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A method for repeatedly using solid solution columnar crystals to produce single crystal superalloys

A technology of superalloy and columnar crystal is applied in the field of reusing solid solution columnar crystal to make single crystal superalloy. success rate effect

Active Publication Date: 2022-04-08
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for repeatedly using solid solution state columnar crystals to produce single crystal superalloys, so as to solve the technical problems of excessive crystal orientation deviation and high preparation cost when preparing single crystal superalloys by crystal selection method in the prior art

Method used

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  • A method for repeatedly using solid solution columnar crystals to produce single crystal superalloys
  • A method for repeatedly using solid solution columnar crystals to produce single crystal superalloys
  • A method for repeatedly using solid solution columnar crystals to produce single crystal superalloys

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Experimental program
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Effect test

Embodiment 1

[0036] Preparation of Ni-14Mo-7Al single crystal superalloy rods, the specific steps are:

[0037] The first step is to prepare the wax mold of the spiral crystal selector. Melt the wax material at a temperature of 75°C and inject it into the mold of the part, and press it under a pressure of 0.5MPa to make a wax mold of the part; put the wax material at 75°C After being melted at a temperature of 100%, it is injected into the mold of the spiral crystal selector, and pressed under a pressure of 0.5MPa to obtain a wax mold of the spiral crystal selector; the wax mold of the spiral crystal selector includes two parts: a spiral section and a crystal initiation section;

[0038] In the second step, insert the corundum tube with the same length as the crystal opening section of the spiral crystal selector wax mold into the crystal opening section of the spiral crystal selector wax mold, and fill the corundum tube and the spiral crystal selector wax mold with molten wax The gap betw...

Embodiment 2

[0048] To prepare Ni-13.5Mo-7.6 Al-0.05B ​​single crystal superalloy rods, the specific steps are:

[0049] The first step is to prepare the wax mold of the spiral crystal selector. Melt the wax material at a temperature of 100°C and inject it into the mold of the part, and press it under a pressure of 8MPa to make a wax mold of the part; put the wax material at 100°C After melting at high temperature, pour it into the mold of the spiral crystal selector, and press it under a pressure of 8 MPa to obtain a wax mold of the spiral crystal selector; the wax mold of the spiral crystal selector includes two parts: a spiral section and a crystal initiation section;

[0050] In the second step, insert the corundum tube with the same length as the crystal opening section of the spiral crystal selector wax mold into the crystal opening section of the spiral crystal selector wax mold, and fill the corundum tube and the spiral crystal selector wax mold with molten wax The gap between the ...

Embodiment 3

[0060] Prepare Ni-12Mo-7.2Al-0.02B single crystal superalloy casting, its specific steps are:

[0061] The first step is to prepare the wax mold of the spiral crystal selector. Melt the wax material at a temperature of 80°C and inject it into the mold of the part, and press it under a pressure of 5MPa to make a wax mold of the part; put the wax material at 80°C After melting at high temperature, pour it into the mold of the spiral crystal selector, and press it under a pressure of 5MPa to obtain a wax mold of the spiral crystal selector; the wax mold of the spiral crystal selector includes two parts: a spiral section and a crystal initiation section;

[0062] In the second step, insert the corundum tube with the same length as the crystal opening section of the spiral crystal selector wax mold into the crystal opening section of the spiral crystal selector wax mold, and fill the corundum tube and the spiral crystal selector wax mold with molten wax The gap between the segments...

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Abstract

A method for producing single-crystal superalloys by repeatedly using solid-solution state columnar crystals of the present invention, by inserting a corundum tube with the same length as the crystal-opening section of the wax mold of the spiral crystal selector into the crystal opening section of the wax mold of the spiral crystal selector Filling the gap between the corundum tube and the crystal initiation section with molten wax material can effectively avoid the possibility of the single crystal superalloy entering the gap between the ceramic mold shell and the unmelted single crystal due to pouring, resulting in the formation of miscellaneous crystals due to chilling; in the part wax The mold, the spiral crystal selector wax mold and the corundum tube are coated with ceramic refractory slurry, which can improve the refractory performance of the formed ceramic mold shell. The invention can not only be smaller than the deviation range of controlling the crystal orientation of single crystal superalloys by the current crystal selection method, but also realize the repeated use of solid solution state columnar crystals to prepare single crystals, improve the success rate of single crystal preparation, and reduce the cost of single crystal orientation control.

Description

technical field [0001] The invention relates to the field of nickel-based single crystal manufacturing, in particular to a method for repeatedly using solid solution state columnar crystals to manufacture single crystal superalloys. Background technique [0002] Nickel-based single crystal superalloys have excellent high-temperature comprehensive properties and are the preferred materials for aeroengine turbine blades. Their mechanical properties have significant anisotropy. During the preparation of single crystal blades, the <001> direction needs to be controlled within a certain range. The single crystal blade has a longer service life. At present, in industrial production, single crystal superalloys are mainly prepared by crystal selection method and seed crystal method. The crystal grains selected by the crystal selection method have a certain degree of randomness, and usually only the axial deviation of the crystal orientation and the casting can be controlled w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/04B22C3/00B22D27/04C30B11/00C30B29/52
CPCB22C9/04B22C3/00B22D27/045C30B29/52C30B11/00
Inventor 杨振宇郑帅郑素杰杨功张剑骆宇时戴圣龙
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS