Method for eliminating re-crystallization tendency of laser 3D printed single-crystal high-temperature alloy

A technology of 3D printing and high-temperature alloys, which is applied in the direction of single crystal growth, single crystal growth, chemical instruments and methods, etc., to achieve the effect of eliminating the tendency of recrystallization

Active Publication Date: 2017-09-01
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the residual stress after laser forming leads to recrystallization, and 3D printed single crystal parts cannot meet the needs of actual production.

Method used

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  • Method for eliminating re-crystallization tendency of laser 3D printed single-crystal high-temperature alloy
  • Method for eliminating re-crystallization tendency of laser 3D printed single-crystal high-temperature alloy
  • Method for eliminating re-crystallization tendency of laser 3D printed single-crystal high-temperature alloy

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Experimental program
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Embodiment 1

[0054] This example is to eliminate its recrystallization tendency in the process of laser 3D printing superalloy DD499. Laser 3D printing with coaxial powder feeding is performed on a single crystal superalloy substrate with a length of 2 cm × width of 1 cm × height of 1 cm. The surface of the substrate is the crystallographic [001] plane. During the laser forming process, the thickness of the printing layer is lower than the growth height of the dendrites in the [001] direction, and the pass spacing is smaller than the area width of the dendrites in the [001] direction. Print layer thickness and pass spacing to ensure the success of epitaxial growth. The sample uses an in-situ preheating process during the printing process, so that the preheating temperature in the low-temperature area of ​​the sample is higher than 950°C during the printing process, and the temperature gradient in the sample during the printing process is about 150K / cm. Such as image 3 As shown, the dend...

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Abstract

The invention discloses a method for eliminating re-crystallization tendency of a laser 3D printed single-crystal high-temperature alloy, belonging to the field of manufacturing of laser additives and preparation of the single-crystal high-temperature alloy. By utilizing laser 3D printing as a production technology, the epitaxial growth of the laser-formed dendritic structure on a single-crystal high-temperature alloy base material can be realized through controlling technological parameters. In addition, the temperature field of the printing process is controlled so that the residual stress of the 3D printed single-crystal high-temperature alloy parts is at a lower level, and the re-crystallization tendency of the laser 3D printed single-crystal high-temperature alloy is thoroughly eliminated. The method can be used for preparing large-size single-crystal high-temperature alloy without re-crystallization tendency, and single-crystal high-temperature alloy blades can be prepared by using laser 3D printing on the basis.

Description

[0001] Technical field: [0002] The invention relates to the fields of laser additive manufacturing and preparation of single crystal superalloys, in particular to a method for eliminating the recrystallization tendency of laser 3D printing single crystal superalloys. [0003] Background technique: [0004] Superalloys have been widely used in aero-engines and gas turbines due to their excellent high-temperature mechanical properties. Compared with polycrystalline superalloys and oriented superalloys, single crystal superalloys have more excellent high-temperature comprehensive mechanical properties. Thanks to its better high-temperature performance, single-crystal superalloys can be used in core components that require more stringent high-temperature performance, such as turbine blades. [0005] With the development of composition design and processing technology of single crystal superalloys, the high temperature mechanical properties of single crystal superalloys are gradu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/52C30B1/00B33Y10/00
CPCB33Y10/00C30B1/00C30B29/52
Inventor 周亦胄王国伟梁静静杨彦红金涛孙晓峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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