Austenite crystal boundary display method under condition of high-temperature deformation of medium-carbon microalloyed steel

An austenite grain boundary and high-temperature deformation technology, applied in the field of physical detection, can solve the problems of low efficiency and difficulty in displaying austenite grains of high-strength ship plate steel, and achieve the effects of easy operation, guaranteed product performance, and simple method

Inactive Publication Date: 2013-06-19

SHANGHAI UNIV

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AI-Extracted Technical Summary

Problems solved by technology

[0003] Chinese patent CN101349621 discloses "a method for clearly displaying austenite grains of low-carbon and low-alloy steel". 100ml, CrO 3 8~10g, picric acid 1.6~2 g, ethylene oxide 2ml~4ml, this invention uses a specific etchant and a suitable etching method, which can clearly show the austenite grain boundary. Alloy austenite grain boundary display technology is blank, but the disadvantage is that the corrosion time of the sample is as long as 40~60min, and the efficiency is low

[0004] Chinese patent CN101368889A discloses "a method for displaying the original austenite grains of high-strength ship plate steel". The process steps of the method are rough grinding, fine grinding, polishin...

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Abstract

The invention relates to an austenite crystal boundary display method under the condition of high-temperature deformation of medium-carbon microalloyed steel, and belongs to the technical field of physical detection. The method comprises the following steps: preparing a sample, immediately quenching after high-temperature deformation, coarsely grinding, finely grinding, polishing, and putting the polished sample into a corrodent at 45 DEG C, wherein in the corrodent formula comprises 60ml tap water, 1.2-1.6g of picric acid, 0.4-0.5g of paste shampoo, 0.04-0.06ml dimethylbenzene, 0.08-0.12ml of hydrochloric acid, 0.06-0.1ml of hydrofluoric acid and 8-10ml of copper chloride; corroding the sample for 1-2 minutes, taking out the corroded sample after the surface of the sample become dark, cleaning with alcohol, and drying, wherein original austenite crystals can be relatively clearly observed under a microscope. The austenite crystal boundary display method has the advantage that the problem that austenite crystals cannot be relatively clearly observed under the condition of high-temperature deformation of the medium-carbon microalloyed steel. The method is simple to implement and convenient to operate.

Application Domain

Preparing sample for investigation

Technology Topic

Copper chloridePicric acid +10

Image

Examples

Experimental program(2)

Example Embodiment

[0020] Example 1

[0021] The chemical composition of the sample is as follows: C: 0.32%, Si: 0.25%, Mn: 1.61%, P: 0.012%, S: 0.002%, Ni: 0.006%, Cr: 0.017%, Mo: 0.003% , V: 0.110%, belongs to medium carbon microalloy steel;

[0022] The process and steps of this embodiment are as follows:

[0023] (1) Sample preparation: The sample is deformed at 1100℃, the deformation is 30%, and quenched immediately after deformation. The oxide scale on each surface of the sample is ground off on a grinder, and then the corroded surface is sequentially placed on 180# and 400 #, 600#, 800#, 1000# is finely ground on metallographic sandpaper, and finally the finely ground sample is polished on a polishing machine. The polishing agent is 1.5um diamond polishing paste and water is used as a lubricant. The polished sample is used Rinse with alcohol and observe the corroded surface under a microscope. There are no pits, pits, stains on the surface of the sample, and there are a few scratches.

[0024] (2) Corrosive agent formulation: tap water 60ml, picric acid 1.4g, shampoo 0.48g, xylene 0.05ml, hydrochloric acid 0.09ml, hydrofluoric acid 0.08ml, copper chloride 8mg.

[0025] (3) Corrosion agent preparation and corrosion method: take 60ml tap water, add shampoo and picric acid according to the formula, heat to 45℃, keep for 15min; after the shampoo is completely dissolved, add xylene, hydrochloric acid and hydrogen according to the reagent ratio Fluoric acid, copper chloride, and use a glass rod to stir the reagents evenly; use bamboo clamps to clamp the prepared sample into the corrosive agent, make the corroded surface face up, and etch for 95s; take it out after the sample surface becomes dark and use a large amount Rinse with alcohol, wipe the residual alcohol on the surface with absorbent cotton, and finally blow dry. Observe under a metallurgical microscope. It is found that there is a black film and tissue in some areas of the surface. Re-grind and polish with 1000# sandpaper, then put it in the corrosive agent to etch for 80s, then observe under the metallographic microscope, and finally get figure 1 The austenite grains shown.

Example Embodiment

[0026] Example 2

[0027] The chemical composition of the sample is as follows: C: 0.38%, Si: 0.28%, Mn: 1.7%, P: 0.008%, S: 0.004%, Ni: 0.008%, Cr: 0.015%, Mo: 0.008% , V: 0.115%, belongs to medium carbon microalloy steel;

[0028] The process and steps of this embodiment are as follows:

[0029] (1) Sample preparation: The sample is deformed at 900℃ with a deformation amount of 40%. It is quenched immediately after deformation. The oxide scale on each surface of the sample is ground off on a grinder, and then the corroded surface is sequentially placed on 180#, 400#, 600#, 800#, 1000# metallographic sandpaper is finely ground, and finally the finely ground sample is polished on a grinding and polishing machine. The polishing agent is 1.5um diamond polishing paste, and water is used as a lubricant. The sample was cleaned with alcohol, and the corroded surface was observed under a microscope. There were no pits, pits, or stains on the surface of the sample.

[0030] (2) Corrosive agent formula: tap water 60ml, picric acid 1.5g, shampoo 0.4g, xylene 0.04ml, hydrochloric acid 0.11ml, hydrofluoric acid 0.1ml, copper chloride 9mg.

[0031] (3) Corrosive agent preparation and corrosion method: take 60ml tap water, add shampoo and picric acid according to the formula, heat to 45℃, keep for 18min; after the shampoo is completely dissolved, add xylene, hydrochloric acid and hydrogen according to the reagent ratio Fluoric acid, copper chloride, stir the reagents evenly with a glass rod; use bamboo clamps to clamp the prepared sample into the corrosive agent, make the corroded surface face up, and corrode for 75s; take it out after the sample surface becomes dark and use a large amount Wash with alcohol, wipe the residual alcohol on the surface with absorbent cotton, and finally blow dry, observe under a metallurgical microscope to obtain figure 2 The austenite grains shown.

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