Near-beta-state Ti15Mo titanium alloy plate and preparation method thereof
Through multi-fire rolling and phase change point heat treatment, a high-strength and high-plastic near-β-state Ti15Mo titanium alloy plate was prepared, which solved the contradiction between strength and plasticity of Ti15Mo alloy plate, and achieved durability and structural integrity in the medical devices and chemical fields.
Patent Information
- Application Number
- CN202510656375.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-21
- Publication Date
- 2025-08-19
AI Technical Summary
The existing Ti15Mo alloy sheets have a certain high strength and are difficult to meet the high plasticity requirements at the same time, resulting in cracks and fractures easily during multiple bends, limiting their durability and structural integrity in complex scenarios such as medical devices and chemicals.
Through multi-fire rolling and heat treatment near phase change points, combined with surface oxide scale removal treatment, a near-β-state Ti15Mo titanium alloy plate with uniform and fine tissue was prepared. The specific steps include selecting α+β-state slabs, multi-fire rolling, heat treatment at phase change points and surface treatment to obtain high-plastic plates with tensile strength Rm≥690MPa, yield strength≥480MPa, and elongation A≥25%.
The prepared near-beta Ti15Mo titanium alloy sheet has excellent plasticity and bending properties while maintaining high strength, and can meet the durability and structural integrity requirements in complex scenarios in the fields of medical devices and chemicals.
Smart Images
Figure CN120505577A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of titanium alloy processing, relates to a method for preparing a near-β Ti15Mo titanium alloy plate, and also relates to a near-β Ti15Mo titanium alloy plate prepared by the method. Background Art
[0002] Ti15Mo alloy is a β-type titanium alloy with excellent biocompatibility, corrosion resistance, and high strength. It is widely used in medical devices, chemical industry, and aerospace. Traditional Ti15Mo alloy sheet has a contradiction between strength and plasticity. It has a certain degree of high strength but lacks the ability to meet the requirements of high plasticity. It is prone to cracking and breaking during repeated bending and use, limiting its durability and structural integrity in complex applications such as medical devices and chemical industry. Summary of the Invention
[0003] The first object of the present invention is to provide a method for preparing a near-β-state Ti15Mo titanium alloy plate. By performing multiple fire rolling at the phase transformation point and heat treatment near the phase transformation point, a near-β-state Ti15Mo titanium alloy plate with good strength characteristics and high plasticity is obtained, which solves the problem that existing Ti15Mo alloy plates have a certain high strength and are difficult to meet high plasticity requirements at the same time.
[0004] The second object of the present invention is to provide a near-β Ti15Mo titanium alloy plate prepared by the above method.
[0005] The first technical solution adopted by the present invention is a method for preparing a near-β state high-plasticity Ti15Mo titanium alloy plate, and the specific steps are as follows: Step 1: Selecting an α+β Ti15Mo slab that meets the requirements; Step 2: The selected α+β Ti15Mo slab is subjected to multiple heat rolling at the phase transition point to obtain a first finished slab with fine structure and straightness ≤3 mm / m; Step 3: heat treating the first finished slab at a temperature below the phase transition point to obtain a near-β Ti15Mo titanium alloy plate; Step 4: removing the surface oxide scale of the near-β-state Ti15Mo titanium alloy plate to obtain a second finished plate; Step 5: Cut and blank the second finished plate to obtain a near-β state high-plasticity Ti15Mo titanium alloy plate.
[0006] The present invention is also characterized in that: The α+β Ti15Mo slab selected in step 1 meets the following conditions: thickness of 10-40 mm, uniform structure, no cracks and folds visible to the naked eye on the surface after treatment, and no abnormal metallurgical defects during flaw detection.
[0007] The specific method of step 2 is: The selected α+β Ti15Mo slab is heated for the first time at the phase transition point to obtain a fully heated slab; The fully heated slab is then passed through a plate rolling mill for multiple heat rolling and deformation to obtain the target slab. Finally, the target slab is straightened by the rolling mill using the waste heat to obtain the first finished slab with uniform and fine structure and straightness ≤3mm / m.
[0008] The temperature of the first heating is 20 to 50°C below the phase transition point, and the heating time is 1.0 to 4.0 hours.
[0009] In multi-pass rolling, the total deformation of a single pass is ≤80%, the deformation of a single pass is ≤25%, and the deformation of the last pass of the finished product rolling is 5-10%.
[0010] The specific method of step 3 is: heating the first finished slab for a second time at a temperature below the phase transition point to obtain a fully heat-treated slab; The slab that has been fully heat treated is taken out of the furnace and water-cooled to obtain a near-β Ti15Mo titanium alloy plate with uniform and fine structure and performance that meets the requirements.
[0011] The temperature of the second heating is 5 to 40°C below the phase transition point temperature, and the time is 20 to 120 minutes. After the heat treatment, it is cooled by water, and the heat treatment water transfer time is ≤60 seconds.
[0012] In step 4, the near-β Ti15Mo titanium alloy plate is surface-treated by grinding, sanding or planing to obtain a second finished plate with a roughness Ra≤3.2 μm.
[0013] The second technical solution adopted by the present invention is that the near-β-state Ti15Mo titanium alloy plate is obtained by the above-mentioned preparation method, and the near-β-state Ti15Mo titanium alloy plate has a tensile strength Rm ≥ 690MPa, a yield strength ≥ 480MPa, an elongation A ≥ 25%, and an HV hardness ≥ 250.
[0014] The beneficial effects of the present invention are: The present invention discloses a method for preparing a near-β-state high-plasticity Ti15Mo titanium alloy sheet, which comprises sheet rolling, holding at a temperature near the phase transition point, water quenching, surface treatment, and cutting to ultimately produce a sheet with a tensile strength Rm ≥ 690 MPa, a yield strength ≥ 480 MPa, an elongation A ≥ 25%, and an HV hardness ≥ 250. The Ti15Mo titanium alloy sheet produced by the above steps exhibits both high strength and high plasticity, meeting the durability and structural integrity requirements of Ti15Mo sheets in complex applications such as medical devices and the chemical industry. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 8.5 mm Ti15Mo alloy prepared in Example 1 of the present invention; Figure 2 7.0 mm Ti15Mo alloy prepared in Example 2 of the present invention; Figure 3 1 is a metallographic structure diagram of the δ6.1mm Ti15Mo alloy prepared in Example 3 of the present invention; Figure 4 4.3 mm Ti15Mo alloy prepared in Example 4 of the present invention; Figure 5 3.6 mm Ti15Mo alloy prepared in Example 5 of the present invention; Figure 6 This is the metallographic structure diagram of the δ3.0mm Ti15Mo alloy prepared in Example 6 of the present invention. DETAILED DESCRIPTION
[0016] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0017] The preparation method of the nearly β-state high-plasticity Ti15Mo titanium alloy plate of the present invention comprises the following specific steps: Step 1: Selecting an α+β Ti15Mo slab that meets the requirements; The selected α+β Ti15Mo slabs meet the following conditions: thickness of 10~40mm, uniform structure, no cracks and folds visible to the naked eye on the surface after treatment, and no abnormal metallurgical defects during flaw detection.
[0018] Specifically, in the present invention, the thickness of the slab is determined according to the specifications of the titanium alloy strip and the total processing rate of 80%. The slab is selected according to the thickness of the finished titanium alloy plate. The surface of the selected slab has no defects visible to the naked eye, and the grinding area needs to be smooth.
[0019] Step 2: The selected α+β Ti15Mo slab is subjected to multiple heat rolling at the phase transition point to obtain a first finished slab with fine structure and straightness ≤ 3 mm / m; the specific method is: The selected α+β Ti15Mo slab is first heated at the phase transition point. The first heating temperature is 20-50°C below the phase transition point temperature and the heating time is 1.0-4.0h to obtain a fully heated slab. The fully heated slab is then passed through a plate rolling mill for multi-pass rolling, and the target slab is obtained through multi-pass rolling deformation. The thickness of the target slab is 1.05 to 1.1 times the thickness of the rolled product slab. The total deformation of a single pass in the multi-pass rolling is ≤80%, the deformation of a single pass is ≤25%, and the deformation of the final pass of the finished product is 5 to 10%. Finally, the target slab is straightened by the rolling mill using the waste heat to obtain the first finished slab with uniform and fine structure and straightness ≤3mm / m.
[0020] Step 3: heat-treating the first finished slab at a temperature below the phase transition point to obtain a near-β Ti15Mo titanium alloy plate; the specific method is: The first finished slab is subjected to a second heating at a temperature below the phase transition point, wherein the second heating temperature is 5 to 40°C below the phase transition point and the time is 20 to 120 minutes to obtain a fully heat-treated slab; The slab that has been fully heat treated is taken out of the furnace and water-cooled. After the heat treatment, it is cooled by water. The heat treatment water transfer time is ≤60s, and a near-β Ti15Mo titanium alloy plate with uniform and fine structure and performance that meets the requirements is obtained.
[0021] Step 4: Descaling the surface of the near-β Ti15Mo titanium alloy plate by polishing, sanding, or planing to obtain a second finished plate with a roughness of Ra ≤ 3.2 μm. Step 5: Cut and blank the second finished plate to obtain a near-β state high-plasticity Ti15Mo titanium alloy plate.
[0022] The near-β-state Ti15Mo titanium alloy plate of the present invention is obtained by the above-mentioned preparation method. The near-β-state Ti15Mo titanium alloy plate has a tensile strength Rm≥690MPa, a yield strength≥480MPa, an elongation A≥25%, and an HV hardness≥250.
[0023] The Ti15Mo titanium alloy plate produced by the present invention has certain high strength and high plasticity, and can meet the use requirements of Ti15Mo plate for high plasticity, durability, and bending structural integrity in complex scenarios in medical equipment, chemical industry and other fields.
[0024] The plate prepared by the present application has relatively good bending performance in application. Conventional medical titanium alloy plates (common Ti6Al4VE) will crack and break after being bent at 105° and cold-bent twice; Ti15Mo alloy in the α+β state can be bent 5 to 6 times; the near-β state prepared by the present application can be bent more than 10 times. While having a certain strength, it has high plasticity and bending performance.
[0025] Example 1 The preparation method of the near-β state high plasticity Ti15Mo titanium alloy plate has the following specific steps: Step 1: Select an α+β Ti15Mo slab with uniform structure at δ40mm, no visible cracks, folds or other defects on the surface, and no abnormal metallurgical defects after flaw detection; Step 2: The selected α+β state Ti15Mo slab is heated for the first time at Tβ-50°C for 4.0h; the fully heated slab is then passed through a plate rolling mill for multiple-pass rolling to δ9.0mm. The processing rate of the titanium alloy finished slab during rolling is 78%, the deformation of a single rolling pass is 25%, and the deformation of the last pass is 10%; finally, the target slab is straightened through the rolling mill using the residual heat to obtain a first finished slab with uniform and fine structure and straightness ≤3mm / m.
[0026] Step 3: The first finished slab is heated for a second time at Tβ-40°C for 120 minutes, cooled by water after heat treatment, and the heat treatment water transfer time is 60 seconds to obtain a near-β state Ti15Mo titanium alloy plate with uniform and fine structure and performance that meets the requirements.
[0027] Step 4: Planing and milling the near-β Ti15Mo titanium alloy plate, and cutting and blanking to obtain Ti15Mo titanium alloy plates with a thickness of δ8.5 mm.
[0028] Example 2 The preparation method of the near-β state high plasticity Ti15Mo titanium alloy plate has the following specific steps: Step 1: Select an α+β Ti15Mo slab with uniform structure within δ30mm, no visible cracks, folds or other defects on the surface, and no abnormal metallurgical defects during flaw detection; Step 2: The selected α+β state Ti15Mo slab is heated for the first time at Tβ-50°C for 3.0h; the fully heated slab is then passed through a plate rolling mill for multiple-pass rolling to δ7.5mm. The processing rate of the titanium alloy finished slab during rolling is 75%, the deformation of a single rolling pass is 25%, and the deformation of the last pass is 6%; finally, the target slab is straightened through the rolling mill using the residual heat to obtain a first finished slab with uniform and fine structure and straightness ≤3mm / m.
[0029] Step 3: The first finished slab is heated for a second time at Tβ-30°C for 100 minutes, cooled by water after heat treatment, and the heat treatment water transfer time is 50 seconds to obtain a near-β state Ti15Mo titanium alloy plate with uniform and fine structure and performance that meets the requirements.
[0030] Step 4: Planing and milling the near-β Ti15Mo titanium alloy plate, and cutting and blanking to obtain Ti15Mo titanium alloy plates with a thickness of δ7.0 mm.
[0031] Example 3 The preparation method of the near-β state high plasticity Ti15Mo titanium alloy plate has the following specific steps: Step 1: Select α+β Ti15Mo slabs with uniform structure of δ25mm, no visible cracks and folds on the surface, and no abnormal metallurgical defects after flaw detection; Step 2: The selected α+β state Ti15Mo slab is heated for the first time at Tβ-40°C for 3.0h; the fully heated slab is then passed through a plate rolling mill for multiple-pass rolling to δ6.5mm. The processing rate of the titanium alloy finished slab during rolling is 74%, the deformation of a single rolling pass is 25%, and the deformation of the last pass is 7%; finally, the target slab is straightened through the rolling mill using the residual heat to obtain a first finished slab with uniform and fine structure and a straightness of ≤3mm / m.
[0032] Step 3: The first finished slab is heated for a second time at Tβ-25°C for 90 minutes, cooled by water after heat treatment, and the heat treatment water transfer time is 40 seconds to obtain a near-β state Ti15Mo titanium alloy plate with uniform and fine structure and performance that meets the requirements.
[0033] Step 4: polish the near-β Ti15Mo titanium alloy sheet, and cut and cut the sheet to obtain Ti15Mo titanium alloy sheets with a thickness of δ6.1 mm.
[0034] Example 4 The preparation method of the near-β state high plasticity Ti15Mo titanium alloy plate has the following specific steps: Step 1: Select α+β Ti15Mo slabs with uniform structure of δ15mm, no visible cracks and folds on the surface, and no abnormal metallurgical defects after flaw detection; Step 2: The selected α+β state Ti15Mo slab is heated for the first time at Tβ-30°C for 2.0h; the fully heated slab is then passed through a plate rolling mill for multiple rounds of rolling until it is reduced to δ4.7mm. The processing rate of the titanium alloy finished slab during rolling is 68%, the deformation of a single rolling pass is 25%, and the deformation of the last pass is 6%; finally, the target slab is straightened through the rolling mill using the residual heat to obtain a first finished slab with uniform and fine structure and a straightness of ≤3mm / m.
[0035] Step 3: The first finished slab is heated for a second time at Tβ-30°C for 60 minutes, cooled by water after heat treatment, and the heat treatment water transfer time is 40 seconds to obtain a near-β state Ti15Mo titanium alloy plate with uniform and fine structure and performance that meets the requirements.
[0036] Step 4: polish the near-β Ti15Mo titanium alloy sheet, and cut and cut the sheet to obtain Ti15Mo titanium alloy sheets with a thickness of δ4.3 mm.
[0037] Example 5 The preparation method of the near-β state high plasticity Ti15Mo titanium alloy plate has the following specific steps: Step 1: Select α+β Ti15Mo slabs with uniform structure of δ12mm, no visible cracks and folds on the surface, and no abnormal metallurgical defects after flaw detection; Step 2: The selected α+β state Ti15Mo slab is heated for the first time at Tβ-20°C for 1.5 hours; the fully heated slab is then passed through a plate rolling mill for multiple rounds of rolling until it is reduced to δ3.9mm. The processing rate of the titanium alloy finished slab during rolling is 68%, the deformation of a single rolling pass is 25%, and the deformation of the last pass is 7%; finally, the target slab is straightened through the rolling mill using the residual heat to obtain a first finished slab with uniform and fine structure and a straightness of ≤3mm / m.
[0038] Step 3: The first finished slab is heated for a second time at Tβ-5°C for 40 minutes, cooled by water after heat treatment, and the heat treatment water transfer time is 30 seconds to obtain a near-β state Ti15Mo titanium alloy plate with uniform and fine structure and performance that meets the requirements.
[0039] Step 4: sanding the near-β Ti15Mo titanium alloy sheet, and cutting and blanking to obtain Ti15Mo titanium alloy sheets with a thickness of δ3.6 mm.
[0040] Example 6 The preparation method of the near-β state high plasticity Ti15Mo titanium alloy plate has the following specific steps: Step 1: Select an α+β Ti15Mo slab with uniform microstructure of δ10mm, no visible cracks or folds on the surface, and no abnormal metallurgical defects after flaw detection; Step 2: The selected α+β state Ti15Mo slab is heated for the first time at Tβ-20°C for 1.0h; the fully heated slab is then passed through a plate rolling mill for multiple-pass rolling to δ3.2mm. The processing rate of the titanium alloy finished slab during rolling is 68%, the deformation of a single rolling pass is 25%, and the deformation of the last pass is 5%; finally, the target slab is straightened through the rolling mill using the residual heat to obtain a first finished slab with uniform and fine structure and a straightness of ≤3mm / m.
[0041] Step 3: The first finished slab is heated for a second time at Tβ-5°C for 20 minutes, cooled by water after heat treatment, and the heat treatment water transfer time is 30 seconds to obtain a near-β state Ti15Mo titanium alloy plate with uniform and fine structure and performance that meets the requirements.
[0042] Step 4: sanding the near-β Ti15Mo titanium alloy sheet, and cutting and blanking to obtain Ti15Mo titanium alloy sheets with a thickness of δ3.0 mm.
[0043] The metallographic microstructure of the finished plate of the near-β Ti15Mo alloy prepared in Examples 1 to 6 is as follows: Figures 1 to 6 shown.
[0044] The products obtained in Examples 1 to 6 were subjected to performance testing. The test results are shown in Table 1. Table 2 shows the comparative performance test results of titanium alloy plate products with the same purpose.
[0045] Table 1 Mechanical properties of products obtained using Examples 1 to 6
[0046] Table 2 Comparative performance of titanium alloy plate products with the same purpose
[0047] By metallography Figures 1 to 6 It can be seen that the obtained near-β Ti15Mo titanium alloy plate has a high-magnification structure of a small amount of primary α phase on a β matrix, with fine grains and a size of less than 10μm.
[0048] The test results in Tables 1 and 2 show that the near-β Ti15Mo alloy plate produced by the method of the present invention has a finished product tensile strength Rm ≥ 690 MPa, a yield strength ≥ 480 MPa, an elongation A ≥ 25%, and an HV hardness ≥ 250. While maintaining a certain strength, it has good plasticity and good bending performance, and can stably meet the material use requirements of high plasticity, durability, and bending structural integrity in complex scenarios in fields such as medical and chemical industries.
Claims
1. A method for preparing a near-β state high-plasticity Ti15Mo titanium alloy sheet, characterized in that: The specific steps are as follows: Step 1: Selecting an α+β Ti15Mo slab that meets the requirements; Step 2: The selected α+β Ti15Mo slab is subjected to multiple heat rolling at the phase transition point to obtain a first finished slab with fine structure and straightness ≤3 mm / m; Step 3: heat treating the first finished slab at a temperature below the phase transition point to obtain a near-β Ti15Mo titanium alloy plate; Step 4: removing surface oxide scale from the near-β-state Ti15Mo titanium alloy plate to obtain a second finished plate; Step 5: Cut and cut the second finished plate to obtain a near-β state high-plasticity Ti15Mo titanium alloy plate.
2. The method for preparing the near-β state high plasticity Ti15Mo titanium alloy sheet according to claim 1, characterized in that: The α+β Ti15Mo slab selected in step 1 meets the following conditions: a thickness of 10 to 40 mm, a uniform structure, no cracks or folds visible to the naked eye on the surface after treatment, and no abnormal metallurgical defects after flaw detection.
3. The method for preparing the near-β state high plasticity Ti15Mo titanium alloy sheet according to claim 1, characterized in that: The specific method of step 2 is: The selected α+β Ti15Mo slab is heated for the first time at the phase transition point to obtain a fully heated slab; The fully heated slab is then passed through a plate rolling mill for multiple heat rolling and deformation to obtain the target slab. Finally, the target slab is straightened by the rolling mill using the waste heat to obtain the first finished slab with uniform and fine structure and straightness ≤3mm / m.
4. The method for preparing the near-β state high plasticity Ti15Mo titanium alloy sheet according to claim 3, characterized in that: The temperature of the first heating is 20 to 50° C. below the phase transition point, and the heating time is 1.0 to 4.0 hours.
5. The method for preparing the near-β state high plasticity Ti15Mo titanium alloy sheet according to claim 3, characterized in that: In the multi-pass rolling, the total deformation of a single-pass rolling is ≤80%, the deformation of a single pass is ≤25%, and the deformation of the final pass of the finished product rolling is 5-10%.
6. The method for preparing the near-β state high plasticity Ti15Mo titanium alloy sheet according to claim 1, characterized in that: The specific method of step 3 is: heating the first finished slab for a second time at a temperature below the phase transition point to obtain a fully heat-treated slab; The slab that has been fully heat treated is taken out of the furnace and water-cooled to obtain a near-β Ti15Mo titanium alloy plate with uniform and fine structure and performance that meets the requirements.
7. The method for preparing the near-β state high plasticity Ti15Mo titanium alloy plate according to claim 6, characterized in that: The temperature of the second heating is 5 to 40° C. below the phase transition point temperature, and the time is 20 to 120 minutes. After the heat treatment, the heat treatment is followed by water cooling, and the heat treatment water transfer time is ≤60 seconds.
8. The method for preparing the near-β state high plasticity Ti15Mo titanium alloy plate according to claim 7, characterized in that: In step 4, the near-β Ti15Mo titanium alloy plate is surface-treated by grinding, sanding or planing to obtain a second finished plate with a roughness Ra≤3.2 μm.
9. Near-β Ti15Mo titanium alloy plate, characterized in that: The near-β-state Ti15Mo titanium alloy plate obtained by the preparation method according to any one of claims 1 to 8 has a tensile strength Rm ≥ 690 MPa, a yield strength ≥ 480 MPa, an elongation A ≥ 25%, and an HV hardness ≥ 250.