Three-dimensional analysis method for non-metallic inclusions in metal material

Abstract

The present invention discloses a three-dimensional analysis method for non-metallic inclusions in a metal material. The method comprises the following steps: 1) cutting, grinding and polishing a to-be-analyzed sample to obtain a sheet sample; 2) electrolyzing the observation surface of the sheet sample to erode off one layer of the metal material, and make non-metallic inclusions not be eroded byelectrolysis to protrude from the observation surface and remain in situ on the sheet sample, and cleaning the sheet sample; and 3) placing the sheet sample processed in the step 2) on the sample table of the micro-instrument, adjusting the angle of the sample table, and observing the non-metallic inclusions from right above and side above angles to obtain a three-dimensional morphology of the non-metallic inclusions. According to the method provided by the present invention, information of the non-metallic inclusions and the surrounding matrix in the sample can be retained, and cooperated with the sample table to tilt, the three-dimensional distribution and morphology of the non-metallic inclusions can be observed from multiple angles, so that the difficulty of the preparation of the three-dimensional non-metallic inclusion analysis sample is effectively solved.

Description

technical field [0001] The invention relates to a metal material analysis method, in particular to a three-dimensional analysis method for non-metallic inclusions in metal materials. Background technique [0002] During the smelting process of metal materials, non-metallic inclusions will inevitably be produced. Taking iron and steel materials as an example, in the process of steelmaking, a small amount of slag, refractory materials and reaction products in smelting enter the second phase formed in molten steel, so that non-metallic inclusions with three-dimensional three-dimensional shape are produced in steel products. [0003] Non-metallic inclusions are generally considered harmful, and their type, composition, shape, content, size, distribution and other factors have certain effects on the properties of metallic materials. The commonly used analytical methods for studying non-metallic inclusions mainly include metallographic method, scanning electron microscope method,...

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Problems solved by technology

[0008] There are certain limitations when using these methods to study inclusions. For example, the metallographic method mainly analyzes the non-metallic inclusions in the steel section, and can only observe the two-dimensional morphology of the non-metallic inclusions on the metallographic section; although the electrolytic extraction method can observe The three-dimensional morphology of non-metallic inclusions, but only the non-metallic inclusions with large particle size can be extracted, and the distribution characteristics of non-metallic inclusions in the steel matrix cannot be observed; the acid etching method uses acid corrosion to make the non-metallic inclusions in the steel matrix Metallic inclusions are exposed, but non-metallic inclusions cannot be well observed in the three-dimensional picture in the pit

[0009] Emerging methods, such as the focused ion beam-electron beam dual-beam system (FIB), can perform multi-section etching through ion beams, and use computer software to fit the topography images of each layer to form three-dimensional spatial topography. Although the three-dimensional characteristics of non-metallic inclusions can be obtained through the lossy analysis of non-metallic inclusions, there is a certain deviation between the shape and size of non-metallic inclusions and the actual situation. At the same time, etching and subsequent three-dimensional reconstruction will take a lot of time, and the analysis has its shortcomings. At the same time, the equipment used at the same time is more expensive and difficult to popularize

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