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Method for preparing single-crystal high-temperature alloy from seed crystal subjected to solid-solution treatment

A high-temperature alloy and solution treatment technology, applied in the direction of self-solidification, single crystal growth, single crystal growth, etc., can solve the problems of increased preparation cost, mechanization degree of mold shell preparation and overall precision reduction, etc., to improve the degree of mechanization and The effect of assembly accuracy, simplified structure and cost reduction

Active Publication Date: 2018-10-09
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 problems in the prior art that the degree of mechanization and the overall accuracy of the mold shell preparation are reduced and the preparation cost is increased when the spiral crystal selection section is used to suppress the formation of miscellaneous crystals below the remelting interface inside the seed crystal, the present invention proposes a Method for preparing single crystal superalloy from solution treated seed crystal

Method used

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  • Method for preparing single-crystal high-temperature alloy from seed crystal subjected to solid-solution treatment
  • Method for preparing single-crystal high-temperature alloy from seed crystal subjected to solid-solution treatment
  • Method for preparing single-crystal high-temperature alloy from seed crystal subjected to solid-solution treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This example is a method for preparing three nickel-based single crystal superalloy blade samples with a orientation deviation angle of 0° by using solution treated seed crystals.

[0044] The nickel-based single crystal superalloy is composed of Cr, Mo, Al, Co, W, Ti, C, B and Ni, wherein: the alloy composition is 9.5% for Cr, 4.0% for Mo, 5.8% for Al, and 5.8% for Ti. 2.0, Co is 5.0%, W is 5.5%, C≤0.02%, B≤0.02%, and the rest is Ni. The stated percentages are all mass percentages.

[0045] The concrete process of this embodiment is:

[0046] Step 1, solid solution treating the single crystal preform.

[0047] An analysis sample was cut out from the single crystal preform, and the average primary dendrite spacing of the analysis sample was determined to be 273 μm using a metallographic microscope. Use a synchronous thermal analyzer to determine that the initial melting temperature of the analyzed sample is 1278°C, and the solidus temperature is 1321°C, with 1268°C ...

Embodiment 2

[0065] This example is to prepare 4 nickel-based single crystal superalloy plate samples with a orientation deviation angle of 15°. The alloy is composed of Cr, Mo, Al, Co, W, Re, Ta, Hf, C, B and Ni composition, wherein: the alloy composition is 4.3% of Cr, 9.0% of Co, 2.0% of Mo, 8.0% of W, 7.5% of Ta, 2.0% of Re, 5.6% of Al, 0.1% of Hf, and Ti of 1.0%, C≤0.02%, B≤0.02%, the rest is Ni. The stated percentages are all mass percentages.

[0066] The specific steps are:

[0067] Step 1, solid solution treating the single crystal preform.

[0068] An analysis sample was cut from the single crystal preform, and the average primary dendrite spacing of the analysis sample was determined to be 269 μm using a metallographic microscope. Use a synchronous thermal analyzer to measure the initial melting temperature of the analyzed sample to be 1290°C, the solidus temperature to be 1331°C, take 1280°C as the lower limit of the solution treatment temperature range, and take 1321°C as ...

Embodiment 3

[0086] This example is to prepare 5 rod-shaped samples of nickel-based single crystal superalloy with orientation deviation angle of 40°, the alloy is composed of Cr, Mo, Al, Co, W, Re, Ta, Hf, C and Ni, Among them: the alloy composition is 3% of Cr, 1% of Mo, 6% of Al, 12% of Co, 6% of W, 4% of Re, 12% of Ta, 0.2% of Hf, C≤0.02%, B≤0.02%, the rest is Ni. The stated percentages are all mass percentages.

[0087] The specific steps are:

[0088] The concrete process of this embodiment is:

[0089] Step 1, solid solution treating the single crystal preform.

[0090] An analysis sample was cut from the single crystal preform, and the average primary dendrite spacing of the analysis sample was determined to be 276 μm using a metallographic microscope. Use a synchronous thermal analyzer to determine that the initial melting temperature of the analyzed sample is 1303°C, and the solidus temperature is 1344°C, with 1293°C as the lower limit of the solution treatment temperature r...

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Abstract

The invention discloses a method for preparing single-crystal high-temperature alloy from seed crystal subjected to solid-solution treatment. The method is characterized in that the original structurestate of seed crystal is converted into a uniform structure from a thick seed crystal structure through a solid-solution thermal treatment way, so that a structure on the upper part of a mushy zone under a melting-back interface forms a complex network shaped structure in a seed crystal single-crystal preparation process; un-melted solid phases are connected with each other to improve ability ofresisting deformation, so that flow speed when melt is poured to the upper end of the seed crystal does not need to limit, and therefore, the purpose of removing a spiral crystal selector structure ina mould shell is achieved. In a process of preparing the single-crystal high-temperature alloy, the seed crystal re-melting region is completely inhibited to form mixed crystal, so that the structureof the corresponding mould shell is simplified, mechanical degree and assembly precision of shell making are improved, and cost is reduced, and therefore, the defect of using a spiral crystal selecting section in the mould shell in a process of producing single-crystal high-temperature alloy by repeatedly using seed crystal is avoided.

Description

technical field [0001] The invention relates to the field of preparation of single-crystal high-temperature alloys, in particular to a method for preparing single-crystal high-temperature alloys by putting solid-solution-treated seed crystals into mold shells of pre-embedded corundum tubes. 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 comprehensive mechanical properties can be obtained when the <001> direction of the crystal is consistent with the maximum force direction of the blade, and the single crystal needs to be prepared by the seed crystal method. [0003] The equipment used to prepare single crystal superalloys in industrial production is mainly the Bridgman directional solidification furnace. The temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/52C30B11/14C22C1/02C22C19/05
CPCC22C1/023C22C19/057C30B11/14C30B29/52
Inventor 刘林胡松松杨文超李卓然杨敏黄太文苏海军郭敏张军甘斌傅恒志
Owner NORTHWESTERN POLYTECHNICAL UNIV
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