Method for preparing single crystal high temperature alloy block material through laser 3D printing

A high-temperature alloy and 3D printing technology, which is applied in the growth of polycrystalline materials, single crystal growth, crystal growth, etc., can solve the problems of high cost and complicated single crystal blade forming process, and achieve the effect of improving the thrust-to-weight ratio.

Inactive Publication Date: 2015-09-30
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Moreover, due to the complex forming process of the single crystal blade, it also contains a large amount of precious metal elements, resulting in high cost

Method used

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  • Method for preparing single crystal high temperature alloy block material through laser 3D printing
  • Method for preparing single crystal high temperature alloy block material through laser 3D printing
  • Method for preparing single crystal high temperature alloy block material through laser 3D printing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Firstly, a wax mold is prepared, and then ceramic refractory slurry is coated on the outside of the wax mold, and a ceramic mold shell with seed crystals is obtained through dewaxing and roasting. The nickel-based superalloy master alloy (brand SRR99) was melted and refined in the crucible of the vacuum single crystal furnace, and then poured into the ceramic mold shell. pull. After the mold shell is cooled to room temperature, the shell can be cleaned to obtain a nickel-based single crystal superalloy. The substrate is cut by wire cutting on the single crystal matrix, and the angle between the normal direction of the substrate surface and the direction is about 3°. In the second step, the base material is at room temperature, and the surface of the single crystal superalloy base material is remelted by laser with a laser power of 700w and a scanning speed of 300mm / min, and a metallographic microscope is used to observe the remelted structure. remelted microstructure...

Embodiment 2

[0032] Firstly, a wax mold is prepared, and then ceramic refractory slurry is coated on the outside of the wax mold, and a ceramic mold shell with seed crystals is obtained through dewaxing and roasting. The nickel-based superalloy master alloy (brand SRR99) was melted and refined in the crucible of the vacuum single crystal furnace, and then poured into the ceramic mold shell. pull. After the mold shell is cooled to room temperature, the shell can be cleaned to obtain a nickel-based single crystal superalloy. The substrate is cut by wire cutting on the single crystal matrix, and the angle between the normal direction of the substrate surface and the direction is about 15°. In the second step, the substrate is preheated to 200°C, and the surface of the single crystal superalloy substrate is remelted by laser. The laser power is 1500w, the scanning speed is 900mm / min, and the remelted structure is observed with a metallographic microscope. remelted microstructure such as F...

Embodiment 3

[0036] Firstly, a wax mold is prepared, and then ceramic refractory slurry is coated on the outside of the wax mold, and a ceramic mold shell with seed crystals is obtained through dewaxing and roasting. The nickel-based superalloy master alloy (brand DD99) was melted and refined in the crucible of the vacuum single crystal furnace, and then poured into the ceramic mold shell. pull. After the mold shell is cooled to room temperature, the shell can be cleaned to obtain a nickel-based single crystal superalloy. The substrate is cut by wire cutting on the single crystal matrix, and the angle between the normal direction of the substrate surface and the direction is about 2°. In the second step, the substrate is preheated to 400°C, and the surface of the single crystal superalloy substrate is remelted with a laser, the laser power is 2500w, and the scanning speed is 2000mm / min, and the remelted structure is observed with a metallographic microscope. remelted microstructure such...

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Abstract

The invention discloses a method for preparing a single crystal high temperature alloy block material through laser 3D printing and belongs to the technical fields of single crystal solidification and laser rapid forming. The method for preparing the single crystal high temperature alloy block material through the laser 3D printing comprises the following steps: firstly cutting a base material used for the laser 3D printing from a single crystal high temperature alloy material, then preheating the cut base material, carrying out surface remelting on the cut base material, and then observing a remelting microscopic structure; and based on a remelting technique, preparing the single crystal high temperature alloy block material through the laser 3D printing under the conditions that the base material is preheated to 0-800 DEG C, laser power is 200-500w, scanning speed is 30-3000mm / min, and powder feeding rate is 0.3-30g / min. The single crystal high temperature alloy prepared through the laser 3D printing can be used for developing a single crystal blade repairing technology and can also be used for developing a new single crystal high temperature alloy blade process.

Description

Technical field: [0001] The invention relates to the fields of single crystal solidification technology and laser rapid prototyping technology, in particular to a method for preparing a single crystal superalloy bulk material by laser 3D printing on a single crystal superalloy substrate. Background technique: [0002] The most direct way to develop high-thrust, high-efficiency, and low-fuel-consumption aeroengines is to increase the gas inlet temperature before the turbine. The increase in gas inlet temperature directly depends on the increase in the temperature-bearing capacity of the turbine blades. The temperature gradient of the traditional directional solidification process is very limited, and the dendrites of the prepared single crystal superalloy are thick, and the interdendritic element segregation is serious. The development of a new single crystal preparation process is of great significance for improving the properties of single crystal superalloys. [0003] Mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B1/00C30B29/52B22F3/105
Inventor 王国伟周亦胄梁静静刘纪德金涛孙晓峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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