Preparation method of metallographic samples

Abstract

The invention discloses a preparation method of metallographic samples. The preparation method includes the following steps: S1, a step of sampling, namely a step of cutting samples at the edge and center of a sample object; S2, a step of inlaying, namely a step of slowly guiding flows of colloid into an inlaying die through galvanized iron wires for curing; S3, a step of grinding; S4, a step of polishing; and S5, a step of corrosion, namely a step of corroding a metallographic detected surface with a corrosion solution. The method can effectively prevent bubbles from forming in the metallographic samples, improve the polishing effect, shorten the polishing time, facilitate metallographic observation of the metallographic detection surface, and improve the detection accuracy.

Description

technical field [0001] The invention belongs to the technical field of material detection, in particular to a method for preparing a metallographic sample. Background technique [0002] Metallographic analysis is a method for people to study the size, shape, distribution, quantity and properties of metal and alloy microstructures through metallographic microscopy. Due to the different research materials, the preparation methods of metallographic samples are various, and improper operations may form "pseudo-structures" and lead to erroneous analysis. In order to show the details of the structure clearly and not to cause any structural changes on the surface of the sample during the sample preparation process, the procedure can usually be divided into several main processes such as sampling, mounting, and polishing. The polishing time of the sample is longer, and there are metal particles and grinding marks on the polished surface, which affect the smoothness of the detection...

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Problems solved by technology

[0002] Metallographic analysis is a method for people to study the size, shape, distribution, quantity and properties of metal and alloy microstructures through metallographic microscopy. Due to the different research materials, the preparation methods of metallographic samples are various, and improper operations may form "pseudo-organizations" leading to erroneous analysis

In order to show the details of the structure clearly and not to cause any structural changes on the surface of the sample during the sample preparation process, the procedure can usually be divided into several main processes such as sampling, mounting, and polishing. The sample has been polished for a long time, and there are metal particles and grinding marks on the polished surface, which affects the smoothness of the detection surface and seriously affects the results of metallographic inspection.

[0003] Chinese Patent Publication No. CN 103759993 U discloses a method for preparing a metallographic sample. The specific operations include: first, sampling the metallographic sample; secondly, inlaying the metallographic sample; again, polishing the metallographic sample; Acid etching and rinsing of the surface to be polished of the phase sample: put the surface to be polished into the nitric acid alcohol solution for etching and rinse with water; finally, the metallographic sample is polished, although the nitric acid alcohol solution is added before polishing. The abrasive particles and metal abrasive particles left on the grinding surface will not leave obvious grinding marks on the polished sample, which improves the surface smoothness of the metallographic sample, but it is easy to generate air bubbles during the mounting process , which affects the clarity of observation. After the sample is mounted, it is difficult to remove the mounted sample from the mold, which may easily cause the mounted sample to be scrapped.

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