A remanufacturing and repairing method for in-situ generation of high-entropy effect by synergistic action of multiple laser beams

Abstract

This invention provides a remanufacturing repair method that utilizes the synergistic effect of multiple laser beams to generate a high-entropy effect in situ. When repairing the surface of a damaged TiAl alloy blade, laser A is first used to preheat the TiAl alloy along the repair direction, melting it to form a molten pool D rich in Ti and Al elements. Next, laser B is used to heat and melt a mixed powder of Mo, Nb, and Ta delivered by a laser cladding head, forming a molten pool E rich in Mo, Nb, and Ta elements. As laser B advances along the repair direction, molten pools D and E merge to form a molten pool F rich in Mo, Nb, Ta, Ti, and Al elements. Then, laser C is used to helically oscillate along a preset path to heat molten pool F and achieve a stirring effect, ensuring a uniform distribution of the five elements (Mo, Nb, Ta, Ti, and Al) within the molten pool, thereby enhancing the high-entropy effect after element mixing. Finally, after molten pool F cools, a MoNbTaTiAl high-entropy alloy coating is formed on the TiAl alloy surface. This method achieves high-quality repair of TiAl alloy blade surfaces by generating a high-entropy effect in situ through the interaction of added and base elements.

Description

Technical Field

[0001] This invention belongs to the field of remanufacturing and repair technology, and discloses a remanufacturing and repair method that uses the synergistic effect of multiple laser beams to generate a high-entropy effect in situ. Background Technology

[0002] TiAl alloy is a metallic compound structural material with many outstanding characteristics, such as low density, high specific strength and high specific elastic modulus. It maintains sufficient strength and stiffness at high temperatures, and also possesses good creep resistance and oxidation resistance, making it widely used in aircraft engine manufacturing. TiAl alloy blades can reduce weight while maintaining sufficient strength and resistance to high-temperature corrosion. However, during the service life of aero engines, blades are prone to wear. TiAl alloy blades are subjected to the impact of high-temperature exhaust gases during operation, and prolonged erosion leads to the gradual loss of surface material. Furthermore, fine particulate matter in the air intake of the engine, carried by the high-speed airflow, corrodes the blade surface, causing wear. Corrosive substances in the high-temperature exhaust gases cause chemical corrosion of the blade material; this corrosion weakens the surface strength of the blade and accelerates the wear process.

[0003] Compared to manufacturing new blades, remanufacturing and repairing blades is less costly. This not only reduces airline operating costs but also alleviates the demand for raw materials. On the one hand, remanufacturing and repair technology can extend the service life of blades and reduce the frequency of replacements due to damage, thereby improving the reliability and economy of aircraft engines. On the other hand, remanufacturing and repair technology can shorten blade maintenance cycles, quickly respond to aircraft maintenance needs, reduce aircraft downtime, and improve airline operational efficiency.

[0004] Therefore, there is an urgent need to develop an efficient and high-quality remanufacturing repair method for TiAl alloy blades. This paper discloses a remanufacturing repair method that utilizes the synergistic effect of multiple laser beams to generate a high-entropy effect in situ. The high-entropy effect generated by this method can improve the strength and hardness of the repair layer, which is crucial for key components such as alloy blades. The in-situ reaction reduces the need for post-processing and allows for the more direct formation of the required high-entropy alloy coating on the blade surface, simplifying the manufacturing process. Through in-situ reaction, a good metallurgical bond can be achieved between the coating and the substrate, avoiding the risk of coating peeling and improving the reliability of the repair. This method embodies technological innovation in the fields of materials science and surface engineering, providing a new approach for the repair of key components such as alloy blades. Summary of the Invention

[0005] The purpose of this invention is to provide a remanufacturing repair method that can extend the service life of TiAl alloy blades and improve their surface properties. The main method involves: utilizing the in-situ high-entropy reaction between Nb, Mo, and Ta elements in the repair powder raw material and Ti and Al elements in the TiAl alloy blade to form a high-entropy NbMoTaTiAl alloy coating. Three laser beams are used for repair according to a predetermined process route, ensuring a uniform distribution of the five elements (Mo, Nb, Ta, Ti, and Al) in the molten pool, thereby enhancing the high-entropy effect after element mixing.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A remanufacturing repair method utilizing the synergistic effect of multiple laser beams to generate a high-entropy effect in situ is disclosed. This method is designed for remanufacturing and repairing TiAl alloy blades after surface wear. First, laser A preheats the TiAl alloy substrate along the repair direction, melting it to form a molten pool D rich in Ti and Al elements. Next, laser B heats and melts a mixed powder of Mo, Nb, and Ta delivered by a laser cladding head, forming a molten pool E rich in Mo, Nb, and Ta elements. As laser B advances along the repair direction, molten pools D and E merge to form a molten pool F rich in Mo, Nb, Ta, Ti, and Al elements. Next, laser C oscillates along a predetermined path, heating the molten pool F. The oscillation of laser C stirs the molten pool F, ensuring a uniform distribution of the five elements (Mo, Nb, Ta, Ti, and Al) and enhancing the high-entropy effect after element mixing. Finally, after the molten pool F cools, a MoNbTaTiAl high-entropy alloy coating is formed on the surface of the TiAl alloy substrate. This method utilizes the in-situ high-entropy effect generated by the addition of external elements and the matrix elements to achieve high-quality repair of TiAl alloy blade surfaces, effectively extending their service life.

[0008] As a preferred option, the specific steps include the following:

[0009] Step 1: Laser A preheats the TiAl alloy substrate along the repair direction, melting it to form a molten pool D rich in Ti and Al elements;

[0010] Step 2: Laser B heats and melts the mixed Mo, Nb, and Ta powder delivered by the laser cladding head, forming a molten pool E rich in Mo, Nb, and Ta elements;

[0011] Step 3: As laser B advances along the repair direction, molten pool D merges with molten pool E to form molten pool F rich in Mo, Nb, Ta, Ti, and Al elements;

[0012] Step 4: Laser C oscillates along a preset oscillation path and heats the molten pool F rich in Mo, Nb, Ta, Ti, and Al elements, so that the five elements Mo, Nb, Ta, Ti, and Al are evenly distributed in the molten pool F, enhancing the high entropy effect after element mixing.

[0013] Step 5: After the molten pool F cools, a MoNbTaTiAl high-entropy alloy coating is formed on the surface of the TiAl alloy substrate.

[0014] The beneficial effects of this invention lie in providing a remanufacturing and repair method that utilizes the synergistic effect of multiple laser beams to generate a high-entropy effect in situ. Through the above steps, high-quality repair of the TiAl alloy blade surface is achieved. The coating not only possesses excellent surface properties but also forms a strong bond with the substrate material. The in-situ reaction reduces the need for post-processing and allows for the more direct formation of the desired high-entropy alloy coating on the blade surface, simplifying the manufacturing process. The high-entropy alloy coating effectively extends the service life of the TiAl alloy blade, reduces the frequency of maintenance and replacement, and improves engine operating efficiency and economy. This invention's method is an innovative surface engineering technology with high practicality and industrial application potential, and is expected to become a new standard in the field of aerospace alloy blade repair. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a device provided in a specific embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of an axial device provided in a specific embodiment of the present invention;

[0017] Figure 3 This is the invention Figure 2 A cross-sectional view along the AA direction;

[0018] Figure 4 This is a schematic diagram of a partial device provided in a specific embodiment of the present invention;

[0019] Figure 5 This is a schematic diagram of the projection of the focal spot of three laser beams onto the surface of a TiAl substrate, provided in a specific embodiment of the present invention.

[0020] Figure 6 This is a schematic diagram of the remanufacturing and repair method provided in a specific embodiment of the present invention;

[0021] In the picture:

[0022] Laser A (1), Laser B (2), Laser C (3), Laser cladding head (4), TiAl alloy substrate (5), MoNbTaTiAl high-entropy alloy coating (6), Repair forward direction (7), Mo, Nb, Ta mixed powder (8), Molten pool D rich in Ti and Al elements (9), Molten pool E rich in Mo, Nb, Ta elements (10), Molten pool F rich in Mo, Nb, Ta, Ti, Al elements (11), Swinging path (12). Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention and not the entire structure.

[0024] This invention provides a remanufacturing repair method that uses the synergistic effect of multiple laser beams to generate a high entropy effect in situ. The method is characterized by including laser A (1), laser B (2), laser C (3), laser cladding head (4), TiAl alloy substrate (5), MoNbTaTiAl high entropy alloy coating (6), repair forward direction (7), mixed powder of Mo, Nb, and Ta (8), molten pool D rich in Ti and Al elements (9), molten pool E rich in Mo, Nb, and Ta elements (10), molten pool F rich in Mo, Nb, Ta, Ti, and Al elements (11), and oscillation path (12).

[0025] Specifically, such as Figure 1 , Figure 2 , Figure 3 As shown, laser A (1) preheats the TiAl alloy substrate (5) along the repair direction (7), melting it to form a molten pool D (9) rich in Ti and Al elements. Laser B (2) heats and melts the Mo, Nb, and Ta mixed powder (8) delivered by the laser cladding head (4), forming a molten pool E (10) rich in Mo, Nb, and Ta elements. As laser B (2) advances along the repair direction, the molten pool D (9) rich in Ti and Al elements merges with the molten pool E (10) rich in Mo, Nb, and Ta elements to form a molten pool F (11) rich in Mo, Nb, Ta, Ti, and Al elements. Laser C (3) oscillates along a preset oscillation path (12) and heats the molten pool F (11) rich in Mo, Nb, Ta, Ti, and Al elements. The oscillation action of laser C (3) stirs the molten pool F (11), making the five elements Mo, Nb, Ta, Ti, and Al evenly distributed in the molten pool, so as to achieve the high entropy effect after the element mixing is enhanced. After the molten pool F (11) rich in Mo, Nb, Ta, Ti and Al elements is cooled, a MoNbTaTiAl high-entropy alloy coating (6) is formed on the surface of the TiAl alloy substrate (5).

[0026] Specifically, such as Figure 4 As shown, with the repair direction as the reference positive direction, laser A(1) is at the forefront of the repair direction, laser B(2) is behind laser A(1), and laser C(3) is behind laser B(2). The three lasers use the same scanning speed. The process parameters of the three lasers are adjusted to ensure that laser A(1) emits light first, laser B(2) emits light after a delay of 0.5 seconds, and laser C(3) emits light after a delay of 1 second. In particular, laser C(3) oscillates according to a preset oscillation path (12).

[0027] Specifically, such as Figure 5 As shown, the focal spots of lasers A(1), B(2), and C(3) are projected onto the surface of the TiAl alloy substrate. The positional relationship of the focal spots of these three lasers is tangent.

[0028] Specifically, such as Figure 6 The diagram illustrates a detailed implementation flow of a remanufacturing and repair method that utilizes the synergistic effect of multiple laser beams to generate a high-entropy effect in situ. This flow chart facilitates understanding of the specific implementation steps of the invention. Specifically, lasers A (1), B (2), and C (3) are emitted by the first laser, the second laser, and the third laser, respectively.

[0029] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A remanufacturing and repair method for in-situ generation of high-entropy effect through the synergistic effect of multiple laser beams, characterized in that, Includes: laser A (1), laser B (2), laser C (3), laser cladding head (4), TiAl alloy substrate (5), MoNbTaTiAl high-entropy alloy coating (6), repair forward direction (7), Mo, Nb, Ta mixed powder (8), molten pool D rich in Ti and Al elements (9), molten pool E rich in Mo, Nb, Ta elements (10), molten pool F rich in Mo, Nb, Ta, Ti, Al elements (11), and oscillation path (12); laser A (1), laser B (2), and laser C (3) use the same scanning speed, and the process parameters of the three lasers are adjusted to ensure that laser A emits light first, laser B emits light after a delay of 0.5 seconds, and laser C emits light after a delay of 1 second; the laser cladding head (4) conveys Mo, Nb, Ta mixed powder (8); the TiAl alloy substrate (5) is the part to be repaired; the MoNbTaTiAl high-entropy alloy coating (6) is a TiAl alloy substrate. The cladding layer after repair of the iAl alloy substrate; the Mo, Nb, Ta mixed powder (8) is a spherical mixed powder of Mo, Nb, and Ta with a particle size of 50-55μm and an equal mass ratio; the Ti and Al rich molten pool D (9) is a molten pool rich in Ti and Al formed by the laser A (1) preheating the TiAl alloy substrate (5) along the repair advancing direction (7); the Mo, Nb, Ta rich molten pool E (10) is a molten pool rich in Mo, Nb, and Ta formed by the laser B (2) heating and melting the Mo, Nb, and Ta mixed powder (8) sent out by the laser cladding head (4); the Mo, Nb, Ta, Ti, and Al rich molten pool F (11) is a molten pool formed by merging the Ti and Al rich molten pool D (9) and the Mo, Nb, and Ta rich molten pool E (10); the oscillation path (12) is the oscillation path of the laser C (3) according to the spiral.

2. The remanufacturing and repair method for in-situ generation of high-entropy effect by multi-laser beam synergy as described in claim 1, characterized in that, Includes the following steps: Step 1: Laser A (1) preheats the TiAl alloy substrate (5) along the repair direction (7) to melt it and form a molten pool D (9) rich in Ti and Al elements; Step 2: Laser B (2) heats and melts the mixed powder of Mo, Nb and Ta delivered by the laser cladding head (4) (8) to form a molten pool E (10) rich in Mo, Nb and Ta elements; Step 3: As laser B(2) moves along the repair direction, the molten pool D(9) rich in Ti and Al elements merges with the molten pool E(10) rich in Mo, Nb and Ta elements to form a molten pool F(11) rich in Mo, Nb, Ta, Ti and Al elements. Step 4: Laser C(3) oscillates along the preset oscillation path (12) and heats the molten pool F(11) rich in Mo, Nb, Ta, Ti and Al elements, so that the five elements Mo, Nb, Ta, Ti and Al are evenly distributed in the molten pool, enhancing the high entropy effect after element mixing. Step 5: After the molten pool F (11) cools, a MoNbTaTiAl high-entropy alloy coating (6) is formed on the surface of the TiAl alloy substrate (5).

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