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Method for controlling recrystallization of directionally solidified Ni-based superalloy by alumetizing

A nickel-based superalloy, directional solidification technology, applied in chemical instruments and methods, crystal growth, solid-state diffusion coating, etc., can solve the problems of easy oxidation of alloy matrix, complicated equipment, complicated operation, etc. The effect of reducing crystallization and improving production efficiency

Inactive Publication Date: 2013-01-30
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

[0008] (1) The equipment of the gas carburizing method is more complicated and the operation is more cumbersome. The recrystallization is controlled by carbide ions hindering the migration of the grain boundary, and it is mainly used in single crystal alloys.
[0009] (2) Repeated recovery heat treatment at a lower temperature cannot inhibit the nucleation of the recrystallized surface, and the longer the recovery heat treatment time, the alloy matrix is ​​easily oxidized, which is unfavorable for the use of the alloy
This method is not suitable for thin-walled single crystal or oriented columnar nickel-based superalloy components

Method used

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  • Method for controlling recrystallization of directionally solidified Ni-based superalloy by alumetizing

Examples

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Effect test

Embodiment 1

[0030] Example 1 Aluminizing Controls Recrystallization of DZ125L Alloy

[0031] The DZ125L directionally solidified nickel-based nickel-based superalloy plate was prepared by the directional solidification equipment, and a 2×12×12mm square was cut from the plate by wire cutting. Polish the surface of 12×12 (direction of oriented columnar crystal growth), and perform sandblasting treatment with a sandblasting device. Sandblasting parameters are as follows: sandblasting pressure is 0.3MPa, sandblasting time is 1min, and the sand particles are SiO 2 Glass ball.

[0032] Prepare the osmotic agent, the used osmotic agent formula is as follows: 40% Al powder, 55% Al 2 o 3 Powder and 5% NH 4 Cl (weight percent). Among them, the particle size of Al powder is Al 2 o 3 The particle size of the powder is Next, mix part of the sandblasted samples into the infiltrating agent, put them into a heat treatment furnace, raise the temperature to 600°C to start aluminizing, and pass t...

Embodiment 2

[0034] Example 2 Aluminizing Controls Recrystallization of DZ125L Alloy

[0035] The DZ125L directionally solidified nickel-based nickel-based superalloy plate was prepared by the directional solidification equipment, and a 2×12×12mm square was cut from the plate by wire cutting. Polish the surface of 12×12 (direction of oriented columnar crystal growth), and perform sandblasting treatment with a sandblasting device. Sandblasting parameters are as follows: sandblasting pressure is 0.3MPa, sandblasting time is 1min, and the sand particles are SiO 2 Glass ball.

[0036] Prepare the osmotic agent, the used osmotic agent formula is as follows: 50% Al powder, 40% Al 2 o 3 Powder and 10% NH 4 Cl (weight percent). Among them, the particle size of Al powder is Al 2 o 3 The particle size of the powder is Next, mix part of the sandblasting samples into the infiltrating agent, put them into a heat treatment furnace, raise the temperature to 600°C to start aluminizing, and pass...

Embodiment 3

[0038] Example 3 Aluminizing Controls Recrystallization of DZ17G Alloy

[0039] The DZ17G directionally solidified nickel-based nickel-based superalloy plate was prepared by the directional solidification equipment, and a 2×12×12mm square was cut from the plate by wire cutting. Polish the surface of 12×12 (direction of oriented columnar crystal growth), and perform sandblasting treatment with a sandblasting device. Sandblasting parameters are as follows: sandblasting pressure is 0.3MPa, sandblasting time is 1min, and the sand particles are SiO 2 Glass ball.

[0040] Prepare the osmotic agent, the used osmotic agent formula is as follows: 40% Al powder, 55% Al 2 o 3 Powder and 5% NH 4 Cl (weight percent). Among them, the particle size of Al powder is al 2 o 3 The particle size of the powder is Next, mix part of the sandblasting samples into the infiltrating agent, put them into a heat treatment furnace, raise the temperature to 600°C to start aluminizing, and pass th...

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Abstract

The invention provides a method for controlling the recrystallization of directionally solidified Ni-based superalloy by alumetizing, characterized by carrying out alumetizing on the surface of a directionally solidified Ni-based superalloy component that is deformed by alumetizing,; and carrying out standard solution treatment of alloy matrixes on the alumetized directionally solidified Ni-based superalloy component. According to the invention, the depth of the recrystallization of the directionally solidified Ni-based superalloy is controllable, and the control effect on the recrystallization caused by uniform deformation is significant. Compared with recrystals generated by deformed directionally solidified alloy sample without alumetizing, the recrystals are distributed scatteredly and nonuniformly, the maximum recrystallization depth is obviously reduced, the recrystallization area is correspondingly obviously reduced, there is no residual stress in electroplating process, thus the possibility of generating recrystals by residual stress is avoided. The alumetizing method is one of the most efficient methods for inhibiting the development of recrystallization.

Description

technical field [0001] The invention relates to a recrystallization control technology, in particular to a technology for controlling the recrystallization of directionally solidified columnar crystals and single crystal nickel-based superalloys by using an aluminizing method. Background technique [0002] Gas turbine and aero-engine blades are used at higher temperatures, and the blades are mainly affected by centrifugal force. At high temperatures, the strength of the grain boundary is not as strong as the intragranular strength, and the transverse grain boundary becomes the weak link of the blade. For this reason, people have developed oriented columnar crystals or even single crystal blades to eliminate transverse grain boundaries or all grain boundaries. These blades have better longitudinal mechanical properties and higher temperature capability than conventional polycrystalline blades. [0003] However, during the directional solidification process of the blade, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/28C22F1/10C30B33/02
Inventor 谢光张健楼琅洪
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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