Metallographic etchant and corrosion method for medium-entropy superalloy

A technology of superalloy and etchant, applied in the direction of instruments, analytical materials, measuring devices, etc., can solve the problems of difficult metallographic inspection, no corrosive agent and corrosion method, etc., and achieve the effect of simple and easy operation.

Active Publication Date: 2021-10-19
BEIJING BEIYE FUNCTIONAL MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Medium-entropy superalloys have very strong corrosion resistance, and metallographic examination is very difficult
So far, no mature etchant and corrosion method for metallographic samples of medium-entropy superalloys have appeared

Method used

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  • Metallographic etchant and corrosion method for medium-entropy superalloy
  • Metallographic etchant and corrosion method for medium-entropy superalloy
  • Metallographic etchant and corrosion method for medium-entropy superalloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] For conventional metallographic sampling, use an 80-mesh grinding wheel to smooth the sample, and then use 400#, 500#, and 900# sandpaper to smooth the surface of the sample. Each sandpaper grinding should completely cover the grinding marks of the previous sandpaper, and the polishing machine will polish it. . Sample corrosion: Mix 5g of copper sulfate, 15ml of hydrochloric acid, 10ml of water, 2g of ferric chloride, and 2ml of nitric acid to make a corrosive agent, put the sample into the corrosive agent, the stainless steel plate is the cathode, the sample is the anode, and the electrolysis voltage is 1.5V , the current is 0.1A, and the electrolytic corrosion time is 60s. After the sample is taken out, it is cleaned with alcohol and dried. The morphology of the sample tissue was observed and evaluated under an optical microscope.

Embodiment 2

[0021] For conventional metallographic sampling, use an 80-mesh grinding wheel to smooth the sample, and then use 400#, 500#, and 900# sandpaper to smooth the surface of the sample. Each sandpaper should completely cover and remove the grinding marks of the previous sandpaper. polishing. Sample corrosion: Mix 10g of copper sulfate, 30ml of hydrochloric acid, 25ml of water, 3g of ferric chloride, and 4ml of nitric acid to make a corrosion agent. The stainless steel plate is the cathode, and the sample is the anode. The electrolytic voltage is 5V, the current is 0.3A, and the electrolytic corrosion time After 20 seconds, the sample was cleaned with alcohol and dried. The morphology of the sample tissue was observed and evaluated under an optical microscope.

Embodiment 3

[0023] For conventional metallographic sampling, use an 80-mesh grinding wheel to smooth the sample, and then use 400#, 500#, and 900# sandpaper to smooth the surface of the sample. Each sandpaper should completely cover and remove the grinding marks of the previous sandpaper. polishing. Sample corrosion: Mix 7g of copper sulfate, 20ml of hydrochloric acid, 20ml of water, 2g of ferric chloride, and 2ml of nitric acid to make a corrosive agent. The stainless steel plate is the cathode, and the sample is the anode. The electrolytic voltage is 3V, the current is 0.2A, and the electrolytic corrosion time After 30s, the sample was taken out and cleaned with alcohol and dried. The morphology of the sample tissue was observed and evaluated under an optical microscope.

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Abstract

A medium-entropy superalloy metallographic etchant and corrosion method, belonging to the technical field of metal functional materials, using metal etchant copper sulfate, hydrochloric acid, water, ferric chloride and nitric acid, the ratio of which is: copper sulfate 5-10g, hydrochloric acid 15ml-30ml , 10ml-25ml of water, 2-3g of ferric chloride, and 2-4ml of nitric acid are mixed to form a corrosive agent. Put the sample into the corrosive agent for electrolytic corrosion, the stainless steel plate is the cathode, the sample is the anode, the electrolysis voltage is 1.5V-5V, the electrolysis current is 0.1A-0.3A, and the electrolysis is 20s-60s. After the sample was taken out, it was cleaned with alcohol and dried, and its microstructure was observed under a microscope. The advantage is that the structure and morphology of the medium-entropy superalloy can be corroded relatively clearly, and the method is simple and easy to implement. It is suitable for displaying the metallographic structure and morphology of medium-entropy superalloys with various components.

Description

technical field [0001] The invention belongs to the technical field of metal functional materials, and in particular relates to a medium-entropy high-temperature alloy metallographic etchant and a corrosion method for observing the grain size and shape distribution of the medium-entropy high-temperature alloy. It is suitable for corroding medium-entropy superalloys in different composition states, showing alloy microstructures in various compositions and states. [0002] technical background [0003] Medium-entropy superalloys have excellent tensile strength and fracture toughness, and the alloy has higher yield strength and comparable ductility than many common TWIP steels. Therefore, in recent years, the medium-entropy superalloy, which is based on the addition of Al, Ti, and Ta elements for aging strengthening, has been more and more widely used. [0004] The technological performance and serviceability of metal materials are determined by the internal structure of the me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/16G01N1/28G01N1/32
CPCC23F1/16G01N1/286G01N1/32
Inventor 曹青安宁
Owner BEIJING BEIYE FUNCTIONAL MATERIALS CORP
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