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Metallographic corrosive of stainless steel high temperature quenched structure and corrosion method thereof

A technology of high-temperature quenching and corrosive agents, applied in the field of heat treatment, can solve the problems of not obtaining solid-liquid two-phase structure

Inactive Publication Date: 2019-12-24
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After high-temperature quenching of stainless steel, when using the existing method for metallographic corrosion, it is often impossible to obtain a clear solid-liquid two-phase structure, which brings a lot of inconvenience to the subsequent analysis of the metallographic structure

Method used

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  • Metallographic corrosive of stainless steel high temperature quenched structure and corrosion method thereof
  • Metallographic corrosive of stainless steel high temperature quenched structure and corrosion method thereof
  • Metallographic corrosive of stainless steel high temperature quenched structure and corrosion method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Slowly add 5ml of nitric acid with a concentration of 68% into 30ml of absolute ethanol and stir evenly to prepare the first corrosion agent; add 1g of citric acid to 30ml of absolute ethanol and keep stirring, and slowly add 10ml of hydrochloric acid with a concentration of 37% , stir and mix evenly, and prepare a liquid. Put clean water at room temperature into the ultrasonic cleaning machine, put the beakers containing the first and second corrosive agents into the ultrasonic cleaning machine, turn on the ultrasonic cleaning machine, soak the ground sample in the first corrosive agent for 10 seconds, and take out the test sample. Samples were cleaned with absolute ethanol, dried, and then soaked in the second corrosive agent for 20s, and the samples were taken out, cleaned with absolute ethanol and dried. The prepared sample was observed at 50 times magnification under a metallographic microscope, and the following results were obtained: figure 1 legend shown. The ...

Embodiment 2

[0027] Slowly add 5ml of nitric acid with a concentration of 68% into 50ml of absolute ethanol and stir evenly to prepare the first corrosion agent; add 2g of citric acid to 50ml of absolute ethanol and stir continuously, and slowly add 12ml of hydrochloric acid with a concentration of 37% , stir and mix evenly, and prepare the second corrosive agent. Put clean water at room temperature into the ultrasonic cleaning machine, put the beakers containing the first and second corrosive agents into the ultrasonic cleaning machine, turn on the ultrasonic cleaning machine, soak the ground sample in the first corrosive agent for 15 seconds, and take out the test sample. The sample was cleaned with absolute ethanol, dried, and then soaked in the second corrosive agent for 25s, and the sample was taken out, washed with absolute ethanol and dried. The prepared sample was observed at 50 times magnification under a metallographic microscope, and the following results were obtained: figure...

Embodiment 3

[0029] Slowly add 7ml of nitric acid with a concentration of 68% into 40ml of absolute ethanol and stir evenly to prepare the first corrosion agent; add 3g of citric acid to 40ml of absolute ethanol and stir continuously, and slowly add 12ml of hydrochloric acid with a concentration of 37% , stir and mix evenly, and prepare the second etchant solution. Put clean water at room temperature into the ultrasonic cleaning machine, put the beakers containing the first and second corrosive agents into the ultrasonic cleaning machine, turn on the ultrasonic cleaning machine, soak the ground sample in the first corrosive agent for 20 seconds, and take out the test sample. The samples were cleaned with absolute ethanol, dried, and then soaked in the second corrosive agent for 30s, and the samples were taken out, washed with absolute ethanol and dried. The prepared sample was observed at 50 times magnification under a metallographic microscope, and the following results were obtained: i...

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Abstract

The invention relates to a metallographic corrosive of a stainless steel high temperature quenched structure and a corrosion method thereof. The corrosive is made from a first corrosive and a second corrosive, wherein the first corrosive is prepared by mixing nitric acid with concentration of 68% and absolute ethyl alcohol, and the second corrosive is prepared by mixing hydrochloric acid with concentration of 37%, citric acid and absolute ethyl alcohol. The corrosive provided in the invention is easy to prepare, and the corrosion method is simple to conduct and can deliver a clear metallographic structure.

Description

technical field [0001] The invention belongs to the technical field of heat treatment and relates to a metallographic corrosion method suitable for high-temperature quenched structures of stainless steel. Background technique [0002] When studying the solidification structure of stainless steel, it is necessary to heat the molten steel to the liquidus line and above before quenching. The analysis of metallographic structure is of great significance to the accurate evaluation of grain size and structure shape. After high-temperature quenching of stainless steel, when using existing methods for metallographic corrosion, it is often impossible to obtain a clear solid-liquid two-phase structure, which brings a lot of inconvenience to the subsequent analysis of the metallographic structure. Therefore, it is necessary to find a metallographic corrosion method that can quickly and effectively quench the structure of stainless steel at high temperature, and clearly display its str...

Claims

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Application Information

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IPC IPC(8): G01N1/32C23F1/28C22C38/02C22C38/58C22C38/42C22C38/00
CPCC22C38/002C22C38/02C22C38/42C22C38/58C23F1/28G01N1/32
Inventor 张连兵邹长东赵家七蔡小锋
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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