A method for repairing defects in a titanium / steel composite interface

Abstract

The application discloses a kind of titanium / steel composite material interface defect repair methods, it belongs to metal matrix composite manufacturing technical field.The repair method of the application includes the following steps:S1, titanium / steel composite material is carried out ultrasonic flaw detection, and the defect area of titanium / steel composite material is detected and positioned;S2, after titanium / steel composite material preheating, ultrasonic roll head is moved to the defect area, and the interface defect of titanium / steel composite material is repaired and reinforced by ultrasonic composite.The repair method of the application is combined by ultrasonic detection and ultrasonic composite, first, the defect area of titanium / steel composite material is detected by ultrasonic wave, then the defect area is repaired by ultrasonic composite, and the heterogeneous interface reinforcement of titanium / steel composite material is realized using "heat-power-ultrasonic" coupling, so as to realize the repair of titanium / steel composite material metal defect, and effectively improve the interface bonding rate of titanium / steel composite material.

Description

Technical Field

[0001] This invention relates to the field of metal matrix composite manufacturing technology, and specifically to a method for repairing interface defects in titanium / steel composite materials. Background Technology

[0002] Titanium / steel composites, combining the excellent corrosion resistance of titanium with the good mechanical properties of steel, have been widely used in marine engineering equipment. Subsea data centers, shipbuilding, and seawater pipeline systems typically employ titanium / steel composites to meet demanding operating conditions. For example, in the construction of the ventilation system for the Zhuhai-Macau Bridge's subsea tunnel, titanium / steel composite plates were used as a key material. Utilizing the superior corrosion resistance of these plates, the complex marine environment was effectively resisted, ensuring the ventilation system's stable operation for up to 20 years, fully demonstrating the significant value of titanium / steel composites in marine engineering.

[0003] However, during the preparation of titanium / steel composite materials, interfacial defects such as non-bonding often occur at the interface of the titanium / steel heterogeneous materials. This problem seriously affects the molding quality of the material. Minor interfacial defects can lead to material degradation, while severe defects can render the entire plate unusable. According to GB / T 8547-2019 "Titanium-Steel Composite Plates" standard, ultrasonic testing using the water immersion method is required before the product leaves the factory, and the material quality must be rated based on the interfacial bonding rate. Non-bonding defects at the heterogeneous interface reduce the interfacial bonding rate of the composite material, leading to a lower rating. Simultaneously, the bonding strength in the defective area is significantly weakened, greatly affecting the overall performance of the material and posing a potential threat to its reliable application in practical engineering.

[0004] Currently, the main methods for repairing defects in titanium / steel composite materials are explosive repair and welding repair. Patent CN100400216C discloses a method for repairing defects in titanium-steel composite materials. This method, through pre-cleaning, explosive repair, welding, and grinding, repairs titanium composite materials thicker than 5mm, achieving complete repair after explosive bonding and improving the yield of titanium composite materials. Patent CN113145981A discloses a welding method for repairing damaged titanium-steel composite plates. This method repairs damage to titanium-steel composite plates that occurs during use through intermediate layer welding and welding. However, the above methods involve cumbersome pre-processing, a narrow repair window, are environmentally unfriendly, and struggle to precisely repair specific defects, potentially leading to further human-caused defects and hindering the widespread application of these repair technologies. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the present invention aims to provide a method for repairing interface defects of titanium / steel composite materials, so as to solve the problems of cumbersome work, environmental unfriendliness and difficulty in accurately repairing defects in the existing repair methods.

[0006] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0007] A method for repairing interface defects in titanium / steel composite materials, comprising the following steps:

[0008] S1. Perform ultrasonic testing on titanium / steel composite materials to detect and locate defective areas in the titanium / steel composite materials;

[0009] S2. After preheating the titanium / steel composite material, move the ultrasonic roller to the defect area and repair and reinforce the interface defects of the titanium / steel composite material through ultrasonic composite.

[0010] As can be seen from the above technical solution, the repair method of the present invention combines ultrasonic detection and ultrasonic composite. First, ultrasonic detection is used to detect the defect area of ​​the titanium / steel composite material, and then ultrasonic composite repair is performed on the defect area. The heterogeneous interface of the titanium / steel composite material is reinforced by the "thermal-mechanical-ultrasonic" coupling, thereby achieving the repair of the metal defects of the titanium / steel composite material and effectively improving the interface bonding rate of the titanium / steel composite material.

[0011] In a preferred embodiment of the present invention, the titanium layer thickness of the titanium / steel composite material in step S1 is 0.05-2 mm.

[0012] In a preferred embodiment of the present invention, ultrasonic testing of the titanium / steel composite material is performed using the water immersion method in step S1.

[0013] In a preferred embodiment of the present invention, the preheating temperature in step S2 is 100-200℃ and the preheating time is 5-30min.

[0014] More preferably, the preheating temperature in step S2 is 120-180℃ and the preheating time is 10-25min.

[0015] As a preferred embodiment of the present invention, the conditions for ultrasonic composite in step S2 are as follows: ultrasonic amplitude is 14-28 μm, composite pressure is 1000-3000 N, and composite speed is 20-50 mm / s.

[0016] More preferably, the conditions for ultrasonic composite in step S2 are as follows: ultrasonic amplitude is 18-25 μm, composite pressure is 1500-2500 N, and composite speed is 30-40 mm / s.

[0017] In a preferred embodiment of the present invention, in step S2, the titanium / steel composite material is fixed on the worktable of the ultrasonic composite equipment with the titanium layer facing upwards and then preheated.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] The repair method of this invention combines ultrasonic testing and ultrasonic composite methods. Through "thermal-mechanical-ultrasonic" coupling, the titanium / steel composite material is preheated after flaw detection, increasing its plastic deformation capacity and optimizing the repair effect. Then, ultrasonic composite methods induce high-frequency vibrations at the titanium / steel composite interface, causing interlayer friction and promoting localized plastic deformation and atomic diffusion, thereby repairing the metal defects in the composite material. This invention eliminates the need for grinding or repairing the titanium / steel composite material, allowing direct ultrasonic composite repair of defective areas. It is convenient, environmentally friendly, and does not alter the chemical and physical properties of the titanium / steel composite material, nor does it generate intermetallic compounds during the repair process. This invention is applicable to the repair of defects in titanium / steel composite materials with a titanium layer thickness of 0.05-2 mm, enabling precise detection, location, and repair of defects. After repair, the interfacial bonding rate of the titanium / steel composite material can reach 100%, achieving metallurgical bonding of the heterogeneous interface of the titanium / steel composite material. Attached Figure Description

[0020] Figure 1 This is a flowchart of the method for repairing interface defects in titanium / steel composite materials according to the present invention;

[0021] Figure 2 These are ultrasonic testing results of the titanium / steel composite material before and after repair in Example 1 of this invention. Figure 2 (a) is the result before repair. Figure 2 (b) is the result image after repair;

[0022] Figure 3 These are ultrasonic testing results before and after repair of the titanium / steel composite material in Example 2 of this invention. Figure 3 (a) is the result before repair. Figure 3 (b) is the result image after repair;

[0023] Figure 4 These are ultrasonic testing results before and after repair of the titanium / steel composite material in Example 3 of this invention. Figure 4 (a) is the result before repair. Figure 4 (b) is the result image after repair;

[0024] Figure 5 These are ultrasonic testing results of the titanium / steel composite material before and after repair in Comparative Example 1 of this invention. Figure 5 (a) is the result before repair. Figure 5(b) is the result image after repair. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1 As shown, the method for repairing interface defects in titanium / steel composite materials provided by the present invention includes the following steps:

[0027] S1. Ultrasonic testing of titanium / steel composite materials is performed using the water immersion method to detect and locate defect areas in the titanium / steel composite materials.

[0028] S2. Fix the titanium / steel composite material on the worktable of the ultrasonic composite equipment with the titanium layer facing upward. After preheating the titanium / steel composite material at a temperature of 100-200℃ for 5-30 minutes, move the ultrasonic roller to the defect area. Under the conditions of ultrasonic amplitude of 14-28μm, composite pressure of 1000-3000N, and composite speed of 20-50mm / s, repair and reinforce the interface defects of the titanium / steel composite material through ultrasonic composite.

[0029] The repair method of the present invention is applicable to the repair of defect areas in titanium / steel composite materials with a titanium layer thickness of 0.05-2mm.

[0030] Example 1: A method for repairing interface defects in titanium / steel composite materials, comprising the following steps:

[0031] S1. Ultrasonic testing was performed on a titanium / steel composite material with dimensions of 25mm*50mm and a titanium layer thickness of 0.1mm using the water immersion method. The testing results are as follows: Figure 2 As shown in (a). Figure 2 In (a), the black pixels represent interface defects in the titanium / steel composite material.

[0032] S2. Fix the titanium / steel composite material on the worktable of the ultrasonic composite equipment with the titanium layer facing upwards. Preheat the titanium / steel composite material to 100°C and maintain it for 5 minutes to improve the material's plastic deformation capacity. Move the ultrasonic roller to the defect area of ​​the titanium / steel composite material and repair the defect according to the following ultrasonic composite parameters: ultrasonic amplitude is 18μm, composite pressure is 1800N, and composite speed is 33mm / s.

[0033] S3. Ultrasonic testing was performed on the repaired titanium / steel composite material using the water immersion method. The results are as follows: Figure 2 As shown in (b). Figure 2 (b) The results showed that the interface defects had completely disappeared, indicating that the interface defects of the material were completely repaired and the interface bonding rate of the titanium / steel composite material reached 100%.

[0034] Example 2: A method for repairing interface defects in titanium / steel composite materials, comprising the following steps:

[0035] S1. Ultrasonic testing was performed on a titanium / steel composite material with dimensions of 25mm*70mm and a titanium layer thickness of 0.2mm using the water immersion method. The testing results are as follows: Figure 3 As shown in (a). Figure 3 In (a), the black pixels represent interface defects in the titanium / steel composite material.

[0036] S2. Fix the titanium / steel composite material on the worktable of the ultrasonic composite equipment with the titanium layer facing upwards. Preheat the titanium / steel composite material to 150°C and maintain it for 5 minutes to improve the material's plastic deformation capacity. Move the ultrasonic roller to the defect area of ​​the titanium / steel composite material and repair the defect according to the following ultrasonic composite parameters: ultrasonic amplitude is 18μm, composite pressure is 1600N, and composite speed is 35mm / s.

[0037] S3. Ultrasonic testing was performed on the repaired titanium / steel composite material using the water immersion method. The results are as follows: Figure 3 As shown in (b). Figure 3 (b) The results showed that the interface defects had completely disappeared, indicating that the interface defects of the material were completely repaired and the interface bonding rate of the titanium / steel composite material reached 100%.

[0038] Example 3: A method for repairing interface defects in titanium / steel composite materials, comprising the following steps:

[0039] S1. Ultrasonic testing was performed on a titanium / steel composite material with dimensions of 25mm*50mm and a titanium layer thickness of 1mm using the water immersion method. The testing results are as follows: Figure 4 As shown in (a). Figure 4 In (a), the black pixels represent interface defects in the titanium / steel composite material.

[0040] S2. Fix the titanium / steel composite material on the worktable of the ultrasonic composite equipment with the titanium layer facing upwards. Preheat the titanium / steel composite material to 200℃ and maintain it for 10 minutes to improve the material's plastic deformation capacity. Move the ultrasonic roller to the defect area of ​​the titanium / steel composite material and repair the defect according to the following ultrasonic composite parameters: ultrasonic amplitude is 20μm, composite pressure is 2200N, and composite speed is 32mm / s.

[0041] S3. Ultrasonic testing was performed on the repaired titanium / steel composite material using the water immersion method. The results are as follows: Figure 4 As shown in (b). Figure 4 (b) The results showed that the interface defects had completely disappeared, indicating that the interface defects of the material were completely repaired and the interface bonding rate of the titanium / steel composite material reached 100%.

[0042] Comparative Example 1: A method for repairing interface defects in titanium / steel composite materials, comprising the following steps:

[0043] S1. Ultrasonic testing was performed on a titanium / steel composite material with dimensions of 25mm*50mm and a titanium layer thickness of 0.1mm using the water immersion method. The testing results are as follows: Figure 5 As shown in (a). Figure 5 In (a), the black pixels represent interface defects in the titanium / steel composite material.

[0044] S2. Fix the titanium / steel composite material on the worktable of the ultrasonic composite equipment with the titanium layer facing upwards. Move the ultrasonic roller to the defect area of ​​the titanium / steel composite material and repair the defect according to the following ultrasonic composite parameters: ultrasonic amplitude is 18μm, composite pressure is 1800N, and composite speed is 33mm / s.

[0045] S3. Ultrasonic testing was performed on the repaired titanium / steel composite material using the water immersion method. The results are as follows: Figure 5 As shown in (b). Figure 5 (b) The results showed that most of the interface defects had disappeared, indicating that most of the interface defects of the material had been repaired, but there were still unbonded areas at the interface. The interface bonding rate of the titanium / steel composite material was 79%.

[0046] By comparing Example 1 and Comparative Example 1, it can be seen that the present invention, by preheating the titanium / steel composite material first and then performing ultrasonic composite repair on the defect area of ​​the titanium / steel composite material, can increase the plastic deformation capacity of the material, which is conducive to optimizing the repair effect. After ultrasonic composite repair, the interface bonding rate of the titanium / steel composite material can reach 100%.

[0047] The above embodiments are only some specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any non-substantial changes and substitutions made by those skilled in the art within the technical scope disclosed in the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for repairing interface defects in titanium / steel composite materials, characterized in that: Includes the following steps: S1. Perform ultrasonic testing on the titanium / steel composite material to detect and locate defective areas; the titanium layer thickness in the titanium / steel composite material is 0.05-2mm. S2. Preheat the titanium / steel composite material at a temperature of 100-200℃ for 5-30 minutes. Then, move the ultrasonic roller to the defect area and repair and reinforce the interface defects of the titanium / steel composite material through ultrasonic composite.

2. The method for repairing interface defects in titanium / steel composite materials according to claim 1, characterized in that: In step S1, ultrasonic testing of titanium / steel composite materials is performed using the water immersion method.

3. The method for repairing interface defects in titanium / steel composite materials according to claim 1, characterized in that: The preheating temperature in step S2 is 120-180℃ and the preheating time is 10-25min.

4. The method for repairing interface defects in titanium / steel composite materials according to claim 1, characterized in that: The conditions for ultrasonic composite in step S2 are as follows: ultrasonic amplitude is 14-28 μm, composite pressure is 1000-3000 N, and composite speed is 20-50 mm / s.

5. The method for repairing interface defects in titanium / steel composite materials according to claim 1 or 4, characterized in that: The conditions for ultrasonic composite in step S2 are as follows: ultrasonic amplitude is 18-25 μm, composite pressure is 1500-2500 N, and composite speed is 30-40 mm / s.

6. The method for repairing interface defects in titanium / steel composite materials according to claim 1, characterized in that: In step S2, the titanium / steel composite material is fixed on the worktable of the ultrasonic composite equipment with the titanium layer facing upwards and then preheated.

Images