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Etching agent, preparation method and application of prior austenite grain boundary display in fb2 steel

A technology of austenite grain boundary and etchant, which is applied in the preparation of test samples, etc., can solve the problems of inconvenience and difficulty in displaying grain boundaries, and achieve the effects of slowing down the corrosion rate, improving stability, and increasing stability

Active Publication Date: 2020-01-21
HUANENG POWER INT INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the inspection of grain size, due to the higher content of alloy elements and stronger corrosion resistance of grain boundaries of FB2 steel, the existing etchant can only show its martensitic lath structure, but it is difficult to show its grain size. This has brought a lot of inconvenience to the material testing and analysis work

Method used

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  • Etching agent, preparation method and application of prior austenite grain boundary display in fb2 steel
  • Etching agent, preparation method and application of prior austenite grain boundary display in fb2 steel
  • Etching agent, preparation method and application of prior austenite grain boundary display in fb2 steel

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Embodiment 1

[0023] Embodiment 1: Get 220 milliliters of distilled water and 18 milliliters of analytically pure glycerol and mix in a beaker, measure 10 milliliters of analytically pure hydrochloric acid and slowly add in the beaker along the inner wall of the beaker, constantly stir, finally, add and weigh 4 grams of Ferric trichloride, stirring constantly, finally add 8 milliliters of detergent, stirring constantly to mix evenly to obtain the etchant.

Embodiment 2

[0024] Embodiment 2: Get 200 milliliters of distilled water and 18 milliliters of analytically pure glycerol and mix in a beaker, measure 7 milliliters of analytically pure hydrochloric acid and slowly add in the beaker along the inner wall of the beaker, constantly stir, finally, add and weigh 2.5 grams of Ferric trichloride, stirring constantly, finally add 3 milliliters of detergent, stirring constantly to mix evenly to obtain the etchant.

Embodiment 3

[0025] Embodiment 3: get 180 milliliters of distilled water and 12 milliliters of analytically pure glycerol and mix in a beaker, measure 4 milliliters of analytically pure hydrochloric acid and slowly add in the beaker along the inner wall of the beaker, constantly stir, finally, add and weigh 4.0 grams of Ferric trichloride, stirring constantly, finally add 4 milliliters of detergent, stirring constantly to mix evenly to obtain the etchant.

[0026] The application method of etching agent of the present invention is as follows:

[0027] 1) First, the metallographic sample of FB2 steel is ground and polished, and its surface is cleaned with absolute ethanol, and dried with a hair dryer;

[0028] 2) Next, pour the etchant into a glass dish with absorbent cotton, and immerse the above-mentioned polished metallographic sample with the corroded side facing down, and the corroding time is 5-10 minutes. Take it out when the surface of the sample is white-gray, rinse it with water,...

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Abstract

The invention discloses an etching agent for displaying the prior austenite crystal boundary of FB2 steel and a preparation method and application thereof. The etching agent comprises, by volume, 85-90% of distilled water, 6-8% of analytically pure glycerol, 2-4% of analytically pure hydrochloric acid and 1-3% of a cleanser essence and comprises, by mass, 1-2% of ferric trichloride, wherein the volume fractions are the total volume fractions of the components including distilled water, glycerol, hydrochloric acid and the cleanser essence in the etching agent, and the mass fraction is the totalmass fraction of ferric trichloride in the etching agent. The invention further discloses a preparation method and application method of the etching agent. The etching agent can display the prior austenite crystal boundary of the FB2 steel, the prior austenite crystal boundary can be clearly displayed under an optical microscope, and thus the grain size can be evaluated.

Description

technical field [0001] The invention belongs to the technical field of corrosive agents for metallographic inspection methods of metal iron and steel materials, and in particular relates to an corrosive agent for displaying the grain boundary of FB2 steel original austenite, a preparation method and an application method thereof. Background technique [0002] Grain size is an important indicator of metal materials. It has a significant impact on the mechanical properties of metal materials at room temperature and high temperature, and the non-destructive testing characteristics of materials. It is also an important inspection item in the quality inspection of metal materials. Therefore, in the metallographic structure analysis, it is very important to carry out the detection and evaluation of the grain size of metal materials. FB2 steel is the steel for high and medium pressure rotors of high-efficiency ultra-supercritical units at 620°C. It is developed on the basis of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/32
Inventor 田晓徐慧秦承鹏杨百勋王理博
Owner HUANENG POWER INT INC