334 results about "Directional solidification" patented technology

The invention relates to a purification device and a high-purity aluminum purification method using the purification device. The purification device comprises a smelting chamber shell, a smelting chamber inner cavity, a smelting container arranged at the bottom of the smelting chamber inner cavity, a magnetic field module and a directional solidification module, wherein the magnetic field module and the directional solidification module are arranged in the gap position between the smelting chamber shell and the smelting chamber inner cavity. The magnetic field module comprises a first magnetic field and a second magnetic field; the first magnetic field comprises a centrifugal magnetic field area arranged on the periphery of the side wall of an inner cavity of the smelting chamber. The second magnetic field comprises axial magnetic field areas symmetrically arranged between the top of the inner cavity of the smelting chamber and the bottom of the inner cavity of the smelting chamber; the directional solidification module comprises a cooling part arranged at the bottom of the smelting container and a heating part arranged along the peripheral side of the top of the smelting chamber shell; according to the purification device and the purification method using the purification device, the removal rate of heavy impurities is preferably as high as 85% or above, the removal rate of light impurities is preferably as high as 75% or above, and continuous production of 6N high-purity aluminum is achieved.

The invention provides a directional solidification preparation method of a degradable high-hardness zinc alloy material. The preparation method of the zinc alloy material comprises the machining processes of vacuum induction melting, vacuum directional solidification melting and the like, through the preparation method, growth of Zn + Mg2Zn11 trilobal eutectic and Zn + MgZn2 spiral eutectic is regulated and controlled, microscopic structures are arranged in the specific direction, fine and uniform structure morphology is formed, and the corrosion resistance and the mechanical property of the alloy are improved. The Zn-Mg series alloy prepared by the preparation method disclosed by the invention shows excellent microhardness (181.19 to 243.10 HV). Besides, the corrosion rate of the ideal degradable bone implant is within the range of 0.1 mm / y to 0.5 mm / y, and the corrosion rate of the degradable medical Zn-Mg alloy bone implant material is within the range of 0.0316 mm / y to 0.2280 mm / y, so that the requirement on the corrosion rate in the bone repair process is met; and after the Cu element is added on the basis of Zn-3% Mg, the microhardness of the Zn-3% Mg-Cu-Cu alloy material is improved to about 200HV, and the advantages in the aspect of mechanical support are improved.

The application relates to the technical field of metal casting, and discloses a directional solidification casting equipment for low-internal-stress aluminum alloy complex structures, which comprises a heat preservation furnace, a rotary casting assembly, an infiltration temperature control assembly and a forming die. The casting equipment is provided with the rotary casting assembly and the forming die on a rotary table, the rotary table rotates at different rotating speeds to provide controllable centrifugal force, metal liquid is infiltrated and cast on the forming die in the anti-gravity mode under the action of the centrifugal force, the infiltration speed and pressure can be adjusted by changing the centrifugal force, the limitation of workpiece size in negative pressure casting is broken, and the anti-gravity casting of complex structure workpieces is facilitated, the equipment can simultaneously synchronously cast multiple molds, each process parameter is convenient to uniformly control, the quality consistency is ensured, the problem that continuous carbon fiber reinforced aluminum matrix composite materials are difficult to mass produce is solved, and the production efficiency is improved.

The invention discloses a high-added-value silicon sludge recovery device and a method thereof. The high-added-value silicon sludge recovery device comprises a furnace body, the pretreated silicon sludge feeding system comprises a material collecting bin and a discharging pipe which is communicated with the furnace body and the material collecting bin; the smelting storage system comprises a straight-through type ceramic crucible; the electromagnetic heating system comprises a graphite heater and an induction coil sleeved outside the graphite heater; the silicon monoxide collecting system comprises a collecting barrel; the high-purity silicon drawing and collecting system comprises a graphite plug positioned at the bottom of the straight-through type ceramic crucible and a driving mechanism for driving the graphite plug to move up and down in the straight-through type ceramic crucible; and the vacuum system comprises a mechanical pump communicated with the hearth of the furnace body. According to the method, the pretreated silicon sludge is directly subjected to electromagnetic induction heating in the vacuum environment, silicon in the silicon sludge reacts with silicon oxide on the surface layer to prepare silicon monoxide, meanwhile, high-purity silicon is prepared through directional solidification of redundant silicon in the silicon sludge, and then high-added-value recovery of the silicon sludge is achieved.

The invention relates to the field of single-crystal high-temperature alloy directional solidification casting defect prediction, in particular to a single-crystal blade freckle defect prediction method based on a large-module casting technology, which comprises the following specific steps of: establishing a 1 / 8 model of a large-module casting system by using modeling software; thermophysical parameters of the single-crystal high-temperature alloy are calculated, and the heat exchange coefficient among the casting, the mold shell and the water cooling disc in the numerical simulation process is determined in combination with related literatures; carrying out directional solidification numerical simulation, analyzing the change of the morphology of the pasty area in the solidification process, and counting the inclination angle of the pasty area of each part of the casting; establishing a Rayleigh number prediction formula, and comparing and analyzing a freckle high inclination area of a simulation result and a freckle occurrence position of an experiment result; and improving a Rayleigh number prediction formula by combining the inclination angle of the pasty area and the transverse temperature gradient value to obtain a Rayleigh number prediction result with more accurate prediction. According to the method, the position and tendency of freckles possibly appearing on the casting are predicted in advance by means of numerical simulation, and the freckle defect is avoided.

The invention relates to an aluminum-nickel-cobalt permanent magnet, a preparation method thereof and a precision part. The preparation method of the aluminum-nickel-cobalt permanent magnet comprises the following steps that raw materials are provided according to the stoichiometric ratio of the aluminum-nickel-cobalt permanent magnet, the raw materials are sequentially subjected to smelting treatment and directional solidification casting, and a casting is prepared; the casting is sequentially subjected to homogenization heat treatment, magnetic field heat treatment and tempering aging treatment, and the aluminum-nickel-cobalt permanent magnet is prepared; wherein the homogenization heat treatment is performed at the temperature of 1200-1350 DEG C in a heat preservation manner; in the step of magnetic field heat treatment, the direction of a magnetic field and the crystal orientation of the casting are in the same direction, and the crystal orientation of the casting is crystal brim in an X-ray diffraction pattern of the casting; 100 gt; and orienting. According to the method, the aluminum-nickel-cobalt permanent magnet which is relatively regular in structure, high in component uniformity and high in performance stability is obtained.

The invention relates to the field of industrial silicon melt purification, and discloses an industrial silicon melt purification method based on directional solidification and composite adsorption, which comprises the following steps: S1, multi-stage directional solidification pre-enrichment: carrying out primary directional solidification treatment on an industrial silicon melt, and controlling the solidification rate to be 0.5-5mm / min and the temperature gradient parameter, most of metal impurities in the melt are pre-enriched in a specific area; s2, dynamic targeted adsorption: in or after the primary directional solidification process, an efficient composite adsorbent is dynamically and continuously added into an impurity-rich area of the melt or the whole melt in batches, and the composite adsorbent has selective adsorption capacity for different impurities; and S3, intelligent regulation and control: constructing a full-flow adaptive intelligent dynamic regulation and control system based on digital twinning and AI algorithms. Compared with the prior art, the method has the advantages that the impurities are efficiently and stably removed, the grain structure is accurately modified, and meanwhile, the green and low-carbon production target is achieved.

The invention belongs to the technical field of ceramic materials, and particularly relates to a composite ceramic material and a preparation method and application thereof. The eutectic ceramic is prepared by taking aluminum oxide and yttrium oxide stabilized tetragonal phase zirconium oxide powder as raw materials and adopting a laser suspension zone melting directional solidification method, the drawing speed of the laser suspension zone melting directional solidification is greater than or equal to 100 mu m / s, and the laser power is greater than or equal to 300W; the eutectic ceramic is sequentially subjected to crushing, smashing and wet screening, eutectic ceramic powder is obtained, and the particle size of the eutectic ceramic powder is 20-100 microns; mixing the eutectic ceramic powder, silicon carbide whiskers and a sintering aid to obtain mixed powder; the mixed powder is subjected to hot pressing sintering, the composite ceramic material is obtained, and the hot pressing sintering temperature is smaller than or equal to 1550 DEG C. The composite ceramic material obtained by the preparation method provided by the invention has both a large size and a fine structure and has a micro-nano eutectic structure, and the mechanical properties of the material are remarkably improved.

The invention discloses a single crystal blade directional solidification process real-time closed-loop optimization method and casting equipment, and the method comprises the steps: S1, constructing a multi-physical field numerical simulation model to simulate a simulation temperature field in a directional solidification process; s2, arranging a temperature sensor at a key part of the actually poured single crystal blade to obtain an actually measured temperature field; s3, inputting the simulated temperature field and the actually measured temperature field into an extended Kalman filter to update model parameters of the multi-physical field numerical simulation model; s4, extracting solidification process characteristic parameters from the corrected multi-physical field numerical simulation model, inputting the solidification process characteristic parameters into a pre-trained machine learning model, and predicting a mixed crystal tendency probability; s5, optimizing process parameters of directional solidification by adopting a self-adaptive genetic algorithm by taking miscellaneous crystal tendency probability minimization as a target function; and S6, the optimized technological parameter set is issued to an execution mechanism, the directional solidification process is controlled to achieve closed-loop adjustment, and the steps S2 to S6 are executed circularly.

This invention belongs to the field of curing and molding of short fiber composite materials, and discloses an apparatus and method for three-dimensional oriented curing and molding of short fibers. The orientation device of this invention includes a storage tank for holding the short fiber curing solution, a base for fixing the entire device, a horizontal rotation system for controlling the horizontal angle of the fibers, a vertical rotation system for controlling the vertical rotation angle of the fibers, and an electromagnetic system and a control system for providing an electromagnetic field. Under the command of the control system, the electromagnetic system generates an electromagnetic field, which is then used for magnetic field positioning under the drive of the horizontal and vertical rotation systems. The electromagnetic field then orients the magnetized short fibers. This apparatus and method can achieve three-dimensional orientation of short fibers in a matrix material, effectively improving the mechanical properties of short fiber reinforced composite materials and further enhancing the designability of short fiber composite materials.

The invention relates to the technical field of silicone rubber composite materials, in particular to a flame-retardant silicone rubber composite material and a preparation method thereof, and the flame-retardant silicone rubber composite material comprises a matrix polymer, a reinforcing filler, a compound flame-retardant system, a reinforced protection system, a crosslinking system and a processing aid. According to the material disclosed by the invention, synchronous breakthrough is realized on three core indexes of flame retardance, mechanical strength and durability, and the technical defects of a traditional silicon rubber material are overcome; the problems of non-uniform dispersion of a high-filling system, catalyst deactivation, interface layering and the like are fundamentally solved, the method is particularly suitable for the fields of power battery sealing, aerospace cables and the like which require an extreme flame retardant grade and need to maintain a flexible sealing function, and a scheme capable of realizing mass production is provided for a high-performance organic silicon material.

The invention discloses a preparation method of a corrosion-resistant and impact-resistant high manganese steel wear-resistant lining plate, and relates to the technical field of wear-resistant materials, the preparation method comprises the following steps: S1, weighing raw materials according to the mass percentage; s2, raw material smelting; s3, rare earth purification is conducted, specifically, rare earth elements are added into the molten-state raw materials, and the molten-state raw materials are subjected to deoxidation and desulfurization treatment; s4, casting molding is conducted, the temperature from the bottom end of a casting to a riser is controlled to be decreased stage by stage, and directional solidification is achieved; s5, heat treatment is conducted, specifically, the casting is subjected to solution treatment and then subjected to water quenching to the room temperature; and S6, surface treatment is conducted, specifically, shot blasting treatment is adopted, surface oxide skin is removed, and a surface compressive stress layer is formed. The strength, hardness and high toughness of the high-manganese steel are guaranteed by controlling the content of carbon and manganese, meanwhile, single-phase austenite is obtained through solution treatment, the hardness is improved through carbon atom segregation through low-temperature aging, and the strength, hardness, toughness and corrosion resistance of the high-manganese steel lining plate are improved.

A complete investment casting experiment is carried out around an autonomously designed turbine blade mold, S1, S2 and S3 section sizes of a casting in different stages are collected, and a time sequence data set is established, including mold, wax pattern, directional solidification, mold shell removal, pouring system removal and ceramic core constraint removal. Analysis shows that the average deviation of the casting size evolves continuously in different stages (from 0.2134 mm to 0.1857 mm), deviation accumulation is achieved, and the influence degrees of all the stages are different. In order to effectively capture the changes of the casting, an LSTM neural network is adopted to mine size deep features and establish a time-varying model. The result shows that the LSTM considers the deformation history by virtue of the unique door structure, the prediction value of the average deviation of the casting in a single-step prediction task is 0.1832 mm, and the test average absolute percentage error (MAPE) is 1.35%; the MAPE of the multi-step prediction is 2.99%, and the MAPE of the final step is 6.63%. The research provides a new thought for intelligent development of the field of investment casting.

The invention discloses a vacuum directional solidification furnace and relates to the field of alloy manufacturing, the vacuum directional solidification furnace comprises a smelting chamber, a casting cavity is formed in the inner side of the smelting chamber, a smelting crucible is rotatably mounted on the side end face of the casting cavity, and a lifting guide rail is welded to the end face of the side, adjacent to the smelting crucible, of the inner side of the smelting chamber; the lifting mechanism is installed on the inner side of the smelting chamber, the lifting mechanism can be prevented from influencing opening and closing of the flap valve by moving from top to bottom, the flap valve can be closed when the smelting crucible smelts metal materials, high-temperature tin steam in the cooling tin pot at the bottom cannot float into the smelting crucible, and the smelting efficiency is improved. And in addition, the internal vacuum state during smelting is beneficial to crystal formation, it is guaranteed that the formed high-strength alloy material cannot cause alloy cracks due to tin fusion, it is guaranteed that the alloy performance cannot be affected by tin while the alloy integrity is guaranteed, the alloy quality is improved, the yield is increased, and the influence of tin steam on top alloy melt is further reduced.

The invention belongs to the field of metal casting, and relates to a self-adaptive upward variable-speed drawing directional solidification device and method, and the device comprises a crystallizer, a cooler, a furnace chamber, a sealing cover, a heater, a crucible, an electric linear motion mechanism, a mold shell and a seed crystal; the sealing cover is detachably and hermetically connected to the top of the furnace chamber; the crucible is positioned in the furnace chamber; the heater penetrates through the outer wall of the furnace chamber and extends into the furnace chamber; the electric linear motion mechanism is arranged at the top of the sealing cover, the crystallizer vertically penetrates through the sealing cover and extends into the furnace chamber, the electric linear motion mechanism is connected with the top of the crystallizer, and the seed crystal is arranged at the bottom of the crystallizer; the mold shell is located under the seed crystal, cooling rings are wound around the top end outside the mold shell, the bottom end of the cooler is communicated with the two cooling rings, the cooler is parallel to the crystallizer and extends out of the furnace cavity from the top of the sealing cover, and the top end of the cooler is detachably connected with the electric linear motion mechanism. And the drawing speed of different stages can be controlled to control the bending degree of a solidification interface, and oblique crystals are controlled.

The invention discloses a method for constructing a periodic directional solidification structure based on modulated ultrasound, and relates to the technical field of metal material preparation. The method comprises the following steps: smelting a metal raw material to obtain a metal melt; the metal melt is subjected to directional solidification, and periodic modulation ultrasound is applied to the front edge of a liquid-solid interface of the metal melt in the directional solidification process; and after periodical modulation ultrasound is applied, a periodical directional solidification structure with the grain size controllable and columnar / equiaxed crystals alternately appearing is obtained. According to the method, the sound field characteristics at the front edge of the liquid-solid interface in the directional solidification process can be detected in real time, feedback adjustment is conducted, and it is guaranteed that multi-mode ultrasonic treatment is efficient, stable, accurate and controllable.

The invention relates to the field of metal materials, in particular to an Nb-Si-Ni-Ti series novel ultrahigh-temperature structural material and a rapid directional solidification preparation method thereof. The preparation method provided by the invention is a rapid directional solidification preparation method of an Nb4NiSi-reinforced Nb-Si-Ni-Ti series novel ultra-high-temperature structural material, the alloy is mainly composed of an Nb4NiSi phase and an Nb solid solution phase through component design, and a laser direct deposition method controlled by a temperature field is adopted to prepare the Nb4NiSi-Ni-Ti series ultra-high-temperature structural material. The microstructure of the Nb-Si-Ni-Ti series novel ultra-high-temperature structural material is formed by alternately and directionally arranging Nb4NiSi and Nb solid solutions. According to the alloy, the high-temperature strength of the alloy is provided by the Nb4NiSi ternary silicide, the room-temperature ductility and toughness of the alloy are provided by the Nb-based solid solution, and the alloy is arranged in a fine directional structure, has relatively excellent room-high-temperature mechanical property and can be applied to application scenes such as aero-engine turbine blades needing ultrahigh-temperature structural materials.

The invention relates to a directional solidification method for pure copper, which comprises the following steps of: preserving heat of an ingot mould at the temperature of 300-400 DEG C for 12-18 hours, and preheating the ingot mould; the electrolytic copper is melted into molten copper in the vacuum atmosphere; a first cooling water circulating pump is started, so that cooling water flows through a circulating flow channel in the cooling base, and the ingot mold on the cooling base is cooled; molten copper is poured into the ingot mold, heating coils are started, and the heating coils are arranged in multiple circles in the height direction of the ingot mold; and pouring is completed, specifically, the molten copper is subjected to standing in the ingot mold for 120-180 min, and a directionally-solidified copper ingot is obtained. One-way heat dissipation of the bottom of the ingot mold is forcibly achieved through a circulating runner on the cooling base, a stable temperature gradient is formed, and columnar crystal growth is promoted so as to optimize the mechanical property. A plurality of circles of heating coils and a plurality of circles of cooling water pipes are arranged on the ingot mold, the temperature of the ingot mold is dynamically adjusted, gradient distribution of the temperature of the ingot mold is achieved, and therefore directional sequential solidification is achieved.

The invention relates to the field of high-temperature alloy component design, in particular to a high-temperature alloy compensation design method based on interaction characteristics of an impurity element S and precious metal Ru. The single-crystal high-temperature alloy is prepared through directional solidification, the total content of refractory elements (Cr, W, Mo, Re, Ta, Hf and the like) of the high-temperature alloy exceeds 20 wt.%, the alloy does not contain rare precious metal Ru and the like, the high-temperature creep resistance of the alloy is improved through the solid solution strengthening and precipitation strengthening effects, the content of S in the alloy is smaller than 1 ppm, the TCP phase precipitation tendency is obviously reduced, and the number of TCP precipitated through thermal exposure is minimum. Based on the interaction characteristic of S and Ru, Ru capable of improving the alloy structure stability in the high-generation single-crystal high-temperature alloy is removed, the alloy is compensated and designed by controlling the content of S in the alloy to be smaller than 1 ppm, so that the structure stability of the single-crystal high-temperature alloy is improved, and a guiding thought can be provided for component design of the low-cost high-generation single-crystal high-temperature alloy.

The application provides a preparation method of a Si-based multi-component alloy bonding layer in an environmental barrier coating, and steps are as follows: S1, substrate preparation: taking SiC fiber reinforced SiC composite material as a substrate; S2, preparation of the Si-based multi-component alloy bonding layer: S21, the preparation process is carried out in a directional solidification crystal growth furnace, the furnace comprises a quartz glass tube, a graphite crucible and a heating device; S22, adding silicon material and X metal material into the graphite crucible; S23, fixing the substrate above the graphite crucible; S24, vacuumizing the quartz glass tube; S25, introducing cooling water, turning on the power supply, heating the graphite crucible through the heating device, until the silicon material and the X metal material in the graphite crucible are completely melted into Si-based alloy melt with fluidity; S26, immersing the pre-grown coating composite material substrate into the melt, and then gradually separating the substrate from the Si-based alloy melt through slow downward pulling of the graphite crucible, growing the Si-based alloy on the surface of the composite material uniformly, and preparing the Si-based multi-component alloy bonding layer.

The invention discloses a high-temperature alloy turbine blade directional solidification method based on multistage dynamic gas protection control. The high-temperature alloy turbine blade directional solidification method comprises the following steps that a high-temperature alloy mother alloy material is put into a crucible; filling inert gas to a preset pressure, heating the crucible, heating to a preset temperature, and keeping the temperature to ensure that the alloy liquid is liquefied; continuously filling inert gas to preset pressure and then refining, wherein a vibration generator generates a magnetic field in the refining process to carry out electromagnetic vibration on the alloy liquid; continuously filling inert gas to preset pressure, and then transferring the crucible; inert gas is continuously filled to preset pressure, then the crucible is tilted, pouring is conducted, and in the pouring process, a gas purging device sprays the inert gas to conduct purging protection on the alloy liquid; and continuously filling inert gas to preset pressure, and pulling the shell to finish the directional solidification process. The method can reduce the gas content in the melt, prevent the melt from being oxidized, promote the removal of a surface oxidation film, reduce pores and oxidation film inclusion, and improve the purity, mechanical properties and yield of the casting.

The application discloses a kind of homogenizing casting device based on turbulent melt in-situ reaction and its use method.It includes: vacuum cavity, two reactors, feeder, revolution centrifuge and vacuum pump, two the reactor, feeder, revolution centrifuge are placed in the vacuum cavity, the vacuum pump is extracted vacuum to the vacuum cavity;By the use of gas / liquid / solid feeder, high-temperature melt can be fully in-situ reaction, reaction product size uniformity is good, in-situ generation composite phase or in-situ realization adds the interface modification of composite phase;The introduction of periodic vibration, with revolution and rotation produces synergistic effect, realizes the crushing of melt in agglomerate, produces more sufficient homogenization effect;Combining fast directional solidification locks the uniform state of melt, realizes degassing by vacuum extraction, by periodic vibration can also avoid sticking wall and help ingot overall demoulding, finally obtain homogeneous ingot.In addition, the device casting speed is fast, and casting efficiency is high.

This invention relates to a method for preparing ultra-pure smelting of high-strength and high-toughness special steel at ultra-low temperatures. The chemical composition (wt%) is controlled as follows: C≤0.01%, Si≤0.05%, Mn≤0.05%, S≤0.005%, P≤0.005%, Ni: 17.5~18.5%, Co: 8.0~9.0%, Mo: 3.0~3.8%, Al: 0.05~0.15%, Ti: 0.20~0.35%, H≤1.0 ppm, O≤16 ppm, N≤15 ppm, with the balance being Fe and other unavoidable impurities. Core Technology: A five-element synthetic slag system of CaO-SiO2-Al2O3-MgO-CaF2 is introduced during the VIM stage. Utilizing the high-speed directional solidification effect of VAR steady-state remelting, and through matching the smelting environment and cooling rate, the coarse, brittle titanium sulfide phase is transformed into finely dispersed Al-Mg-Ti-S-O multiphase composite oxides. This achieves composite modification of inclusions and reduces their number density from 45 inclusions / mm². 2 Reduced to 8.5 pieces / mm 2 It effectively eliminates the hazards of large particles >4μm. The average grain diameter of the original austenite is refined from 42.37μm to 26.38μm, the elongation of the material reaches 21.06%, and the impact energy is as high as 143.63J, significantly improving the resistance to brittle fracture and possessing extremely high engineering application value.

The present invention provides a method for controlling the defects of impure crystals in a sudden cross section of a single crystal high-temperature alloy casting with secondary orientation, and relates to the technical field of preparation of single crystal high-temperature alloy castings. The present invention can effectively shorten the time for the dendrite branches of the blade to grow to the corners of the sudden cross section by controlling the growth direction of the secondary dendrite orientation relative to the sudden cross section based on the position, shape and placement of the sudden cross section of the single crystal high-temperature alloy casting where impure crystals are likely to appear, thereby effectively suppressing the impure crystals generated by supercooled nucleation at the corners of the sudden cross section of the blade. Compared with the prior art, the process of the present invention is simple and easy to implement, does not require the addition of new equipment or the modification of the original directional solidification equipment, does not introduce other solidification defects, does not affect subsequent heat treatment, and can greatly improve the yield of single crystal high-temperature alloy castings.

The application provides a high-throughput high-entropy alloy component design method, comprising the following steps: S1) preparing an initial sample of pure metal or alloy; S2) preparing a master alloy ingot according to the high-entropy alloy component; S3) assembling the initial sample at the bottom of a mold shell, fixing the mold shell on a directional solidification furnace pulling device, and exposing a part of the initial sample from the liquid level of a cooling tank, and immersing the remaining part into the cooling liquid in the cooling tank; S4) assembling the master alloy ingot on the upper part of an induction dripping system of the directional solidification furnace, and turning on the heating power supply of the directional solidification furnace; S5) turning on the induction dripping system until the master alloy ingot is melted and dripped into the mold shell, and then cooling and solidifying after heat preservation. The high-throughput sample component prepared by the method provided in the application is uniform and linear, and the component screening precision is higher; the high-throughput sample with single-element or multi-element coupling change can be efficiently prepared, the performance data reliability is higher, and the industrial application potential of the alloy is greater.

The invention provides a high-strength corrosion-resistant iron-chromium-aluminum alloy and a preparation method thereof, and relates to the technical field of iron-chromium-aluminum alloys, the high-strength corrosion-resistant iron-chromium-aluminum alloy comprises, by mass, 19-25% of Cr, 8.5-11% of Al, 0.3-0.8% of Nb, 0.1-0.4% of Ti, 0.2-0.6% of Si and the balance Fe and limited impurities, a dispersion strengthening phase is formed by compositely adding Nb and Ti, and the oxidation resistance is improved by synergistically optimizing the proportion of Cr and Al; the preparation method comprises the steps of raw material pretreatment, vacuum melting and refining, directional solidification, homogenizing annealing, hot working and solid solution-aging heat treatment, and process parameters are accurate and controllable. By optimizing the proportion of Cr and Al and compositely adding Nb and Ti, the pain point that strength and corrosion resistance are difficult to cooperate is solved; and meanwhile, homogenizing annealing, directional solidification optimization and heat treatment parameters are added in the process, segregation and internal stress are eliminated, the performance of the prepared iron-chromium-aluminum alloy comprehensively exceeds that of a conventional iron-chromium-aluminum alloy, and the prepared iron-chromium-aluminum alloy is adaptive to high-end scenes and high in stability.

The invention discloses an alloy directional solidification dendritic crystal front pore capture behavior prediction method comprising the following steps: obtaining data, and obtaining a CA-FD-LB coupling model; updating the distribution state of fluid particles in the grid in real time, and marking or updating the gas phase according to the distribution state of the particles in the grid; the temperature gradient and the cooling speed are initialized, and meanwhile the temperature of the whole calculation area changes along with time; obtaining a liquid phase equilibrium component at a solid / liquid interface and a solid phase fraction increment of a solid / liquid grid in a time step, marking solid phase distribution in a calculation area, and calculating a concentration field and solute redistribution; calculating the fluid-solid interaction between the bubbles and the solid phase; judging whether a calculation ending condition is met or not, if yes, ending calculation, and performing data visualization processing; otherwise, returning to the step 2, and starting calculation of the next time step. According to the method, the microscopic structure evolution process can be observed in real time while the calculation efficiency is high, and information is quantified.

The invention relates to the technical field of iron-gallium-based magnetostrictive materials, in particular to a boron-doped iron-gallium alloy magnetostrictive material and a preparation method thereof. The boron-doped iron-gallium alloy magnetostrictive material is obtained by taking a Fe83Ga17 alloy as a matrix, doping B into the matrix and carrying out directional solidification treatment so as to enable crystal grains to grow along a [100] direction, thereby obtaining the boron-doped iron-gallium alloy magnetostrictive material, the chemical expression of the boron-doped iron gallium alloy magnetostrictive material is Fe < 83 > Ga < 17 > B < x >, wherein 1 < = x < = 4. The Fe83Ga17 alloy is used as a matrix, and the growth of crystal grains in the [100] direction is adjusted by controlling the amount of additionally doped B, so that the magnetostriction property and the mechanical property of the magnetostriction material are improved.

The application discloses a kind of second generation nickel-based single crystal superalloy recrystallization defect simulation and control method.The method steps are: according to sample preparation wax mold, after sand blasting, dry baking, manufacture ceramic shell;Through directional solidification preparation second generation nickel-based single crystal superalloy sample, control pulling speed, holding temperature and temperature gradient and other parameters;According to service condition preparation sample, simulate stress loading, in combination with heat treatment simulate actual service environment;Using electron backscattering diffraction and X-CT imaging, characterize recrystallization grain orientation distribution, three-dimensional morphology, content and thickness.Process parameter-defect characteristic mapping relationship is established, the stress distribution characteristics during preparation are clarified, the ceramic shell and preparation process are feedback controlled, and the control of recrystallization defects is realized.The application simulates the actual service environment of high-temperature alloy blade, and restores the performance of recrystallization defect sample in actual service environment.The application provides an experimental reproduction method and effective process control strategy for recrystallization defect research.

The application relates to the technical field of refractory metal material processing, in particular to a vacuum smelting system and method for high-purity molybdenum and a fiber-structure molybdenum material, the vacuum smelting system for high-purity molybdenum comprises a three-layer composite crucible, the vacuum smelting method for high-purity molybdenum comprises the following steps: step S1): under the condition of a vacuum degree of less than or equal to 5*10 ‑3 Pa, a three-layer composite crucible is used to perform consumable smelting on molybdenum raw materials; step S2): a directional solidification rate is controlled to be 8-12 mm / min, and a longitudinal temperature gradient is formed to be greater than or equal to 100 DEG C / cm; step S3): multi-stage plastic deformation is implemented on a solidified ingot, and a total deformation amount is greater than or equal to 90%; the fiber-structure molybdenum material is formed with a longitudinal continuous fiber structure in the material, a grain length-diameter ratio is greater than or equal to 10:1, a fiber diameter is less than or equal to 5 microns, hydrogen content is less than or equal to 5 ppm, oxygen content is less than or equal to 50 ppm, and a room-temperature tensile strength is greater than or equal to 780 MPa; the application can prepare high-purity fiber-structure molybdenum material, and improves the problem of insufficient axial performance caused by the isotropy of a traditional equiaxed crystal structure.