Sample preparation method for metallographic examination of cemented carbide

Abstract

The invention discloses a sample production method used for hard alloy metallographic detection. The method comprises the steps of sample pre-grinding, sample coarse grinding, sample fine grinding, coarse polishing and finishing polishing. The sample production method has the characteristics of high safety coefficient, great energy saving and environmental protection, short sample production time, good effects, realization of production of a large batch of samples, and improvement of the metallographic sample production efficiency and the metallographic detection accuracy, and can be widely applied to the production of hard alloy metallographic detection samples.

Description

technical field [0001] The invention belongs to powder metallurgy cemented carbide material detection technology, in particular to a sample preparation method for cemented carbide metallographic detection. Background technique [0002] Cemented carbide has high hardness, strength and toughness. Since its inception, it has been widely used in various fields of modern industry, especially in cutting tools, mining tools and various wear-resistant products. [0003] At present, the performance testing of alloys mainly relies on physical testing and metallographic testing, and the accuracy of metallographic testing not only depends on the rich experience of testing personnel, but also requires high-quality sample preparation. It can be said that metallographic sample preparation directly affects metallographic testing. . At present, the sample preparation for metallographic testing uses an automatic grinding and polishing machine. After the sample is flattened and polished, the ...

AI Technical Summary

Problems solved by technology

The sample preparation cycle of this process is long, the life of the grinding disc is short, the cost of consumables is high, and the sample preparation effect for coated alloys and high-cobalt alloys is not ideal, and black spots are prone to occur, which affects the test results

Usually the quality of the grinding disc is poor, the service life is too short, the grinding time is long, the ability to remove scratches in each process is weakened, and the final polished mirror surface will have scratches (such as figure 1 shown)

Especially high-cobalt alloys and coated alloys are prone to black spots, and such metallographic surfaces cannot be detected (such as figure 2 shown)

On the basis of a small amount of black spots and scratches, the alloy structure picture is corroded, the WC structure is incomplete, and the boundary is not clear enough (such as image 3 shown), which affects the judgment of the results

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