A wear-resistant strengthening process for lightweight titanium alloy gears

Abstract

The present invention provides a wear-resistant strengthening process for a lightweight titanium alloy gear, belonging to the technical field of titanium alloy gears, and comprising the following steps: (1) preparing a titanium alloy bar, wherein the titanium alloy bar comprises the following components in percentage by weight: Al 4.5% - 5.8%, Cr 3.2% - 4.7%, Mo 1.4% - 2.7%, Zr 1.8% - 2.6%, V 2.3% - 3.9%, Si 0.11% - 0.19%, La 1.8% - 2.7%, Fe 0.12 - 0.25%, and the balance is Ti and unavoidable impurities; (2) rough-machining the titanium alloy bar into a gear blank; (3) performing hot isostatic pressing treatment on the gear blank, and then cladding a hardening layer on the surface of the gear blank body; (4) machining the titanium alloy gear with the hardening layer to the designed dimensions to obtain a titanium alloy gear. The titanium alloy gear prepared by the present invention has excellent wear resistance, corrosion resistance, contact fatigue performance, and good temperature resistance.

Description

Technical Field

[0001] The present invention belongs to the technical field of titanium alloy gears, and particularly relates to a wear-resistant strengthening process for lightweight titanium alloy gears. Background Art

[0002] Gears have always been important basic components in the machinery industry due to their advantages such as a large power transmission range, high transmission efficiency, accurate transmission ratio, long service life, and reliable operation. Titanium alloy gears are a special type of gear made from titanium and its alloy materials, and their design and manufacture are aimed at meeting the requirements of specific applications, especially in environments that require lightweight, high strength, corrosion resistance, and high temperature resistance.

[0003] However, in the face of some special working conditions, most titanium alloys cannot meet the increasingly high usage requirements. For example, the gears used in helicopter transmission systems are subjected to alternating loads and severe impact loads, and their working conditions include various alternating stresses, impact dynamic stresses, as well as wear and corrosion. Although titanium alloys have good fatigue strength, there is still a risk of early failure under high load cycles. Moreover, with the progress of design, the increase in transmitted energy and speed, the temperature on the gear meshing surface is also continuously rising, and the gear meshing surface temperature can reach up to 300°C. Currently, the fatigue resistance of titanium alloy gears at high temperatures on the market cannot meet the requirements of the market.

[0004] Therefore, there is an urgent need for a wear-resistant strengthening process for lightweight titanium alloy gears. Summary of the Invention

[0005] The purpose of the present invention is to provide a wear-resistant strengthening process for lightweight titanium alloy gears.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A wear-resistant strengthening process for lightweight titanium alloy gears, comprising the following steps:

[0008] (1) Prepare titanium alloy bars, including the following steps:

[0009] Step 1: The titanium alloy bars include the following components by weight percentage: Al 4.5% - 5.8%, Cr 3.2% - 4.7%, Mo 1.4% - 2.7%, Zr 1.8% - 2.6%, V 2.3% - 3.9%, Si 0.11% - 0.19%, La 1.8% - 2.7%, Fe 0.12 - 0.25%, and the rest is Ti and inevitable impurities; after mixing the components of the titanium alloy bars evenly, press them to obtain electrode blocks;

[0010] Step 2: Melt the electrode blocks in a vacuum consumable furnace to obtain titanium alloy billets;

[0011] Step 3: Forge the titanium alloy blank at 1000°C - 1150°C, and then place it in a precision forging machine to forge it at 900°C - 980°C to obtain the forged titanium alloy bar;

[0012] Step 4: Subject the forged titanium alloy bar to crystallization and annealing in sequence to obtain a semi-finished titanium alloy bar;

[0013] Step 5: Subject the semi-finished titanium alloy bar to solution treatment and aging treatment in sequence, and then air-cool it to room temperature to obtain the titanium alloy bar;

[0014] (2) Rough machine the titanium alloy bar into a gear blank;

[0015] (3) Subject the gear blank to hot isostatic pressing treatment. Mix TiC powder, Ti powder and Ni powder in a ratio of 1:(1.4 - 1.7):(0.2 - 0.6). At a power of 2200 - 2300 W and a scanning speed of 3.0 - 3.3 mm / s, a hardened layer with a thickness of 2 - 4 μm is formed by cladding on the surface of the gear blank to obtain a titanium alloy gear with a hardened layer;

[0016] (4) Machine the titanium alloy gear with a hardened layer to the designed dimensions to obtain the titanium alloy gear.

[0017] Further, the weight percentage of Al is less than the sum of the weight percentages of Cr and Mo.

[0018] Through the use of a titanium alloy bar with specific components and a titanium alloy gear prepared by synergistic action with a hardened layer, the present invention finds that when the weight percentage of Al is less than the sum of the weight percentages of Cr and Mo, the contact fatigue resistance of the titanium alloy gear at room temperature can be improved under this condition. Elements such as Al, Cr, and Mo can form different phase structures in the titanium matrix. Al usually promotes the formation of the α phase (hexagonal close-packed structure), while Cr and Mo tend to increase the stability of the β phase (body-centered cubic structure). Controlling the ratio of these two phases helps to optimize the room temperature fatigue resistance of the material; however, the contact fatigue performance of the titanium alloy gear under this condition is not ideal.

[0019] Further, the weight ratio of Al, Cr, and Zr is (5.0 - 5.4):(3.2 - 3.8):(2.0 - 2.5).

[0020] In a gear transmission system, due to the need to withstand high stresses, the contact fatigue performance is a very important indicator. Contact fatigue refers to the phenomenon where cracks appear and gradually expand on the surface or near the surface of a material under the action of repeated stresses, ultimately leading to material failure. Through a large number of experiments, it has been found that in the present invention, when Al, Cr, and Zr are in specific proportion conditions, the contact fatigue performance of titanium alloy gears at high temperatures can be improved. The analysis is that Al is an α-phase stabilizing element, which can promote the formation of the α-phase. An appropriate amount of Al can enhance the hardness and strength of the titanium alloy, but an excessive amount will lead to an increase in brittleness; Cr and Zr are also α-phase stabilizing elements. They can refine the grains, improve the toughness of the material, and at the same time enhance the oxidation resistance and corrosion resistance of the material. Al, Cr, and Zr can all improve the strength of the titanium alloy through the solid solution strengthening mechanism. They can form fine and dispersed strengthening phases, such as TiAl, TiCr, and TiZr compounds. These compounds are distributed in the matrix, increasing the deformation resistance of the material at high temperatures. When the proportions of Al, Cr, and Zr are appropriate, the interfacial characteristics in the α / β two-phase region can be optimized, reducing interfacial defects, thereby improving the fatigue life of the material.

[0021] Further, the titanium alloy bar comprises the following components in weight percentages: Al 5.2%, Cr 3.3%, Mo 2.4%, Zr 2.4%, V 3.1%, Si 0.15%, La 2.4%, Fe 0.18%, and the balance is Ti and unavoidable impurities.

[0022] Further, the process of melting is as follows: Put the electrode block into the vacuum consumable furnace for melting, heat it up to 1650°C - 1670°C at a heating power of 12 kW / min - 14 kW / min, hold for 20 min - 25 min, and then obtain the titanium alloy blank after natural cooling for 2 - 3 h.

[0023] Further, the method of crystallization is: Heat to 950°C - 980°C and then hold for 5 h - 7 h.

[0024] Further, the method of annealing is: Heat to 600°C - 620°C and then hold for 5 h - 7 h.

[0025] In the present invention, by sequentially performing high-temperature crystallization and low-temperature annealing treatments on the forged titanium alloy bar, this series of heat treatment processes can improve the hardness of the titanium alloy. High-temperature crystallization can promote the uniform distribution of alloying elements throughout the matrix, eliminating the phenomenon of composition segregation that may occur during the casting or forging process. In the low-temperature annealing stage, second-phase particles (such as TiAl, TiCr, etc.) precipitated from the solid solution will form inside the material. These fine and uniformly distributed particles can play a strengthening role and improve the hardness of the material.

[0026] Further, the solution treatment method is: heat preservation for 30 min - 60 min under the condition of 750°C - 780°C.

[0027] Further, the aging treatment method is: after solution treatment, naturally cool in the furnace to 520°C - 560°C and heat preservation for 4 h - 6 h.

[0028] Further, the conditions of hot isostatic pressing are: the maximum pressure is 180 - 200 MPa, the pressure increasing rate is 20 - 30 MPa / min, and the pressure holding time is 2 - 4 min.

[0029] Further, the preparation of the titanium alloy bar also includes the following steps: sequentially perform solution treatment and aging treatment on the semi-finished titanium alloy bar, then air-cool to room temperature, and spray a TiN coating with a thickness of 5 - 20 μm on the surface by laser.

[0030] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0031] 1. The titanium alloy gear prepared by the present invention through the synergistic effect of using a titanium alloy bar with specific components and a hardened layer has excellent wear resistance and good contact fatigue resistance.

[0032] 2. The present invention adjusts the alloy composition. When the weight percentage of Al is less than the sum of the weight percentages of Cr and Mo, the fatigue resistance of the titanium alloy gear at room temperature can be improved under this condition.

[0033] 3. When Al, Cr, and Zr are in specific ratio conditions, the present invention can improve the contact fatigue performance of the titanium alloy gear at high temperature.

[0034] 4. The present invention improves the hardness of the titanium alloy by sequentially performing high-temperature crystallization and low-temperature annealing treatments on the forged titanium alloy bar. Specific Embodiments

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0036] Example 1

[0037] This example provides a wear-resistant strengthening process for a lightened titanium alloy gear, including the following steps:

[0038] (1) Prepare a titanium alloy bar, including the following steps:

[0039] Step 1. The titanium alloy bar comprises the following components in weight percentage: Al 5.2%, Cr 3.3%, Mo 2.4%, Zr 2.4%, V 3.1%, Si 0.15%, La 2.4%, Fe 0.18%, and the balance is Ti and unavoidable impurities; the components of the titanium alloy bar are mixed evenly and then pressed to obtain an electrode block;

[0040] Step 2. The electrode block is melted in a vacuum consumable furnace. The electrode block is placed in the vacuum consumable furnace and heated to 1660 °C at a heating power of 13 kW / min, held for 22 min, and then naturally cooled for 2.5 h to obtain a titanium alloy blank;

[0041] Step 3. The titanium alloy blank is forged at 1080 °C for 2 min, and then placed in a precision forging machine and forged at 920 °C for 5 min to obtain a forged titanium alloy bar;

[0042] Step 4. The forged titanium alloy bar is subjected to high-temperature crystallization in sequence: heated to 960 °C and held for 6 h; then low-temperature annealing: heated to 610 °C and held for 6 h to obtain a semi-finished titanium alloy bar;

[0043] Step 5. The semi-finished titanium alloy bar is first solution-treated under the conditions of: held at 770 °C for 40 min; then naturally cooled in the furnace to 540 °C and held for 5 h for aging treatment, and then air-cooled to room temperature to obtain a titanium alloy bar;

[0044] (2) The titanium alloy bar is rough-machined into a gear blank;

[0045] (3) The gear blank is subjected to hot isostatic pressing treatment, with a pressure increase rate of 25 MPa / min, a maximum pressure of 190 MPa, and a holding time of 3 min at the maximum pressure. Mix TiC powder, Ti powder, and Ni powder with a weight ratio of 1:1.5:0.4, and at a power of 2250 W and a scanning speed of 3.2 mm / s, a 3-μm-thick hardened layer is formed by cladding on the surface of the gear blank to obtain a titanium alloy gear with a hardened layer; the particle size of the TiC powder is 200-300 nm, purchased from Zhongkeyannuo (Beijing) Technology Co., Ltd. with the product number: BM11316; the particle size of the Ti powder is 400-500 nm, purchased from Zhongkeyannuo (Beijing) Technology Co., Ltd.; the particle size of the Ni powder is 700-800 nm, purchased from Zhongkeyannuo (Beijing) Technology Co., Ltd.

[0046] (4) The titanium alloy gear with a hardened layer is machined to the designed dimensions to obtain a titanium alloy gear.

[0047] Example 2

[0048] This example provides a wear-resistant strengthening process for lightweight titanium alloy gears, including the following steps:

[0049] (1) Prepare titanium alloy bars, including the following steps:

[0050] Step 1: The titanium alloy bars include the following components by weight percentage: Al 5.0%, Cr 3.2%, Mo 2.7%, Zr 2.0%, V 2.3%, Si 0.11%, La 1.8%, Fe 0.12%, and the rest are Ti and unavoidable impurities; after mixing the components of the titanium alloy bars evenly, press them to obtain electrode blocks;

[0051] Step 2: Melt the electrode blocks in a vacuum consumable furnace. Put the electrode blocks into the vacuum consumable furnace, heat them up to 1650 °C at a heating power of 12 kW / min, keep them warm for 20 min, and then cool them naturally for 2 h to obtain titanium alloy billets;

[0052] Step 3: Forge the titanium alloy billets at 1000 °C for 2 min, and then place them in a precision forging machine and forge them at 900 °C for 5 min to obtain forged titanium alloy bars;

[0053] Step 4: Subject the forged titanium alloy bars to high-temperature crystallization in sequence: heat them to 950 °C and keep them warm for 5 h; then perform low-temperature annealing: heat them to 600 °C and keep them warm for 5 h to obtain semi-finished titanium alloy bars;

[0054] Step 5: First, perform solution treatment on the semi-finished titanium alloy bars. The conditions for the solution treatment are: keep them warm at 750 °C for 30 min; then cool them naturally in the furnace to 520 °C and keep them warm for 4 h for aging treatment, and then air-cool them to room temperature to obtain titanium alloy bars;

[0055] (2) Rough-process the titanium alloy bars into gear blanks;

[0056] (3) Perform hot isostatic pressing on the gear blanks. The pressure increasing rate is 20 MPa / min, the maximum pressure is 180 MPa, and the holding time under the maximum pressure is 2 min. Mix TiC powder, Ti powder, and Ni powder with a weight ratio of 1:1.4:0.2, and at a power of 2200 W and a scanning speed of 3.0 mm / s, melt and deposit a 3-μm-thick hardened layer on the surface of the gear blank to obtain a titanium alloy gear with a hardened layer; the particle size of the TiC powder is 200 - 300 nm, purchased from Zhongke Yannuo (Beijing) Technology Co., Ltd. in [year], product number: BM11316; the particle size of the Ti powder is 400 - 500 nm, purchased from Zhongke Yannuo (Beijing) Technology Co., Ltd. in [year]; the particle size of the Ni powder is 700 - 800 nm, purchased from Zhongke Yannuo (Beijing) Technology Co., Ltd. in [year].

[0057] (4) Machine the titanium alloy gear with a hardened layer to the designed dimensions to obtain a titanium alloy gear.

[0058] Example 3

[0059] This example provides a wear-resistant strengthening process for lightweight titanium alloy gears, including the following steps:

[0060] (1) Prepare titanium alloy bars, including the following steps:

[0061] Step 1: The titanium alloy bar includes the following components by weight percentage: Al 5.4%, Cr 3.8%, Mo 1.9%, Zr 2.5%, V 3.9%, Si 0.19%, La 2.7%, Fe 0.25%, and the rest are Ti and inevitable impurities; after mixing the components of the titanium alloy bar evenly, press them to obtain an electrode block;

[0062] Step 2: Melt the electrode block in a vacuum consumable furnace. Put the electrode block into the vacuum consumable furnace, heat it up to 1670 °C at a heating power of 14 kW / min, keep it warm for 25 min, and naturally cool it for 3 h to obtain a titanium alloy blank;

[0063] Step 3: Forge the titanium alloy blank at 1150 °C for 2 min, then place it in a precision forging machine and forge it at 980 °C for 5 min to obtain the forged titanium alloy bar;

[0064] Step 4: Subject the forged titanium alloy bar to high-temperature crystallization in sequence: heat it to 980 °C and keep it warm for 7 h; then perform low-temperature annealing: heat it to 620 °C and keep it warm for 7 h to obtain a semi-finished titanium alloy bar;

[0065] Step 5: First, perform solution treatment on the semi-finished titanium alloy bar. The conditions for solution treatment are: keep it warm at 780 °C for 60 min; then naturally cool it in the furnace to 560 °C and keep it warm for 6 h for aging treatment, and then air-cool it to room temperature to obtain a titanium alloy bar;

[0066] (2) Rough machine the titanium alloy bar into a gear blank;

[0067] (3) Perform hot isostatic pressing on the gear blank. The pressure increase rate is 30 MPa / min, the maximum pressure is 200 MPa, and the holding time under the maximum pressure is 4 min. Mix TiC powder, Ti powder, and Ni powder with a weight ratio of 1:1.7:0.6, and at a power of 2300 W and a scanning speed of 3.3 mm / s, melt and coat a 3-μm-thick hardened layer on the surface of the gear blank to obtain a titanium alloy gear with a hardened layer; the particle size of TiC powder is 200 - 300 nm, purchased from Zhongkeyannuo (Beijing) Technology Co., Ltd. in the current year, product number: BM11316; the particle size of Ti powder is 400 - 500 nm, purchased from Zhongkeyannuo (Beijing) Technology Co., Ltd. in the current year; the particle size of Ni powder is 700 - 800 nm, purchased from Zhongkeyannuo (Beijing) Technology Co., Ltd. in the current year.

[0068] (4) Process the titanium alloy gear with a hardened layer to the designed dimensions to obtain a titanium alloy gear.

[0069] Comparative Example 1

[0070] The difference between this comparative example and Example 1 is that the titanium alloy bar includes the following components in weight percentages: Al 4.0%, Cr 3.0%, Mo 3.4%, Zr 2.9%, V 2.1%, Si 0.25%, La 3.4%, Fe 0.08%, and the balance is Ti and unavoidable impurities.

[0071] Comparative Example 2

[0072] The difference between this comparative example and Example 1 is that the titanium alloy bar includes the following components in weight percentages: Al 5.8%, Cr 3.2%, Mo 1.4%, Zr 2.4%, V 3.1%, Si 0.15%, La 2.4%, Fe 0.18%, and the balance is Ti and unavoidable impurities.

[0073] Comparative Example 3

[0074] The difference between this comparative example and Example 1 is that the titanium alloy bar includes the following components in weight percentages: Al 4.5%, Cr 3.8%, Mo 2.4%, Zr 2.6%, V 3.1%, Si 0.15%, La 2.4%, Fe 0.18%, and the balance is Ti and unavoidable impurities.

[0075] Comparative Example 4

[0076] The difference between this comparative example and Example 1 is that in Step 4, the forged titanium alloy bar is subjected to high-temperature crystallization in sequence, heated to 760 °C and held for 10 h; then low-temperature annealing is carried out, heated to 660 °C and held for 4 h to obtain a semi-finished titanium alloy bar.

[0077] Comparative Example 5

[0078] The difference between this comparative example and Example 1 is that in Step 5, the semi-finished titanium alloy bar is first solution-treated, and the conditions of the solution treatment are: held at 800 °C for 20 min; then naturally cooled in the furnace to 500 °C and held for 7 h for aging treatment, and then air-cooled to room temperature to obtain a titanium alloy bar.

[0079] Comparative Example 6

[0080] The difference between this comparative example and Example 1 is that: (3) The gear blank is subjected to hot isostatic pressing treatment, the pressure rising rate is 45 MPa / min, the maximum pressure is 170 MPa, and the holding time at the maximum pressure is 2 min to obtain a gear blank body.

[0081] Comparative Example 7

[0082] The difference between this comparative example and Example 1 is that TiC powder, Ti powder, and Ni powder in a ratio of 1:1:1 are mixed.

[0083] Performance Test

[0084] Test the performance of the titanium alloy gears prepared in Examples 1 - 3 and Comparative Examples 1 - 7 of the present invention. The specific test methods are as follows:

[0085] 1. The hardness is tested according to the standard of GB / T4340.1 - 2009 "Metallic materials - Vickers hardness test - Part 1: Test method".

[0086] 2. The wear performance is tested according to the standard of GB / T12444 - 2006 "Test method for wear of metallic materials - Ring - block sliding wear test".

[0087] 3. The contact fatigue performance is tested according to the standard of GB / T14229 - 1993 "Test method for gear contact fatigue strength".

[0088] The test results are shown in Table 1.

[0089] Table 1 Performance test results of titanium alloy gears

[0090]

[0091] From the above performance test results, it can be seen that the titanium alloy gears in Examples 1 - 3 have high hardness, good wear resistance and fatigue resistance. In particular, the comprehensive performance of Example 1 is the most prominent. This is mainly because of the synergistic effect of the specific component ratio of the titanium alloy bar, the component ratio of the hardened layer, and the strengthening process of the titanium alloy gear.

[0092] In the comparative examples, since the necessary technical solutions were not adopted, their performance in the corresponding performance tests was significantly worse than that of the examples. In Comparative Example 1, the component ratio of the titanium alloy bar was changed, and it can be seen that the performance of the titanium alloy at normal and high temperatures decreased. In Comparative Example 2, when the weight percentage of Al was greater than the sum of the weight percentages of Cr and Mo, it can be seen from the results that the contact fatigue limit at normal temperature was affected. In Comparative Example 3, the ratios of Al, Cr, and Zr were different, and it can be seen from the results that the fatigue resistance at high temperature decreased. In Comparative Examples 4 - 6, the treatment conditions of the titanium alloy gears were changed, and it can be seen from the results that the comprehensive performance of the titanium alloy gears was affected. In Comparative Example 7, the component ratio used for the hardened layer cladding was different, and it can be seen from the results that the wear resistance of the titanium alloy gears decreased, indicating that there is a synergistic effect between the components of the hardened layer and the components of the aluminum alloy bar to jointly improve the wear resistance of the titanium alloy gears. The above experimental results further prove the importance of the technical solutions defined in the present invention for its technical effects.

[0093] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A lightweight titanium alloy gear wear-resistant strengthening process, characterized in that: The following steps are involved: (1) Preparing a titanium alloy rod, comprising the following steps: Step 1: The titanium alloy rod comprises the following components in weight percentage: Al 4.5%-5.8%, Cr 3.2%-4.7%, Mo 1.4%-2.7%, Zr 1.8%-2.6%, V 2.3%-3.9%, Si 0.11%-0.19%, La 1.8%-2.7%, Fe 0.12%-0.25%, and the rest is Ti and unavoidable impurities; the components of the titanium alloy rod are mixed uniformly and then pressed to obtain an electrode block; Step 2: melting the electrode block in a vacuum consumable furnace to obtain a titanium alloy blank; Step 3, the titanium alloy billet is forged at 1000° C.-1150° C., and then placed in a fine forging machine for forging at 900° C.-980° C. to obtain a forged titanium alloy bar; Step 4: The forged titanium alloy rod is crystallized and annealed in sequence to obtain a semi-finished titanium alloy rod; Step 5, the semi-finished titanium alloy rod is subjected to solution treatment and aging treatment in sequence, and then air-cooled to room temperature to obtain a titanium alloy rod; (2) Rough processing of titanium alloy bars into gear blanks; (3) The gear blank is subjected to hot isostatic pressing treatment. TiC powder, Ti powder and Ni powder in a weight ratio of 1: (1.4-1.7): (0.2-0.6) are mixed, and a 2-4 μm thick hardened layer is formed on the surface of the gear blank at a power of 2200-2300 W and a scanning speed of 3.0-3.3 mm / s to obtain a titanium alloy gear with a hardened layer; (4) Processing the titanium alloy gear with the hardened layer to a designed size to obtain a titanium alloy gear; The weight percentage of Al is less than the sum of the weight percentages of Cr and Mo; The weight ratio of Al, Cr and Zr is (5.0-5.4):(3.2-3.8):(2.0-2.5).

2. The wear-resistant strengthening process for lightweight titanium alloy gears according to claim 1 is characterized in that: The hot isostatic pressing conditions are: maximum pressure 180-200MPa, pressure increase rate 20-30MPa / min, and holding time 2-4min.

3. The wear-resistant strengthening process for lightweight titanium alloy gears according to claim 1 is characterized in that: The solution treatment method is: keep warm at 750℃-780℃ for 30min-60min; the aging treatment method is: after solution treatment, naturally cool to 520℃-560℃ and keep warm for 4h-6h.

4. The wear-resistant strengthening process for lightweight titanium alloy gears according to claim 1 is characterized in that: The crystallization method is: heating to 950°C-980°C and then keeping warm for 5h-7h; the annealing method is: heating to 600°C-620°C and then keeping warm for 5h-7h.

5. The wear-resistant strengthening process for lightweight titanium alloy gears according to claim 1 is characterized in that: The titanium alloy rod includes the following components in weight percentage: Al 5.2%, Cr 3.3%, Mo 2.4%, Zr 2.4%, V 3.1%, Si 0.15%, La 2.4%, Fe 0.18%, and the rest is Ti and inevitable impurities.

6. The wear-resistant strengthening process for lightweight titanium alloy gears according to claim 1 is characterized in that: In step 2: placing the electrode block in a vacuum consumable furnace, heating it to 1650°C-1670°C at a heating power of 12kW / min-14kW / min, keeping it warm for 20min-25min, and naturally cooling it for 2-3h to obtain a titanium alloy billet.

7. The wear-resistant strengthening process for lightweight titanium alloy gears according to claim 1 is characterized in that: The preparation of the titanium alloy rod also includes the following steps: subjecting the semi-finished titanium alloy rod to solution treatment and aging treatment in sequence, then air cooling to room temperature, and applying a laser sprayed TiN coating on the surface with a thickness of 5-20 μm.

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