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Mold shell and method for preparing [011] or [111] oriented single crystal high-temperature alloy

A technology for high-temperature alloys and mold shells, which is applied in the field of mold shells for preparing [011] or [111]-oriented single crystal superalloys, which can solve the problems of uneven structure and affecting the mechanical properties of alloys, etc.

Active Publication Date: 2021-04-23
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

AI Technical Summary

Problems solved by technology

A closed area will be formed at the front of the hindered dendrites, which will lead to the enrichment of γ’ phase-forming elements, which will eventually lead to inhomogeneous structures and weak areas, which will affect the mechanical properties of the alloy.

Method used

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  • Mold shell and method for preparing [011] or [111] oriented single crystal high-temperature alloy
  • Mold shell and method for preparing [011] or [111] oriented single crystal high-temperature alloy
  • Mold shell and method for preparing [011] or [111] oriented single crystal high-temperature alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] This example is to prepare [011] orientation single crystal superalloy

[0067] Prepare the seeds:

[0068] The [001] direction and the [100] direction are marked on the Ni-based single crystal superalloy pattern by the Lloyd method, and a square single crystal is cut out in a direction. The axial direction of the square single crystal is the [001] direction, and the side normal direction is [100] ]direction.

[0069] Then the square single crystal is polished and etched to obtain a seed crystal, the cross-sectional size of the seed crystal is 3 × 3mm, and the length is 27mm; the polishing includes the following steps: using 60#, 240#, 600# After #, 1000#, 1500# and 2000# sand papers are polished, use 1mm diamond grinding paste to polish; The corrosion treatment is chemical reagent corrosion, and the chemical reagent is a mixed solution of hydrogen peroxide and hydrochloric acid, and the mass concentration of the hydrogen peroxide is 30% , the mass concentration of th...

Embodiment 2

[0083] This example is to prepare [111] orientation single crystal superalloy

[0084] Prepare the seed crystal;

[0085] The [001] direction and the [110] direction are marked on the Ni-based single crystal superalloy pattern by the Lloyd method, and a square single crystal is cut out in a direction. The single crystal axis is the [001] direction, and the side normal direction is the [110] direction. .

[0086] Subsequently, the square single crystal is polished and etched to obtain a seed crystal; the cross-sectional size of the seed crystal is 3×3mm, and the length is 21mm; the polishing includes the following steps: sequentially adopt 60#, 240#, 600 After #, 1000#, 1500# and 2000# sand papers are polished, use 1mm diamond grinding paste to polish; The corrosion treatment is chemical reagent corrosion, and the chemical reagent is a mixed solution of hydrogen peroxide and hydrochloric acid, and the mass concentration of the hydrogen peroxide is 30% , the mass concentration...

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Abstract

The invention provides a mold shell and method for preparing [011] or [111] oriented single crystal superalloy, and belongs to the technical field of single crystal superalloy preparation. The mold shell provided by the invention comprises an amplifier, a seed crystal, an angle regulator and a casting, wherein the angle regulator realizes axial direction regulation of the casting; and the axial direction of the casting is consistent with the [011] direction or the [111] direction of the seed crystal. According to the invention, the mold shell can enable the growth direction of dendrites in the casting to be consistent with the heat flow direction, can effectively avoid intersection among the dendrites, enables elements to be uniformly distributed, eliminates a weak region generated by asymmetric growth of the dendrites, and improves the mechanical properties of the single crystal superalloy.

Description

technical field [0001] The invention relates to the field of single crystal superalloy preparation, in particular to a mold shell and method for preparing a [011] or [111] oriented single crystal superalloy. Background technique [0002] Nickel-based single crystal superalloys are widely used as blade materials for advanced aeroengines due to their excellent tensile, durable, oxidation and corrosion resistance properties. Nickel-based single crystal superalloys are solid solutions with a face-centered cubic structure and a preferred orientation in the [001] direction. [0003] The preparation of nickel-based single crystal superalloys mainly adopts directional solidification technology. When the solidification direction is consistent with the preferred growth direction [001], the primary dendrites are evenly spaced and arranged parallel to the solidification direction, and the secondary dendrites are symmetrically distributed. The cross-section presents a cross-shaped shape...

Claims

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Application Information

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IPC IPC(8): C30B15/10C30B29/52C30B33/10B22C9/04C22C19/03C22C19/05
CPCC30B15/10C30B29/52C30B33/10B22C9/043C22C19/057C22C19/03
Inventor 李树索胡斌裴延玲宫声凯
Owner 北航(四川)西部国际创新港科技有限公司
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