Analytical method of small-size impurities in steel

Abstract

The invention discloses an analytical method of small-size impurities in steel. The technical scheme adopted by the method comprises the steps of: (1) electrolyzing a sample in neutral organic electrolyte under constant current and voltage; (2) filtering a solution rich in a large amount of impurity particles after electrolysis by a filter membrane with superfine aperture so as to settle the small-size impurity particles on the membrane; (3) taking off the filter membrane, bonding the membrane on a supporting table and putting the filter membrane on a scanning electron microscope for observation, taking morphology photos and analyzing energy spectrum components; and (4) processing data, and conducting three-dimensional statistic analysis to all impurities in the sample or statistic analysis to specified type of impurities. The analytical method of small-size impurities in steel solves the problems that the electrolysis extraction method of bulk sample is not applicable to the traditional analysis method of small-size impurities, the impurities cannot be displayed completely in the analysis of impurities on a two-dimensional polishing surface, and the analysis of components is interfered with a matrix.

Description

Technical field [0001] The invention relates to a metal material analysis method, in particular to a spatial statistical analysis method for small non-metallic inclusions with a thickness of 5 μm or less in steel. Background technique [0002] At present, there are many analysis methods for studying inclusions in steel at home and abroad, such as cutting the steel sample cross-section, grinding and polishing it, putting it under an optical microscope or scanning electron microscope, observing the shape of the inclusions on the polished surface of the sample, and counting the inclusions. The size of the particles, the method of cutting the cross section can roughly understand the distribution, quantity, shape and size of the non-metallic inclusions in the steel, but the research on the inclusions is still limited by the metal grinding surface, because the polished surface shows A certain inclusion is actually only a part of the real inclusion particle, so it is not accurate t...

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Problems solved by technology

[0004] Since the large-scale electrolysis method uses acidic electrolytes such as hydrochloric acid to electrolyze and separate inclusions in steel, the acidic electrolyte is easy to dissolve and corrode unstable inclusions such as sulfide in steel, some large inclusions may be incompletely preserved, small The inclusions may be completely dissolved, and the subsequent elutriation process will also elutriate the fine inclusion particles, so the inclusion particles detected by the large-sample electrolysis method are relatively large, and the slightly smaller inclusion particles have a diameter of five or six. Ten microns, the larger particles have a diameter of two to three hundred microns, usually used for the study of large inclusions in continuous casting slabs, but not suitable for the detection and analysis of inclusions in clean steel products containing less small inclusions

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