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Solid solution heat treatment method for reducing solid solution hole content of high-rhenium nickel-based single crystal superalloy

A technology of solid solution heat treatment and superalloy, which is applied in the field of heat treatment, can solve the problems of a large number of solid solution pores in the alloy, increase the production cost of the alloy, and reduce the segregation coefficient of the alloy, so as to optimize the solution heat treatment process, increase the initial melting temperature, and improve The effect of high temperature mechanical properties

Active Publication Date: 2022-03-29
NORTHWESTERN POLYTECHNICAL UNIV
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  • Application Information

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Problems solved by technology

[0007] Chinese Patent Document No. CN201710523008.X "A new process for microstructure and performance optimization of low-rhenium single crystal castings", which records a heat treatment of a low-rhenium nickel-based single crystal superalloy combined with solid solution, hot isostatic pressing and aging treatment Although this method can achieve the purpose of eliminating casting defects such as microporosity and shrinkage cavities in castings and avoid surface recrystallization, it is not suitable for high rhenium single crystal alloys, and solid solution is carried out after hot isostatic pressing The treatment will cause solid solution pores to appear again in the alloy, and the hot isostatic pressing technology is expensive, which increases the production cost of the alloy
[0008] Chinese Patent Document No. CN 113528993 A "A Heat Treatment Method for Nickel-based Single Crystal Superalloy" describes a heat treatment method for DD476 nickel-based single crystal superalloy. %, although this method can achieve the method of reducing the segregation coefficient of the alloy after the three-stage solution heat treatment, but a large number of solid solution holes are generated in the alloy, and incipient melting is easy to occur, forming an incipient melting structure

Method used

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  • Solid solution heat treatment method for reducing solid solution hole content of high-rhenium nickel-based single crystal superalloy
  • Solid solution heat treatment method for reducing solid solution hole content of high-rhenium nickel-based single crystal superalloy
  • Solid solution heat treatment method for reducing solid solution hole content of high-rhenium nickel-based single crystal superalloy

Examples

Experimental program
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Effect test

Embodiment 1

[0063] The composition of high-rhenium nickel-based single crystal superalloy raw materials by mass fraction is: Cr 3.1%-3.7%, Co 9.5%-11.0%, Mo 0.71%-0.75%, W 4.9%-5.5%, Ta 8.1% ~9.3%, Re 4.5%~6.0%, Al 5.6%~6.5%, Hf 0.09%~0.15%, Ti 0.10%~0.16%, and the balance is Ni.

[0064] In the solution heat treatment method of reducing the solid solution pore content of high-rhenium nickel-based single crystal superalloy in this embodiment, the composition of the high-rhenium nickel-based single crystal superalloy is as follows in terms of mass fraction: Cr 3.31%, Co 10.50%, Mo 0.72%, W 5.01%, Ta 8.84%, Re 5.11%, Al 6.00%, Hf 0.11%, Ti 0.10%, and the balance is Ni.

[0065] Exemplarily, 3015g of nickel pellets, 165.5g of chromium pellets, 525g of cobalt pellets, 36g of molybdenum pellets, 250.5g of tungsten pellets, 442g of tantalum pellets, 255.5g of rhenium blocks, and 5.5g of hafnium pellets were put into vacuum induction melting Vacuum melting is carried out in the alumina crucible...

Embodiment 2

[0123] Different from Example 1, the composition of high-rhenium nickel-based single crystal superalloy is as follows in terms of mass fraction: Cr3.1%, Co 9.50%, Mo 0.71%, W 4.9%, Ta 8.1%, Re 4.5%, Al 5.6 %, Hf 0.09%, Ti0.10%, the balance is Ni;

[0124] The refining temperature of the master alloy is 1560°C, the pouring temperature is 1500°C, the temperature of the upper heater is 1500°C, the temperature of the lower heater is 1520°C, and the high-rhenium nickel-based single crystal superalloy is prepared at a drawing rate of 3.4mm / min Casting test bars.

Embodiment 3

[0126] The difference from Example 1 is that the composition of the high-rhenium nickel-based single crystal superalloy is as follows by mass fraction: Cr3.7%, Co 11.0%, Mo 0.75%, W 5.5%, Ta 9.3%, Re 6.0%, Al 6.5 %, Hf 0.15%, Ti0.16%, the balance is Ni;

[0127] The refining temperature of the master alloy is 1580°C, the pouring temperature is 1520°C, the temperature of the upper heater is 1520°C, the temperature of the lower heater is 1540°C, and the high-rhenium nickel-based single crystal superalloy is prepared at a drawing rate of 3.6mm / min Casting test bars.

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Abstract

The invention provides a solid solution heat treatment method for reducing the content of solid solution holes in a high-rhenium nickel-based single crystal superalloy, and belongs to the field of heat treatment technology.The method comprises the steps that alloy raw materials are subjected to vacuum melting, a master alloy ingot is obtained and put into a vacuum induction melting furnace to be remelted; casting by adopting a rapid cooling method and a spiral crystal selection method to prepare a single crystal alloy test bar; cutting the cast high-rhenium nickel-based single-crystal high-temperature alloy test bar casting to obtain a high-rhenium nickel-based single-crystal high-temperature alloy test bar; cutting a small test block from the middle section of the high-rhenium nickel-based single-crystal high-temperature alloy test bar, and carrying out a differential thermal analysis experiment; carrying out homogenization treatment on the high-rhenium nickel-based single-crystal high-temperature alloy test bar; and carrying out high-temperature solution treatment on the homogenized high-rhenium nickel-based single-crystal high-temperature alloy test bar. The heat treatment process is easy to operate and high in feasibility, the content of solid solution holes in the high-rhenium nickel-based single-crystal high-temperature alloy can be greatly reduced, and the structure compactness of the alloy is improved.

Description

technical field [0001] The invention relates to the technical field of heat treatment, in particular to a solution heat treatment method for reducing the solid solution hole content of a high-rhenium nickel-based single crystal superalloy. Background technique [0002] Nickel-based single crystal superalloys are widely used in the preparation of turbine blades for aero-engines and ground gas turbines due to their excellent high-temperature mechanical properties. At present, the nickel-based single crystal superalloy has been successfully applied to the third generation, and the content of rhenium element is the main basis for dividing the alloy generation. , 3wt.%, 6wt.% rhenium elements, the service life and comprehensive mechanical properties of single crystal alloy blades have been significantly improved. [0003] Nickel-based single crystal superalloys are mainly composed of γ matrix phase and γ' strengthening phase. Due to the uneven distribution of components and stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/52C30B33/02C30B11/00C22C19/05C22C1/02
CPCC30B29/52C30B33/02C30B11/00C30B11/003C22C19/057C22C1/023Y02P10/25
Inventor 温志勋卢广先李相辉刘川李萌岳珠峰
Owner NORTHWESTERN POLYTECHNICAL UNIV
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