Remanufacturing repair method for generating high-entropy effect in situ through synergistic effect of multiple laser beams

Abstract

The invention provides a remanufacturing repair method for generating a high-entropy effect in situ under the synergistic effect of multiple laser beams. When the surface of the damaged TiAl alloy blade is repaired, firstly, a first laser beam A is used for preheating a TiAl alloy in the repairing advancing direction, so that the TiAl alloy is molten to form a molten pool D rich in Ti and Al elements; secondly, a second beam of laser B is used for heating and melting Mo, Nb and Ta mixed powder sent out by the laser cladding head, and a molten pool E rich in Mo, Nb and Ta elements is formed; and along with advancing of the laser B in the repairing direction, the molten pool D and the molten pool E are combined to form a molten pool F rich in Mo, Nb, Ta, Ti and Al elements. And then a third beam of laser C is used for making a spiral line according to a preset route to swing and heat the molten pool F, and the stirring effect is achieved, so that the five elements of Mo, Nb, Ta, Ti and Al are evenly distributed in the molten pool, and the high-entropy effect after element mixing is enhanced. And finally, after the molten pool F is cooled, the MoNbTaTiAl high-entropy alloy coating is formed on the surface of the TiAl alloy. According to the method, the high-entropy effect is generated in situ through the additional elements and the matrix elements, and high-quality repairing of the surface of the TiAl alloy blade can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of remanufacturing and repairing, and discloses a remanufacturing and repairing method for generating a high entropy effect in situ by synergistic action of multiple laser beams. Background Art

[0002] TiAl alloy is a metal compound structural material with many outstanding features, such as low density, high specific strength and high specific elastic modulus. It can still maintain sufficiently high strength and rigidity at high temperatures. At the same time, it also has good creep resistance and oxidation resistance, etc., and is widely used in the manufacture of aircraft engines. TiAl alloy blades can reduce weight while having sufficient strength and resistance to high-temperature corrosion. However, during the service of aircraft engines, blades are prone to wear. TiAl alloy blades are impacted by high-temperature combustion gases during operation, and long-term scouring will cause gradual loss of blade surface material. In addition, the tiny particles contained in the air inhaled by the engine, driven by high-speed airflow, will corrode the blade surface and cause wear. The corrosive substances in the high-temperature combustion gases will cause chemical erosion of the blade material, and this corrosion will weaken the surface strength of the blade and accelerate the wear process.

[0003] Compared with manufacturing new blades, the economic cost of remanufacturing and repairing blades is low. This not only reduces the operating costs of airlines, but also reduces the demand for raw materials. On the one hand, through remanufacturing and repair technology, the service life of blades can be extended and the replacement frequency caused by damage can be reduced, thereby improving the reliability and economy of aircraft engines. On the other hand, remanufacturing and repair technology can shorten the blade maintenance cycle, quickly respond to aircraft maintenance needs, reduce aircraft downtime, and improve the operating efficiency of airlines.

[0004] Therefore, it is urgent to develop an efficient and high-quality remanufacturing and repair method for TiAl alloy blades. This article discloses a remanufacturing and repair method that uses the synergistic action of multiple laser beams to produce a high entropy effect in situ. The high entropy effect produced 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 can more directly form the required high entropy alloy coating on the blade surface, simplifying the manufacturing process. Through the 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, and provides new ideas for the repair of key components such as alloy blades. Summary of the invention

[0005] The purpose of the present invention is to provide a remanufacturing and repairing method that can extend the service life of TiAl alloy blades and improve their surface properties. The main purpose is to use the Nb, Mo, Ta elements in the repair powder raw material and the Ti and Al elements in the TiAl alloy blade to react in situ with high entropy to form a NbMoTaTiAl alloy coating with a high entropy effect. Three laser beams are used to repair according to a predetermined process route, so that the five elements of Mo, Nb, Ta, Ti, and Al are evenly distributed in the molten pool to enhance the high entropy effect after the elements are mixed.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A remanufacturing and repairing method for in-situ high entropy effect generated by the synergistic action of multiple laser beams. The method aims to remanufacture and repair the surface of a TiAl alloy blade after it is worn. First, the first laser beam A is used to preheat the TiAl alloy substrate along the repair direction to melt it to form a molten pool D rich in Ti and Al elements. Secondly, the second laser beam B is used to heat and melt the Mo, Nb, and Ta mixed powder sent by the laser cladding head to form a molten pool E rich in Mo, Nb, and Ta elements. As the laser B moves along the repair direction, the molten pool D merges with the molten pool E to form a molten pool F rich in Mo, Nb, Ta, Ti, and Al elements. Next, the third laser beam C is used to swing and heat the molten pool F rich in Mo, Nb, Ta, Ti, and Al elements in a spiral line according to a preset route. The swinging action of the third laser beam C stirs the molten pool F, so that the five elements of Mo, Nb, Ta, Ti, and Al are evenly distributed in the molten pool, and the high entropy effect after the elements are mixed is enhanced. Finally, after the molten pool F is cooled, a MoNbTaTiAl high entropy alloy coating is formed on the surface of the TiAl alloy substrate. This method can achieve high-quality repair of the TiAl alloy blade surface and effectively extend its service life by in-situ generating a high entropy effect through added elements and matrix elements.

[0008] As a preference, the method specifically comprises the following steps:

[0009] Step 1: The first laser beam A preheats the TiAl alloy substrate along the repairing direction to melt it and form a molten pool D rich in Ti and Al elements;

[0010] Step 2: The second laser beam B heats and melts the mixed powder of Mo, Nb and Ta delivered by the laser cladding head to form a molten pool E rich in Mo, Nb and Ta elements;

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

[0012] Step 4: The third laser beam C swings along a preset swing path and heats the molten pool F rich in Mo, Nb, Ta, Ti, and Al elements. The swinging action of the third laser beam C stirs the molten pool F, so that the five elements of Mo, Nb, Ta, Ti, and Al are evenly distributed in the molten pool F, thereby enhancing the high entropy effect after the elements are mixed;

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

[0014] The beneficial effect of the present invention is to provide a remanufacturing and repair method that uses the synergistic action 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, and the coating not only has excellent surface properties, but also forms a strong bond with the base material. The in-situ reaction reduces the need for post-processing, and the required high entropy alloy coating can be formed more directly on the blade surface, simplifying the manufacturing process. The high entropy alloy coating effectively extends the service life of TiAl alloy blades, reduces the frequency of maintenance and replacement, and improves the operating efficiency and economy of the engine. The method of the present invention 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 aviation alloy blade maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0017] Figure 3 The present invention Figure 2 Schematic diagram of the cross section in the AA direction;

[0018] Figure 4 is a schematic diagram of a local device provided by a specific embodiment of the present invention;

[0019] Figure 5 It is a schematic diagram of projection of the focal spots of three laser beams provided by a specific embodiment of the present invention on the surface of a TiAl substrate;

[0020] Figure 6 It is a schematic flow chart of a remanufacturing and repairing method provided by a specific embodiment of the present invention;

[0021] In the figure:

[0022] The first laser beam A (1), the second laser beam B (2), the third laser beam C (3), the laser cladding head (4), the TiAl alloy substrate (5), the MoNbTaTiAl high entropy alloy coating (6), the repair forward direction (7), the Mo, Nb, Ta mixed powder (8), the molten pool D rich in Ti and Al elements (9), the molten pool E rich in Mo, Nb, Ta elements (10), the molten pool F rich in Mo, Nb, Ta, Ti, Al elements (11), and the swing route (12). DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0024] The present invention provides a remanufacturing and repairing method for generating a high entropy effect in situ by synergistic action of multiple laser beams, characterized by comprising a first laser beam A (1), a second laser beam B (2), a third laser beam C (3), a laser cladding head (4), a TiAl alloy substrate (5), a MoNbTaTiAl high entropy alloy coating (6), a repairing forward direction (7), a mixed powder of Mo, Nb and Ta (8), a molten pool D (9) rich in Ti and Al elements, a molten pool E (10) rich in Mo, Nb and Ta elements, a molten pool F (11) rich in Mo, Nb, Ta, Ti and Al elements, and a swinging route (12).

[0025] Specifically, Figure 1 , Figure 2 , Figure 3As shown, a first laser beam A (1) preheats a TiAl alloy substrate (5) along a repairing advancing direction (7) to melt the substrate to form a molten pool D (9) rich in Ti and Al elements; a second laser beam B (2) heats and melts a mixed powder (8) of Mo, Nb and Ta delivered by a laser cladding head (4) to form a molten pool E (10) rich in Mo, Nb and Ta elements; as the laser beam B (2) advances along the repairing direction, the molten pool D (9) rich in Ti and Al elements merges with the molten pool E (10) rich in Mo, Nb, Ta, Ti and Al elements to form a molten pool F (11) rich in Mo, Nb, Ta, Ti and Al elements; and a third laser beam C (3) swings according to a preset swinging route (12) and heats the molten pool F (11) rich in Mo, Nb, Ta, Ti and Al elements. The third laser beam C (3) is oscillating to stir the molten pool F (11), so that the five elements of Mo, Nb, Ta, Ti, and Al are evenly distributed in the molten pool F (11), so as to achieve a high entropy effect after the elements are mixed. Finally, 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, Figure 4 As shown, with the repair direction as the reference positive direction, the first laser beam A (1) is at the front end of the repair direction. The second laser beam B (2) is behind the first laser beam A (1). The third laser beam C (3) is behind the second laser beam B (2). The three laser beams use the same scanning speed, and the process parameters of the three laser beams are adjusted to ensure that the first laser beam A (1) emits light first, the second laser beam B (2) emits light after a delay of 0.5 seconds, and the third laser beam C (3) emits light after a delay of 1 second. In particular, the third laser beam C (3) oscillates according to a preset oscillation route (12).

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

[0028] Specifically, Figure 6 As shown, a detailed implementation process of a remanufacturing repair method for in-situ high entropy effect generated by the synergistic action of multiple laser beams is provided, and this flow chart is combined to facilitate understanding of the specific implementation steps of the present invention. In particular, the first laser beam A (1), the second laser beam B (2), and the third laser beam 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 embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

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

2. The remanufacturing and repair method of in-situ high entropy effect generated by synergistic action of multiple laser beams according to claim 1 is characterized in that: The following steps are involved: Step 1: The first laser beam A (1) preheats the TiAl alloy substrate (5) along the repairing direction (7) to melt the substrate to form a molten pool D (9) rich in Ti and Al elements; Step 2: The second laser beam B (2) heats and melts the mixed powder (8) of Mo, Nb and Ta delivered by the laser cladding head (4) to form a molten pool E (10) rich in Mo, Nb and Ta elements; Step 3: As the laser B (2) moves along the repairing 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: The third laser beam C (3) swings along a preset swing path (12) and heats the molten pool F rich in Mo, Nb, Ta, Ti, and Al elements. The swinging action of the third laser beam C (3) stirs the molten pool F (11), so that the five elements of Mo, Nb, Ta, Ti, and Al are evenly distributed in the molten pool F (11), thereby enhancing the high entropy effect after the elements are mixed; Step 5: After the molten pool F (11) is cooled, a MoNbTaTiAl high entropy alloy coating (6) is formed on the surface of the TiAl alloy substrate (5).

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