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Metallographic sample preparation method of CrMo steel

A metallographic sample preparation and electrolyte technology, which is applied in the preparation of test samples, etc., to achieve the effects of simple and easy operation, conducive to metallographic observation, and promotion of corrosion.

Active Publication Date: 2018-11-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a metallographic sample preparation method for CrMo steel, which solves the defect that acidic corrosion solution needs to be used in the corrosion process, and realizes the environmental protection of steel metallographic sample preparation

Method used

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  • Metallographic sample preparation method of CrMo steel
  • Metallographic sample preparation method of CrMo steel
  • Metallographic sample preparation method of CrMo steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Preparation of the working electrode of the sample: the sample used is 35CrMo steel, and a square sample with a size of 10mm×10mm is obtained by an electric spark cutting machine, and then the wire is welded on the surface of the sample and then sealed with epoxy resin. Obtain the primary sample electrode. Roughly grind the primary sample electrode on 180#, 320#, 600# sandpaper, and then finely grind it with 800#, 1000#, 1200 sandpaper (when changing the sandpaper, use the same grinding direction as the previous sandpaper). vertical direction), and then mechanically polish it on a polishing machine with a diamond polishing paste of W1.5, so that its roughness Ra reaches 0.4 μm, and then the sample working electrode (its preparation and structural schematic diagram as shown in figure 1 shown).

[0022] (2) Electrolyte configuration: Pour 8g of sodium chloride and 392g of tap water into a clean container, and stir until the sodium chloride is completely dissolved to ...

Embodiment 2

[0026] (1) Preparation of the working electrode of the sample: the sample used is 35CrMo steel, and a square sample with a size of 10mm×10mm is obtained by an electric spark cutting machine, and then the wire is welded on the surface of the sample and then sealed with epoxy resin. Obtain the primary sample electrode. Roughly grind the primary sample electrode on 180#, 320#, 600# sandpaper, and then finely grind it with 800#, 1000#, 1200 sandpaper (when changing the sandpaper, use the same grinding direction as the previous sandpaper). Vertical direction), and then use W1.5 diamond polishing paste to mechanically polish it on a polishing machine, so that the roughness Ra reaches 0.4 μm, and the working electrode of the sample is obtained.

[0027] Electrolyte configuration: Pour 14g of sodium chloride and 386g of tap water into a clean container, and stir until all the sodium chloride is dissolved to make a NaCl solution with a concentration of 3.5%, and heat the solution to 30...

Embodiment 3

[0031] (1) Preparation of the working electrode of the sample: the sample used is 35CrMo steel, and a square sample with a size of 15mm×15mm is obtained by an electric spark cutting machine, and then the wire is welded on the surface of the sample and then sealed with epoxy resin. Obtain the primary sample electrode. Roughly grind the primary sample electrode on 180#, 320#, 600# sandpaper, and then finely grind it with 800#, 1000#, 1200 sandpaper (when changing the sandpaper, use the same grinding direction as the previous sandpaper). vertical direction), and then mechanically polish it on a polishing machine with W1.5 diamond polishing paste to make the roughness Ra reach 0.2 μm, that is, the working electrode of the sample is obtained.

[0032] Electrolyte configuration: Pour 16g of sodium chloride and 384g of tap water into a clean container, and stir until all the sodium chloride is dissolved to make a NaCl solution with a concentration of 4.0%, and heat the solution to 25...

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Abstract

The invention discloses a metallographic sample preparation method of CrMo steel. The method includes the following steps that 1, a sample working electrode is prepared; 2, an electrolyte is prepared,wherein a sodium chloride solution with the mass fraction of 2-4% is prepared as the electrolyte; 3, electrolytic corrosion is performed, wherein the sample working electrode in the step1 is soaked in the electrolyte in the step2, a saturated calomel electrode is adopted as a reference electrode, a platinum sheet is used as an auxiliary electrode, electrolytic corrosion is performed, after the corrosion is ended, the sample electrode is cleaned and dried, and then a CrMo steel metallographic sample is obtained. The new method for preparing the electrolyte is provided and displays chromium-molybdenum steel microstructures, price is low, preparation is convenient, and the problems are solved that in the prior art, corroding agents have toxin and are much harmful to health of human bodies and the environment. The method for displaying the chromium-molybdenum steel microstructures is provided, the corrosion efficiency is high, corrosion is rapid, and operation is simple and easy to master.

Description

technical field [0001] The invention belongs to the field of metallographic electrolytic corrosion of steel, and in particular relates to a metallographic sample preparation method of CrMo steel. Background technique [0002] Chromium-molybdenum steel has the characteristics of good hardenability, less tendency to temper brittleness, good high-temperature processability, good weldability, and good impact absorption performance, and is widely used in the manufacture of high-temperature resistant valves and pressure vessels. However, in the manufacturing process of chromium-molybdenum steel, there may be phenomena such as large grain size, obvious dendrite structure and cracking during thermal processing. The chrome molybdenum steel is very important. [0003] Metallographic detection and analysis is an important means to test the microstructure of steel (such as dendrites, precipitated phases, inclusions, microcracks, pores and grain size, etc.). In the steel manufacturing ...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/32
CPCG01N1/28G01N1/32
Inventor 周亚军江心李政毛大恒石琛
Owner CENT SOUTH UNIV
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