The invention relates to a characterization method for the strengthening phase of a ferromagnetic alloy block and/or film. An optimum scheme includes: separating a strengthening phase of nano to micron size in a ferromagnetic alloy from an alloy matrix to obtain an electrolyte solution containing the strengthening phase; then conducting dilution by anhydrous ethanol and ultrasonic dispersion, thendripping the obtained solution to an ultra-thin carbon support film, and performing drying to obtain an electron microscope sample; and then using an electron microscope for structural observation and characterization. The method provided by the invention can characterize the morphology and structure of the strengthening phase less than 0.5micron in the ferromagnetic alloy, especially the strengthening phase less than 50nm in size. The strengthening phase separated by the method provided by the invention retains the original structure of the strengthening phase, and the method has the advantages of simplicity and high efficiency, easily available electrolytic conditions, simple operation and strong repeatability, and can be used for analysis and characterization of strengthening phases invarious ferromagnetic materials. The method provided by the invention effectively avoids the adverse effects of ferromagnetic alloy matrixes on electron microscope equipment and the detection process, and realizes the TEM/HRTEM structural characterization of the ferromagnetic alloy strengthening phase.

Characterization method for strengthening phase of ferromagnetic alloy block and/or film

The invention provides a method for detecting impurities in metal 3D (three-dimensional) printing nickel-based superalloy, which comprises the following steps: (S1) preparation of specimen; (S2) post-treatment of specimen; (S3) electrolysis of specimen: electrolysis equipment is utilized for electrolyzing a specimen, prepared electrolyte is injected into an electrolytic cell, argon is injected toexpel the air in the electrolyte after covering, the power is switched on, electrolysis is started, and in the process of electrolysis, the change of the pH value of the solution is regularly detectedand adjustment is made in time, so that the pH value is kept between 3 and 7; (S4) detection and analysis of anode mud: when electrolysis is complete, the power and argon are cut off, an anode bag istaken down to collect anode mud, the anode mud undergoes elutriation, magnetic separation and selection, so that impurity particles are obtained, and particle size statistics are collected under an optical microscope; the impurity particles are put onto conductive adhesive, and component analysis is carried out by means of a scanning electron microscope and an energy disperse spectroscopy.

Method for detecting impurities in metal 3D (three-dimensional) printing nickel-based superalloy

The invention belongs to the technical field of ferrous metallurgy and particularly relates to a method for extracting and separating an oxide and a sulfide in sulfur-containing free-cutting steel. The method comprises the steps of (S1) the preparation of electrolyte, (S2) the pretreatment of a steel sample surface, (S3) the separation of non-metallic impurities from a steel substrate, (S4) the collection of the impurities, (S5) magnetic separation, (S6-1) filtration and washing, (S6-2) the separation of the oxide and the sulfide, and (S7) filtration and washing. According to the method for extracting and separating an oxide and a sulfide in sulfur-containing free-cutting steel provided by the invention, the non-metallic impurities in the sulfur-containing free-cutting steel can be completely extracted and the separation of the oxide and the sulfide is realized, the operation is easy and simple, the cycle is short, and the method is easy to implement.

Method for extracting and separating oxide and sulfide in sulfur-containing free-cutting steel

The invention discloses a method for representing the distribution of non-metallic inclusions in a steel ingot. The method for representing the distribution of non-metallic inclusions in the steel ingot comprises the following steps: cutting the steel ingot to be represented, forming a section on the steel ingot to be represented, and obtaining a thin plate sample from the section; taking the thinplate sample as an anode to perform an electrolytic treatment, and collecting an electrolyte; performing ultrasonic cleaning on the thin plate sample after the electrolytic treatment to obtain a cleaning solution, and d combining the cleaning solution with the electrolyte to obtain a mixed solution; filtering the mixed solution to obtain total inclusion particles; performing magnetic separation treatment on the total inclusion particles to obtain non-metallic inclusions; separating the non-metallic inclusions according to the particle size, and counting the number of the non-metallic inclusions of different particle sizes; and obtaining the distribution of the non-metallic inclusions in the steel ingot to be represented through mathematical model fitting according to the number of the non-metallic inclusions. According to the invention, through the method of mathematical fitting, the density size distribution of the whole steel ingot can be derived according to the particle size distribution characteristics of the local sample.

Method for representing distribution of non-metallic inclusions in large-scale steel ingot by electrolytic method

The invention relates to the technical field of detection and analysis, and in particular relates to a method for characterizing a crystal structure of non-metallic inclusions in steel by using micro-area X-ray diffraction (Micro-XRD). According to the method, non-metallic inclusions in steel are extracted in an electrolysis or acid dissolution mode, extracted particles are gathered, purified andprepared into a sample, a high-quality micro-area X-ray diffraction detection sample is obtained, and the crystal structure of the detection particles can be determined through micro-area X-ray diffraction analysis. According to the method, the crystal structure, lattice parameters, phase types and other information of the non-metallic inclusions in the steel can be simply and effectively determined; the technical problems that an existing sample is difficult to prepare, an X-ray diffraction (XRD) detection result is not ideal and the like are solved by preparing a high-quality non-metallic inclusion powder sample in steel and setting reasonable micro-area X-ray diffraction detection parameters.

Method for characterizing crystal structure of non-metallic inclusions in steel by using micro-area X-ray diffraction

The invention relates to the technical field of quality detection of continuous casting production in ferrous metallurgy and particularly relates to a detection method for sulfur-containing inclusions in steel. According to the detection method, magnetic impurities in mixed liquid are removed in a magnetic separation manner, non-magnetic iron-containing compounds are converted into iron particles or magnetic iron-containing compounds, and the iron particles or the magnetic iron-containing compounds are removed in a magnetic separation manner, so that the influences caused by the non-magnetic iron-containing compounds to the detection of a target sulfur-containing inclusion are reduced, and a detection result is relatively accurate. Besides, finally obtained inclusion powder is placed on a conductive carrier so as to be subjected to SEM detection or EDS detection, so that a three-dimensional shape characteristic map of the inclusion can be obtained, the shape of the target sulfur-containing inclusion can be comprehensively and accurately expressed, and therefore, the reliable and accurate basis is provided for subsequent researches. Besides, the sulfur-containing inclusions are not separated from a steel sample by virtue of an acid dissolution method, so that the detection method is applicable to the sulfur-containing inclusions dissolvable in acid.

Detection method for sulfur-containing inclusions in steel

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Detection method for sulfur-containing inclusions in steel