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CN-122013002-A - Heat-resistant high-strength corrosion-resistant aluminum alloy powder, preparation method, additive part and additive manufacturing method

CN122013002ACN 122013002 ACN122013002 ACN 122013002ACN-122013002-A

Abstract

The invention provides a heat-resistant high-strength corrosion-resistant aluminum alloy powder and a preparation method thereof, an additive piece and an additive manufacturing method, wherein the heat-resistant high-strength corrosion-resistant aluminum alloy powder comprises, by mass, 2.5-5% of Mg2, 0.5-5% of Cr, 0.1-1.5% of Mn, 0.1-1.5% of Sc, 0.1-1.0% of Zr0.0% of Al and unavoidable impurities, and the total content of the impurities is not more than 0.3%. According to the heat-resistant high-strength corrosion-resistant aluminum alloy powder, the preparation method, the material-adding part and the material-adding manufacturing method, the spherical powder is prepared through a smelting-gas atomization process, and the optimized laser powder bed melting (LPBF) parameters are combined, so that the sample after heat treatment is free of cracks, high in compactness, high in yield strength and high in tensile strength, and meanwhile, excellent in high-temperature stability.

Inventors

  • CHAO QI
  • LV BINGHUA

Assignees

  • 雷铸科技(苏州)有限公司

Dates

Publication Date
20260512
Application Date
20260210

Claims (9)

  1. 1. The heat-resistant high-strength corrosion-resistant aluminum alloy powder is characterized by comprising, by mass, 2.5-5% of Mg, 0.5-5.0% of Cr, 0.1-1.5% of Mn, 0.1-1.5% of Sc, 0.1-1.0% of Zr, and the balance of Al and unavoidable impurities, wherein the total content of the impurities is not more than 0.3%.
  2. 2. The heat-resistant high-strength corrosion-resistant aluminum alloy powder according to claim 1, wherein the heat-resistant high-strength corrosion-resistant aluminum alloy powder comprises, by mass, 2.5% -5% of Mg, 1.0% -5.0% of Cr, 0.1% -1.5% of Mn, 0.1% -1.5% of Sc, 0.1% -1.0% of Zr0% and the balance of Al and unavoidable impurities, and the total content of impurities is not more than 0.3%.
  3. 3. The method for preparing the heat-resistant high-strength corrosion-resistant aluminum alloy powder according to claim 1, which is characterized by comprising the following steps: Alloy smelting, namely placing pure aluminum, pure magnesium, pure zirconium, pure manganese, al-Cr intermediate alloy and Al-Sc intermediate alloy into a vacuum induction smelting furnace, vacuumizing, filling protective gas, heating and smelting, preserving heat and casting into a master alloy ingot; And (3) performing gas atomization to prepare powder, namely remelting the master alloy ingot under the protection of argon, and preparing spherical powder by using a gas atomization system to obtain the heat-resistant high-strength corrosion-resistant alloy powder.
  4. 4. The method for preparing heat-resistant high-strength corrosion-resistant aluminum alloy powder according to claim 3, wherein the particle size distribution of the atomized powder after air classification satisfies D10 being more than or equal to 12 μm, D90 being less than or equal to 50 μm and sphericity being more than 0.85.
  5. 5. A method for producing a heat-resistant, high-strength and corrosion-resistant aluminum alloy powder according to claim 3, wherein the spherical powder has a particle size of 0 to 150 μm.
  6. 6. The method for preparing the heat-resistant high-strength corrosion-resistant aluminum alloy powder according to claim 3, wherein the temperature of the alloy during smelting is 950-1050 ℃, the heat preservation time is 30-60min, the vacuum degree is lower than 100Pa, and the remelting temperature is 900-1000 ℃.
  7. 7. A method of additive manufacturing based on the aluminum alloy powder of claim 1, comprising the steps of: And (3) carrying out vacuum drying on the alloy powder at 120-150 ℃ for 6-12h, and using the dried alloy powder for additive manufacturing.
  8. 8. The additive manufacturing method based on the aluminum alloy powder, which is disclosed in claim 7, is characterized in that the heat treatment is carried out on the parts manufactured by the additive, wherein the heat treatment comprises heating to 275-325 ℃, the heat preservation time is 1-12 h, and the air cooling is carried out after the heat preservation is finished.
  9. 9. An additive manufactured by an additive manufacturing method based on aluminum alloy powder according to any of claims 7-8.

Description

Heat-resistant high-strength corrosion-resistant aluminum alloy powder, preparation method, additive part and additive manufacturing method Technical Field The invention belongs to the technical field of additive manufacturing, and particularly relates to heat-resistant high-strength corrosion-resistant aluminum alloy powder, a preparation method, an additive part and an additive manufacturing method. Background With the increasing demand of modern industry for light and high-strength materials, aluminum alloy is an important material in the fields of aerospace, automobiles, ships, buildings and the like by virtue of high specific strength, excellent corrosion resistance and good processability. Conventional aluminum alloys can be classified into wrought aluminum alloys and cast aluminum alloys, and are mainly used for structural members requiring high strength and good ductility. In recent years, the development of additive manufacturing (3D printing) technology, in particular laser powder bed melting (LPBF) technology, brings new breakthrough to the manufacture of aluminum alloys. The LPBF technique enables accurate fabrication of complex structures by melting metal powder layer by layer, enabling the production of complex geometries such as embedded cooling channels, lightweight honeycomb structures, etc., which are difficult to achieve by conventional techniques. The method improves the utilization rate of materials, reduces the waste of materials in the production process, and realizes the refinement of microstructure, such as grain refinement, columnar crystal orientation equiaxial crystal transformation and the like by optimizing laser process parameters. However, the mechanical properties of additively manufactured aluminum alloys in high temperature environments remain challenging. The aluminum alloy formed by the conventional LPBF generally shows good strength at room temperature, but the high-temperature strength of the aluminum alloy decays rapidly due to the instability of alloy structures, so that the aluminum alloy is difficult to meet the requirements of aerospace and high-temperature service environments. In addition, the cooperative improvement of the room temperature high strength and the high temperature strength is always a difficult point, and the existing alloy system can sacrifice part of the room temperature strength while improving the high temperature performance. To break through this limitation, we have developed a new Al-Cr-Mg-Sc alloy. The alloy system optimizes microstructure by precisely regulating and controlling the proportion of Cr, mg and Sc elements and introducing a proper amount of X strengthening elements, thereby realizing more excellent comprehensive performance. Disclosure of Invention The invention aims to provide heat-resistant high-strength corrosion-resistant aluminum alloy powder, a preparation method, an additive piece and an additive manufacturing method, wherein spherical powder is prepared through a smelting-gas atomization process, and an optimized Laser Powder Bed Fusion (LPBF) parameter is combined, so that a sample after heat treatment has no crack, density of >99.9%, yield strength of >560MPa, tensile strength of >610MPa, and meanwhile, the heat-resistant high-strength corrosion-resistant aluminum alloy powder has excellent high-temperature stability (strength retention rate of >78% at 200 ℃ and strength retention rate of >54% at 250 ℃). The invention provides heat-resistant high-strength corrosion-resistant aluminum alloy powder which comprises, by mass, 2.5-5% of Mg, 0.5-5.0% of Cr, 0.1-1.5% of Mn, 0.1-1.5% of Sc, 0.1-1.0% of Zr0.1% of Al and the balance of unavoidable impurities, wherein the total content of the impurities is not more than 0.3%. Preferably, the alloy comprises, by mass, mg4.5%, cr3.0%, mn0.5%, sc0.8%, zr0.3%, and the balance of Al and unavoidable impurities, wherein the total content of impurities is not more than 0.3%. Preferably, the alloy comprises, by mass, mg4.5%, cr1.5%, mn0.5%, sc0.8%, zr0.3%, and the balance being Al and unavoidable impurities, wherein the total content of impurities is not more than 0.3%. Preferably, the alloy comprises, by mass, mg4.5%, cr4.5%, mn0.5%, sc0.8%, zr0.3%, and the balance being Al and unavoidable impurities, wherein the total content of impurities is not more than 0.3%. Preferably, the alloy comprises, by mass, mg3.0%, cr3.0%, mn0.5%, sc0.8%, zr0.3%, and the balance of Al and unavoidable impurities, wherein the total content of impurities is not more than 0.3%. Preferably, the alloy comprises, by mass, mg3.0wt%, cr3%, mn 1.5wt%, sc0.8wt%, zr0.3wt%, and the balance being Al and unavoidable impurities, wherein the total content of impurities is not more than 0.3wt%. A preparation method of heat-resistant high-strength corrosion-resistant aluminum alloy powder comprises the following steps: Alloy smelting, namely placing pure aluminum, pure magnesium, pure zirconium, pure manganese, al-Cr interm