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Method for surface peeling of powder superalloy

A high-temperature alloy and delamination technology, which is applied in the preparation of test samples, measuring devices, instruments, etc., can solve the problems of no obvious removal of delamination on the surface of powder superalloy, and can not meet the test requirements of residual stress on the surface of the sample. Eliminate the surface deformation disturbance layer, the removal effect is obvious, and the effect is easy to carry out

Inactive Publication Date: 2012-10-31
AECC AVIATION POWER CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the deficiencies in the prior art that either cannot meet the test requirements of the residual stress on the surface of the sample, or have no obvious removal effect on the surface delamination of the powder superalloy, the present invention proposes a method for delamination of the powder superalloy surface

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  • Method for surface peeling of powder superalloy
  • Method for surface peeling of powder superalloy

Examples

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Embodiment 1

[0016] This embodiment is a method for peeling off the surface of a FGH95 powder superalloy, and the specific process is:

[0017] Step 1, preparing a sample; the sample is a powdered nickel-based superalloy plate. The surface of the sample must be subjected to shot peening surface strengthening treatment; the shot peening intensity is 0.15A.

[0018] Step 2, preparing an electrolyte; the electrolyte is made of oxalic acid and distilled water, and the powdered oxalic acid is dissolved in distilled water and stirred until the powder oxalic acid is completely dissolved to obtain an electrolyte; the concentration of oxalic acid in the electrolyte is 5% , said percentage is mass content.

[0019] Step 3, corrode and peel off the layer; pour the prepared electrolyte into the electrolytic cell and heat it to 40°C and keep it warm. The sample to be corroded is completely immersed in the electrolyte. Turn on the power supply, adjust the voltage to 15V, the current to 1.5A, and turn...

Embodiment 2

[0021] This embodiment is a method for peeling off the surface of a FGH96 powder superalloy, and the specific process is:

[0022] Step 1, preparing a sample; the sample is a powdered nickel-based superalloy plate. The surface of the sample must be subjected to shot peening surface strengthening treatment; the shot peening intensity is 0.15A.

[0023] Step 2, preparing an electrolyte; the electrolyte is made of oxalic acid and distilled water, and the powdered oxalic acid is dissolved in distilled water and stirred until the powdered oxalic acid is completely dissolved to obtain an electrolyte; the concentration of oxalic acid in the electrolyte is 6% , said percentage is mass content.

[0024] Step 3, corrode and peel off the layer; pour the prepared electrolyte into the electrolytic cell and heat it to 35°C and keep it warm. The sample to be corroded is completely immersed in the electrolyte. Turn on the power supply, adjust the voltage to 15V, and the current to 1.5A. Th...

Embodiment 3

[0026] This embodiment is a method for peeling off the surface of a powdered FGH97 superalloy, and the specific process is:

[0027] Step 1, preparing a sample; the sample is a powdered nickel-based superalloy plate. The surface of the sample must be subjected to shot peening surface strengthening treatment; the shot peening intensity is 0.15A.

[0028] Step 2, preparing an electrolyte; the electrolyte is made of oxalic acid and distilled water, and the powdered oxalic acid is dissolved in distilled water and stirred until the powdered oxalic acid is completely dissolved to obtain an electrolyte; the concentration of oxalic acid in the electrolyte is 8% , said percentage is mass content.

[0029] Step 3, corrode and peel off the layer; pour the prepared electrolyte into the electrolytic cell and heat it to 30°C and keep it warm. The sample to be corroded is completely immersed in the electrolyte. Turn on the power supply, adjust the voltage to 15V, and the current to 1.5A. ...

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Abstract

The invention discloses a method for the surface peeling of powder superalloy. An oxalic acid solution is taken as electrolyte, and by means of controlling corrosion voltage, corrosion current and corrosion time, the surface of the powder superalloy is subjected to corrosive peeling layer by layer until the residual stress of a sample is 0. The method disclosed by the invention is suitable for powder superalloy samples of different shapes and sizes, in addition, additional deformation cannot be caused by carrying out peeling removal on all surfaces of each sample, a surface deformation disturbance layer is easy to remove, and the method is simple to operate and carry out, obvious in removal effect and free from influencing a test result.

Description

technical field [0001] The invention relates to the field of corrosion processing of metal materials, in particular to a method for peeling off the surface of a powder superalloy. Background technique [0002] When performing a material residual stress detection test, it is necessary to perform a peeling test on the surface of the material one by one according to a certain method, and then perform the test to obtain the residual stress curve of the material. There are usually two methods for peeling, one is mechanical and the other is electrochemical. Mechanical methods are prone to produce plastic deformation and crystal structure distortion on the surface of parts. These microstructural changes are likely to generate residual stress on the surface of parts and affect the accuracy of test results. [0003] The closest existing technology to the present invention is electrochemical machining, which selectively and controllably removes metal through chemical reactions, and e...

Claims

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Application Information

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IPC IPC(8): G01N1/32G01N3/00C25F3/02
Inventor 杨健董晓峰魏磊胡锴张爽刘国良吕建勋
Owner AECC AVIATION POWER CO LTD
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