Method for quantitatively analyzing inclusions in steel under laser microscope

Abstract

The invention relates to a method for quantitatively analyzing inclusions in steel under laser microscope, comprising the following steps: 1) sampling; 2) polishing; 3) observing and imaging under a microscope; 4) analyzing data, wherein the data of inclusions in each digitalized photo is directly obtained after analysis, and the inclusion A method grading of single sample is obtained; and 5) splicing and analyzing the photo, wherein the inclusion B method grading of single sample is calculated through measurement. Through the application of the laser microscope and accessories, the surface of the whole metallic phase sample can be quickly scanned, the light microscope photos with different areas on a detection surface are obtained respectively by scanning one or more photos continuously, micro deviation of light on the surface of the sample is eliminated through software shadow rectification processing, the inclusions on the surface of the steel sample are sieved by utilizing the gray difference in the photo, the information of different types of inclusions in the whole surface to be detected such as size, length-diameter ratio, shape and the like are automatically calculated and counted through software after laser imaging, and the inclusions are graded with reference to national standard.

Description

technical field [0001] The invention belongs to the technical field of quantitative analysis methods for impurities in steel, in particular to a method for quantitatively analyzing inclusions in steel under a laser microscope. Background technique [0002] Harmful inclusions in steel mainly exist in the matrix as a separate phase, whether they are ductile or non-ductile inclusions will damage the continuity of the steel matrix and become a potential source of matrix damage at the grain boundary point, which greatly affects the mechanical properties and hot workability of steel. In order to detect and analyze the content and distribution of inclusions in steel, the metallographic detection method is mainly used to observe the longitudinal section of the polished steel sample, and refer to the national standard of the People's Republic of China "GB / T10561-2005 Non-metallic inclusions in steel Content Determination Standard Rating Chart Microscopic Detection Method" is used to...

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Problems solved by technology

[0003] When metallographic method is used to grade inclusions in steel samples, inspectors are required to observe the entire plane field of view of the sample. Referring to the national standard "GB / T10561-2005", method A requires subjective judgment when selecting the worst field of view , especially in the inclusion-intensive area, there will be errors when selecting the detection field of view for rating; the B method rating needs to count the content and size information of a large number of inclusions in the field of view, the amount of data is large, and the workload of conventional manual statistics is very large

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