Method for repairing interface defects of titanium / steel composite material

Abstract

The invention discloses a method for repairing interface defects of a titanium / steel composite material, and belongs to the technical field of metal matrix composite material manufacturing. The repairing method comprises the following steps: S1, carrying out ultrasonic flaw detection on the titanium / steel composite material, and detecting and positioning a defect area of the titanium / steel composite material; and S2, after the titanium / steel composite material is preheated, the ultrasonic rolling head is moved to a defect area, and the interface defects of the titanium / steel composite material are repaired and reinforced through ultrasonic compounding. According to the repairing method, ultrasonic detection and ultrasonic compounding are combined, the defect area of the titanium / steel composite material is detected through ultrasonic waves firstly, then ultrasonic compounding repairing is conducted on the defect area, heterogeneous interface reinforcement of the titanium / steel composite material is achieved through heat-force-ultrasonic coupling, and therefore repairing of the metal defects of the titanium / steel composite material is achieved. And the interface bonding rate of the titanium / steel composite material is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of manufacturing metal matrix composites, and particularly relates to a method for repairing interface defects of titanium / steel composites. Background Art

[0002] Titanium / steel composites have been widely used in the field of marine engineering equipment due to their excellent corrosion resistance of titanium and good mechanical properties of steel. Subsea data centers, shipbuilding, and seawater pipeline systems generally use titanium / steel composites to meet the demanding working conditions. For example, in the construction of the ventilation system of the undersea tunnel of the Hong Kong-Zhuhai-Macao Bridge, titanium / steel composite plates were used as key materials. Utilizing the excellent corrosion resistance of the titanium / steel composite plates, the complex marine environment was effectively resisted, ensuring the stable operation of the ventilation system for up to 20 years, and fully demonstrating the important value of titanium / steel composites in marine engineering.

[0003] However, during the preparation process of titanium / steel composite materials, interface defects of non-bonding often occur at the interface of titanium / steel heterogeneous materials. This problem seriously affects the forming quality of the materials. Minor interface defects result in the downgraded use of the materials, and in severe cases, the entire plate is scrapped. According to the standard of GB / T 8547-2019 "Titanium-steel composite plates", ultrasonic flaw detection using the immersion method is required before the products leave the factory, and the materials are rated according to the interface bonding rate. The non-bonding defects at the heterogeneous interface will cause the interface bonding rate of the composite material to decrease, thereby leading to a lower rating. At the same time, the bonding strength in the defect area is significantly weakened, greatly affecting the comprehensive performance of the materials and posing a potential threat to their reliable application in actual engineering.

[0004] Currently, explosion repair method and welding repair method are mainly used for defects of titanium / steel composites. The invention patent with the publication number of CN100400216C provides a method for repairing defects of titanium-steel composites. This method repairs titanium-based composites with a thickness of more than 5 mm through processes such as pre-cleaning, re-explosion, surfacing, and grinding, completely repairing the titanium-steel composites after explosion bonding and improving the yield rate of titanium-based composites. The invention patent with the publication number of CN 113145981A provides a welding method for repairing damaged titanium-steel composite plates. This method repairs the damaged conditions that occur during the use of titanium-steel composite plates through the way of intermediate layer welding + surfacing. However, the above methods have cumbersome preliminary preparation work for the repair manufacturing technology, narrow repair process windows, are not environmentally friendly, and it is difficult to accurately repair defects specifically, and may further cause artificial defects, which is not conducive to the further popularization and application of these repair technologies. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a method for repairing interface defects of titanium / steel composites, so as to solve the problems of cumbersome work, environmental unfriendliness, and difficulty in precisely repairing defects specifically in existing repair methods.

[0006] To solve the above problems, the technical solutions adopted by the present invention are as follows: A method for repairing interface defects of titanium / steel composites, which includes the following steps: S1. Perform ultrasonic flaw detection on the titanium / steel composite material to detect and locate the defect area of the titanium / steel composite material; S2. After preheating the titanium / steel composite material, move the ultrasonic roller head to the defect area, and repair and reinforce the interface defect of the titanium / steel composite material through ultrasonic compounding.

[0007] It can be seen from the above technical solutions that the repair method of the present invention combines ultrasonic detection and ultrasonic compounding. First, ultrasonic waves are used to detect the defect area of the titanium / steel composite material, and then ultrasonic compounding repair is performed on the defect area. The heterogeneous interface of the titanium / steel composite material is strengthened by using the "thermal - mechanical - ultrasonic" coupling, so as to realize the repair of metal defects in the titanium / steel composite material, thereby effectively improving the interface bonding rate of the titanium / steel composite material.

[0008] As a preferred embodiment of the present invention, the thickness of the titanium layer of the titanium / steel composite material in step S1 is 0.05 - 2 mm.

[0009] As a preferred embodiment of the present invention, the water immersion method is used to perform ultrasonic flaw detection on the titanium / steel composite material in step S1.

[0010] As a preferred embodiment of the present invention, the preheating temperature in step S2 is 100 - 200 °C, and the preheating time is 5 - 30 min.

[0011] Further preferably, the preheating temperature in step S2 is 120 - 180 °C, and the preheating time is 10 - 25 min.

[0012] As a preferred embodiment of the present invention, the conditions for ultrasonic compounding in step S2 are as follows: the ultrasonic amplitude is 14 - 28 μm, the compounding pressure is 1000 - 3000 N, and the compounding speed is 20 - 50 mm / s.

[0013] Further preferably, the conditions for ultrasonic compounding in step S2 are as follows: the ultrasonic amplitude is 18 - 25 μm, the compounding pressure is 1500 - 2500 N, and the compounding speed is 30 - 40 mm / s.

[0014] As a preferred embodiment of the present invention, in step S2, the titanium / steel composite material is fixed on the workbench of the ultrasonic composite equipment with the titanium layer facing upward and then preheated.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The repair method of the present invention combines ultrasonic detection and ultrasonic compounding. Through the coupling of "heat - force - ultrasound", after flaw detection, the titanium / steel composite material is preheated, which can increase the plastic deformation ability of the material and is beneficial to optimizing the repair effect. Then, through ultrasonic compounding, high-frequency vibration is generated at the interface of the titanium / steel composite material, so that interlayer friction is generated at the metal interface, prompting local plastic deformation and atomic diffusion, thereby realizing the repair of metal defects in the composite material. The present invention does not need to grind or recompress the titanium / steel composite material, etc., and can directly perform ultrasonic composite repair on the defective area of the material. The operation is convenient, environmentally friendly, and does not change the chemical and physical properties of the titanium / steel composite material, and no intermetallic compound is generated during the repair process. The present invention is applicable to the defect repair of titanium / steel composite materials with a titanium layer thickness of 0.05 - 2 mm, can accurately detect and locate the defects targeted, and the interface bonding rate of the titanium / steel composite material after repair can reach 100%, realizing the metallurgical bonding of the heterogeneous interface of the titanium / steel composite material. Description of the Drawings

[0016] Figure 1 is a flowchart of the method for repairing the interface defect of the titanium / steel composite material described in the present invention; Figure 2 is the ultrasonic flaw detection result diagram of the titanium / steel composite material before and after repair in Example 1 of the present invention, Figure 2 (a) is the result diagram before repair, Figure 2 (b) is the result diagram after repair; Figure 3 is the ultrasonic flaw detection result diagram of the titanium / steel composite material before and after repair in Example 2 of the present invention, Figure 3 (a) is the result diagram before repair, Figure 3 (b) is the result diagram after repair; Figure 4 is the ultrasonic flaw detection result diagram of the titanium / steel composite material before and after repair in Example 3 of the present invention, Figure 4 (a) is the result diagram before repair, Figure 4 (b) is the result diagram after repair; Figure 5 is the ultrasonic flaw detection result diagram of the titanium / steel composite material before and after repair in Comparative Example 1 of the present invention, Figure 5 (a) is the result diagram before repair, Figure 5 (b) is the result diagram after repair. Detailed Embodiments

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] As Figure 1 shown, the method for repairing the interface defect of the titanium / steel composite material provided by the present invention includes the following steps: S1. Use the immersion method to perform ultrasonic flaw detection on the titanium / steel composite material, and detect and locate the defect area of the titanium / steel composite material; S2. Fix the titanium / steel composite material on the workbench of the ultrasonic composite equipment, with the titanium layer facing upward. After preheating the titanium / steel composite material at a temperature of 100 - 200 °C for 5 - 30 min, move the ultrasonic roller head to the defect area, and repair and strengthen the interface defect of the titanium / steel composite material through ultrasonic compounding under the conditions of an ultrasonic amplitude of 14 - 28 μm, a compound pressure of 1000 - 3000 N, and a compound speed of 20 - 50 mm / s.

[0019] The repair method of the present invention is applicable to the repair of the defect area of the titanium / steel composite material with a titanium layer thickness of 0.05 - 2 mm.

[0020] Example 1: A method for repairing the interface defect of a titanium / steel composite material, including the following steps: S1. Use the immersion method to perform ultrasonic flaw detection on a titanium / steel composite material with dimensions of 25 mm * 50 mm and a titanium layer thickness of 0.1 mm. The flaw detection result is as Figure 2 (a) shown, Figure 2 The black pixel points in (a) are the interface defects of the titanium / steel composite material.

[0021] S2. Fix the titanium / steel composite material on the workbench of the ultrasonic composite equipment, with the titanium layer facing upward. Preheat the titanium / steel composite material to 100 °C and keep it for 5 min to improve the plastic deformation ability of the material; move the ultrasonic roller head to the defect area of the titanium / steel composite material, and perform defect repair according to the following ultrasonic compounding parameters: ultrasonic amplitude is 18 μm, compound pressure is 1800 N, and compound speed is 33 mm / s.

[0022] S3. Use the immersion method to perform ultrasonic flaw detection on the repaired titanium / steel composite material, and the result is as Figure 2 (b) shown. Figure 2 The result of (b) shows that the interface defect has completely disappeared, indicating that the interface defect of the material has been completely repaired, and the interface bonding rate of the titanium / steel composite material reaches 100%.

[0023] Example 2: A method for repairing the interface defect of a titanium / steel composite material, including the following steps: S1. Use the immersion method to perform ultrasonic flaw detection on a titanium / steel composite material with dimensions of 25 mm * 70 mm and a titanium layer thickness of 0.2 mm. The flaw detection result is asFigure 3 As shown in (a), Figure 3 The black pixel points in (a) are the interface defects of the titanium / steel composite material.

[0024] S2. Fix the titanium / steel composite material on the workbench of the ultrasonic composite equipment, with the titanium layer facing up. Preheat the titanium / steel composite material to 150 °C and keep it for 5 min to improve the plastic deformation ability of the material. Move the ultrasonic roller head to the defect area of the titanium / steel composite material and perform defect repair according to the following ultrasonic composite parameters: ultrasonic amplitude is 18 μm, composite pressure is 1600 N, and composite speed is 35 mm / s.

[0025] S3. Use the immersion method to perform ultrasonic flaw detection on the repaired titanium / steel composite material. The results are as Figure 3 shown in (b). Figure 3 The results in (b) show that the interface defects have completely disappeared, indicating that the interface defects of the material have been completely repaired, and the interface bonding rate of the titanium / steel composite material reaches 100%.

[0026] Example 3: A method for repairing interface defects of a titanium / steel composite material, comprising the following steps: S1. Use the immersion method to perform ultrasonic flaw detection on a titanium / steel composite material with dimensions of 25 mm × 50 mm and a titanium layer thickness of 1 mm. The flaw detection results are as Figure 4 shown in (a), Figure 4 The black pixel points in (a) are the interface defects of the titanium / steel composite material.

[0027] S2. Fix the titanium / steel composite material on the workbench of the ultrasonic composite equipment, with the titanium layer facing up. Preheat the titanium / steel composite material to 200 °C and keep it for 10 min to improve the plastic deformation ability of the material. Move the ultrasonic roller head to the defect area of the titanium / steel composite material and perform defect repair according to the following ultrasonic composite parameters: ultrasonic amplitude is 20 μm, composite pressure is 2200 N, and composite speed is 32 mm / s.

[0028] S3. Use the immersion method to perform ultrasonic flaw detection on the repaired titanium / steel composite material. The results are as Figure 4 shown in (b). Figure 4 The results in (b) show that the interface defects have completely disappeared, indicating that the interface defects of the material have been completely repaired, and the interface bonding rate of the titanium / steel composite material reaches 100%.

[0029] Comparative Example 1: A method for repairing interface defects of a titanium / steel composite material, comprising the following steps: S1. Use the immersion method to perform ultrasonic flaw detection on a titanium / steel composite material with dimensions of 25 mm × 50 mm and a titanium layer thickness of 0.1 mm. The flaw detection results are as Figure 5 shown in (a),Figure 5 The black pixel points in (a) are the interface defects of the titanium / steel composite material.

[0030] S2. Fix the titanium / steel composite material on the workbench of the ultrasonic composite equipment with the titanium layer facing upward. Move the ultrasonic roller head to the defect area of the titanium / steel composite material and perform defect repair according to the following ultrasonic composite parameters: ultrasonic amplitude is 18 μm, composite pressure is 1800 N, and composite speed is 33 mm / s.

[0031] S3. Use the immersion method to perform ultrasonic flaw detection on the repaired titanium / steel composite material, and the result is as Figure 5 shown in (b). Figure 5 The result in (b) shows that most of the interface defects have disappeared, indicating that most of the interface defects of the material have been repaired. However, there are still areas where the interfaces do not bond. The interface bonding rate of the titanium / steel composite material is 79%.

[0032] By comparing Example 1 with Comparative Example 1, it can be seen that by preheating the titanium / steel composite material first and then performing ultrasonic composite repair on the defect area of the titanium / steel composite material, the plastic deformation ability of the material can be increased, which is beneficial to optimizing the repair effect. After ultrasonic composite repair of the titanium / steel composite material, the interface bonding rate of the material can reach 100%.

[0033] The above embodiments are only some specific implementation manners of the present invention, but the protection scope of the present invention is not limited thereto. Any non-substantive changes and substitutions made by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for repairing interface defects of a titanium / steel composite material, characterized in that: It includes the following steps: S1. Perform ultrasonic flaw detection on the titanium / steel composite material, and detect and locate the defective area of the titanium / steel composite material; S2. After preheating the titanium / steel composite material, move the ultrasonic roller head to the defective area, and repair and strengthen the interfacial defects of the titanium / steel composite material through ultrasonic compounding.

2. The method for repairing the interface defect of the titanium / steel composite material according to claim 1, wherein: In step S1, the thickness of the titanium layer of the titanium / steel composite material is 0.05 - 2 mm.

3. The method for repairing the interface defect of the titanium / steel composite material according to claim 1, characterized in that: In step S1, the water immersion method is used to perform ultrasonic flaw detection on the titanium / steel composite material.

4. The method for repairing the interface defect of the titanium / steel composite material according to claim 1, characterized in that: In step S2, the preheating temperature of the preheating is 100 - 200 °C, and the preheating time is 5 - 30 min.

5. The method for repairing the interface defect of the titanium / steel composite material according to claim 1 or 4, characterized in that: In step S2, the preheating temperature of the preheating is 120 - 180 °C, and the preheating time is 10 - 25 min.

6. The method for repairing the interface defect of the titanium / steel composite material according to claim 1, wherein: The conditions of the ultrasonic compounding in step S2 are as follows: the ultrasonic amplitude is 14 - 28 μm, the compounding pressure is 1000 - 3000 N, and the compounding speed is 20 - 50 mm / s.

7. The method for repairing the interface defect of the titanium / steel composite material according to claim 1 or 6, characterized in that: The conditions of the ultrasonic compounding in step S2 are as follows: the ultrasonic amplitude is 18 - 25 μm, the compounding pressure is 1500 - 2500 N, and the compounding speed is 30 - 40 mm / s.

8. The method for repairing the interface defect of the titanium / steel composite material according to claim 1, characterized in that: In step S2, the titanium / steel composite material is fixed on the workbench of the ultrasonic compounding equipment with the titanium layer facing up and then preheated.

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