Определение содержания легких элементов по совмещенным спектрам рентгеновской флуоресценции и дифракции

Abstract

The method was developed for analysis of materials using the combined spectra of X-ray fluorescence and diffraction. By the example of low-alloyed steel standards, it was shown that the specially calculated X-ray scheme with a secondary target allowed reducing the distance between the sample and the detector to Х = 5…6 mm and obtaining the structure reflections of phases under control (cementite and ferrite) in the ranges of the X-ray fluorescent spectrum free of analytical lines for the sample analyzed. That gives a possibility to carry out the quantitative phase analysis for cementite (Fe3C) by intensities of structure reflections, and using these data to determine the carbon content in the steel. All the rest elements are determined by fluorescence line intensities; due to the small X distance, the thresholds of detectability obtained using the portable non-vacuumed analyzer for light elements in steels, bronzes, and aluminium alloys, are found to be similar to the values for powerful vacuumed XRF instruments.