Multi-principal-element alloy preparation device and method based on coaxial powder feeding and interlayer blue light remelting

Abstract

The invention discloses a multi-principal-element alloy preparation device and method based on coaxial powder feeding and interlayer blue light remelting, the device capable of executing the method is provided according to the invention, and the device comprises a tunable laser light source, a frequency doubling optical element, a laser deflection total reflection mirror, a liquid adjustable focal length lens, an electrochromic mirror and the like; according to the manufacturing method of the high-entropy alloy deposition component and the method for achieving the manufacturing process, a switch of an electromagnet is turned on according to the material requirement to control the on-off state of a reflector electromagnet block, and the angle of a laser deflection holophote can be controlled through the interaction of the reflector electromagnet block and a reflector strong magnetic sheet; the laser is driven to enter different optical elements to respectively generate common laser and blue laser, after the common laser is subjected to laser melting deposition, the blue laser can perform deep melting type laser remelting on a solidified deposition layer, and finally a deposition component with uniform element distribution and grain morphology is formed.

Description

[0001] Author: Zhan Xiaohong, Zhang Yumeng, Wang Leilei, Sun Longxiang Technical Field

[0002] The present invention belongs to the technical field of additive manufacturing, and relates to a multi-principal element alloy preparation device and method based on coaxial powder feeding and interlayer blue light remelting. Background Art

[0003] The rapid heating and cooling characteristics of the additive manufacturing process are superior. It is difficult to fully fuse multiple alloys through traditional processes to prepare multi-principal alloys with uniform element distribution and grain morphology. In order to achieve the purpose of uniform diffusion of elements and grain refinement, researchers began to use the interlayer remelting method to fully fuse the alloys that were not mixed in time during the additive process. However, the energy density of the ordinary interlayer remelting method is limited, which limits the effective depth of the light source in the deposited layer. Summary of the invention

[0004] In order to solve the problems existing in the above technical background, the present invention proposes a multi-principal element alloy preparation device and method based on coaxial powder feeding and interlayer blue light remelting. By coaxial powder feeding and interlayer remelting, a laser heat source with a higher energy density is used to complete the interlayer preparation of laser melting deposition components with a microstructure of alternating coarse grains and fine grains, thereby greatly enhancing the strength and toughness of the laser melting deposition components.

[0005] The technical solution of the present invention to solve the above problems is: a multi-principal component alloy preparation device and method based on coaxial powder feeding and interlayer blue light remelting. The traditional interlayer remelting method is carried out by changing process parameters or introducing an additional pulse heat source, while the special feature of this method is that it is necessary to introduce a blue light high-density heat source for interlayer remelting at the same time as the main light source laser melting deposition. The blue light heat source moves with the main light source and maintains the same speed as the main light source.

[0006] As a result of the present invention, a laser melting deposition method is provided. This method can be associated with the field of rapid manufacturing and rapid prototyping. But as will become apparent, it is not only suitable for the manufacture of individual models, but can also be used for surface modification.

[0007] In the method according to the present invention, an object is manufactured in the following manner: the type of raw materials used for the additive component and the mechanical properties such as hardness, strength, elongation, etc. that the additive component is intended to achieve are input into the control host, and the knowledge base in the control host calls the sample data for rapid analysis to obtain optimal main laser power, scanning time, remelting heat source power and other parameters. In the additive process, the tunable laser light source 1 emits laser light through the objective lens and the λ / 4 filter plate to the laser deflection total reflection mirror I. In this process, the laser deflection total reflection mirror I is located in the original position and does not contact the laser light, and is directly transmitted to the mechanism where the main light source is located, thereby melting the high entropy alloy powder to form a high entropy alloy deposition layer; in the remelting process after the deposition layer is formed, the operator can turn on the switch I and the switch II as needed, and then the current is transmitted to the switch electromagnet block I and the switch electromagnet block II. After the switch electromagnet block I and the switch electromagnet block II are energized, N / S poles are generated, which are repelled by the strong magnetic steel I and drive the conductive column I and the conductive column II to contact the reflector electromagnet I fixing table and the reflector electromagnet II fixing table, so that the reflector electromagnet block I and the reflector electromagnet block II are energized to attract the reflector deflection The strong magnetic sheet I and the reflector deflection strong magnetic sheet II drive the laser deflection total reflection mirror I and the laser deflection total reflection mirror II to rotate 45°. The laser generated by the tunable laser light source 1 is reflected and deflected by the laser deflection total reflection mirror I and then focused by the collimating lens into the frequency doubling optical element. The frequency doubling optical element shortens the wavelength of the laser light to 463nm. After that, the new laser light is deflected by the laser deflection total reflection mirror IV and the laser deflection total reflection mirror II and then re-enters the liquid adjustable focus lens. The liquid adjustable focus lens adjusts the focus upward to expand the effective diameter of the laser light source. At this time, the electrochromic mirror turns black after being energized, absorbs part of the blue light, and transforms the light source into a ring light source. After being re-emitted from the powder feeding copper block, a blue light laser with better parameters is finally generated to remelt the deposited components. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a schematic diagram of the apparatus used in the laser melting deposition process;

[0009] Figure 2 is a schematic diagram of the apparatus used in the interlayer remelting process;

[0010] In the figure:

[0011] 1. Tunable laser light source, 2. Objective lens, 3. λ / 4 filter plate, 4. Reflector deflection strong magnetic sheet I, 5. Torsion spring I, 6. Laser deflection total reflector I, 7. Reflector deflection limit block I, 8. First support platform, 9. Reflector electromagnet I, 10. Reflector electromagnet I fixing table, 11. Reflector electromagnet I fixing table fastening bolt I, 12. Conductive column I, 13. Switch electromagnet block I, 14. Strong magnetic steel I, 15. Switch I, 16. Laser deflection total reflector II, 17. Torsion spring II, 18. Reflector deflection strong magnetic sheet II, 19. Reflector deflection limit block II, 20. Reflector electromagnet II, 21. Reflector electromagnet II fixing table, 22. Reflector electromagnet II fixing table fastening bolt Bolt II, 23. Conductive column II, 24. Switch electromagnet block II, 25. Strong magnetic steel II, 26. Switch II, 27. Switch electromagnet block III, 28. Conductive column III, 29. Liquid adjustable focal length lens, 30. Electrochromic mirror, 31. High lens, 32. Powder feeding copper block, 33. Blue light, 34. Third support platform fastening bolts, 35. Third support platform, 36. Second support platform fastening bolts, 37. Second support platform, 38. Laser deflection total reflection mirror IV, 39. Frequency doubling optical element, 40. Collimating lens II, 41. Laser deflection total reflection mirror III, 42. First support platform fastening bolts, 43. Deposition component, 44. Work table, 45. 1064nm wavelength laser. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations on the embodiments of the present invention. It is not necessary and impossible to list all the embodiments here.

[0013] Figure 1 and Figure 2 Schematic diagrams of the devices used in the additive process and the remelting process are shown respectively.

[0014] A high entropy alloy preparation device and method based on coaxial powder feeding and interlayer blue light remelting, comprising: a tunable laser light source 1, an objective lens 2, a λ / 4 filter plate 3, a reflector deflection strong magnetic sheet I 4, a torsion spring I 5, a laser deflection total reflector I 6, a reflector deflection limit block I 7, a first supporting platform 8, a reflector electromagnet I 9, a reflector electromagnet I fixing platform 10, a reflector electromagnet I fixing platform fastening bolt I 11, a conductive column I 12, a switch electromagnet block I 13, a strong magnetic steel I 14, a switch I 15, a laser deflection total reflector II 16, a torsion spring II 17, a reflector deflection strong magnetic sheet II 18, a reflector deflection limit block II 19, a reflector electromagnet II 20, a reflector electromagnet II fixing platform 21, a reflector electromagnet II fixing platform fastening bolt II 22, a conductive column II 23, a switch electromagnet block II 24, a strong magnetic steel II 25, switch II 26, switch electromagnet block III 27, conductive column III 28, liquid adjustable focus lens 29, electrochromic mirror 30, high lens 31, powder feeding copper block 32, blue light 33, third support platform fastening bolt 34, third support platform 35, second support platform fastening bolt 36, second support platform 37, laser deflection total reflection mirror IV 38, frequency doubling optical element 39, collimating lens II 40, laser deflection total reflection mirror III 41, first support platform fastening bolt 42, deposition component 43, work table 44, 1064nm wavelength laser 45. The special features of this system are:

[0015] A frequency doubling optical element is provided in the system. Some KTiPO4 is stored in the frequency doubling optical element, which can generate blue light 33 from the tuned laser. Meanwhile, a liquid adjustable focus lens 29 and an electrochromic mirror 30 are provided in the system. The liquid adjustable focus lens 29 can increase the focal length and expand the effective diameter of the laser spot after applying an electric field, and the electrochromic mirror 30 can absorb part of the blue light, thereby increasing the energy density and forming a ring light source and reducing the total heat input.

[0016] The liquid adjustable focus lens 29 is connected to the center of the second support platform 37 in the horizontal direction, and the electrochromic mirror 30 and the high lens 31 are fixed inside the system through the third support platform 35;

[0017] The type of raw materials used for the additive component and the desired mechanical properties of the additive component, such as hardness, strength, and elongation, are input into the control host. The knowledge base in the control host calls the sample data for rapid analysis to obtain optimal parameters such as main laser power, scanning time, and remelting heat source power. In the additive process, the tunable laser light source 1 emits laser light through the objective lens 2 and the λ / 4 filter plate 3 to the laser deflection total reflection mirror I6. In this process, the laser deflection total reflection mirror I6 is located in the original position and does not contact the laser light, and is directly transmitted to the mechanism where the main light source is located, thereby melting the high entropy alloy powder to form a high entropy alloy deposition layer; in the remelting process after the deposition layer is formed, the operator can turn on the switch I15 and the switch II26 as needed, and then the current is transmitted to the switch electromagnet block I13 and the switch electromagnet block II24. After the switch electromagnet block I13 and the switch electromagnet block II24 are energized, N / S poles are generated, which are repelled by the strong magnetic steel I14 and the strong magnetic steel II25 and drive the conductive column I12 and the conductive column II23 to contact the reflector electromagnet I fixing platform 10 and the reflector electromagnet II fixing platform 21, so that the reflector electromagnet block I13 and the reflector electromagnet block II24 are energized, attracting the reflector deflection strong magnetic sheet I 4 and the reflector deflection strong magnetic sheet II 18 and drive the laser deflection total reflection mirror I 6 and the laser deflection total reflection mirror II 16 to rotate 45°. The laser generated by the tunable laser light source 1 is reflected and deflected by the laser deflection total reflection mirror I 6 and then focused by the collimating lens 40 into the frequency doubling optical element 39. The frequency doubling optical element 39 shortens the wavelength of the laser light to 463nm. Then, the new laser light is deflected by the laser deflection total reflection mirror IV 38 and the laser deflection total reflection mirror II and then re-enters the liquid adjustable focus lens 29. The liquid adjustable focus lens 29 adjusts the focus upward to expand the effective diameter of the laser light source. At this time, the electrochromic mirror 30 turns black after being energized, absorbs part of the blue light 33, and transforms the light source into a ring light source. After being re-emitted from the powder feeding copper block 32, a blue light laser with better parameters is finally generated to remelt the deposition component 43.

[0018] The contents of this specification should not be construed as limiting the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description according to the concept of the present invention. It should be pointed out that any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A high entropy alloy preparation device based on coaxial powder feeding and interlayer blue light remelting, characterized in that: The laser head is provided with a reflector electromagnet block I (9) and a reflector electromagnet block II (20) which can control the rotation of a laser deflection total reflector. The reflector electromagnet I (9) and the reflector electromagnet II (20) are respectively fixed in the laser head through a reflector electromagnet I fixing platform (10) and a reflector electromagnet II fixing platform (21). In addition, the laser head is provided with a tunable laser light source (1) and a frequency doubling optical element (39) which respectively generate a normal laser of 1064 nm and a blue laser of 463 nm in wavelength.

2. A high entropy alloy preparation device and method based on coaxial powder feeding and interlayer blue light remelting, characterized in that: The method is carried out on the basis of any one of the laser melting deposition devices in claim 1, comprising the following steps: The method adopts a method of dividing the same light source into two laser beams, and the additive process and the interlayer remelting process respectively adopt two light sources with different wavelengths. The additive process adopts a laser with a wavelength of 1064nm, and the laser deflection total reflection mirror is located in the original position during the process. The laser generates normal laser after propagating through the laser with a wavelength of 1064nm; and after the laser melts and deposits the deposited layer, the reflector electromagnet I (9) and the reflector electromagnet II (20) are turned on to drive the laser deflection total reflection mirror I (6) and the laser deflection total reflection mirror II (16) to rotate to the position of the limit block, and the laser deflection total reflection mirror deflects 45° around the rotation center, so that the laser is deflected by 90°, and then propagates through the frequency doubling optical element (39) to generate blue light with a wavelength of 463nm, and the blue light laser is used to perform deep melting laser remelting on the deposited component to achieve this purpose. The type of raw materials used for the additive component and the mechanical properties such as hardness, strength, and elongation that the additive component is intended to achieve are input into the control host, and the knowledge base in the control host calls sample data for rapid analysis to obtain optimal parameters such as main laser power, scanning time, and remelting heat source power. In the additive process, the disk light source (1) emits laser light through the objective lens (2) and the λ / 4 filter plate (3) to the laser deflection total reflection mirror I (6). In this process, the laser deflection total reflection mirror I (6) is located in the original position and does not contact the laser light, and directly transmits to the mechanism where the main light source is located, thereby melting the high entropy alloy powder to form a high entropy alloy deposition layer; in the remelting process after the deposition layer is formed, the control system turns on the reflector electromagnet I (9) and the reflector electromagnet II (20) according to the input command to drive the laser deflection total reflection mirror I (6) and the laser deflection total reflection mirror II (16) to reach the limit block I (6) and the limit block II (14) respectively. After the laser deflection total reflection mirror I (6) is rotated 45° clockwise and the laser deflection total reflection mirror II (16) is rotated 45° counterclockwise. The laser emitted by the tunable laser light source (1) is deflected to the frequency doubling optical element (39) after passing through the laser deflection total reflection mirror I (6) and the laser deflection total reflection mirror III (41) to generate a blue laser with a wavelength of 463 nm. The blue laser is deflected by the laser deflection total reflection mirror IV (38) and the laser deflection total reflection mirror II (16) and then converged to the position of the powder feeding copper block (22). Finally, a blue laser with better parameters is generated to remelt the deposited layer on the surface of the deposition component (43).

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