The invention discloses a phase field simulation method for forecasting phase change of a peritectic steel solidification process. The phase field simulation method includes the steps: S1 acquiring the free energy density of each phase in the solidification process, and acquiring solid/liquid and solid/solid interface movement dynamic parameters and microstructure evolution behaviors by high-temperature laser scanning confocal microscope in-situ observation experiments and a DSC (dynamic stability control) simultaneous thermal analyzer; S2 building a phase field model according to the free energy density and the dynamic parameters, and calculating a phase field control parameter result value by a phase field control equation; S3 coupling a solute field control equation and calculating a solute field control parameter result value; S4 visualizing the two control parameter result values to obtain a phase change image of the peritectic steel solidification process. Peritectic reaction andtransformation of the peritectic steel solidification process can be reproduced, a visual forecasting method is provided for controlling heat crack behaviors caused by phase change, and theoretical guidance can be provided for peritectic steel continuous casting billet surface crack control and efficient continuous casting production.

Phase field simulation method for forecasting phase change of peritectic steel solidification process

The invention belongs to the technical field of phase field methods, and discloses a phase field analysis method for simulating the phase change of a [Gamma]-TiAl alloy under a non-isothermal condition. Through the thermodynamics and dynamics parameters of an alloy system, an initialization condition is determined; according to the crystal structure of an intermetallic compound in the alloy, a sublattice model is used for constructing a chemical free energy model; meanwhile, a gradient descent method is used for calculating a corresponding atomic occupancy ratio; a corrected potential well function is used for coupling of a relationship between the chemical free energy of each phase and a structure field variable [Eta]; meanwhile, elastic energy is added to construct a system free energy function; the constructed function is substituted into a phase field equation; the result values of the structure field variable and an ingredient field variable are calculated; and then, visualizationprocessing is carried out to obtain a corresponding organization evolution diagram, and the results are analyzed. By use of the method, grain evolution processes at different temperatures and tissueevolution rules under different cooling rates can be simulated, and a reference is provided for researching the phase change process of the intermetallic compound.

Phase field analysis method for simulating phase change of [Gamma]-TiAl alloy under non-isothermal condition

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 provides a method for forecasting a continuous-casting-production casting blank microstructure. The method includes the steps that device parameters and technology parameters of a continuous casting device producing casting blanks with to-be-analyzed steel grades are collected; according to parameters of the to-be-analyzed steel grades, thermal physical parameters of the steel grades are determined; a pre-established macro-and-micro multi-scale mathematical model is used in cooperation with the device parameters, the technology parameters and the thermal physical parameters, and structure information of the casting blanks corresponding to the current continuous casting device is forecasted. By means of the method, a continuous-casting-blank solidification structure can be well forecasted, and direct and reliable information is provided for optimizing the continuous-casting-crystallizer technology condition.

Method for forecasting continuous-casting-production casting blank microstructure

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

The invention relates to a size prediction method of a MnS inclusion in a steel continuous casting blank. The method comprises the following steps: a primary dendritic crystal arm distance gamma 1 is obtained according a solid-liquid interface propelling speed V and a temperature gradient G in the steel continuous casting solidification process; the primary dendritic crystal arm distance gamma 1 is substituted into a mapping relation between an area Ai of a node i and the node i and a mapping relation between an area Aj of a node j and the node j; a separation mass of the MnS inclusion in a calculation domain is obtained according to two mapping relations and the mass conservation characteristic of solute elements Mn and S in the control unit volume in the calculation domain; and a radius value of the MnS inclusion is obtained according to the separation mass of the MnS inclusion. A quantifying relation between the size of the MnS inclusion in steel and dendritic crystal of solidified dendritic crystal structure of the continuous casting blank is built; and the size of the MnS inclusion in the steel can be quantitatively predicted according to the solidified structure of the continuous casting blank to provide new thoughts to control of the MnS inclusion in the continuous casting blank.

Size prediction method of MnS inclusion in steel continuous casting blank

The invention relates to the technical field of continuous casting production of steel, and particularly relates to a determination method of a single-roller pressing position of a bloom continuous casting solidification end. According to the determination method, the single-roller pressing position of the bloom continuous casting solidification end is determined by coupling the optimal pressing positions of all solute elements in the cast steel and the weight of the segregation degree of all of the solute elements. Thus, the optimal pressing positions of all of the solute elements in the steel are coupled with the segregation degree of all of the solute elements in the steel so as to determine the single-roller pressing position of the bloom continuous casting solidification end, targeted calculation can be made according to the steel with different components and contents, the determination according to an onsite process experiment is not needed, and a calculation result is accurate.

Determination method of single-roller pressing position of bloom continuous casting solidification end

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