A high-strength wide-width titanium strip and its preparation method

Abstract

The present invention relates to the technical field of metal strip coil preparation, and specifically relates to a high-strength wide-width titanium strip and a preparation method thereof. The present invention prepares a wide-width titanium strip substrate by combining cold rolling with annealing heat treatment, and in order to further enhance the wear resistance and oxidation resistance of the titanium strip, the present invention prepares a wear-resistant layer with Ti as the main raw material and W, Co, and WC as auxiliary materials on this basis. The compatibility of the wear-resistant layer with the titanium strip substrate is enhanced by utilizing the characteristics that Ti and Co have good compatibility with the titanium strip substrate and similar thermal expansion coefficients. The hardness of the titanium strip surface is increased by utilizing W and WC, and the titanium strip is subjected to refractory treatment again, thereby reducing the internal thermal stress of the titanium strip prepared by the present invention and avoiding peeling of the wear-resistant layer.

Description

Technical Field

[0001] The present invention relates to the technical field of metal strip coil preparation, in particular to a high-strength wide-width titanium strip and a preparation method thereof. Background Art

[0002] Titanium materials have the characteristics of low density, high strength and strong biocompatibility, and are widely used in aerospace, medical chemical and other fields. However, metal materials such as titanium and titanium alloys have low surface hardness, poor wear resistance, and are easily oxidized by air media such as oxygen, which limits their use. Summary of the Invention

[0003] The object of the present invention is to provide a high-strength wide-width titanium strip and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a high-strength wide-width titanium strip having the following technical features: the high-strength wide-width titanium strip comprises a titanium strip substrate and hardened layers on both sides thereof;

[0005] The titanium strip substrate is made of TC4 titanium strip after cold rolling, and has a width of 600-800 mm;

[0006] The hardened layer comprises the following components: 3.5-5.6% W, 17.6-23.5% Co, 26-31% WC, and the balance Ti.

[0007] A method for preparing a high-strength wide titanium strip comprises the following steps:

[0008] S1. Preparation of titanium tape substrate;

[0009] S11. TA4 titanium strip is subjected to unidirectional cold rolling treatment 4-7 times;

[0010] S12 after step S11 titanium strip degreasing treatment, and annealing heat treatment, heating to 700-800 ℃, heat 1-2.5min;

[0011] S13. The annealed titanium strip is cold-rolled again until the thickness of the titanium strip is (0.1-0.3) mm;

[0012] S14 after step S13 of the titanium strip after processing trimming, removing the edge of the uneven place, again along the middle direction of the titanium strip, again remove 8-15mm from both sides of the edge;

[0013] S15 after step S14 titanium strip degreasing treatment, and annealing heat treatment, heating to 650-700 ℃, heat 2-3min;

[0014] S2. Preparation of hardened layer;

[0015] S21. The W, Co, WC and Ti raw materials were ball-milled in an argon atmosphere into powder particles having a particle size of 30-60 μm and mixed according to weight ratio. The mixture was ball-milled again for 20-30 min and cooled to obtain a mixture.

[0016] S22 using acetone washing step S1 prepared titanium strip substrate, and after drying, the titanium strip substrate surface laser cladding titanium alloy wear-resistant layer, cladding powder feed rate of 80-120g / min;

[0017] S3. The titanium strip treated in step S2 is annealed again and heat-insulated, the temperature is raised to 700-800°C, and the heat is kept for 1-2.5 minutes, and then the strip is cut and rolled to obtain the high-strength wide titanium strip.

[0018] Furthermore, in step S11, during the cold rolling process, the deformation amount of the first cold rolling process is 10-15%, the deformation amount of the second cold rolling process is 7-12%, the deformation amount of the third cold rolling process is 5-8%, and the deformation amount of the remaining cold rolling processes is 4-6%;

[0019] Furthermore, in step S11, during the cold rolling process, the rolling speed is 50-80 m / min, the rolling force is 60-90 KN, and the unit tension is 150-250 kg / mm 2 .

[0020] Furthermore, in step S13, the deformation amount of a single cold rolling treatment is 3-5%.

[0021] Furthermore, in step S21, during ball milling, an anti-agglomeration agent with a total weight of 0.3-0.5 of the mixture is added; the anti-agglomeration agent is stearic acid.

[0022] Furthermore, in step S22, during laser cladding, the laser power is 1600-1800W, the spot diameter is 2-4mm, the processing speed is 20-25m / min, and the overlap rate is 40-60%.

[0023] The present invention first uses TA4 titanium strip coil as raw material, processes the TA4 titanium strip through multiple cold rolling, and then prepares the TA4 titanium strip into a thin titanium strip with a thickness of 0.1-0.3 mm through external force rolling. In order to avoid excessive deformation stress caused by too many early cold rolling times during the rolling process, the present invention adds multiple annealing procedures during the rolling process, and combines the thinner spatial shape of the titanium strip to limit the annealing time to avoid strength loss of the titanium strip caused by excessive annealing holding time.

[0024] When preparing the titanium strip substrate, in order to avoid the generation of microcracks in the titanium strip during the rolling process that affect the preparation of the subsequent wear-resistant layer, the present invention removes 8-15mm of the edge part toward the center of the titanium strip during the trimming process to avoid the microcracks caused by the titanium strip after rolling from developing during the laser cladding process, causing the titanium strip to crack or lose strength.

[0025] On this basis, in order to further improve the wear resistance of the titanium strip, the present invention uses laser cladding to further prepare a wear-resistant layer on its surface with Ti as the main raw material and W, Co, and WC as auxiliary materials. W and WC as hard raw materials can effectively increase the hardness of the titanium strip surface, thereby enhancing its wear resistance, effectively avoiding friction damage caused by the titanium strip during winding and transportation, and effectively improving its oxidation resistance and extending its storage time; and in order to enhance the bonding between the wear-resistant layer and the titanium strip substrate, the present invention adds more Ti and Co raw materials when preparing the wear-resistant layer. As soft components, the two have good compatibility with the titanium strip substrate and have similar thermal expansion coefficients, which can effectively increase the bonding with the titanium strip substrate, reduce thermal expansion stress, and avoid peeling of the wear-resistant layer; thereafter, in order to reduce the thermal stress caused during the preparation of the wear-resistant layer, the titanium strip is further annealed, thereby enhancing the overall desirability of the prepared titanium strip.

[0026] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention prepares a wide titanium strip substrate by combining cold rolling treatment with annealing heat treatment, and in order to further enhance the wear resistance and oxidation resistance of the titanium strip, the present invention, on this basis, prepares a wear-resistant layer with Ti as the main raw material and W, Co, and WC as auxiliary materials, and utilizes the good compatibility of Ti and Co with the titanium strip substrate and the similar thermal expansion coefficients to enhance the compatibility of the wear-resistant layer with the titanium strip substrate, utilizes W and WC to increase the hardness of the titanium strip surface, and performs refractory treatment on it again, thereby reducing the internal thermal stress of the titanium strip prepared by the present invention and avoiding peeling of the wear-resistant layer. DETAILED DESCRIPTION

[0027] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0028] The TA4 titanium strip used in this embodiment has a thickness and width of 1.2 mm and 300 mm.

[0029] Example 1

[0030] A method for preparing a high-strength wide titanium strip comprises the following steps:

[0031] S1. Preparation of titanium tape substrate;

[0032] S11. TA4 titanium strip was subjected to four unidirectional cold rolling processes, with the first cold rolling process yielding 10% deformation, the second cold rolling process yielding 7% deformation, the third cold rolling process yielding 5% deformation, and the fourth cold rolling process yielding 4% deformation. The rolling speed was 50 m / min, the rolling force was 60 kN, and the unit tension was 150 kg / mm. 2 ;

[0033] S12 degreasing the titanium strip after step S11 and annealing and holding treatment, under an argon atmosphere, heating to 700 ° C, holding for 1 minute, and then cooling to room temperature;

[0034] S13 after annealing the titanium strip again cold rolled, a single cold rolling deformation of 4%, until the thickness of the titanium strip obtained is 0.1mm;

[0035] S14 after step S13 of the titanium strip after trimming, removing the edge of the uneven place, again along the middle direction of the titanium strip, again remove 8mm from both sides of the edge;

[0036] S15 after step S14 titanium strip degreasing treatment, and annealing heat treatment, argon atmosphere protection, heating to 650 ℃, heat for 2min;

[0037] S2. Preparation of hardened layer;

[0038] S21. 3.5 parts of W, 17.6 parts of Co, 26 parts of WC, and 52.9 parts of Ti were ball-milled in an argon atmosphere to powder particles having a particle size of 30-60 μm. The powder particles were mixed according to weight ratios, and 0.3 parts of stearic acid was additionally added. The mixture was ball-milled again for 20 minutes and cooled to obtain a mixture.

[0039] S22. The titanium strip substrate prepared in step S1 was washed with acetone and dried. A titanium alloy wear-resistant layer was then laser-clad on the surface of the titanium strip substrate. The powder feed rate was 80 g / min, the laser cladding aperture diameter was 2 mm, the power was 1800 W, the processing speed was 20 m / min, and the overlap ratio was 40%.

[0040] S3. The titanium strip treated in step S2 is annealed and heat-insulated again, the temperature is raised to 700° C., and after heat-insulating for 1 minute, it is cut into titanium strips with a width of 600 mm, and coiled to obtain the high-strength wide titanium strip.

[0041] Example 2

[0042] Compared with Example 1, this embodiment increases the deformation amount in step S11;

[0043] A method for preparing a high-strength wide titanium strip comprises the following steps:

[0044] S1. Preparation of titanium tape substrate;

[0045] S11. TA4 titanium strip was subjected to four unidirectional cold rolling processes. The first cold rolling process had a deformation of 15%, the second cold rolling process had a deformation of 12%, the third cold rolling process had a deformation of 8%, and the fourth cold rolling process had a deformation of 4%. The rolling speed was 50 m / min, the rolling force was 90 kN, and the unit tension was 250 kg / mm. 2 ;

[0046] S12 degreasing the titanium strip after step S11 and annealing and holding treatment, under an argon atmosphere, heating to 700 ° C, holding for 1 minute, and then cooling to room temperature;

[0047] S13 after annealing the titanium strip again cold rolled, a single cold rolling deformation of 4%, until the thickness of the titanium strip obtained is 0.1mm;

[0048] S14 after step S13 of the titanium strip after trimming, removing the edge of the uneven place, again along the middle direction of the titanium strip, again remove 8mm from both sides of the edge;

[0049] S15 after step S14 titanium strip degreasing treatment, and annealing heat treatment, argon atmosphere protection, heating to 650 ℃, heat for 2min;

[0050] S2. Preparation of hardened layer;

[0051] S21. 3.5 parts of W, 17.6 parts of Co, 26 parts of WC, and 52.9 parts of Ti were ball-milled in an argon atmosphere to powder particles having a particle size of 30-60 μm. The powder particles were mixed according to weight ratios, and 0.3 parts of stearic acid was additionally added. The mixture was ball-milled again for 20 minutes and cooled to obtain a mixture.

[0052] S22. The titanium strip substrate prepared in step S1 was washed with acetone and dried. A titanium alloy wear-resistant layer was then laser-clad on the surface of the titanium strip substrate. The powder feed rate was 80 g / min, the laser cladding aperture diameter was 2 mm, the power was 1800 W, the processing speed was 20 m / min, and the overlap ratio was 40%.

[0053] S3. The titanium strip treated in step S2 is annealed and heat-insulated again, the temperature is raised to 700° C., and after heat-insulating for 1 minute, it is cut into titanium strips with a width of 600 mm, and coiled to obtain the high-strength wide titanium strip.

[0054] Example 3

[0055] Compared with Example 1, this embodiment increases the annealing temperature in step S12;

[0056] A method for preparing a high-strength wide titanium strip comprises the following steps:

[0057] S1. Preparation of titanium tape substrate;

[0058] S11. TA4 titanium strip was subjected to four unidirectional cold rolling processes, with the first cold rolling process yielding 10% deformation, the second cold rolling process yielding 7% deformation, the third cold rolling process yielding 5% deformation, and the fourth cold rolling process yielding 4% deformation. The rolling speed was 50 m / min, the rolling force was 60 kN, and the unit tension was 150 kg / mm. 2 ;

[0059] S12 degreasing the titanium strip after step S11 and annealing and holding the strip under an argon atmosphere, heating to 800°C, holding for 1 minute, and then cooling to room temperature;

[0060] S13 after annealing the titanium strip again cold rolled, a single cold rolling deformation of 4%, until the thickness of the titanium strip obtained is 0.1mm;

[0061] S14 after step S13 of the titanium strip after trimming, removing the edge of the uneven place, again along the middle direction of the titanium strip, again remove 8mm from both sides of the edge;

[0062] S15 after step S14 titanium strip degreasing treatment, and annealing heat treatment, argon atmosphere protection, heating to 650 ℃, heat for 2min;

[0063] S2. Preparation of hardened layer;

[0064] S21. 3.5 parts of W, 17.6 parts of Co, 26 parts of WC, and 52.9 parts of Ti were ball-milled in an argon atmosphere to powder particles having a particle size of 30-60 μm. The powder particles were mixed according to weight ratios, and 0.3 parts of stearic acid was additionally added. The mixture was ball-milled again for 20 minutes and cooled to obtain a mixture.

[0065] S22. The titanium strip substrate prepared in step S1 was washed with acetone and dried. A titanium alloy wear-resistant layer was then laser-clad on the surface of the titanium strip substrate. The powder feed rate was 80 g / min, the laser cladding aperture diameter was 2 mm, the power was 1800 W, the processing speed was 20 m / min, and the overlap ratio was 40%.

[0066] S3. The titanium strip treated in step S2 is annealed and heat-insulated again, the temperature is raised to 700° C., and after heat-insulating for 1 minute, it is cut into titanium strips with a width of 600 mm, and coiled to obtain the high-strength wide titanium strip.

[0067] Example 4

[0068] Compared with Example 1, this embodiment increases the powder feeding amount in step S22;

[0069] A method for preparing a high-strength wide titanium strip comprises the following steps:

[0070] S1. Preparation of titanium tape substrate;

[0071] S11. TA4 titanium strip was subjected to four unidirectional cold rolling processes, with the first cold rolling process yielding 10% deformation, the second cold rolling process yielding 7% deformation, the third cold rolling process yielding 5% deformation, and the fourth cold rolling process yielding 4% deformation. The rolling speed was 50 m / min, the rolling force was 60 kN, and the unit tension was 150 kg / mm. 2 ;

[0072] S12 degreasing the titanium strip after step S11 and annealing and holding treatment, under an argon atmosphere, heating to 700 ° C, holding for 1 minute, and then cooling to room temperature;

[0073] S13 after annealing the titanium strip again cold rolled, a single cold rolling deformation of 4%, until the thickness of the titanium strip obtained is 0.1mm;

[0074] S14 after step S13 of the titanium strip after trimming, removing the edge of the uneven place, again along the middle direction of the titanium strip, again remove 8mm from both sides of the edge;

[0075] S15 after step S14 titanium strip degreasing treatment, and annealing heat treatment, argon atmosphere protection, heating to 650 ℃, heat for 2min;

[0076] S2. Preparation of titanium silicon hardened layer;

[0077] S21. 3.5 parts of W, 17.6 parts of Co, 26 parts of WC, and 52.9 parts of Ti were ball-milled in an argon atmosphere to powder particles having a particle size of 30-60 μm. The powder particles were mixed according to weight ratios, and 0.3 parts of stearic acid was additionally added. The mixture was ball-milled again for 20 minutes and cooled to obtain a mixture.

[0078] S22. The titanium strip substrate prepared in step S1 was washed with acetone and dried. A titanium alloy wear-resistant layer was then laser-clad on the surface of the titanium strip substrate. The powder feed rate was 120 g / min, the laser cladding aperture diameter was 2 mm, the power was 1800 W, the processing speed was 20 m / min, and the overlap ratio was 40%.

[0079] S3. The titanium strip treated in step S2 is annealed and heat-insulated again, the temperature is raised to 700° C., and after heat-insulating for 1 minute, it is cut into titanium strips with a width of 600 mm, and coiled to obtain the high-strength wide titanium strip.

[0080] Example 5

[0081] Compared with Example 1, this embodiment increases the processing speed of laser cladding in step S22;

[0082] A method for preparing a high-strength wide titanium strip comprises the following steps:

[0083] S1. Preparation of titanium tape substrate;

[0084] S11. TA4 titanium strip was subjected to four unidirectional cold rolling processes, with the first cold rolling process yielding 10% deformation, the second cold rolling process yielding 7% deformation, the third cold rolling process yielding 5% deformation, and the fourth cold rolling process yielding 4% deformation. The rolling speed was 50 m / min, the rolling force was 60 kN, and the unit tension was 150 kg / mm. 2 ;

[0085] S12 degreasing the titanium strip after step S11 and annealing and holding treatment, under an argon atmosphere, heating to 700 ° C, holding for 1 minute, and then cooling to room temperature;

[0086] S13 after annealing the titanium strip again cold rolled, a single cold rolling deformation of 4%, until the thickness of the titanium strip obtained is 0.1mm;

[0087] S14 after step S13 of the titanium strip after trimming, removing the edge of the uneven place, again along the middle direction of the titanium strip, again remove 8mm from both sides of the edge;

[0088] S15 after step S14 titanium strip degreasing treatment, and annealing heat treatment, argon atmosphere protection, heating to 650 ℃, heat for 2min;

[0089] S2. Preparation of hardened layer;

[0090] S21. 3.5 parts of W, 17.6 parts of Co, 26 parts of WC, and 52.9 parts of Ti were ball-milled in an argon atmosphere to powder particles having a particle size of 30-60 μm. The powder particles were mixed according to weight ratios, and 0.3 parts of stearic acid was additionally added. The mixture was ball-milled again for 20 minutes and cooled to obtain a mixture.

[0091] S22. The titanium strip substrate prepared in step S1 was washed with acetone and dried. A titanium alloy wear-resistant layer was then laser-clad on the surface of the titanium strip substrate. The powder feed rate was 80 g / min, the laser cladding aperture diameter was 2 mm, the power was 1800 W, the processing speed was 25 m / min, and the overlap ratio was 40%.

[0092] S3. The titanium strip treated in step S2 is annealed and heat-insulated again, the temperature is raised to 700° C., and after heat-insulating for 1 minute, it is cut into titanium strips with a width of 600 mm, and coiled to obtain the high-strength wide titanium strip.

[0093] Example 6

[0094] Compared with Example 1, this embodiment increases the power of laser cladding;

[0095] A method for preparing a high-strength wide titanium strip comprises the following steps:

[0096] S1. Preparation of titanium tape substrate;

[0097] S11. TA4 titanium strip was subjected to four unidirectional cold rolling processes, with the first cold rolling process yielding 10% deformation, the second cold rolling process yielding 7% deformation, the third cold rolling process yielding 5% deformation, and the fourth cold rolling process yielding 4% deformation. The rolling speed was 50 m / min, the rolling force was 60 kN, and the unit tension was 150 kg / mm. 2 ;

[0098] S12 degreasing the titanium strip after step S11 and annealing and holding treatment, under an argon atmosphere, heating to 700 ° C, holding for 1 minute, and then cooling to room temperature;

[0099] S13 after annealing the titanium strip again cold rolled, a single cold rolling deformation of 4%, until the thickness of the titanium strip obtained is 0.1mm;

[0100] S14 after step S13 of the titanium strip after trimming, removing the edge of the uneven place, again along the middle direction of the titanium strip, again remove 8mm from both sides of the edge;

[0101] S15 after step S14 titanium strip degreasing treatment, and annealing heat treatment, argon atmosphere protection, heating to 650 ℃, heat for 2min;

[0102] S2. Preparation of hardened layer;

[0103] S21. 3.5 parts of W, 17.6 parts of Co, 26 parts of WC, and 52.9 parts of Ti were ball-milled in an argon atmosphere to powder particles having a particle size of 30-60 μm. The powder particles were mixed according to weight ratios, and 0.3 parts of stearic acid was additionally added. The mixture was ball-milled again for 20 minutes and cooled to obtain a mixture.

[0104] S22. The titanium strip substrate prepared in step S1 was washed with acetone and dried. A titanium alloy wear-resistant layer was then laser-clad on the surface of the titanium strip substrate. The powder feed rate was 80 g / min, the laser cladding aperture diameter was 2 mm, the power was 2000 W, the processing speed was 20 m / min, and the overlap ratio was 40%.

[0105] S3. The titanium strip treated in step S2 is annealed and heat-insulated again, the temperature is raised to 700° C., and after heat-insulating for 1 minute, it is cut into titanium strips with a width of 600 mm, and coiled to obtain the high-strength wide titanium strip.

[0106] Example 7

[0107] A method for preparing a high-strength wide titanium strip comprises the following steps:

[0108] S1. Preparation of titanium tape substrate;

[0109] S11. TA4 titanium strip was subjected to seven unidirectional cold rolling cycles, with the first cold rolling cycle achieving a deformation of 15%, the second cold rolling cycle achieving a deformation of 12%, the third cold rolling cycle achieving a deformation of 8%, and the remaining cold rolling cycles achieving a deformation of 6%. The rolling speed was 50 m / min, the rolling force was 90 kN, and the unit tension was 250 kg / mm. 2 ;

[0110] S12 degreasing the titanium strip after step S11 and annealing and holding treatment, under an argon atmosphere, heating to 800 ° C, holding for 2.5 minutes, and then cooling to room temperature;

[0111] S13 after annealing the titanium strip again cold rolled, a single cold rolling deformation of 5%, until the thickness of the titanium strip obtained is 0.1mm;

[0112] S14 after step S13 of the titanium strip after trimming, removing the edge of the uneven place, again along the middle direction of the titanium strip, again remove 8mm from both sides of the edge;

[0113] S15 after step S14 titanium strip degreasing treatment, and annealing heat treatment, argon atmosphere protection, heating to 700 ℃, heat for 3min;

[0114] S2. Preparation of hardened layer;

[0115] S21. 5.6 parts of W, 23.5 parts of Co, 31 parts of WC, and 39.9 parts of Ti were ball-milled in an argon atmosphere to powder particles having a particle size of 30-60 μm. The powder particles were mixed according to weight ratios, and 0.5 parts of stearic acid was additionally added. The mixture was ball-milled again for 30 minutes and cooled to obtain a mixture.

[0116] S22. The titanium strip substrate prepared in step S1 was washed with acetone and dried. A titanium alloy wear-resistant layer was then laser-clad on the surface of the titanium strip substrate. The powder feed rate was 120 g / min, the laser cladding aperture diameter was 4 mm, the power was 2000 W, the processing speed was 25 m / min, and the overlap ratio was 60%.

[0117] S3. The titanium strip treated in step S2 is annealed and heat-insulated again, the temperature is raised to 800°C, and the heat is kept for 2.5 minutes, and then the strip is cut into strips with a width of 600 mm and coiled to obtain the high-strength wide titanium strip.

[0118] Comparative Example 1.

[0119] Compared with Example 1, no hardened layer was prepared in this comparative example;

[0120] A method for preparing a high-strength wide titanium strip comprises the following steps:

[0121] S1. Preparation of titanium tape substrate;

[0122] S11. TA4 titanium strip was subjected to four unidirectional cold rolling processes, with the first cold rolling process yielding 10% deformation, the second cold rolling process yielding 7% deformation, the third cold rolling process yielding 5% deformation, and the fourth cold rolling process yielding 4% deformation. The rolling speed was 50 m / min, the rolling force was 60 kN, and the unit tension was 150 kg / mm. 2 ;

[0123] S12 degreasing the titanium strip after step S11 and annealing and holding treatment, under an argon atmosphere, heating to 700 ° C, holding for 1 minute, and then cooling to room temperature;

[0124] S13 after annealing the titanium strip again cold rolled, a single cold rolling deformation of 4%, until the thickness of the titanium strip obtained is 0.1mm;

[0125] S14 after step S13 of the titanium strip after trimming, removing the edge of the uneven place, again along the middle direction of the titanium strip, again remove 8mm from both sides of the edge;

[0126] S15. Degreasing the titanium strip after step S14, annealing and heat preservation treatment, heating to 650°C in an argon atmosphere, keeping the temperature for 2 minutes, cutting into titanium strips with a width of 600 mm, and coiling to obtain the high-strength wide titanium strip.

[0127] Comparative Example 2.

[0128] Compared with Example 1, this comparative example did not perform step S14;

[0129] A method for preparing a high-strength wide titanium strip comprises the following steps:

[0130] S1. Preparation of titanium tape substrate;

[0131] S11. TA4 titanium strip was subjected to four unidirectional cold rolling processes, with the first cold rolling process yielding 10% deformation, the second cold rolling process yielding 7% deformation, the third cold rolling process yielding 5% deformation, and the fourth cold rolling process yielding 4% deformation. The rolling speed was 50 m / min, the rolling force was 60 kN, and the unit tension was 150 kg / mm. 2 ;

[0132] S12 degreasing the titanium strip after step S11 and annealing and holding treatment, under an argon atmosphere, heating to 700 ° C, holding for 1 minute, and then cooling to room temperature;

[0133] S13 after annealing the titanium strip again cold rolled, a single cold rolling deformation of 4%, until the thickness of the titanium strip obtained is 0.1mm;

[0134] S14 after step S13 of the titanium strip after trimming, removing the edge of the uneven place, again along the middle direction of the titanium strip, again remove 8mm from both sides of the edge;

[0135] S15 after step S14 titanium strip degreasing treatment, and annealing heat treatment, argon atmosphere protection, heating to 650 ℃, heat for 2min;

[0136] S2. Preparation of hardened layer;

[0137] S21. 3.5 parts of W, 17.6 parts of Co, 26 parts of WC, and 52.9 parts of Ti were ball-milled in an argon atmosphere to powder particles having a particle size of 30-60 μm. The powder particles were mixed according to weight ratios, and 0.3 parts of stearic acid was additionally added. The mixture was ball-milled again for 20 minutes and cooled to obtain a mixture.

[0138] S22. The titanium strip substrate prepared in step S1 was washed with acetone and dried. A titanium alloy wear-resistant layer was then laser-clad on the surface of the titanium strip substrate. The powder feed rate was 80 g / min, the laser cladding aperture diameter was 2 mm, the power was 1800 W, the processing speed was 20 m / min, and the overlap ratio was 40%.

[0139] S3. The titanium strip treated in step S2 is annealed and heat-insulated again, the temperature is raised to 700° C., and after heat-insulating for 1 minute, it is cut into titanium strips with a width of 600 mm, and coiled to obtain the high-strength wide titanium strip.

[0140] Testing: Examples 1-7 and Comparative Examples 1-2 were subjected to appearance testing, and their edge cracks were also tested. A universal tensile tester was used to test their tensile strength and elongation after fracture. A Vickers hardness tester was used to test their hardness. The test results are shown in the following table:

[0141] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for preparing a high-strength wide titanium strip, characterized in that: The following steps are involved: S1. Preparation of titanium tape substrate; S11. TA4 titanium strip is subjected to unidirectional cold rolling treatment 4-7 times; S12 after step S11 titanium strip degreasing treatment, and annealing heat treatment, heating to 700-800 ℃, heat 1-2.5min; S13 after annealing the titanium strip is cold rolled again until the thickness of the titanium strip is 0.1-0.3mm; S14 after step S13 of the titanium strip after processing trimming, removing the edge of the uneven place, again along the middle direction of the titanium strip, again remove 8-15mm from both sides of the edge; S15 after step S14 titanium strip degreasing treatment, and annealing heat treatment, heating to 650-700 ℃, heat 2-3min; S2. Preparation of hardened layer; S21. The W, Co, WC and Ti raw materials were ball-milled in an argon atmosphere into powder particles having a particle size of 30-60 μm and mixed according to weight ratio. The mixture was ball-milled again for 20-30 min and cooled to obtain a mixture. S22 using acetone washing step S1 prepared titanium strip substrate, and after drying, the titanium strip substrate surface laser cladding titanium alloy wear-resistant layer, cladding powder feed rate of 80-120g / min; S3. The titanium strip treated in step S2 is annealed again and heated to 700-800°C for 1-2.5 minutes, then cut and rolled to obtain the high-strength wide titanium strip. The width of the titanium strip substrate is 600-800 mm; the hardened layer comprises the following components by weight percentage: 3.5-5.6% W, 17.6-23.5% Co, 26-31% WC, and the balance Ti; In step S11, during the cold rolling process, the deformation amount of the first cold rolling process is 10-15%, the deformation amount of the second cold rolling process is 7-12%, the deformation amount of the third cold rolling process is 5-8%, and the deformation amount of the remaining cold rolling processes is 4-6%; In step S13, the deformation amount of a single cold rolling process is 3-5%.

2. The method for preparing a high-strength wide titanium strip according to claim 1, characterized in that: In step S11, during the cold rolling process, the rolling speed is 50-80 m / min, the rolling force is 60-90 kN, and the unit tension is 150-250 kg / mm 2 .

3. The method for preparing a high-strength wide titanium strip according to claim 1, characterized in that: In step S21, during ball milling, an anti-agglomeration agent is added in an amount of 0.3-0.5% by weight of the total weight of the mixture; the anti-agglomeration agent is stearic acid.

4. The method for preparing a high-strength wide titanium strip according to claim 1, characterized in that: In step S22, during laser cladding, the laser power is 1600-1800W, the spot diameter is 2-4mm, the processing speed is 20-25m / min, and the overlap rate is 40-60%.

5. The high-strength wide titanium strip prepared by the method for preparing a high-strength wide titanium strip according to claim 1.

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