223 results about "Directional solidification" patented technology

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 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 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 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.

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 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 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.

The application provides a method for regulating microstructure of hot-dip galvanizing zinc-aluminum-magnesium alloy through directional solidification technology, and belongs to the technical field of hot-dip plating. The technical problem solved by the application is that, in the actual production process, the accurate control of the cooling process cannot be realized, which leads to serious deficiencies in the accurate regulation of the solidification behavior and the alloy structure of the zinc-aluminum-magnesium coating. The technical scheme adopted by the application is that the coating surface temperature in each cooling process in the actual production process is measured, and the corresponding simulation results are combined to obtain the coating cooling parameters in the actual production process, and on this basis, the directional solidification test parameters are designed, so that the regulation of the microstructure of the hot-dip galvanizing zinc-aluminum-magnesium alloy through the directional solidification technology is realized. The method provided by the application can regulate the phase composition and the area fraction of the eutectic structure of the hot-dip galvanizing zinc-aluminum-magnesium alloy under different cooling processes through the directional solidification technology, so as to provide important theoretical guidance for improving the hot-dip galvanizing zinc-aluminum-magnesium process in the actual production process.

The invention discloses a eutectic high-entropy alloy with high strength and high toughness and a preparation method of the eutectic high-entropy alloy through a directional solidification process. The method comprises the steps that firstly, aluminum, cobalt, iron and nickel are smelted, then cast ingots are poured and homogenized, alloy raw materials are obtained, then the raw materials are machined into block cast ingots, the block cast ingots are placed in a crucible copper pipe, a top heat preservation cover, a graphite felt and a boron nitride heat insulation layer are additionally arranged one by one, and under the high-vacuum condition, the cast ingots are subjected to heat preservation and heat preservation. And carrying out low-temperature heating and high-temperature melt stirring treatment, carrying out drawing treatment after heat preservation, and gradually cooling the crucible and the melt until the crucible and the melt are completely solidified. According to the Al19Fe20Co20Ni41 high-entropy alloy and the preparation method thereof, the space proportion of a buffer dendritic crystal area and a eutectic area in the Al19Fe20Co20Ni41 alloy is regulated and controlled through different drawing rates, and a high-density coherent Ni3Al nano precipitated phase is introduced into an FCC matrix, so that the comprehensive mechanical performance of the Al19Fe20Co20Ni41 high-entropy alloy under the as-cast condition is remarkably optimized.

The directional solidification runner brick comprises a three-way runner brick body (1) and a horizontal runner brick body (2) which are matched with each other, the three-way runner brick body (1) comprises a horizontal section (11) and a vertical section (12), the interior of a hole channel (12a) of the vertical section (12) is in a horn shape, and the inner diameter of the hole channel (12a) is gradually reduced from the end close to the horizontal section (11) to the end away from the horizontal section (11); the horizontal section (11) is connected with the horizontal runner brick (2), and the inner diameter of the horizontal runner brick (2) is reduced from 80mm to 55mm. The device has the advantages of effectively stabilizing the liquid level height of the bottom pouring tank, reducing slag entrapment of the middle pouring tank and improving the internal quality of cast ingots.

The invention discloses a directional solidification high-boron high-speed steel jet nozzle for oil field hydraulic power and a preparation method thereof, and belongs to the technical field of oil field exploitation equipment. The preparation method comprises the steps that raw materials such as electrical pure iron and micro-carbon ferrochrome are proportioned according to the specific mass fraction, and high-boron high-speed steel molten steel is obtained through vacuum melting; after the molten steel is subjected to rare earth aluminum desulfurization and temperature control, an as-cast blank is obtained through directional solidification treatment; and the cast blank is subjected to machining, austenitizing quenching, tempering heat treatment and fine polishing treatment, and a finished product is obtained. The finished product comprises a metal matrix and a directionally-arranged (Fe, Cr) 2B boride hard phase, alloy components are accurate and controllable, the hardness is 58.5-64.5 HRC, and the surface roughness is 0.25-0.40 mu m. The high-wear-resistance and high-brittleness high-wear-resistance and high-performance alloy nozzle has low cost and high performance, the problems that a traditional nozzle is poor in wear resistance, high in cost and large in brittleness are solved, the service life is remarkably prolonged, and the high-wear-resistance and high-brittleness high-wear-resistance and high-brittleness high-wear-resistance high-brittleness high-wear-resistance high-brittleness high-wear-resistance high-brittleness high-

This invention relates to a self-water-cooled casting mold apparatus and method. The apparatus includes an inner shell and an outer shell. The upper end of the inner shell is open, and a first cavity is formed within the inner shell. A plurality of through holes are formed on the sidewalls of the inner shell, and these through holes are filled with water-soluble molding sand. The first cavity is used for casting. The outer shell is fitted over the inner shell, forming a second cavity between the two. A connecting rib connects the first and second cavities. The second cavity is used to contain a cooling medium. By controlling the cooling liquid level in the second cavity during the casting process, indirect and direct cooling of the casting is controlled, achieving directional solidification of the casting and improving the cooling efficiency.

The invention relates to an h-BN composite surface layer coating for a titanium alloy casting and a preparation method of the h-BN composite surface layer coating, in particular to the technical field of investment precision casting surface layer coatings. The h-BN composite surface coating for the titanium alloy casting comprises the following components in percentage by mass: 50%-70% of refractory aggregate, 20%-35% of a reinforced shell material, 5%-15% of a key additive and the balance of a binder. The mold filling capacity of the thin wall is remarkably improved. By adding the h-BN material treated by the silane coupling agent, the surface tension of titanium liquid is effectively reduced, the wettability of the front edge of molten metal is improved, and the mold filling integrity of a thin-wall area is improved from 75%-85% to 95% or above. The surface quality of the casting is improved, the h-BN material has the good heat conduction characteristic, directional solidification is promoted, surface grains are refined, meanwhile, the lamellar structure of the h-BN material is beneficial for forming a smooth shell surface, the surface roughness of the casting is reduced, the interface reaction is effectively restrained, and gradient control over the shell performance is achieved. The h-BN content is adjusted according to the areas with different wall thicknesses, and the problem that the thick-wall areas crack due to the chilling effect is solved.

A dual-walled component of a gas turbine engine includes a cold section part, such as a spar, and a hot section part, such as a coversheet. The cold section part includes a single crystal or directionally solidified metal alloy and defines an outer surface, a hot section part comprising a polycrystalline metal alloy formed using additive manufacturing. The hot section part includes a plurality of support structures forming a plurality of cooling channels and defining an inner surface. The outer surface of the cold section part and the inner surface of the plurality of support structures are diffusion bonded.

The invention discloses a method for manufacturing a molybdenum-rhenium alloy single crystal bar through an electric arc fuse additive. The method comprises the following steps that firstly, molybdenum powder and rhenium powder are mixed; 2, cold isostatic pressing; 3, sintering; 4, rotary swaging and wiredrawing; 5, alkali washing and ethanol cleaning; 6, the clean molybdenum-rhenium alloy wire is put into an electric arc fuse wire additive manufacturing molybdenum-rhenium alloy single crystal device; 7, fixing molybdenum-rhenium alloy single crystal seed crystals; 8, introducing cooling water; and ninthly, argon is introduced for gas washing, electric arc fuse wire additive manufacturing is conducted, and the molybdenum-rhenium alloy single crystal bar is obtained. The molybdenum powder and the rhenium powder are prepared into the molybdenum-rhenium alloy wire, then the molybdenum-rhenium alloy single crystal device is matched with the molybdenum-rhenium alloy single crystal seed crystals and the electric arc fuse wire additive manufacturing, electric arc fuse wire additive manufacturing is carried out, oriented surface growth of the molybdenum-rhenium alloy single crystal rod is achieved, preparation of the molybdenum-rhenium alloy single crystal rod is achieved, and the production efficiency of the molybdenum-rhenium alloy single crystal rod is improved. The method is suitable for preparing the molybdenum-rhenium alloy single crystal bar in the technical field of directional solidification of refractory alloy, the raw material utilization rate is increased, and the cost is reduced.

The invention relates to the field of railway vehicle part manufacturing, discloses a railway wagon swing bolster casting method based on directional solidification, and aims to solve the problems of low feeding efficiency and easy generation of shrinkage cavities and cracks caused by special wall thickness distribution of European type swing bolsters. The scheme is characterized in that a casting mold is poured in the posture that a center plate face faces downwards and a bottom face A area faces upwards; a built-in feeding bag of which the modulus is 1.15-1.25 times that of the center plate is arranged in the center of the center plate; easily-cut insulated risers are arranged at the discrete hot spots, and partition chillers are embedded between the adjacent risers to physically isolate the thermal field. And a stepped bottom pouring system comprising a sawtooth sand collecting bag and an ingate riser is adopted for mold filling. According to the technical scheme, directional solidification and partitioned precise feeding can be achieved, shrinkage cavities and shrinkage porosity caused by thermal field interference are eliminated, the yield is increased to 75% or above, and the reliability of castings is remarkably improved.

The invention discloses a device and method for directionally solidifying a super-large-section steel ingot through an electroslag furnace, and relates to the technical field of steel ingot machining. The device comprises a base, two furnace body rails are fixedly connected to the upper portion of the base, a movable furnace body assembly is arranged above the two furnace body rails, a supporting frame is fixedly connected to the left side of the upper portion of the base, and a transformer is fixedly installed above the supporting frame; a groove is formed in the middle of the base, a crystallization assembly is arranged in the groove through a positioning column, a slag ladle pushing hydraulic cylinder is installed on the right side of the upper surface of the base and located between the two furnace body rails, a moving trolley with a hole formed in the middle in a penetrating mode is arranged on the right side above the two furnace body rails, and a slagging assembly is installed above the moving trolley. The method has the advantages that through the process of'directional solidification + precise hot feeding ', slag layer waste heat and current gradient regulation and control are utilized, molten steel is promoted to fully fill a shrinkage space, the molten steel yield is increased, the loss of single-ton steel ingot finished products is reduced, and the production cost is greatly reduced.

The invention provides a preparation method of a copper-titanium alloy, which comprises the following steps: S1, mixing copper particles and TiH2 powder according to the composition proportion of the copper-titanium alloy, and forming the TiH2 powder on the surfaces of the copper particles to obtain composite copper particles; s2, the composite copper particles are placed in a crucible, and a directional solidification furnace is vacuumized and then filled with carbon-containing reducing gas; and S3, the crucible in the step S2 is heated so that the composite copper particles can reach the melting temperature, then the crucible is immersed into a cooling medium to be subjected to directional solidification cooling, and the copper-titanium alloy is obtained. The invention further provides the copper-titanium alloy prepared through the preparation method. According to the preparation method provided by the invention, TiH2 micro powder is uniformly adhered to the surfaces of copper particles in a mixing manner, and then directional solidification and cooling of the composite copper particles are carried out under micro-negative-pressure reducing gas; the copper-titanium alloy obtained by the process weakens the negative influence of titanium on the conductivity of copper, so that the copper-titanium alloy has the advantages of strength and conductivity.

The invention relates to the field of metal material magnesium alloys, in particular to a preparation method of a high-plasticity magnesium alloy and a product thereof. The second phase of the grain boundary is controlled to be a quasi-crystal phase by regulating and controlling alloy components, and the preferred growth orientation surface of the magnesium alloy is regulated and controlled to be a conical surface through directional solidification, and the growth orientation is that grains are typical columnar crystals; the size and distribution of the second phase are adjusted by changing the growth speed, and segregation of the second phase in the crystal is reduced. And finally, the quasicrystal second phase is dispersed and distributed in the crystal by regulating and controlling the temperature and time of heat treatment. In this way, the high-plasticity magnesium alloy is successfully prepared, and the yield strength of the high-plasticity magnesium alloy ranges from 170 MPa to 200 MPa; the tensile strength is 180 to 212MPa, the plasticity reaches 31.0 to 42.2 percent, and the product of strength and elongation is 5580 to 8947MPa.%.

The invention discloses a preparation method of modified high-carbon ferrochrome, and belongs to the technical field of nano modification. The method comprises the following steps: ultrasonically dispersing Fe-Cr alloy powder, a nano carbon material, a nitrogen source precursor and nano ceramic particles in an alcohol solvent, heating and stirring, sintering, and etching with hydrofluoric acid to obtain core-shell particles; adding the core-shell particles into the high-carbon ferrochrome matrix for mechanical stirring, and then adding graphene powder for smelting to obtain a modified melt; the modified melt is poured and subjected to directional solidification, and a modified casting is obtained; the casting is immersed in a hexamethylenetetramine ethanol solution, and a surface wear-resistant layer is formed through pyrolysis treatment and laser remelting; and the casting is quenched and tempered, and the modified casting with the surface nanocrystalline structure is obtained. The comprehensive performance of the high-carbon ferro-chrome is remarkably improved through synergistic modification of nanometer heterogeneous nucleation, graphene enhancement and surface nanometer crystallization.

The invention relates to the technical field of alloy materials, in particular to a high-temperature-resistant nickel-oxide-based alloy material and a preparation method thereof.The high-temperature-resistant nickel-oxide-based alloy material comprises, by mass, 12.0%-18.0% of Cr, 8.0%-12.0% of Co, 4.5%-6.5% of W, 1.5%-2.5% of Mo, 5.5%-6.5% of Al, 0.1%-0.3% of Y + La, 1.5%-3.2% of Nb and the balance Ni and inevitable impurities, and the preparation method of the high-temperature-resistant nickel-oxide-based alloy material comprises the steps that molten alloy liquid is poured and cooled, and a cast ingot is obtained; carrying out directional solidification treatment on the cast ingot to obtain a directional solidification cast ingot; and the directionally solidified cast ingot is subjected to aging treatment, and the high-temperature-oxidation-resistant nickel-based alloy material is obtained. The high-temperature oxidation-resistant nickel-based alloy material is excellent in high-temperature mechanical property, stable in bearing under the high-temperature working condition, appropriate in ductility and good in plasticity, and the high-temperature service stability is remarkably improved.

This invention relates to the field of high-temperature alloy technology, specifically to a method for improving the microstructure stability of single-crystal high-temperature alloys by controlling the nitrogen (N) content. The content of refractory elements in single-crystal high-temperature alloys increases with increasing heat resistance, leading to decreased microstructure stability and increased precipitation of topologically close-packed (TCP) phases, resulting in decreased mechanical properties. Based on the influence of N on the TCP phase precipitation behavior in high-temperature alloys, this invention proposes a method to effectively improve the microstructure stability of single-crystal high-temperature alloys by controlling the N content. By adding a certain amount of CrN or AlN during directional solidification to ensure an N mass content of 15-30 ppm in the single-crystal alloy, the amount of TCP phase precipitates in the alloy microstructure is significantly reduced after long-term high-temperature heat exposure, and the microstructure stability of the single-crystal alloy is significantly improved. This invention employs a simple and feasible method to effectively improve the microstructure stability of single-crystal high-temperature alloys.

The invention discloses an accumulation preparation method of a large-size eutectic alloy, and belongs to the technical field of metal material preparation. The method comprises the following steps: firstly, preparing a small-size preform (phi (5-10mm) * (50-100mm)) with a regular eutectic structure by adopting a Bridgman directional solidification technology; then arranging 10-20 preforms in parallel, and carrying out multidirectional forging at 50-100 DEG C below the eutectic temperature (the forging ratio is (3-5): 1); then carrying out stepped diffusion heat treatment (at 800-1300 DEG C, heat preservation for 2-8 hours) in a vacuum environment; then the forged blank serves as a casting mold lining, and a same-component alloy melt is poured through vacuum induction melting (the cooling rate is 5-10 K / s); and finally, carrying out 5-10 times of accumulative casting (the magnification rate of each time is 1.5-2.0 times) to realize size amplification. The size of the prepared eutectic alloy is larger than or equal to phi 200 mm * 500 mm, the eutectic lamellar spacing is smaller than or equal to 1 micrometer, the room-temperature tensile strength is larger than or equal to 1000 MPa, the ductility is larger than or equal to 10%, the 800-DEG C high-temperature strength retention rate is larger than or equal to 60%, the alloy can bear 1000-DEG C room-temperature heat cycles for larger than or equal to 50 times, the alloy is suitable for the field of high-end equipment such as aero-engine blades and nuclear reactor structural parts, and the technical problem of large-size eutectic alloy preparation is solved.

The application discloses a kind of turbine blade grinding after fluorescent defect root control method and system, it is related to turbine blade technical field, the present application adopts computer full-process closed-loop control, first obtains tenon tooth solidification characteristic parameter, constructs directional solidification multi-physics field coupling model and is solved to obtain transient multi-physics field data set;Again, through paste zone width two-stage quantization calculation, the shrinkage high-risk interval in tenon tooth grinding allowance range is determined;Based on risk interval, the optimal incremental drawing time correction calculation is completed, and qualified directional solidification process parameters are generated and verified;Finally, control equipment executes process, and realizes process solidification or reverse iterative correction by acquisition detection data.The present application eliminates the aggregation of microscopic shrinkage from the solidification source, realizes defect root, precision prevention and control, and has strong stability, which can significantly reduce the reject rate of blade production.