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A high defect tolerance single crystal superalloy component and its preparation method

A technology for superalloys and components, applied in the direction of single crystal growth, single crystal growth, metal processing equipment, etc., can solve the problems affecting the performance of aero-engine, the difficulty of preparing large-sized internal micropores and small-angle grain boundaries, and the small tolerance. , to achieve good high temperature oxidation resistance and hot corrosion resistance, high endurance strength limit and creep limit, and low cost.

Active Publication Date: 2021-08-03
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a single crystal superalloy component with high defect tolerance and its preparation method, to solve (1) the existing single crystal superalloy solidification defect tolerance is small, the internal micropore size and small angle grain boundary Once the solidification defect is formed in the alloy, the performance of the single crystal alloy will drop rapidly, which will affect the performance of the aero-engine; (2) The single crystal superalloy is prepared by directional solidification, because this method has good feeding properties, making it very difficult to prepare large-scale internal micropores and small-angle grain boundaries in single crystal components; (3) currently, due to the lack of suitable means to prepare components containing solidification defects such as internal micropores of specific sizes, making Most of the standards for aero-engine high-temperature components are formulated with reference to foreign standards. The fundamental reason is that there are no single-crystal components with specific solidification defects in my country that can be assessed by relevant design units.

Method used

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  • A high defect tolerance single crystal superalloy component and its preparation method
  • A high defect tolerance single crystal superalloy component and its preparation method
  • A high defect tolerance single crystal superalloy component and its preparation method

Examples

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Effect test

Embodiment 1

[0048] The composition of this embodiment is shown in Table 1. This alloy has added a certain amount of carbide forming elements and rare earth elements in the original alloy composition (Table 2), wherein the total amount of Hf+Zr elements is 0.02wt.%, and the weight of Ti+V accounts for 0.09wt.%, Ce / La is 1, O+N≤0.021wt.%. By adding a small amount of carbide-forming elements, the content of carbides in superalloys is increased. In addition, by changing the size of the sample structure, the large-sized internal micropores in the alloy are reduced, and a certain amount of small-angle grain boundaries are formed, where L 1 Dimensions are 10mm, L 2 Dimensions are 0.5mm, H 1 Dimensions are 20mm, Y 1 The diameter is 0.5mm. Melt the paraffin wax at 50°C, inject the molten paraffin wax into the pre-designed metal mold with a heat preservation riser through the wax injection machine, and form the wax mold to complete the wax pattern combination, and put the assembled wax pattern ...

Embodiment 2

[0058] The alloy composition of this embodiment is shown in Table 4. This alloy has added a certain amount of carbide-forming elements and rare earth elements in the original alloy composition (Table 2), wherein the total amount of Hf+Zr elements is 0.06wt.%, and the weight of Ti+V Accounting for 0.3wt.%, O+N≤0.021wt.%. The difference from Example 1 is that the alloy composition in this example is characterized by the addition of carbide-forming elements to the upper limit, and the addition of rare earth elements to the upper limit. By adding a small amount of carbide-forming elements, the content of carbides in superalloys is increased. In addition, by changing the size of the sample structure, the large-sized internal micropores in the alloy are reduced, and a certain amount of small-angle grain boundaries are formed, where L 1 Dimensions are 10mm, L 2 Dimensions are 0.5mm, H 1 Dimensions are 20mm, Y 1 The diameter is 0.5mm. Melt the paraffin wax at 50°C, inject the molt...

Embodiment 3

[0065] The composition of the alloy in this example is the same as that in Example 2, and the structural size of the sample is adjusted so that solidification defects such as small-angle grain boundaries and internal micropores exist in the sample. The composition of this embodiment is shown in Table 6. This alloy has added a certain amount of carbide forming elements and rare earth elements in the original alloy composition (Table 2), wherein the total amount of Hf+Zr elements is 0.06wt.%, and the weight of Ti+V accounts for 0.3wt.%, O+N≤0.021wt.%, its composition is characterized by the addition of carbide-forming elements to the upper limit, and the addition of rare earth elements to the upper limit. By adding a small amount of carbide-forming elements, the content of carbides in superalloys is increased. In addition, by changing the size of the sample structure, the large-sized internal micropores in the alloy are reduced, and a certain amount of small-angle grain boundari...

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Abstract

The invention discloses a single-crystal superalloy component with high defect tolerance and a preparation method thereof, belonging to the technical field of superalloy materials and investment casting. By adding and optimizing Hf, B, Zr, Ti, V and other carbide-forming elements carbon to form different types of carbides, improve grain boundary strength, increase the tolerance of small-angle grain boundary defects, and improve internal micropores through Ce, La, etc. tolerance. by L 1 , L 2 、H 1 The change in size between the three prepares a single crystal structure with no internal microporous content, by L 1 and Y 1 The change of the structure size changes the secondary dendrite growth during the solidification process of the component, and realizes the preparation of small-angle grain boundary defects with different angle differences. The invention realizes the quantitative preparation of solidification defects such as internal micropores and small-angle grain boundaries of single-crystal high-temperature alloys through the coordinated adjustment of alloy components and component structures.

Description

Technical field: [0001] The invention relates to the technical field of superalloy materials and investment casting, in particular to a single crystal superalloy component with high defect tolerance and a preparation method thereof. Background technique: [0002] Single crystal superalloys are indispensable key structural materials for aviation, aerospace, energy, nuclear industry, petrochemical, national defense weaponry and national economic construction. Due to the very complex structure of single crystal superalloy components, the directional solidification process easily leads to the appearance of solidification defects such as internal micropores and small-angle grain boundaries, thereby affecting the service life of components. As a defect organization, small-angle grain boundaries reintroduce transverse grain boundaries, destroy the structural integrity of single crystal superalloy blades, and significantly reduce the high-temperature mechanical properties of the all...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05B22D27/04C30B11/00C30B29/52B22C9/04
CPCB22C9/04B22D27/045C22C19/057C30B11/00C30B29/52
Inventor 于金江周亦胄杨彦红王新广侯桂臣孙晓峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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