Chemical method for removing remelted layer on monocrystal nickel-base high-temperature alloy surface

A nickel-based superalloy, chemical removal technology, applied in the field of surface treatment, can solve the problems of affecting the performance of parts, low work efficiency, high cost, and achieve the effect of unaffected performance, improved work efficiency, and improved work efficiency

Active Publication Date: 2011-07-27
AECC AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, neither of these two removal methods can be used for single crystal nickel-based superalloy materials, because there are hidden dangers such as recrystallization that affect the performance of single crystals
At the same time, for complex structures or small-sized, thin-walled parts, these two methods have certain limitations, not only cannot completely remove the remelted layer on the surface of the part, but also have low work efficiency and high cost
At present, after wire cutting of single crystal nickel-based superalloy parts, the remelted layer produced on the cutting surface can only be removed by mechanical grinding, which will affect the performance of the part due to the phenomenon of recrystallization
No related foreign literature was retrieved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A 01 batch of single crystal nickel-based superalloy (material grade: DD6 alloy) parts. After cutting by slow wire cutting machine, the appearance is flat and uniform, and the thickness of the remelted layer is about 0.003mm in metallographic examination.

[0017] The steps to remove the remelted layer are as follows:

[0018] 1. Place the test piece in a hot water-based detergent solution at about 60°C for about 30 minutes, then rinse it with water and check its cleanliness and oil-free by using the water film rupture test method, then dry its surface with a hair dryer, and place it in a place for removal and remelting layer in containers and arrange them neatly so that they do not overlap or overlap each other.

[0019] 2. Prepare the removal solution in an environment with ventilation equipment:

[0020] Hydrochloric acid (chemically pure) 50% (v / v)

[0021] Hydrogen peroxide (chemically pure) 50% (v / v)

[0022] 3. Stir and mix the prepared solution for removing ...

Embodiment 2

[0026] For a 02 batch of single crystal nickel-based superalloy (material grade: DD6 alloy) parts, the previous process was electric discharge machining. In order to remove the remelted layer on the surface of the part after EDM, the specific steps are as follows:

[0027] 1. Place the test piece in a hot water-based cleaning agent solution at about 65°C for about 40 minutes, then rinse it with water and check its cleanliness and oil-free by the water film rupture test method, dry its surface with a hair dryer, and place it in a place to remove and remelt layer in containers and arrange them neatly so that they do not overlap or overlap each other.

[0028] 2. Prepare the removal solution in an environment with ventilation equipment:

[0029] Hydrochloric acid (chemically pure) 40% (v / v)

[0030] Hydrogen peroxide (chemically pure) 60% (v / v)

[0031] 3. Stir and mix the prepared solution for removing the remelting layer, and immediately pour it into a container with parts f...

Embodiment 3

[0035] A 03 batch of single crystal nickel-based superalloy (material grade: DD99 alloy) parts, the previous process was cut by wire cutting machine. In order to remove the remelted layer on the surface of the part after wire cutting, the specific steps are as follows:

[0036] 1. Place the test piece in a hot water-based cleaning agent solution at about 65°C for about 35 minutes, then rinse it with water and check its cleanliness and oil-free by using the water film rupture test method, then dry its surface with a hair dryer, and place it in a place for removal and remelting layer in containers and arrange them neatly so that they do not overlap or overlap each other. 2. Prepare the removal solution in an environment with ventilation equipment:

[0037] Hydrochloric acid (chemically pure) 45% (v / v)

[0038] Hydrogen peroxide (chemically pure) 55% (v / v)

[0039] 3. Stir and mix the prepared solution for removing the remelting layer, and immediately pour it into a container ...

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PUM

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Abstract

The invention belongs to surface treatment technology and relates to an improved method for removing a remelted layer on a monocrystal nickel-base high-temperature alloy surface. The method comprises the following steps of: removing oil from the part surface; preparing a remelted layer removing solution; removing the remelted layer; and cleaning the part. The invention can not cause recrystallization on the monocrystal nickel-base high-temperature alloy surface and ensure that the performance of the part is free from adverse effects. Meanwhile, the invention enhances the work efficiency and reduces the cost.

Description

technical field [0001] The invention belongs to the surface treatment technology and relates to an improvement on a method for removing a remelted layer on the surface of a single-crystal nickel-based superalloy. Background technique [0002] The remelted layer produced on the surface of parts due to special processing methods is generally removed by mechanical grinding or sand blasting. However, neither of these two removal methods can be used for single crystal nickel-based superalloy materials, because there are hidden dangers such as recrystallization that may affect the performance of single crystals. At the same time, for complex structures or small-sized, thin-walled parts, these two methods have certain limitations, not only cannot completely remove the remelted layer on the surface of the part, but also have low work efficiency and high cost. At present, after wire cutting of single crystal nickel-based superalloy parts, the remelted layer produced on the cutting s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/10
Inventor 陈晓彦马凌霄刘长刚
Owner AECC AVIATION POWER CO LTD
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