Instrument analysis method for rapidly determining content of occluded foreign substance in material

Abstract

The invention discloses an instrument analysis method for rapidly determining content of an occluded foreign substance in a material. The cleanliness of the material can be evaluated by accurate determination of the content of the occluded foreign substance in the material. The method comprises the following analysis processes: putting a sample into a sample box and placing into a sample chamber (3) charged by an inert protective gas; carrying out surface scanning analysis on the sample under the optimal instrument parameter condition; eliminating an abnormal value of all collected signal in a loop iteration manner according to Nalimov criterion; calculating the mean value and standard deviation of residual data; taking the standard deviation which is three times of the mean value as threshold strength for distinguishing the signal of the occluded foreign substance; building a mathematic model to carry out accurate and quantitative analysis on the content of the occluded foreign substance in the material on the basis of determining the threshold strength. Compared with the traditional wet process and single spark discharge atomic spectral analysis, the method has the advantages of being fast in analysis speed, high in sensitivity and the like, can analyze tiny, shaped and non-conductive material samples, and can be applied to rapid quantitative characterization of the occluded foreign substance content in the material.

Description

technical field [0001] The invention relates to a quantitative analysis method for materials, in particular to an instrumental analysis method for quickly measuring the content of inclusions in materials. Background technique [0002] The inclusions in the material have a great impact on the main properties of the material such as mechanical cutting, surface finish, fracture toughness, and crack formation. For example, inclusions on the surface of plates, bearing steel, and heavy rail steel directly affect the fatigue life of the workpiece and Other performances directly affect the quality of the surface coating for automobile thin plates, for cutting steels, sulfide inclusions have a significant impact on its cutting performance, and for high chromium alloy steels, oxide inclusions affect the surface finish, etc. [0003] In the prior art, methods for analyzing inclusion content in materials include wet analysis and single spark discharge atomic emission spectrometry. Wet ...

AI Technical Summary

Problems solved by technology

Wet analysis needs to dissolve the sample with acid. The disadvantage of this method is that the sample pretreatment is very cumbersome and the analysis period is long. It is not suitable for fast furnace analysis.

The single spark discharge atomic emission spectrometry uses the abnormal signal generated by the single spark discharge to analyze the content of inclusions in the material. Samples with small size or irregular shape; the requirement of spark discharge on sample conductivity limits its ability to analyze non-conductive materials such as non-metals

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