alloy obtained in this comparative example. Figure 7 As can be seen from the comparison example, after this heat treatment, the titanium alloy has a mixed α+β dual-state structure. The alloy structure consists of equiaxed α phase and lamellar α phase, and also contains transformed β structure.

[0056] The titanium alloy ultrasonic bone scalpel prepared in this comparative example was tested for vibration frequency using an ultrasonic vibrator and transducer. The test was repeated twice, with each test lasting 10 minutes. Fatigue performance, admittance circle, and admittance curve were obtained to verify its performance. The results are shown in [Figure number missing]. Figure 8 and Figure 9 , Figure 8 The horizontal axis represents conductance G, and the vertical axis represents susceptance B. This is used to analyze the admittance characteristics of a circuit. The curve, the admittance circle, represents the trajectory of admittance as a function of frequency in a polar coordinate system. Figure 9 In the diagram, the red line represents the logarithmic impedance amplitude, and the blue line represents the impedance phase curve. The horizontal axis represents the frequency in Hz (logarithmic scale), and the vertical axis represents the logarithmic impedance amplitude (dB) when the curve is red and the impedance phase angle (°) when the curve is blue. Figure 8 and Figure 9 As can be seen, the admittance circle and admittance curve showed abnormalities and fractures after one vibration cut.

[0057] Figure 10 This is a schematic diagram of the structure of a titanium alloy ultrasonic bone scalpel prepared using the heat-treated titanium alloy obtained in this comparative example after ultrasonic vibration. Figure 10 As can be seen from the comparison, the titanium alloy ultrasonic bone scalpel prepared from the heat-treated titanium alloy obtained in this comparative example fractured after ultrasonic vibration.

[0058] A comparison between Example 1 and Comparative Example 1 shows that Comparative Example 1, which did not undergo non-isothermal cooling or aging treatment under hot tensile conditions, fractured after two ultrasonic vibration tests. Example 1, which underwent non-isothermal cooling and aging treatment under hot tensile conditions, maintained structural integrity after five ultrasonic vibration tests. This demonstrates that non-isothermal cooling and aging treatment under hot tensile conditions significantly improve the fatigue resistance of the titanium alloy material used in ultrasonic bone cutters.

[0059] Example 2

[0060] This embodiment includes the following steps:

[0061] Step 1: Heat the TC4ELI titanium alloy bar to 950℃ using an induction coil and hold for 40 minutes to perform high-temperature solution treatment, thereby obtaining a high-temperature solution-treated bar.

[0062] Step 2: The high-temperature solid solution rod obtained in Step 1 is subjected to real-time temperature monitoring via thermocouples. The power of the induction coil is dynamically controlled to 2kW by adjusting the power supply current. The rod is rapidly cooled to 500℃ at a cooling rate of 70℃ / s to obtain a non-isothermal cooled rod.

[0063] Step 3: Aging treatment is performed on the non-isothermal cooled bar material obtained in Step 2 at a temperature of 500℃ for 12 hours.

[0064] Step 4: During the aging process in Step 3, when the non-isothermal cooled bar is heated to the target temperature for aging, a tensile stress of 300 MPa is applied to the non-isothermal cooled bar by a stretching machine clamped at both ends of the non-isothermal cooled bar, and hot stretching is performed for 2 hours. After the hot stretching is completed, the tensile stress is unloaded and the aging process continues to obtain the aged hot-stretched bar.

[0065] Step 5: Cool the aged hot-stretched bar obtained in Step 4 to room temperature with water and perform surface polishing to obtain a high fatigue-resistant titanium alloy material for ultrasonic bone scalpels.

[0066] Step 6: The high fatigue-resistant ultrasonic bone scalpel obtained in Step 5 is machined using titanium alloy material to obtain the high fatigue-resistant ultrasonic bone scalpel.

[0067] Example 3

[0068] This embodiment includes the following steps:

[0069] Step 1: Heat the TC4ELI titanium alloy bar to 1050℃ using an induction coil and hold for 20 minutes to perform high-temperature solution treatment, thereby obtaining a high-temperature solution-treated bar.

[0070] Step 2: The high-temperature solid solution rod obtained in Step 1 is subjected to real-time temperature monitoring via thermocouples. The power of the induction coil is dynamically controlled to 0.5kW by adjusting the power supply current. The rod is rapidly cooled to 450℃ at a cooling rate of 100℃ / s to obtain a non-isothermal cooled rod.

[0071] Step 3: Aging treatment is performed on the non-isothermal cooled bar material obtained in Step 2 at a temperature of 450℃ for 10 hours.

[0072] Step 4: During the aging process in Step 3, when the non-isothermal cooled bar is heated to the target temperature for aging, a tensile stress of 700 MPa is applied to the non-isothermal cooled bar by a stretching machine clamped at both ends of the non-isothermal cooled bar, and hot stretching is performed for 0.5 hours. After the hot stretching is completed, the tensile stress is unloaded and the aging process continues to obtain the aged hot-stretched bar.

[0073] Step 5: Cool the aged hot-stretched bar obtained in Step 4 to room temperature with water and perform surface polishing to obtain a high fatigue-resistant titanium alloy material for ultrasonic bone scalpels.

[0074] Step 6: The high fatigue-resistant ultrasonic bone scalpel obtained in Step 5 is machined using titanium alloy material to obtain the high fatigue-resistant ultrasonic bone scalpel.

[0075] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Any simple modifications, alterations, and equivalent changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for manufacturing a titanium alloy material for a high fatigue resistance ultrasonic osteotome, characterized by, The method comprises the following steps: Step one, heat the TC4ELI titanium alloy rod to 950-1050℃ and keep for 20-40min, carry out high temperature solid solution treatment, and obtain high temperature solid solution rod; Step two, quickly cool the high temperature solid solution rod obtained in step one to 450-550℃ at a cooling rate of 50-100℃ / s, carry out non-isothermal cooling, and obtain non-isothermal cooling rod; Step three, carry out aging treatment on the non-isothermal cooling rod obtained in step two, the temperature is 450-550℃, and the time is 6-12h; Step four, during the aging treatment in step three, when the non-isothermal cooling rod is heated to the target temperature of the aging treatment, apply a tensile stress of 300-700MPa to the non-isothermal cooling rod, carry out hot stretching for 0.5-2h, unload the tensile stress after the hot stretching is completed, and continue the aging treatment, and obtain aging hot stretched rod; Step five, water cool the aging hot stretched rod obtained in step four to room temperature and carry out surface polishing treatment, and obtain titanium alloy material for high fatigue resistance ultrasonic bone knife; the titanium alloy material for high fatigue resistance ultrasonic bone knife has fine and uniform α and β dual-phase equiaxed crystal structure, the β phase is distributed on the matrix of uniformly distributed equiaxed α phase, the volume fraction of equiaxed α phase in the structure is between 50% and 60%, and the equiaxed crystal size is 5-15μm.

2. The method for preparing a high-fatigue-resistant titanium alloy material for ultrasonic bone scalpels according to claim 1, characterized in that, The heating in step one is carried out by using an induction coil, and the non-isothermal cooling in step two is to monitor the temperature of the high temperature solid solution rod in real time by using a thermocouple, adjust the power of the induction coil to 0.5-3kW by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power of the induction coil by adjusting the power 3. The method for preparing a high-fatigue-resistant titanium alloy material for ultrasonic bone scalpels according to claim 1, characterized in that, ​

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