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Method for orientated growth of superfine columnar crystal by adopting laser direct forming technology

A technology of laser direct forming and directional growth, which is applied in the directions of crystal growth, single crystal growth, chemical instruments and methods, etc., and can solve the problems of many heterocrystalline regions and discontinuous growth of oriented columnar crystal structures.

Inactive Publication Date: 2014-06-18
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of discontinuous growth of directional columnar crystal structure and many miscellaneous crystal regions in the existing laser direct forming directional solidification technology, the purpose of the present invention is to provide a method for promoting the growth of directional columnar crystals in laser direct forming by heating the substrate , not only the growth of oriented columnar crystals is continuous, but also the primary spacing of dendrites is very small, which can reach the standard of ultra-fine columnar crystals

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  • Method for orientated growth of superfine columnar crystal by adopting laser direct forming technology
  • Method for orientated growth of superfine columnar crystal by adopting laser direct forming technology
  • Method for orientated growth of superfine columnar crystal by adopting laser direct forming technology

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example 1

[0022] 1. Material selection for laser direct forming directional solidification solid parts: the metal powder used in the experiment is DZ125L nickel-based superalloy powder used in aero-engine blades, the powder particle size is 30-60 μm, and the directional solidification substrate material is cast nickel-based superalloy directional solidification substrate .

[0023] 2. Before the experiment, heat the powder in a vacuum drying oven to 150°C and keep it warm for 24 hours to remove moisture and enhance the fluidity of the powder; after the surface of the directional solidification substrate is polished with fine sandpaper, remove grease and stains with acetone, and then use ethanol Wash and dry.

[0024] 3. The forming process adopts the filling and scanning method, that is, scanning the outer contour first and then filling the inside. Laser multi-layer forming is performed on the preferred crystal plane (001) of the oriented substrate. The main process parameters are laser...

example 2

[0027] 1. In order to further verify the extensiveness of the experiment, other nickel-based superalloys were used for experiments. Material selection for forming solid parts: The metal powder used in the experiment is FGH96 nickel-based superalloy, the powder particle size is 50-100 μm, and the substrate material is a cast nickel-based superalloy directional solidification substrate.

[0028] 2. Before the experiment, heat the powder in a vacuum drying oven to 150°C and keep it warm for 24 hours to remove moisture and enhance the fluidity of the powder; after the surface of the substrate is polished with fine sandpaper, remove grease and stains with acetone, then clean with ethanol and dry dry.

[0029] 3. The forming process adopts the filling and scanning method, that is, scanning the outer contour first and then filling the inside, and performing laser multi-channel multi-layer forming on the preferred crystal plane (001) of the oriented substrate. The main process paramet...

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Abstract

The invention discloses a method for orientated growth of a superfine columnar crystalby adopting a laser direct forming technology. The method is characterized in that a directional solidification substrate heating mode is adopted; meanwhile, the laser direct forming is controlled for the orientated growth of the superfine columnar crystal by adopting low-power and small single-layer lifting capacity in the process and the problem that the orientated growth of part of columnar crystal is discontinuous or turns for growing existing in a laser direct forming directional solidification technology is solved; by adopting the substrate heating mode, the temperature gradient in a laser molten pool is properly reduced, the orientated growth interval of the columnar crystal is still controlled to keep great-enough temperature gradient and the supercooling degree required by growing the columnar crystal is met; in addition, due to the utilization of the substrate heating mode, the temperature of the molten pool is increased, the surface stress of the molten pool is reduced, the morphology of the whole molten pool is more tiled and the growth of the columnar crystal is better facilitated; a technological base is provided for producing metal parts having directional solidification organizations with different sizes and shapes by laser direct forming.

Description

technical field [0001] The present invention relates to laser additive manufacturing technology, in particular to a method for preparing continuous oriented columnar crystal structure through laser direct forming and substrate heating, which is mainly used to solve the problem of discontinuous growth of oriented columnar crystal structure existing in laser direct forming directional solidification technology question. Background technique [0002] As a new technology subverting the traditional manufacturing industry, 3D printing technology is regarded as the third industrial revolution, which has set off an upsurge of research and application worldwide. Laser Direct Forming (LDF) is one of the most potential 3D printing technologies. It is a flexible advanced manufacturing method developed based on rapid prototyping technology and laser cladding technology. It integrates the advantages of laser cladding technology and rapid prototyping technology, and can directly manufactu...

Claims

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Application Information

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IPC IPC(8): B22F3/105C30B11/00
CPCY02P10/25
Inventor 张安峰李涤尘张海洋齐宝路师博飞
Owner XI AN JIAOTONG UNIV