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CN-122007446-A - High-temperature alloy for generating nano reinforcing phase in situ by utilizing double laser additive materials, preparation method and application thereof

CN122007446ACN 122007446 ACN122007446 ACN 122007446ACN-122007446-A

Abstract

The invention relates to the field of high-temperature alloy, in particular to a preparation method of a high-temperature alloy for generating a nano reinforcing phase in situ by utilizing double laser additive materials, which comprises the following steps of preparing powder according to the performance requirement of a component; setting parameters of a dual-laser DED system, carrying out primary laser deposition to form a molten pool deposition layer, carrying out secondary laser local heating to generate a nano reinforcing phase in situ on the molten pool deposition layer, and repeating the steps S3 and S4 to form multi-layer deposition until the component is completed. The active elements or the compounds react in situ to form nano particles in the additive manufacturing process, so that matrix columnar crystals can be converted into equiaxial crystals, dispersion strengthening is realized, and the high-temperature strength of the material is improved.

Inventors

  • ZHOU LIUCHENG
  • MENG SHAOPENG
  • Pan Xinlei
  • LI BIN
  • YANG HONGWEI
  • SUN XIN

Assignees

  • 中国人民解放军空军工程大学

Dates

Publication Date
20260512
Application Date
20260212

Claims (9)

  1. 1. The preparation method of the superalloy with the nano reinforcing phase generated in situ by using the double laser additive is characterized by comprising the following steps: s1, preparing powder according to performance requirements of components; s2, setting parameters of a dual-laser DED system according to performance requirements of the components; S3, main laser deposition is carried out to form a molten pool deposition layer; S4, auxiliary laser local heating is carried out, and a nano reinforcing phase is generated in situ on a molten pool deposition layer; S5, repeating the steps S3 and S4 to form multi-layer deposition until the component is completed.
  2. 2. The method for preparing the superalloy by utilizing the dual laser material increase in-situ generation of the nanometer reinforced phase according to claim 1, wherein in the step S3, the laser power is 200-800W, the scanning speed is 2-5 mm/S, the powder feeding amount is 5-15 g/min, the protective atmosphere Ar and the oxygen content is less than 50 ppm.
  3. 3. The method of claim 1, wherein in step S4, the laser power is 50-300W, the pulse width is 290-fs-900 ps, and the scanning speed is 2-5 mm/S.
  4. 4. The method of claim 1, further comprising, in step S4, adjusting a scanning trajectory of the auxiliary laser to achieve uniform distribution of the nano-reinforcement phase.
  5. 5. The method for preparing a superalloy with dual laser additive in-situ generation of nano reinforcement phase according to claim 1, wherein the particle size of the powder is 40-120 μm.
  6. 6. An application of generating a nano reinforcing phase in situ by utilizing double laser additive is characterized in that the method is based on the high-temperature alloy preparation method as set forth in any one of claims 1-5 and is used for preparing Ni-based, co-based, fe-based and high-entropy alloy systems.
  7. 7. The use of dual laser additive in situ generation of nano-reinforcement phases according to claim 6, wherein the powder comprises the following raw materials in mass percent when preparing nickel-based alloys: 8-10% of Mo, 20-25% of Cr, 15-20% of Fe, 2-5% of Co, 0.5-1% of W, 0-0.1% of C, 0-0.1% of Si and the balance of Ni.
  8. 8. The use of dual laser additive in situ generation of nano-reinforcement phases according to claim 6, characterized in that in the preparation of high entropy alloys, the powder comprises the following raw materials in mass percent: 22-24% of Co, 18-20% of Cr, 18-20% of Fe, 18-20% of Mn, 18-20% of Ni, 0.8-1.2% of Al, 0.5-0.8% of Ti, 0-0.05% of C, less than or equal to 0.03% of O and the balance of unavoidable impurities.
  9. 9. A superalloy prepared by a superalloy preparation method according to any of claims 1 to 5 using dual laser additive in situ generation of a nanoreinforcement phase.

Description

High-temperature alloy for generating nano reinforcing phase in situ by utilizing double laser additive materials, preparation method and application thereof Technical Field The invention relates to the field of high-temperature alloy, in particular to a high-temperature alloy for generating a nano reinforcing phase in situ by utilizing double laser additive materials, a preparation method and application thereof. Background The high-temperature alloy has key application in the fields of aerospace, energy equipment and the like, such as turbine blades, gas turbines, high-temperature dies, core components of nuclear energy devices and the like. Under these application environments, the materials must possess high temperature strength, creep resistance, thermal stability and fatigue resistance properties at the same time. The traditional preparation method of the superalloy comprises the technologies of casting, powder metallurgy, hot isostatic pressing and the like, but has the following defects: 1. The structure uniformity and performance limit are that segregation, holes and coarse crystal structure are easy to generate in the casting process, so that the high-temperature performance and service life of the material are limited, and the powder metallurgy process can obtain more uniform microstructure, but the efficiency of manufacturing the component with the complex shape is low. 2. Nanometer strengthening is difficult to realize, particle agglomeration easily occurs when nanometer particles are mixed in advance for powder preparation, the dispersibility is poor, the strengthening effect is affected, and meanwhile, the powder fluidity and the powder feeding uniformity are also affected. Laser Directed Energy Deposition (DED) is of interest in aircraft engines and energy equipment because of its high deposition rate and the advantage of being able to manufacture complex large-sized components. Compared with powder bed melting (PBF), DED has high deposition efficiency and can construct large-size components, but has high melting pool temperature and slower cooling rate, and is easy to form a coarse-grain structure, thereby limiting the traditional grain strengthening effect. Disclosure of Invention The invention aims to provide a preparation method of a high-temperature alloy by utilizing double laser material-adding in-situ generation of nano reinforcing phases, which can convert matrix columnar crystals into equiaxed crystals by realizing in-situ reaction of active elements or compounds to form nano particles in the material-adding manufacturing process, thereby realizing dispersion strengthening and improving the high-temperature strength of the material. The invention further aims to provide a high-temperature alloy which utilizes double laser material increase to generate nano reinforcing phases in situ, and the matrix columnar crystals can be converted into equiaxed crystals by introducing the nano reinforcing phases generated in situ, so that dispersion strengthening is realized, and the high-temperature strength of the material is improved. The invention solves the technical problems by adopting the following technical scheme. In one aspect, the embodiment of the invention provides a method for preparing a superalloy by utilizing dual laser additive to generate a nano reinforcing phase in situ, which comprises the following steps: s1, preparing powder according to performance requirements of components; s2, setting parameters of a dual-laser DED system according to performance requirements of the components; S3, main laser deposition is carried out to form a molten pool deposition layer; S4, auxiliary laser local heating is carried out, and a nano reinforcing phase is generated in situ on a molten pool deposition layer; S5, repeating the steps S3 and S4 to form multi-layer deposition until the component is completed. In some embodiments of the invention, in step S3, the laser power is 200-800W, the scanning speed is 2-5 mm/S, the powder feeding amount is 5-15 g/min, and the oxygen content is less than 50 ppm in the protective atmosphere Ar. In some embodiments of the invention, in step S4, the laser power is 50-300W, the pulse width is 290 fs-900 ps, and the scanning speed is 2-5 mm/S. In some embodiments of the present invention, in step S4, the scanning track of the auxiliary laser is further adjusted to achieve uniform distribution of the nano-reinforcement phase. In some embodiments of the invention, the particle size of the powder is 40-120 μm. In a second aspect, embodiments of the present invention provide an application of dual laser additive in-situ generation of nano-reinforcement phases, based on the above method, for preparing Ni-based, co-based, fe-based and high entropy alloy systems. In some embodiments of the present invention, in preparing a nickel-based alloy, the powder comprises the following raw materials in mass percent: 8-10% of Mo, 20-25% of Cr, 15-20% of Fe, 2-5% of Co, 0.5-