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Crystal selection method for accurately controlling single-crystal orientation

A precise control, single crystal technology, applied in the direction of single crystal growth, single crystal growth, chemical instruments and methods, etc., can solve problems such as the inability to precisely control the orientation of single crystal superalloys

Active Publication Date: 2017-08-18
苏州高晶新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiency that the existing crystal selection method cannot precisely control the orientation of the single crystal superalloy in the preparation of the single crystal superalloy, the present invention proposes a crystal selection method for precisely controlling the orientation of the single crystal

Method used

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  • Crystal selection method for accurately controlling single-crystal orientation
  • Crystal selection method for accurately controlling single-crystal orientation
  • Crystal selection method for accurately controlling single-crystal orientation

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0021] This example is a method for preparing a single crystal superalloy sample with a primary dendrite orientation deviating from the axial direction by an angle α, and a secondary dendrite orientation deviating from the casting airfoil normal direction by an angle β. In this embodiment, α=0°, β=45°.

[0022] The concrete steps of this embodiment are:

[0023] The first step is to make the mold shell: use wax, use 3D printing to prepare spiral-shaped crystal selection segments, and use molds to prepare cylindrical seed segments and castings. The two ends of the crystal selection section are heated and respectively welded to the seeding section and the casting to obtain a complete wax model. A shell for casting with the same structure as the prior art is obtained by using a standard investment casting shell making process. After the mold shell is completely dewaxed, it is washed with water and dried in a drying oven for later use. The diameter of the seeding segment is 9 m...

Embodiment 2

[0027] This example is a method for preparing a single crystal superalloy sample with a primary dendrite orientation deviating from the axial direction by an angle α, and a secondary dendrite orientation deviating from the casting airfoil normal direction by an angle β. In this embodiment, α=3° and β=25°.

[0028] The concrete steps of this embodiment are:

[0029] The first step is to make the mold shell: use wax, use 3D printing to prepare spiral-shaped crystal selection segments, and use molds to prepare cylindrical seed segments and castings. The two ends of the heated crystal selection section are respectively welded to the seeding section and the casting to obtain a complete wax model. A shell for casting with the same structure as the prior art is obtained by using a standard investment casting shell making process. After the mold shell is completely dewaxed, it is washed with water and dried in a drying oven for later use. Among them, the seeding section has a diame...

Embodiment 3

[0033] This example is a method for preparing a single crystal superalloy sample with a primary dendrite orientation deviating from the axial direction by an angle α, and a secondary dendrite orientation deviating from the casting airfoil normal direction by an angle β. In this embodiment, α=5° and β=0°.

[0034] The concrete steps of this embodiment are:

[0035] The first step is to make the mold shell: use wax, use 3D printing to prepare spiral-shaped crystal selection segments, and use molds to prepare cylindrical seed segments and castings. The two ends of the crystal selection section are heated and respectively welded to the seeding section and the casting to obtain a complete wax model. A shell for casting with the same structure as the prior art is obtained by using a standard investment casting shell making process. After the mold shell is completely dewaxed, it is washed with water and dried in a drying oven for later use. The diameter of the seeding segment is 1...

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Abstract

The invention relates to a crystal selection method for accurately controlling single-crystal orientation. The crystal selection method comprises the following steps: putting short seed crystals into a mold shell, and forming an include angle of 0-45 degrees between secondary dendritic crystal orientation of the short seed crystals and a normal direction of a casting leaf body; and pouring melt mother alloy into a mold shell, maintaining the temperature, and drawing downwards at a speed of 50um / s-100um / s so as to obtain a single-crystal orientated single-crystal high-temperature alloy sample after the crystal drawing is finished. The primary dendritic crystal orientation of the prepared single-crystal high-temperature alloy sample deviates from the axial direction by an angle alpha, and the secondary dendritic crystal orientation deviates from the normal direction of the casting leaf body by an angle beta, wherein alpha is equal to 0-5 degrees, and beta is equal to 0-45 degrees.

Description

technical field [0001] The invention relates to the field of preparation of single-crystal high-temperature alloys, in particular to a crystal selection method for precisely controlling single-crystal orientation through the assistance of reusable short seed crystals. Background technique [0002] Because of their excellent high-temperature mechanical properties, nickel-based single crystal superalloys are widely used as aeroengine blade materials. The mechanical properties of single crystal superalloys have significant anisotropy. The best thermal fatigue performance can be obtained when the primary dendrite orientation of the crystal is consistent with the principal stress direction of the blade, and the secondary dendrite orientation of the crystal also has an effect on the performance of the blade. Obviously, it is desirable to be able to control the primary and secondary dendrite orientations during the preparation of single crystal superalloys. At present, the methods...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/52C30B11/14B22D27/04
CPCB22D27/045C30B11/14C30B29/52
Inventor 刘林胡松松杨文超黄太文张军苏海军
Owner 苏州高晶新材料科技有限公司
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