CN-121972684-A - High-density laser powder bed fused refractory superalloy and preparation method and application thereof

Abstract

The invention discloses a high-density laser powder bed fused refractory superalloy, a preparation method and application thereof. The preparation method comprises the steps of taking alloy powder as a raw material, adopting a double-laser-beam laser powder bed melting technology to prepare a refractory high-temperature alloy, wherein a laser heat source of a first laser beam is Gaussian in distribution, the laser volume energy density is 40-55J/mm 3 , a laser heat source of a second laser beam is flat top light or transverse elliptical light, the laser volume energy density is 30-40J/mm 3 , and the starting time interval of the first laser beam and the second laser beam is 0.15-0.25 s. According to the invention, the second laser is introduced into the laser powder bed melting technology, and the type and the interval time of the second laser are adjusted and optimized, so that the large-size printing defect is annihilated in situ, the forming quality of the high-temperature alloy difficult to weld is obviously improved, and a new solution is provided for preparing the high-performance high-density alloy.

Inventors

• PU JIBIN
• HE XING
• ZHANG HAO

Assignees

• 中国科学院宁波材料技术与工程研究所

Dates

Publication Date

20260505

Application Date

20260202

Claims (10)

1. 1. A preparation method of a high-density laser powder bed fused refractory superalloy is characterized by taking alloy powder as a raw material, adopting a double-laser-beam laser powder bed fusion technology to prepare the refractory superalloy, wherein the laser powder bed fusion technology adopts the technological parameters that a laser heat source of a first laser beam is Gaussian distribution, the laser volume energy density is 40-55J/mm 3 , a laser heat source of a second laser beam is flat top light or transverse elliptical beam, the laser volume energy density is 30-40J/mm 3 , and the starting time interval of the first laser beam and the second laser beam is 0.15-0.25 s.
2. 2. The method according to claim 1, wherein the alloy powder comprises a nickel-based alloy powder, and preferably the nickel-based alloy powder has a particle size distribution of 15-53. Mu.m.
3. 3. The method according to claim 1, wherein the laser powder bed melting technology adopts the technological parameters that the laser power of the first laser beam is 270-300W, the scanning speed is 1400-1600 mm/s, and the scanning interval is 0.09-0.11 mm.
4. 4. The preparation method according to claim 1, wherein the laser powder bed melting technology adopts the technological parameters that the powder laying layer thickness is 0.03-0.05 mm, the light spot diameter is 0.09-0.11 mm and the interlayer rotation angle is 67 degrees.
5. 5. The preparation method according to claim 1, wherein the laser powder bed melting technology adopts the technological parameters that the laser power of the second laser beam is 200-220W, the scanning speed is 1400-1600 mm/s, the scanning interval is 0.09-0.11 mm, the spot diameter is 0.09-0.11 mm, and the interlayer rotation angle is 67 degrees.
6. 6. The method of claim 1, wherein the laser source of the second laser beam is a flat top beam.
7. 7. A refractory superalloy melted by a high density laser powder bed produced by the production process of any of claims 1-6.
8. 8. The method of claim 7, wherein the refractory superalloy has a relative density of 99.85% or greater.
9. 9. The method of claim 8, wherein the refractory superalloy has a relative density of 99.89% or more, preferably 99.96% or more.
10. 10. Use of a high density laser powder bed melted refractory superalloy as claimed in any of claims 7 to 9 in the manufacture of a high temperature component in the aerospace or energy power field.

Description

High-density laser powder bed fused refractory superalloy and preparation method and application thereof Technical Field The invention belongs to the technical field of additive manufacturing of metal materials, and particularly relates to a high-density laser powder bed-fused refractory superalloy, a preparation method and application thereof. Background The laser powder bed melting (LPBF) technology is used as an advanced additive manufacturing means, has important application value in the manufacturing of high-temperature components in the fields of aerospace, energy power and the like, and is particularly suitable for the integrated forming of high-temperature alloy components with complex structures and difficult welding. However, due to the high gamma' phase content and high alloying characteristics of the alloy, cracks, pores and unfused defects are extremely easy to generate in the traditional Gaussian single laser LPBF process, so that the density of a formed part is insufficient, and the service performance of the formed part in a high-temperature high-pressure environment is severely restricted. Therefore, development of a novel LPBF preparation process is urgently needed, the compactness and mechanical properties can be synchronously optimized, and the forming effects of high compactness, low defects and controllable properties are realized in high-temperature alloys difficult to weld. Disclosure of Invention The invention mainly aims to provide a high-density laser powder bed fused refractory superalloy, and a preparation method and application thereof, so as to overcome the defects of the prior art. In order to achieve the purpose of the invention, the technical scheme adopted by the invention comprises the following steps: The embodiment of the invention provides a preparation method of a high-density laser powder bed fused refractory superalloy, which comprises the steps of taking alloy powder as a raw material, adopting a double-laser-beam laser powder bed fusion technology to prepare the refractory superalloy, wherein the laser powder bed fusion technology adopts the technological parameters that a laser heat source of a first laser beam is Gaussian distribution, the laser volume energy density is 40-55J/mm 3, a laser heat source of a second laser beam is flat top light or transverse elliptical beam, the laser volume energy density is 30-40J/mm 3, and the starting time interval of the first laser beam and the second laser beam is 0.15-0.25 s. The embodiment of the invention also provides the refractory superalloy melted by the high-density laser powder bed prepared by the preparation method. The embodiment of the invention also provides application of the high-density laser powder bed melted refractory superalloy in manufacturing of high-temperature components in the field of aerospace or energy power. Compared with the prior art, the preparation method of the high-density laser powder bed molten nickel-based superalloy has the advantages that extremely high density (d is more than or equal to 99.96%) is achieved, active intervention and optimization of a defect forming process are achieved in an unfused defect energy density window (40-55J/mm < 3 >) through accurate regulation and control of a second laser beam (flat-top light/transverse elliptical beam) and starting time sequence (0.15-0.25 s), meanwhile, the method can annihilate large-size defects in situ, synchronous fine optimization of a molten pool structure and fine organization are achieved, comprehensive mechanical properties of the high-temperature alloy difficult to weld are remarkably improved, and an innovative technological solution with high reliability is provided for direct manufacture of high-performance key parts in the fields of aerospace and the like. Drawings In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art. FIG. 1 is a microstructure of a difficult-to-weld superalloy prepared in example 1 of the present invention; FIG. 2 is a microstructure of a difficult-to-weld superalloy prepared in example 2 of the present invention; FIG. 3 is a microstructure of a difficult-to-weld superalloy prepared in example 3 of the present invention; FIG. 4 is a microstructure of the refractory superalloy prepared in comparative example 1 of the present invention; FIG. 5 is a microstructure of the refractory superalloy prepared in comparative example 2 of the present invention; FIG. 6 is a microstructure of the refractory superalloy prepared in comparative example 3 of the present invention; FIG. 7