Method for measuring particle size distribution and content of globular oxide inclusions in steel

Abstract

The invention relates to a method for rapidly measuring the particle size distribution and the content of globular oxide inclusions in steel by use of the laser-induced breakdown spectroscopy principle. The method can rapidly represent the particle size distribution and the content of globular oxide inclusions in steel and can evaluate the cleanliness of a steel and iron material. The analysis process comprises the steps of preparing samples; determining a sample labeled zone; analyzing the relative distribution of the globular oxide inclusions by use of a SEM (scanning electron microscope) and EDS (electronic data switching); creating the calibration curve of globular oxide inclusions; determining the relative distribution of the particle size of the globular oxide inclusions in the analysis sample by use of the laser-induced breakdown spectroscopy; grading the globular oxide inclusions; measuring the content of the globular oxide inclusions. The method has the advantages of high analysis speed, large scanning area and no limitation of the electrical conductivity of the sample, can measure the particle size distribution of globular oxide inclusions in steel, evaluate the grades of the inclusions, and also can obtain the information of the content of the inclusions while acquiring the particle size distribution of the inclusions.

Description

technical field [0001] The invention belongs to the technical field of surface micro-area analysis in the field of material science, and in particular relates to a characterization method for rapidly determining the particle size distribution and content of spherical oxide inclusions in steel by using laser-induced breakdown spectroscopy, thereby improving the cleanliness and content of steel materials. evaluate its performance. Background technique [0002] The size, distribution and content of spherical oxide inclusions in steel have an important impact on the properties of steel materials. For plates, bearing steels, heavy rail steels, etc., they directly affect their fatigue life and other properties; for automotive sheets It directly affects the quality of its surface coating; for high-chromium alloy steel, spherical oxide inclusions affect its surface finish; if the content of spherical oxide inclusions in molten steel is too high, it will reduce the fluidity of molten...

AI Technical Summary

Problems solved by technology

[0004] The existing methods for analyzing the content of spherical oxide inclusions in steel include wet analysis and single spark discharge atomic emission spectrometry. The disadvantage of atomic emission spectrometry to analyze the content of spherical oxide inclusions in steel is that the collection sample volume is small. In addition, the size of the spark discharge spot determines that it is difficult to analyze small samples.

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