Improvements in quantitative analysis of steel composition by laser-induced breakdown spectroscopy at atmospheric pressure using an infrared Nd : YAGlaser

The experimental conditions and procedure for quantitative analysis of stee l by laser-induced breakdown spectroscopy in argon at atmospheric pressure using an infrared Nd:YAG laser have been studied. Satisfactory analytical r esults have been obtained for the determination of C, Si, Cr, and Ni conten ts in low-alloyed steels. The lens-to-sample distance is shown to be a rele vant parameter, which can be selected at each pulse energy to enhance the l ine intensities and the repeatability of measurements. A higher precision h as been obtained for line-intensity ratios (0.9-2.5% relative standard devi ation for concentrations higher than 0.1%) than for absolute intensity meas urements. The calibration curves for all the elements have correlation coef ficients above 0.999. Detection limits are in the range 6-80 ppm.