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A kind of metallographic sample preparation method

A metallographic sample and crack technology, applied in the field of metallographic sample preparation, can solve the problem of inability to clearly observe the metallographic microstructure, and achieve the effect of uniform corrosion and clear and accurate observation.

Active Publication Date: 2022-07-29
DAYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the figure that the metallographic microstructure at this position cannot be clearly observed due to the presence of liquid continuously seeping from the cracks on both sides of the sample crack

Method used

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  • A kind of metallographic sample preparation method
  • A kind of metallographic sample preparation method
  • A kind of metallographic sample preparation method

Examples

Experimental program
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Effect test

preparation example Construction

[0041] A metallographic sample preparation method, such as figure 1 shown, including the following steps:

[0042] 101. Clean the polished sample, put it into container A containing alcohol, and the alcohol level does not pass the sample;

[0043] 102. Place the container A containing the alcohol and the sample in the ultrasonic cleaning machine, and ultrasonically vibrate for 5-10min;

[0044] During ultrasonic vibration, if the vibration time is too short, the effect will be poor, and if the vibration time is too long, the sample will easily heat up, which will cause the temperature of the alcohol in the beaker to be too high, the alcohol in the alcohol solution will volatilize, reduce the alcohol concentration, and weaken the water in the crack of the sample. Or the exudation speed of the polishing liquid, so the vibration time should not be too long or too short, preferably 5-10min, more preferably 6-8min, can be 6min, 7min, 8min.

[0045] The vibration frequency is pre...

Embodiment 1

[0064] The 40Cr workpiece produced by a factory was found to have a large number of cracks after quenching, and the crack test block was cut and ground into a metallographic sample, which was observed after corrosion according to conventional methods. figure 2 As shown in the figure, the crack edge is seriously polluted, whether there is decarburization at the crack edge, and whether the structure is normal, it is completely unclear. The conventional method means that the sample is ground by grinding wheel, 600# coarse sandpaper, 1000# sandpaper, rough polishing with 7 micron silicon oxide polishing liquid, fine polishing with 2.5 micron silicon oxide polishing liquid, rinsed with water, rinsed with alcohol, and corroded with corrosive liquid. , alcohol rinse, hair dryer drying.

[0065] Use the method provided by the present invention to prepare metallographic samples:

[0066] Cut the cracked part of 40Cr steel as a sample, and then put it into a beaker containing anhydrous...

Embodiment 2

[0069] A 42CrMo workpiece in a factory was found to have cracks on the surface after forging, and the defects were honeycomb-shaped. The defect test block was cut and polished to form a metallographic sample, which was corroded with 2% nitric acid alcohol solution by traditional corrosion methods and observed with a metallographic microscope. Figure 4 As shown, the vicinity of the defect is heavily contaminated and poorly organized. The traditional corrosion method means that the sample is ground by grinding wheel, 600# coarse sandpaper, 1000# sandpaper, rough polishing with 7 micron silicon oxide polishing liquid, fine polishing with 2.5 micron silicon oxide polishing liquid, rinsed with water, rinsed with alcohol, and rinsed with corrosive liquid. Corrosion, alcohol rinse, hair dryer.

[0070] Use the method provided by the present invention to prepare metallographic samples:

[0071] Cut the 42CrMo workpiece defect test block as a sample, and after polishing it with grind...

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Abstract

The invention relates to a metallographic sample preparation method. The polished sample is cleaned and placed in a container A containing alcohol, and the alcohol level does not cover the sample; the container A containing alcohol and the sample is placed in an ultrasonic wave Perform ultrasonic vibration in the cleaning machine; take out the ultrasonically vibrated sample from container A and put it in container B containing alcohol to stand, the alcohol liquid level does not cover the sample; take out the sample from container B and blow dry Then immerse it in the corrosive solution, and after the polished surface of the sample is completely corroded, take out the sample and blow it dry; put the blown dry sample into the container C containing alcohol again for ultrasonic vibration , and then take out the ultrasonically vibrated sample from container C, put it into container D containing alcohol and let it stand; take out the sample and blow it dry, and then observe the metallographic microstructure. The method prevents the leakage of water or corrosive liquid in the crack of the sample, and improves the accuracy of the analysis of the metallographic microstructure of the sample with crack defect.

Description

technical field [0001] The invention belongs to the technical field of metallographic sample preparation, and in particular relates to a metallographic sample preparation method, which is especially suitable for the preparation of metallographic samples with crack defects. Background technique [0002] In the process of failure analysis, the analysis of cracks is often encountered, and it is required to accurately determine the nature of the cracks. In order to correctly determine the real cause of cracks, the sample preparation process is particularly critical, and the illusion caused by improper sample preparation must be eliminated. Generally speaking, the sample preparation process for observing metallographic structure includes: grinding with grinding wheel, grinding with 600# coarse sandpaper, grinding with 1000# sandpaper, rough polishing with 7 micron polishing liquid, fine polishing with 2.5 micron polishing liquid, rinsing with water, rinsing with alcohol, Corrosi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N1/30G01N1/32G01N1/34
Inventor 李波杨娥陈家新杨智周扬
Owner DAYE SPECIAL STEEL CO LTD
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