A Method for Quickly Measuring Carbon Content in Iron and Steel

Abstract

A method to quickly measure the carbon content in steel based on laser-induced breakdown spectroscopy (LIBS) technology. First, a group of steel samples with known carbon content are selected as calibration samples. For each calibration sample, use the LIBS system to obtain its spectrum, and calculate the intensity of the carbon atom line and the intensity of the carbon two (C2) molecule line band from the spectrum. Using the carbon content as the dependent variable and the intensity of the carbon atom spectral line and the intensity of the C2 molecular spectral line band as independent variables, the calibration model is obtained by fitting. For the steel sample to be tested with unknown carbon content, first use the LIBS system to obtain its spectrum, and find the intensity of the carbon atomic spectral line and the intensity of the C2 molecular spectral line band in the spectrum of the steel sample to be tested, and then substitute it into the calibration model, that is The carbon content in the steel sample to be measured can be obtained. This method can significantly improve the accuracy of carbon content detection in steel.

Description

technical field [0001] The invention relates to a method for quickly measuring the content of carbon elements in steel and belongs to the field of laser induced breakdown spectroscopy (Laser Induced Breakdown Spectroscopy, LIBS). The basic principle of the method of the present invention is to use LIBS to measure the carbon content in iron and steel. When selecting spectral lines, not only the characteristic spectral lines of carbon atoms have been selected, but also the C 2 The spectral bands of the molecules are used as the spectral lines for the analysis. The use of LIBS to measure carbon content in steel has the advantages of fast speed and no pretreatment of samples, which is convenient for on-site online measurement. Select both the carbon line and the C 2 The molecular spectral line band is used for analysis, which can more accurately reflect the relationship between the carbon content and the spectral signal, and greatly improve the measurement accuracy and accuracy....

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the current existing measurement methods cannot meet the on-line rapid measurement, the present invention proposes to use LIBS technology to measure the carbon content in steel; in order to overcome the problem of insufficient precision and accuracy of LIBS technology in carbon content detection, the present invention proposes In order to use the carbon atomic line and the carbon two (C 2 ) molecular spectral line with two kinds of spectral line information, compared with the conventional LIBS that only uses the carbon atomic spectral line information, it greatly improves the precision and accuracy of the measurement

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