Corrosive agent for fine austenite grain boundary display in low carbon microalloyed steel

A technology of austenite grain boundary and corrosive agent, applied in the field of display of fine austenite grain boundary of low carbon microalloy steel, can solve the problems of explosion danger, damage to instruments, etc., and achieve the effect of increasing safety and reducing harm to human body

Active Publication Date: 2021-08-13
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The picric acid experiment process is also very dangerous. If it is accidentally splashed on the instrument, it will damage the instrument, and there is a danger of explosion during the heating process.

Method used

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  • Corrosive agent for fine austenite grain boundary display in low carbon microalloyed steel
  • Corrosive agent for fine austenite grain boundary display in low carbon microalloyed steel

Examples

Experimental program
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Effect test

Embodiment 1

[0011] Example 1: The composition of the etchant used for the display of fine austenite grain boundaries in low-carbon microalloyed steel is 97.5% saturated citric acid solution, saturated FeCl 3 Solution 1%, detergent 1.5%.

[0012] (1) Add 10 mL of deionized water to two beakers, add citric acid to beaker A to saturation, and add FeCl to beaker B 3 to saturation, then use a gel-tip dropper to saturate the FeCl 3 Add the solution dropwise into beaker A, then add detergent and stir evenly; the amount of corrosive agent can be determined according to the sample and beaker capacity, and the corrosive agent is required to soak the sample;

[0013] (2) Put the beaker A into a water bath heating furnace and heat it to 70°C, put the polished steel sample into the beaker A with the polished side up, and keep it warm for 4 minutes. In order to prevent over-corrosion, the corrosion process should be taken every minute Come out to observe the polished surface; after the corrosion is c...

Embodiment 2

[0015] Example 2: The etchant composition used for the display of fine austenite grain boundaries in low-carbon microalloyed steel is saturated citric acid solution: 98%, saturated FeCl 3 Solution 1%, detergent 1%.

[0016] When in use, heat the etchant to 60°C, put the polished steel sample into the etchant, keep the polished surface up, and keep warm for 5 minutes; take out the steel sample and clean it, wipe the polished surface with absolute ethanol, and dry it to obtain Metallographic phase with clear grain boundaries; and the grain boundaries corroded by the etchant are completely displayed, and the corrosion effect is stable.

Embodiment 3

[0017] Example 3: The composition of the etchant used for the display of fine austenite grain boundaries in low-carbon microalloyed steel is 99% saturated citric acid solution, saturated FeCl 3 Solution 0.5%, detergent 0.5%.

[0018] When in use, heat the etchant to 80°C, put the polished steel sample into the etchant, keep the polished surface up, and keep warm for 3 minutes; take out the steel sample and clean it, wipe the polished surface with absolute ethanol, and dry it to obtain Metallographic phase with clear grain boundaries; and the grain boundaries corroded by the etchant are completely displayed, and the corrosion effect is stable.

[0019] The invention is suitable for corroding small austenite grain boundaries of low-carbon microalloy steel, and the corrosion effect of the steel sample with too high carbon content and large grain boundaries is not good.

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PUM

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Abstract

The invention discloses a corrosive agent for the display of fine austenite grain boundaries of low-carbon microalloyed steel. Its composition and volume percentage are 97.5-99% of saturated citric acid solution, saturated FeCl 3 The solution is 0.5-1%, and the detergent is 0.5-1.5%; the etchant of the present invention is used to display the fine austenite grain boundaries of low-carbon microalloyed steel, and the experimental results show that a metallographic phase with clear grain boundaries can be obtained; the etchant of the present invention corrodes The grain boundary is completely displayed, and the corrosion effect is stable. The most important thing is that this corrosive formulation and use process do not require picric acid, which reduces human harm and increases laboratory safety.

Description

technical field [0001] The invention belongs to the field of displaying fine austenite grain boundaries of low-carbon micro-alloy steels, in particular to an etchant capable of clearly displaying the grain boundaries of low-carbon micro-alloy recrystallized fine austenite grains and a method for using the same. Background technique [0002] In the past, the austenite grain boundary of steel was displayed by immersing the polished steel sample in supersaturated picric acid and heating it in a water bath (hot corrosion method); but this method is unstable, and the sample corroded by picric acid will appear corrosion Inhomogeneous phenomenon, there will be partial over-corrosion (coarse grain boundaries) and some grain boundaries will not appear. At the same time, picric acid is very harmful, if the human body is exposed to a large amount or for a long time, it will cause contact dermatitis, conjunctivitis and bronchitis, and there will be reactions such as headache, dizziness,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/32C23F1/28
CPCC23F1/28G01N1/32
Inventor 曹建春吴雍壕周晓龙高鹏杨银辉郝天赐
Owner KUNMING UNIV OF SCI & TECH
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