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Low-cost high-performance vegetarized single-crystal high-temperature alloy and preparation method thereof

A superalloy, high-performance technology, applied in the field of superalloys, can solve problems such as limiting the promotion and application of single crystal superalloys, reducing cost performance, and being unable to further develop environmental resistance design

Active Publication Date: 2022-07-05
北航(四川)西部国际创新港科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the design process of existing single crystal superalloys, in order to improve the physical and chemical properties of single crystal superalloys, it is usually chosen to add a large amount of alloying elements—especially rare and refractory elements, through the strengthening of rare and precious refractory elements. However, this also caused problems such as numerous alloy elements, excessive weight and cost, poor high temperature stability, and the inability to further develop environmental resistance design, which greatly increased the production cost of single crystal superalloys. High, low cost performance, which seriously limits the promotion and application of single crystal superalloys

Method used

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  • Low-cost high-performance vegetarized single-crystal high-temperature alloy and preparation method thereof
  • Low-cost high-performance vegetarized single-crystal high-temperature alloy and preparation method thereof
  • Low-cost high-performance vegetarized single-crystal high-temperature alloy and preparation method thereof

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preparation example Construction

[0036]The present invention provides a method for preparing a plain single crystal superalloy according to the above technical solution, comprising the following steps:

[0037] (1) smelting alloy raw material to obtain master alloy ingot;

[0038] (2) directional solidification is performed after the mother alloy ingot obtained in the step (1) is melted to obtain an alloy ingot;

[0039] (3) The alloy ingot obtained in the step (2) is sequentially subjected to solution treatment and isothermal transformation heat treatment to obtain a plain single crystal superalloy.

[0040] In the present invention, the alloy raw material is smelted to obtain a master alloy ingot.

[0041] The present invention does not have a special limitation on the specific types and proportions of the alloy raw materials, and the metal element or the intermediate alloy can be selected according to the proportion of each element in the alloy product. The source of the alloy raw material is not particu...

Embodiment 1

[0056] A low-cost and high-performance plain single-crystal superalloy, which is composed of the following components in terms of mass percentage: 9% of Al, 9% of Cr, 6% of Co, 12% of W and the balance of Ni;

[0057] The preparation method of the plain single crystal superalloy is composed of the following steps:

[0058] (1) Smelting the alloy raw material, and cooling to obtain a master alloy ingot; the smelting temperature is 1600°C, and the smelting holding time is 1.5h;

[0059] (2) The master alloy ingot obtained in the step (1) is melted at 1500° C. and then cast into a wax mold for 0.5 h, followed by directional solidification to obtain an alloy ingot with [111] crystal orientation; The pulling rate is 3mm / min;

[0060] (3) The alloy ingot obtained in the step (2) is successively subjected to solution treatment and isothermal transformation heat treatment, and after cooling, a plain single crystal superalloy is obtained; , and then kept at 1250° C. for 12 hours; the...

Embodiment 2

[0063] A low-cost and high-performance plain single-crystal superalloy, which is composed of the following components in terms of mass percentage: 9% of Al, 9% of Cr, 6% of Co, 12% of Mo and the balance of Ni;

[0064] The preparation method of the plain single crystal superalloy is composed of the following steps:

[0065] (1) Smelting the alloy raw material, and cooling to obtain a master alloy ingot; the smelting temperature is 1600°C, and the smelting holding time is 1.5h;

[0066] (2) The master alloy ingot obtained in the step (1) is melted at 1500° C. and then cast into a wax mold for 0.5 h, followed by directional solidification to obtain an alloy ingot with [111] crystal orientation; The pulling rate is 3mm / min;

[0067] (3) The alloy ingot obtained in the step (2) is successively subjected to solution treatment and isothermal transformation heat treatment, and after cooling, a plain single crystal superalloy is obtained; , and then kept at 1250° C. for 12 hours; th...

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Abstract

The invention provides a low-cost and high-performance vegetarized single-crystal high-temperature alloy and a preparation method thereof, and belongs to the technical field of high-temperature alloys. The low-cost and high-performance vegetarized single-crystal high-temperature alloy provided by the invention is prepared from the following components in percentage by mass: 8 to 12 percent of Al, 8 to 10 percent of Cr, 1 to 6 percent of Co, 3 to 14 percent of strengthening elements and the balance of Ni, and the strengthening element comprises W, Mo, Nb or Ta. According to the invention, Al and Ni can form a precipitation strengthening phase Ni3Al, so that the high-temperature heat resistance of the alloy is improved, and meanwhile, the density of the alloy is reduced; cr has a solid solution strengthening effect, so that the marine corrosion resistance of the alloy is improved; co can inhibit corrosion internal diffusion and reduce the stacking fault energy of the Ni solid solution; the strengthening elements can improve the high-temperature low-stress performance and the ultra-high-temperature bearing capacity of the alloy, and meanwhile instability of the structure is avoided; the high-temperature alloy is low in cost and has good cost performance and environmental friendliness.

Description

technical field [0001] The invention relates to the technical field of superalloys, in particular to a low-cost and high-performance plain single-crystal superalloy and a preparation method thereof. Background technique [0002] Ni-based single crystal superalloys are the key materials for the preparation of high-pressure turbine blades for aero-engines. The rapid development of aero-engines has put forward the comprehensive properties of Ni-based single crystal superalloys such as temperature bearing capacity, physical / chemical properties, mechanical properties, cost, and density. demanding requirements. [0003] Civil engines pursue cost-effectiveness and environmental friendliness of turbine blade materials. As we all know, the composition of modern commercial single crystal superalloy grades is extremely complex, and there are more than ten kinds of alloying elements, including a large number of rare and refractory elements, such as Re, Ru, W, etc. It is estimated that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05C22C1/03C22F1/00
CPCC22C19/057C22C1/03C22F1/00
Inventor 茹毅杜博暄裴延玲李树索宫声凯
Owner 北航(四川)西部国际创新港科技有限公司
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