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Metallographic specimen preparation method

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

Active Publication Date: 2019-06-07
DAYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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Examples

Experimental program
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preparation example Construction

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

[0042] 101. Clean the polished sample and put it into container A filled with alcohol, and the alcohol liquid surface is not over the sample;

[0043] 102. Place container A containing alcohol and samples in an ultrasonic cleaning machine, and vibrate ultrasonically for 5-10 minutes;

[0044] During ultrasonic vibration, if the vibration time is too short, the effect will be poor. 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, and the alcohol in the alcohol solution will volatilize, reduce the alcohol concentration, and weaken the water in the cracks of the sample. Or the oozing 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 p...

Embodiment 1

[0064] A large number of cracks were found in the 40Cr workpiece produced by a factory after quenching. The cracked test piece was cut and ground into a metallographic sample, which was corroded and observed according to conventional methods. figure 2 As shown, the crack edge is seriously polluted, whether there is decarburization at the crack edge, and whether the structure is normal is not clear at all. 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, rinse with water, rinse with alcohol, and corrode with corrosive solution. , alcohol rinse, hair dryer to dry.

[0065] Adopt method provided by the present invention to prepare metallographic sample:

[0066] Cut out the cracked part of 40Cr steel as a sample, polish it successively with a grinding wheel, 600# coarse sandpaper, 1000# fine san...

Embodiment 2

[0069] After forging, the 42CrMo workpiece in a factory found that the surface was cracked and the defect was honeycomb. The defect test piece was cut and polished to form a metallographic sample. After being corroded by 2% nitric acid alcohol solution by traditional corrosion method, it was observed with a metallographic microscope. Figure 4 As shown, the contamination near the defect is serious and the organization is not clear. The traditional corrosion method refers to that the sample is ground by grinding wheel, 600# coarse sandpaper grinding, 1000# sandpaper grinding, rough polishing of 7 micron silicon oxide polishing liquid, fine polishing of 2.5 micron silicon oxide polishing liquid, washing with water, washing with alcohol, corrosive solution Corrosion, alcohol rinse, hair dryer to dry.

[0070] Adopt method provided by the present invention to carry out metallographic sample preparation:

[0071] Cut the 42CrMo workpiece defect test block as a sample, polish it su...

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Abstract

The invention relates to a metallographic specimen preparation method. The method includes the following steps that: a polished specimen is cleaned and placed in a container A containing alcohol, andthe liquid surface of the alcohol submerges the specimen; the container A containing the alcohol and the specimen is placed in an ultrasonic wave washing machine so as to be subjected to ultrasonic vibration; the specimen which has been subjected to ultrasonic vibration is taken out from the container A and is placed in a container B containing alcohol, and the specimen stands still in the container B containing alcohol with the liquid surface of the alcohol submerging the specimen; the specimen is taken out from the container B, and is blown to be dried, and the dried specimen is immersed inan etching solution, after the polished surface of the specimen is completely etched, the specimen is taken out and blown to be dried; the dried specimen is placed in a container C containing alcoholso as to be subjected to ultrasonic vibration, and the specimen which has been subjected to ultrasonic vibration is taken out from the container C, and is placed in a container D containing alcohol, and the specimen stands still in the container D containing alcohol; and the specimen is taken out and blown to be dried, and therefore, metallographic microstructure observation can be performed. Withthe method adopted, water or corrosive liquid will not ooze out from the crack of the specimen, and therefore, the accuracy of the metallographic microstructure analysis of the crack defect sample can be improved.

Description

technical field [0001] The invention belongs to the technical field of metallographic sample preparation, in particular to a method for preparing a metallographic sample, and is especially suitable for the preparation of a metallographic sample 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 judge the nature of cracks. In order to correctly judge the real cause of cracks, the sample preparation process is particularly critical, and the false appearance caused by improper sample preparation must be eliminated. Generally speaking, the sample preparation process for observing the metallographic structure includes: grinding wheel grinding, 600# coarse sandpaper grinding, 1000# sandpaper grinding, rough polishing with 7 micron polishing liquid, fine polishing with 2.5 micron polishing liquid, water rinse, alcohol rinse, Corrosion with corrosive solution, rinse with...

Claims

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Application Information

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Patent Type & Authority Applications(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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