The Simple Determination Method of Precipitates in Steels by X-ray Diffraction Technique with Y₂O₃ as Internal Standard Materials

Abstract

The simply quantitative state analysis method of precipitates in steels has been established by X-ray diffraction technique with adding constant amount of Y₂O₃ as internal standard material.
The procedure is as follows :
(1)The residues extracted from steels by potentiostatic electrolysis are dispersed in methanol with 100 ml beaker.
(2)5.0 ml of Y₂O₃ dispersing solution (50 mg/250 ml methanol) is added in above mentioned solution and after that this solution is dispersed by ultrasonic vibration.
(3)This solution is filtrated and the residues are collected on filter.
(4)The X-ray diffraction pattern of residues is measured and its peak intensity ratios of precipitates to Y₂O₃ are calculated. The amount of precipitates are determined from these peak intensity ratios by calibration curves, which are preliminaly made from relation between peak intensity ratio and the amount of precipitates.
This method can simply estimate state of precipitates quantitatively compared with conventional extracted residues decomposition method.