CN-122007443-A - Method and device for regulating and controlling tissue performance of nickel-based superalloy manufactured by pulse laser auxiliary additive

CN122007443ACN 122007443 ACN122007443 ACN 122007443ACN-122007443-A

Abstract

The invention relates to a method and a device for regulating and controlling the tissue performance of nickel-based superalloy manufactured by pulse laser auxiliary additive, belonging to the technical field of additive manufacturing, wherein the method comprises the steps of controlling the oxygen content in a sealed forming cabin of a LPBF forming device, and flatly paving nickel-based superalloy powder on a substrate of the sealed forming cabin; and controlling the pulse laser and the continuous laser to output laser beams, coupling the pulse laser beams and the continuous laser beams in a polarization beam combination or wavelength beam combination mode, and after adjusting the focal length of the coupled laser beams, carrying out fusion forming on the nickel-based superalloy powder on the substrate. According to the method, the pulse laser and the continuous laser are coupled into the coaxial light spots, so that in-situ synchronous disturbance to a molten pool in the LPBF additive manufacturing process is realized, the solidification behavior of the nickel-based superalloy can be accurately regulated, the epitaxial growth of columnar crystals is effectively broken, the formation of fine equiaxed crystals is promoted, and the anisotropy and cracking risk of materials are reduced.

Inventors

HAN QUANQUAN
LIU GUOJIE
ZHANG ZHENHUA
WANG LIQIAO
ZHAO PENG
ZHU MIN

Assignees

山东大学

Dates

Publication Date: 20260512
Application Date: 20260408

Claims (10)

1. The method for regulating the tissue performance of the nickel-based superalloy manufactured by pulse laser auxiliary additive is characterized by comprising the following steps of: (1) Controlling the oxygen content in a sealed forming cabin of the LPBF forming device, and spreading nickel-based superalloy powder on a substrate of the sealed forming cabin; (2) And controlling the pulse laser and the continuous laser to output laser beams, coupling the pulse laser beams and the continuous laser beams into coaxial light spots in a polarization beam combination or wavelength beam combination mode, and after the coupled laser beams adjust the focal length, carrying out fusion forming on the nickel-based superalloy powder on the substrate.
2. The method for regulating tissue performance of the nickel-based superalloy by using the pulse laser to assist additive manufacturing is characterized in that the specific method for polarization beam combination is that pulse laser beams sequentially pass through a collimating lens A, a beam expander A, a film polarizer A and a half-wave plate A, horizontal polarized pulse laser beams are output, continuous laser beams sequentially pass through a collimating lens B, a beam expander B, a film polarizer B and a half-wave plate B, vertical polarized continuous laser beams are output, and the horizontal polarized pulse laser beams and the vertical polarized continuous laser beams output coaxial coupled laser beams through a polarization beam splitting prism.
3. The method for regulating the tissue performance of the nickel-based superalloy by using the pulse laser to assist the additive manufacturing is characterized in that the specific method for combining the wavelengths is that the pulse laser beam sequentially passes through a collimating mirror A and a beam expander A, outputs a collimated and beam-expanded pulse laser beam, the continuous laser beam sequentially passes through a collimating mirror B and a beam expander B, outputs a collimated and beam-expanded continuous laser beam, and the collimated and beam-expanded pulse laser beam and the collimated and beam-expanded continuous laser beam output coaxial coupled laser beams through a dichroic mirror.
4. The method for regulating and controlling the tissue performance of the nickel-base superalloy by using the pulse laser as defined in claim 1, wherein the process parameters set by the pulse laser are 100-1000W, 10-2000 ns pulse width, 1-400 kHz repetition frequency and 50-200 μm spot diameter.
5. The method for regulating and controlling the tissue performance of the nickel-base superalloy by using the pulse laser assisted additive manufacturing according to claim 1, wherein the technological parameters set by the continuous laser are 100-4000W, and the spot diameter is 50-200 μm.
6. The method for regulating and controlling the tissue performance of the nickel-base superalloy by using the pulse laser assisted additive manufacturing according to claim 1, wherein the technological parameters of the coupled laser beam are set to be that the scanning speed of the coupled laser beam is 500-1500 mm/s, and the rotation angle of the coupled laser beam is 67 degrees or 90 degrees during interlayer scanning.
7. The device for regulating and controlling the tissue performance of the nickel-based superalloy manufactured by the pulse laser auxiliary additive is used for regulating and controlling the tissue performance of the nickel-based superalloy manufactured by the pulse laser auxiliary additive according to claim 1, and is characterized by comprising a computer control system, a pulse laser, a continuous laser, a coupling light path system and a LPBF forming device, wherein the pulse laser and the continuous laser are respectively in communication connection with the computer control system, the coupling light path system is arranged on the output sides of the pulse laser and the continuous laser, and the LPBF forming device is arranged on the output side of the coupling light path system.
8. The device for regulating tissue performance of the nickel-based superalloy manufactured by pulse laser auxiliary additive manufacturing according to claim 7, wherein the coupling light path system comprises a collimating lens A, a collimating lens B, a beam expander A, a beam expander B, a film polarizer A, a film polarizer B, a half-wave plate A, a half-wave plate B, a polarization beam splitter prism, a galvanometer system and an F-theta lens, wherein the output side of the pulse laser is sequentially provided with the collimating lens A, the beam expander A, the film polarizer A and the half-wave plate A, the output side of the continuous laser is sequentially provided with the collimating lens B, the beam expander B, the film polarizer B and the half-wave plate B, and the output sides of the half-wave plate A and the half-wave plate B are sequentially provided with the polarization beam splitter prism, the galvanometer system and the F-theta lens.
9. The device for regulating tissue performance of the nickel-based superalloy manufactured by pulse laser auxiliary additive according to claim 7, wherein the coupling light path system comprises a collimating lens A, a collimating lens B, a beam expander A, a beam expander B, a dichroic mirror, a vibrating mirror system and an F-theta lens, wherein the collimating lens A and the beam expander A are sequentially arranged on the output side of the pulse laser, the collimating lens B and the beam expander B are sequentially arranged on the output side of the continuous laser, and the dichroic mirror, the vibrating mirror system and the F-theta lens are sequentially arranged on the output sides of the beam expander A and the beam expander B.
10. The device for regulating tissue performance of the nickel-based superalloy manufactured by pulse laser assisted additive manufacturing according to claim 8 or 9, wherein the LPBF forming device comprises a powder spreading scraper, a powder feeding cylinder, a powder recovery system and a sealed forming cabin, wherein the powder spreading scraper, the powder feeding cylinder, the forming cylinder and the powder recovery system are all arranged in the sealed forming cabin, the forming cylinder is arranged in the sealed forming cabin at a position corresponding to an F-theta lens, the powder feeding cylinder and the powder recovery system are respectively arranged at two sides of the forming cylinder, the forming cylinder is internally provided with a forming platform and a substrate in sequence from bottom to top, the powder feeding cylinder is internally provided with the powder feeding platform, the powder spreading scraper is arranged above the forming cylinder and the powder feeding cylinder, and reciprocates above the forming cylinder and the powder feeding cylinder, so that nickel-based superalloy powder in the powder feeding cylinder is spread on the whole plane of the substrate.

Description

Method and device for regulating and controlling tissue performance of nickel-based superalloy manufactured by pulse laser auxiliary additive Technical Field The invention relates to the technical field of additive manufacturing, in particular to a method and a device for regulating and controlling the tissue performance of nickel-based superalloy manufactured by pulse laser auxiliary additive manufacturing. Background The laser powder bed melting (LPBF) additive manufacturing technology has the characteristics that the grain structure of the laser powder bed melting (LPBF) additive manufacturing technology has serious anisotropism due to the characteristics of laser layer-by-layer scanning powder deposition, a large number of coarse columnar crystals exist in LPBF formed high-temperature alloy, and the material is easy to crack and has anisotropism in mechanical property. Research shows that in the additive manufacturing forming process, an energy field is additionally introduced to disturb a solidification molten pool, so that the solidification process is regulated, grain refinement is facilitated, columnar crystal formation is reduced, anisotropy of the material is reduced, and cracking risk is reduced. The external field introduced by solidification behavior regulation in LPBF additive manufacturing process is mainly magnetic field and ultrasonic field, however, the magnetic field and ultrasonic field regulation mode has two problems. On the one hand, such energy fields are difficult to focus, and the action area cannot be accurately controlled, so that the action effect of the energy fields on solidification of a molten pool is difficult to accurately control. On the other hand, because of the narrow space of the LPBF forming cabin, the generators such as ultrasonic and magnetic fields are difficult to integrate into the LPBF equipment, and the feasibility of the forming solidification process of the external field regulation LPBF is further hindered. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a method and a device for regulating and controlling the tissue performance of a nickel-based superalloy manufactured by pulse laser auxiliary additive. The invention mainly solves the technical problems of reducing columnar crystal formation in the LPBF molten pool solidification process, thereby reducing the anisotropy and cracking risk of the material. The technical scheme of the invention is as follows: the invention provides a method for regulating and controlling the tissue performance of a nickel-based superalloy manufactured by pulse laser auxiliary additive manufacturing, which comprises the following steps: (1) Controlling the oxygen content in a sealed forming cabin of the LPBF forming device, and spreading nickel-based superalloy powder on a substrate of the sealed forming cabin; (2) And controlling the pulse laser and the continuous laser to output laser beams, coupling the pulse laser beams and the continuous laser beams into coaxial light spots in a polarization beam combination or wavelength beam combination mode, and after the coupled laser beams adjust the focal length, carrying out fusion forming on the nickel-based superalloy powder on the substrate. According to the preferred specific method of the polarization beam combination, the pulse laser beam sequentially passes through the collimating lens A, the beam expanding lens A, the film polarizer A and the half-wave plate A, the horizontal polarized pulse laser beam is output, the continuous laser beam sequentially passes through the collimating lens B, the beam expanding lens B, the film polarizer B and the half-wave plate B, the vertical polarized continuous laser beam is output, and the horizontal polarized pulse laser beam and the vertical polarized continuous laser beam output coaxial coupled laser beams through the polarization beam splitting prism. According to the specific method of the wavelength beam combination, a pulse laser beam sequentially passes through a collimating mirror A and a beam expanding mirror A, a collimated beam expanding pulse laser beam is output, a continuous laser beam sequentially passes through a collimating mirror B and a beam expanding mirror B, a collimated beam expanding continuous laser beam is output, and the collimated beam expanding pulse laser beam and the collimated beam expanding continuous laser beam output coaxial coupled laser beams through a two-phase mirror. According to a preferred embodiment of the invention, the nickel-base superalloy powder has a particle size in the order of micrometers. According to the invention, the process parameters of the pulse laser are set to 100-1000W, the pulse width is 10-2000 ns, the repetition frequency is 1-400 kHz, and the spot diameter is 50-200 μm. According to the invention, the technological parameters of the continuous laser are set to 100-4000W, and the spot diameter is 50-200 μm. The diameter of the spot of