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Method of repeatedly using seed crystals to prepare monocrystalline high-temperature alloy

A technology of superalloy and seed crystal, applied in the field of preparation of single crystal superalloy, can solve the problems of failure of single crystal orientation control, miscellaneous crystal, unreusable seed crystal, etc.

Active Publication Date: 2016-08-10
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the disadvantages in the prior art that miscellaneous crystals are easily formed in the remelting zone of the seed crystal, the single crystal orientation control may fail, and the seed crystal cannot be reused when preparing a single crystal, the present invention proposes a method for repeatedly using the seed crystal to prepare a single crystal superalloy method

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  • Method of repeatedly using seed crystals to prepare monocrystalline high-temperature alloy
  • Method of repeatedly using seed crystals to prepare monocrystalline high-temperature alloy
  • Method of repeatedly using seed crystals to prepare monocrystalline high-temperature alloy

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Embodiment 1

[0033] This embodiment is a method of repeatedly using seed crystals to prepare a single crystal superalloy test rod having a [001] orientation deviated from the axial direction by an angle of α, and the number of superalloy test rods to be prepared is multiple. The number of superalloy test rods to be prepared in this embodiment is 2, and the [001] orientation of the seed crystal in this embodiment deviates from the axial direction by 0 degrees.

[0034] The concrete steps of this embodiment are as follows:

[0035] The first step is to make a mold shell for pre-embedding the corundum tube in the seeding section. The mold shell is composed of a casting segment 1, a crystal selection segment 2 and a seeding segment 3, and one end of the crystal selection segment 2 is connected to one end of the casting segment 1, and the other end of the crystal selection segment 2 is connected to the seeding segment 3 one end of the connection. The corundum tube 4 is placed in the seeding seg...

Embodiment 2

[0045] This embodiment is a method of repeatedly using seed crystals to prepare a single crystal superalloy test rod having a [001] orientation deviated from the axial direction by an angle of α, and the number of superalloy test rods to be prepared is multiple. The number of superalloy test rods to be prepared in this embodiment is 4, and the [001] orientation of the seed crystal deviates from the axial direction by 4 degrees in this embodiment.

[0046] The concrete steps of this embodiment are as follows:

[0047] The first step is to make a mold shell for pre-embedding the corundum tube in the seeding section. The mold shell is composed of a casting segment 1, a crystal selection segment 2 and a seeding segment 3, and one end of the crystal selection segment 2 is connected to one end of the casting segment 1, and the other end of the crystal selection segment 2 is connected to the seeding segment 3 one end of the connection. The corundum tube 4 is placed in the seeding s...

Embodiment 3

[0059] This embodiment is a method of repeatedly using seed crystals to prepare a single crystal superalloy test rod having a [001] orientation deviated from the axial direction by an angle of α, and the number of superalloy test rods to be prepared is multiple. The number of superalloy test bars to be prepared in this embodiment is 8, and the [001] orientation of the seed crystal deviates from the axial direction by 7 degrees in this embodiment.

[0060] The concrete steps of this embodiment are as follows:

[0061] The first step is to make a mold shell for pre-embedding the corundum tube in the seeding section. The mold shell is composed of a casting segment 1, a crystal selection segment 2 and a seeding segment 3, and one end of the crystal selection segment 2 is connected to one end of the casting segment 1, and the other end of the crystal selection segment 2 is connected to the seeding segment 3 one end of the connection. The corundum tube 4 is placed in the seeding s...

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Abstract

The invention discloses a method of repeatedly using seed crystals to prepare a monocrystalline high-temperature alloy. On the premise that the monocrystalline high-temperature alloy in needed orientation is ensured to be obtained, the seed crystals are used repeatedly, so that trouble of preparing brand-new seed crystals when the monocrystalline high-temperature alloy is produced by a seed crystal method at each time is avoided, and production cost is lowered remarkably. Studies on a seed crystal melting-back area misoriented crystal forming mechanism find that surface coarseness of the inner wall of a formwork seeding section and scouring of the seed crystals during alloy pouring are important factors which are neglected for a long time and have influence on misoriented crystals. By the method, the surface coarseness of the inner wall of the formwork seeding section can be lowered, speed of scouring the seed crystals during alloy pouring can be reduced, and forming of misoriented crystals in a melting-back area can be avoided effectively.

Description

technical field [0001] The invention relates to the field of preparation of single-crystal high-temperature alloys, in particular to a method for pre-embedding corundum tubes in the seeding section of a mold shell to suppress the formation of miscellaneous crystals in the remelting zone of seed crystals, and realize the method of repeatedly using seed crystals to produce single-crystal high-temperature alloys. Background technique [0002] In order to improve the temperature and thrust-to-weight ratio before the turbine of the aero-engine, the turbine blades have basically been prepared by single crystal technology. The mechanical properties of single crystal superalloys have obvious anisotropy, and the best thermal fatigue performance can be obtained when the [001] direction of the crystal is consistent with the maximum force direction of the blade. At present, the methods for obtaining single crystals include crystal selection method and seed crystal method. The crystal s...

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 刘林胡松松黄太文张军杨文超苏海军郭敏傅恒志
Owner NORTHWESTERN POLYTECHNICAL UNIV
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