2164 results about "Superalloy" patented technology

The invention relates to the technical field of intelligent control, and discloses a self-adaptive temperature curve control system for high-temperature alloy vacuum casting, which comprises a sensing module, a control module and a control module, and is characterized in that the sensing module acquires multi-point temperature information and preprocesses the information to obtain temperature distribution in a furnace; the acquisition module obtains vacuum environment parameters. The simulation module establishes a three-dimensional dynamic coupling model based on heat conduction, radiation, convection and phase change heat effect, and obtains a real-time temperature evolution prediction result. The generation module obtains a target temperature curve of the corresponding stage. The prediction control module collects a real-time temperature evolution prediction result and a target temperature curve, deviation calculation and trend analysis are carried out, and a heating power and cooling flow control instruction is generated. And collecting product feedback errors and carrying out self-learning correction on prediction model parameters to obtain an optimized control output result. The control and optimization of the high-temperature alloy vacuum casting temperature field are realized, and the structure uniformity of castings and the quality stability of finished products are improved.

The invention relates to the technical field of machine tool control, in particular to an electrolysis arc milling composite numerical control machine tool control method and system for case machining. The method comprises the steps that firstly, an electrolyte supply system, an electric arc generation system, a high-pressure water jet system and an ultrasonic vibration system are started in sequence, operation data are obtained, and rough machining parameters are calculated; in the rough machining process, the machining gap, the discharging state and the temperature are monitored in real time and compared with standard parameters, and correction values are calculated; after rough machining is completed and the electrolytic arc milling device is detached, the feeding speed and the spindle rotating speed are adjusted according to the correction value, and finish machining parameters are obtained; by electrolyzing electric arc corrosion materials and combining the synergistic effect of high-pressure water jet and ultrasonic vibration, efficient removal and accurate control of super-difficult-to-machine materials such as titanium alloy and high-temperature-resistant alloy in the machining process are achieved, and the machining efficiency and quality are improved.

The invention relates to a crack repairing method for an additive manufacturing nickel-based high-temperature alloy part, and relates to the technical field of high-temperature alloys. According to the main technical scheme, filler powder and solder powder are adopted for conducting crack repairing on the additive manufacturing nickel-based high-temperature alloy part; wherein the solder powder comprises the following chemical components in percentage by weight: 11.0 to 17.0 weight percent of Cr, 5.0 to 9.0 weight percent of W, 1 to 4 weight percent of B, less than or equal to 0.06 weight percent of C, less than or equal to 0.1 weight percent of Co and the balance of Ni; wherein the filler comprises the following chemical components in percentage by weight: 6 to 10 weight percent of Cr, 6 to 10 weight percent of Co, 6 to 10 weight percent of W, 0.5 to 3 weight percent of Mo, 3 to 6 weight percent of Al, 0.5 to 2 weight percent of Ti, 3 to 6 weight percent of Ta, less than or equal to 0.2 weight percent of C, less than or equal to 0.1 weight percent of B, less than or equal to 2 weight percent of Hf and the balance of Ni; the additive manufacturing nickel-based superalloy comprises the following chemical components in percentage by weight: 6 to 10 percent of Cr, 6 to 10 percent of Co, 6 to 10 percent of W, 0.5 to 3 percent of Mo, 3 to 6 percent of Al, 0.5 to 2 percent of Ti, 3 to 6 percent of Ta, less than or equal to 0.2 percent of C, less than or equal to 0.1 percent of B, less than or equal to 2 percent of Hf and the balance of Ni. The method is mainly used for solving the problem of repairing and remanufacturing the cracks of the additive manufacturing nickel-based superalloy part, and has important application value.

The invention relates to the technical field of intelligent detection, and discloses a high-temperature alloy casting size on-line detection system based on machine vision, and the system comprises an imaging fusion module which collects image data of a high-temperature alloy casting, carries out the pixel-level registration of infrared image data and visible light image data, and generates a multispectral fusion image. The feature extraction module performs temperature distribution analysis and brightness feature extraction based on the multispectral fusion image, generates an edge confidence map and extracts a feature point set. And the calculation module performs weighted fitting on the feature points according to the feature point set to obtain thermal state size parameters. And the thermal compensation module performs thermal compensation and geometric correction on the thermal-state size parameters to obtain cold-state size parameters. And the judgment module carries out comparison to judge whether the casting is a qualified casting. According to the invention, stable imaging and accurate registration in high-temperature radiation and strong reflection environments are realized, and the detection efficiency and the size control level of the high-temperature alloy casting are improved.

The invention provides a novel model and a novel method for component design of a high-flux nickel-based superalloy for additive manufacturing based on multi-objective optimization and a novel alloy, and relates to the technical field of component design of nickel-based superalloy and additive manufacturing. The invention aims to design a novel K438 alloy with excellent mechanical properties at 850 DEG C by taking the K438 alloy as an example, and the novel K438 alloy has lower crack sensitivity. The method is mainly characterized in that the influence of solidification cracks, liquefaction cracks and solid cracks is comprehensively considered, and a comprehensive crack sensitivity (CCS) model is established; the CCS values and the yield strength of 850 DEG C of tens of thousands of alloys are obtained through high-flux thermodynamics calculation by combining a CCS model and a high-temperature yield strength model, and the Pareto alloy is automatically optimized by utilizing a self-written Python script. According to the method, a data basis can be provided for design and production of the nickel-based high-temperature alloy for additive manufacturing, and a new theoretical basis and method are provided for development of the high-strength printable nickel-based high-temperature alloy.

The present application belongs to the technical field of superalloys. Disclosed is a preparation method for a nickel-based superalloy. The present application solves the problem of a nickel-based superalloy in the prior art making it difficult to satisfy the comprehensive requirements of a component for both a long alloy endurance life and a low crack propagation rate. The preparation method comprises: step 1: performing smelting, so as to obtain a cast ingot; step 2: subjecting the cast ingot to a homogenizing heat treatment, wherein the homogenizing heat treatment comprises two sections of heat preservation; and after the second-section heat preservation, performing furnace cooling to 1000+ / -10°C or below, and then performing discharging and air cooling; step 3: preparing a bar blank and a forging piece by means of forging; step 4: performing a solution treatment; and step 5: performing a stabilization and aging treatment, so as to obtain a nickel-based superalloy. The nickel-based superalloy prepared by means of the method of the present application has a high strength, good low-cycle fatigue performance, a low crack propagation rate and excellent comprehensive performance.

The invention discloses a method and device for predicting the fatigue life of a high-temperature alloy vacuum electron beam welding structure, and belongs to the technical field of aero-engines. The method comprises the following steps: acquiring fatigue experiment data of a target high-temperature alloy standard sample; extracting the maximum area of an initial defect, a defect shape factor and crack source position information; obtaining a stress intensity factor range considering defect morphological characteristics and a fatigue crack propagation threshold value of a material structure containing initial defects, and correcting a damage tolerance theoretical formula to obtain simulation data; fatigue test data and simulation data are fused to form an initial data set, a fatigue limit is calculated and expanded to the data set, the expanded data set serves as input, training is conducted through a support vector regression method, hyper-parameters are determined through Bayesian optimization, and a fatigue life prediction result of the high-temperature alloy vacuum electron beam welding structure is output. The method provided by the invention can well consider the influence of different morphology defects on the fatigue performance of the welded joint.

The invention relates to a data-driven deformation nickel-based superalloy multi-objective performance reverse design optimization method, which belongs to the technical field of metal material design and development, and comprises the following steps: calculating a stable high-strength deformation nickel-based superalloy system based on a first principle, and on this basis, calculating a deformation nickel-based superalloy system; constructing a deformed nickel-based superalloy component design space based on the knowledge of the nickel-based superalloy field; based on a deformed nickel-based superalloy component design space, the deformed nickel-based superalloy component design space is reduced by adopting an empirical formula in combination with thermodynamic high-throughput calculation to obtain the reduced deformed nickel-based superalloy component design space, and based on the reduced deformed nickel-based superalloy component design space, based on machine learning and a genetic algorithm, the deformation nickel-based superalloy component design space is obtained. And a deformed nickel-based high-temperature alloy reverse design model is established, and the deformed nickel-based high-temperature alloy with the target performance is screened. Compared with the prior art, the oriented development method for the high-strength and high-toughness nickel-based high-temperature alloy is achieved by fusing cross-scale calculation, domain knowledge constraint and machine learning reverse design.

The invention discloses a precise etching method for a nickel-based high-temperature alloy core plate micro-channel, and belongs to the field of metal chemical etching. According to the method, the mask pattern is optimized, the formulas of the etching liquid and the anti-lateral etching liquid are accurately designed, key parameters such as the etching temperature, the etching time and the spraying pressure are strictly controlled, the anti-lateral etching liquid is designed to form the protective film layer on the side wall of the groove, the lateral etching phenomenon is inhibited by combining the process of alternately spraying the etching liquid and the anti-lateral etching liquid, the etching efficiency and stability are improved, and the etching quality is improved. And meanwhile, the surface quality is optimized, high-precision etching processing of the nickel-based high-temperature alloy core plate micro-channel is realized, and the lateral erosion phenomenon caused by isotropy of wet etching is inhibited.

The invention provides an ultrasonic nonlinear static parameter monitoring method for creep damage of a high-temperature alloy component, and particularly relates to the technical field of material monitoring. The method comprises the following steps: S1, arranging an ultrasonic probe; s2, determining the emission frequency of the excitation end; s3, respectively calculating an incident angle and an emergent angle of the signal; s4, exciting fundamental frequency ultrasonic waves; s5, receiving the signal and uploading the collected signal to a cloud processing system; s6, carrying out fast Fourier transform and calculating a nonlinear parameter of a static component; s7, establishing a linear relation with creep time, and constructing a creep damage linear quantitative model; s8, calculating a static component nonlinear parameter of the healthy sample; and S9, completing quantitative analysis of the damage by using nonlinear parameters. The method solves the problems that a traditional nonlinear ultrasonic method depends on second harmonic nonlinear parameters, phase velocity matching conditions in the middle and later periods are seriously damaged, response shows a nonlinear trend, unique creep time cannot be determined according to the parameters, and then the unique damage state cannot be determined.

The invention discloses a high-strength high-temperature alloy and a preparation method thereof. The high-strength high-temperature alloy comprises a high-temperature alloy matrix and rare earth oxides dispersed and distributed in the high-temperature alloy matrix. The high-temperature alloy matrix is GH4169, and the high-temperature alloy matrix is made of The rare earth oxide is one or two of La2O3 and Ce2O3, the particle size of the rare earth oxide is 50-500nm, and the total adding amount of the rare earth oxide is 0.02-0.03% of the mass of the alloy; the preparation method of the high-strength high-temperature alloy comprises the following steps: (1) preparing rare earth oxide particles; (2) charging and smelting rare earth oxide particles and alloy raw materials in a vacuum induction furnace, and casting into ingots after the components are qualified; (3) electroslag remelting: adding analytically pure rare earth oxide into a slag system; and (4) the electroslag ingot is subjected to homogenization, forging and solid solution aging treatment, and then the alloy is obtained. According to the method, the strength and plasticity of the high-temperature alloy are improved.

The invention relates to the technical field of additive manufacturing, and discloses an additive manufacturing hot-crack-free precipitation strengthening high-temperature alloy and a preparation method thereof.The method comprises the steps that a laying layer is divided into a plurality of parallel scanning strips according to the preset translation direction and the scanning strip interval, strip type scanning is conducted in a laser autorotation and translation motion coupling mode, and the high-temperature alloy is obtained; molten pool disturbance is remarkably enhanced, periodic shear fracture of the tip of dendritic crystal is achieved, epitaxial growth of columnar crystal is broken, grain equiaxalization is achieved, and anisotropy is weakened; in addition, laser scanning is a high-speed scanning strategy with the translation speed larger than or equal to 1500 mm / s, a shallow molten pool is formed through regulation and control of the high scanning speed, surface tension in the shallow molten pool is utilized, convection in the molten pool is enhanced, dendritic crystals are refined, columnar crystals in the high-temperature alloy are further reduced, and anisotropy of mechanical properties is remarkably eliminated; and the transverse strength and creep resistance at high temperature are improved. The isometric crystals can effectively prevent cracks from expanding in the orientation direction of the columnar crystals, and the fatigue life and the damage tolerance are remarkably prolonged.

The invention belongs to the technical field of inertia friction welding of high-temperature alloy thin-wall parts, and particularly relates to a homogenized grain type inertia friction welding device and method. The device comprises a base, an inertia friction welding rotation driving mechanism, a supporting shaft assembly, a synchronous vibration and shaping coupling mechanism and an inertia friction welding axial feeding mechanism, and the inertia friction welding rotation driving mechanism, the supporting shaft assembly, the synchronous vibration and shaping coupling mechanism and the inertia friction welding axial feeding mechanism are arranged on the base. The output end of the inertia friction welding axial feeding mechanism is connected with the fixed chuck, and inertia friction welding is conducted on workpieces on the upsetting side and the rotating side through axial feeding. One end of the supporting shaft assembly is connected with the base, the other end of the supporting shaft assembly is rotationally connected with the flywheel, and the supporting shaft assembly is used for supporting and preheating workpieces. The synchronous vibration and shaping coupling mechanism is arranged on the outer side of the welding seam area and used for conducting deformation suppression and grain refinement control on the welding seam area. According to the method, joint grains are refined uniformly, the forming precision is high, near-net forming is achieved, and the production efficiency is high.

The invention discloses a connecting method of an FGH99 double-radial-plate turbine disc based on a nanocrystallization high-entropy alloy middle layer, and belongs to the technical field of welding. A high-entropy alloy middle layer is adopted, nanocrystallization treatment is combined to optimize a microstructure, the nanocrystallization high-entropy alloy middle layer is arranged between an upper FGH99 double-radial-plate turbine disc and a lower FGH99 double-radial-plate turbine disc, diffusion connection is conducted in a vacuum diffusion welding furnace, and the welded FGH99 double-radial-plate turbine disc is obtained. Low-damage solid-phase diffusion bonding is achieved at the welding temperature lower than the solid solution temperature of base metal; meanwhile, the nanocrystallization interlayer structure promotes element diffusion, the diffusion welding period can be greatly shortened, the problems of grain coarsening and performance degradation of a heat affected zone caused by long-time heat preservation in a traditional technology are solved, the technical bottleneck of cooperative regulation and control over the strength and toughness of a high-temperature alloy complex component connection interface is broken through, and the application prospect is wide. And a high-reliability solution is provided for efficient manufacturing of the double-radial-plate turbine disc of the aero-engine, and the double-radial-plate turbine disc is particularly suitable for the long-service-life service requirement under the working conditions of extreme high temperature and cyclic loads.

A tailor-welding, spinning and variable-wall-thickness forming method for a large-sized extension section of a liquid propellant rocket engine, which belongs to the technical field of metal forming. The method comprises: performing laser numerical control machining on a GH3044 superalloy to obtain two chord-tangent circles; performing electron beam welding to obtain a complete circle; performing a vacuum solid solution treatment; performing pre-forming to obtain a shallow dish shape; performing a vacuum solid solution treatment; assembling a variable-wall-thickness flat blank and a spinning mandrel of a first spinning die, and then performing spinning on a spinning machine to form a curved generatrix variable-wall-thickness blank part; performing a vacuum solid solution treatment; and assembling the curved generatrix variable-wall-thickness blank part and a spinning mandrel of a second spinning die, and then performing spinning on the spinning machine to form a curved generatrix variable-wall-thickness part. The present invention is mainly used for the manufacturing of an ultra-large-sized GH3044 extension section of the liquid propellant rocket engine, which has a diameter of 1200 mm and a length of 1500 mm, and the product precision reaches a wall thickness tolerance of + / -0.05 mm for each point and a surface profile of ≤3 mm.

The invention discloses a material regulation and control method for carbides of a high-temperature alloy material difficult to deform. The problem that in the prior art, dispersed distribution of the carbides of the high-temperature alloy material difficult to deform is difficult to obtain is solved. The method comprises the following steps: (1) carrying out two-time homogenization diffusion on a blank in a staged manner, so that solute atoms are completely dissolved in an austenite matrix, and segregation is effectively improved; and (2) optimal process parameters are obtained through finite element numerical simulation, repeated upsetting and drawing coupling multi-pass rolling is adopted, deformation is more sufficient, carbides are broken, migration of grain boundaries is effectively restrained, and the carbide spacing is increased. The method has the beneficial effects that the optimal process parameters are obtained through finite element numerical simulation, solute atoms can be completely dissolved in a matrix through stepped diffusion, and segregation is effectively improved; after repeated upsetting and drawing and multi-pass rolling, a blank is subjected to large deformation, so that carbides are crushed, part of the carbides are separated out along a grain boundary, and the segregation characteristic of a strip is improved.

The invention relates to the technical field of alloy performance prediction, in particular to a nickel-based superalloy creep prediction method considering hot corrosion environment damage, and the method comprises the following steps: obtaining a nickel-based superalloy test piece; calibrating an equivalent hot corrosion damage coefficient according to data of the hot corrosion-creep test; calculating equivalent hot corrosion damage according to the thickness of the control element depletion layer and the equivalent hot corrosion damage coefficient; acquiring a creep constitutive model; equivalent hot corrosion damage is introduced into the creep constitutive model, and a hot corrosion-creep constitutive model is obtained; and according to the hot corrosion-creep constitutive model, predicting the creep of the hot corrosion environment damage of the nickel-based superalloy. According to the method, the creep life of the nickel-based superalloy in the hot corrosion environment can be predicted to be within 1.2 times of an error scattering band, and the creep damage condition of the nickel-based superalloy in the hot corrosion environment can be reflected.

The invention discloses a preparation method of an interface self-reaction strong chemical bonding radiant heat protection multilayer gradient coating, and belongs to the technical field of coating surface modification. The invention aims to solve the problems that the existing coating is high in preparation temperature, long in period, high in cost and not suitable for industrial batch production, the interface bonding between the coating and a nickel-based high-temperature alloy matrix is poor, the coating is easy to crack and even lose efficacy due to mismatching of thermal expansion under high-temperature service, and the thermal protection performance of the traditional coating is insufficient. The interface self-reaction strong-chemical-bonding radiant heat protection multilayer gradient coating and a nickel-based high-temperature substrate are subjected to self-reaction at the interface to form strong chemical bonding, the bonding strength of the coating reaches 15 MPa or above, the emissivity value of the coating reaches up to 0.9, the structure of the coating is kept complete and does not fall off after the coating is oxidized in 1250 DEG C high-temperature static air for 30 h, and the coating has the advantages of being simple in preparation process, low in cost and the like. The method has application potential in a nickel-based high-temperature alloy anti-oxidation radiation thermal protection multifunctional integrated metal thermal protection system for a high-speed aircraft.

The heat accumulating type electric heater comprises a shell and a heat accumulator, a heat preservation and insulation layer is arranged on the inner side of the shell, the shell comprises a first shell section and a second shell section, and the shell is horizontal; the first shell section comprises an inlet section and a diffusion section, and the diffusion section is arranged to be in a conical shape. The diameter of the second shell section is larger than that of the inlet section. The two ends of the diffusion section are connected with the inlet section and the second shell section respectively. The heat accumulator is made of high-temperature-resistant alloy and provided with a plurality of heat exchange holes and heating holes, the heat exchange holes and the heating holes penetrate through the heat accumulator, heating units are arranged in the heating holes, and each heating unit comprises a resistance wire. According to the invention, gas flow heating is realized by adopting resistor direct heating and heat storage, the gas purity is high, and the test accuracy is good. The shell is of a horizontal structure, the length of an outlet pipeline can be reduced, temperature loss can be reduced, the defect that the temperature field is uneven due to the fact that the temperature of the upper portion of the heat accumulator is too high and the temperature of the lower portion is too low in the heat accumulation process can be overcome, and the temperature control precision reaches + / -1 DEG C.

The application discloses a preparation method of high-strength and high-plasticity additive manufacturing nickel-based high-temperature alloy. The application effectively solves the problem of high strength and low plasticity of the nickel-based high-temperature alloy caused by heat treatment of precipitation strengthening, and obtains high-performance nickel-based high-temperature alloy with a tensile strength of 1609 MPa and an elongation rate of 16.6%. The application first uses 1160 DEG C. to 1200 DEG C. solid solution treatment, and then carries out 843 DEG C. / 4 h+760 DEG C. / 8 h two-stage aging heat treatment process, to prepare a multi-scale heterogeneous structure composed of bimodal size distribution grains, nano second phases and nano defects, and the heat-treated product has excellent strength and plasticity. The preparation process is simple, controllable and adjustable, the product has excellent performance, and is convenient for large-scale industrial application.

The invention relates to the technical field of high-temperature alloy preparation, and discloses a method for preparing nitrogen-containing cobalt-chromium-molybdenum alloy by a two-chamber vacuum induction furnace, which comprises the following specific steps: step 1, preparing materials according to components of the nitrogen-containing cobalt-chromium-molybdenum alloy; step 2, sequentially arranging a Si layer, a Mo layer, an N layer, a Cr layer and a Co layer from the bottom of the crucible to the top; and step 3, vacuum melting: S1, vacuumizing treatment; then filling nitrogen; s2, heating and melting, wherein the power of a smelting chamber is set to be 340-360 KW; the power of the smelting chamber is set to be 180-200 KW, and heat preservation refining is carried out; s3, power failure and standing; s4, electrifying again, and adding Mn into the molten steel when the power of the smelting chamber is increased to 300KW; and 4, pouring is conducted, specifically, pouring is started when the temperature of the molten steel rises to 1520-1530 DEG C. The nitrogen-containing cobalt-chromium-molybdenum alloy which is smooth in surface and free of pores inside can be prepared.

The invention belongs to the technical field of TG-DSC testing of metal powder materials, and particularly relates to an anti-oxidation high-precision TG-DSC testing method of high-temperature alloy powder, which comprises the following steps: placing the high-temperature alloy powder in a furnace body of a TG-DSC instrument, carrying out high-purity argon replacement on the atmosphere in the furnace body by taking high-purity argon as furnace body purging gas, and carrying out high-purity argon replacement on the atmosphere in the furnace body; the initial oxygen content in the furnace body is reduced to 0.1 ppm or below; continuously introducing hydrogen-argon mixed gas as flowing gas into the furnace body, controlling the temperature of the furnace body to be increased to a target temperature, and ending the test to obtain a TG curve and a DSC curve of the to-be-tested high-temperature alloy powder; according to the invention, through physical cleaning of oxygen in the furnace body by circulating vacuumizing before testing and chemical cleaning of oxygen permeating into the furnace body by hydrogen-argon mixed gas in the whole process in the testing process, a dual anti-oxidation barrier is constructed, so that oxidation weight increment and oxidation heat release interference of a powder sample are eliminated fundamentally; therefore, the real mass change and the heat flow signal change of the alloy powder sample in the temperature programming process can be accurately measured.

The invention discloses a method for detecting trace elements in a GH4169 high-temperature alloy by using secondary ion mass spectrometry, which specifically comprises the following steps: A1, firstly, carrying out necessary pretreatment on a GH4169 high-temperature alloy sample to remove surface pollution and an oxide layer; a2, selecting a time-of-flight secondary ion mass spectrometer, setting proper analysis parameters, and selecting a double-plasma O2 + ion source. The invention relates to the technical field of metal material trace chemical component analysis. According to the method for detecting the trace elements in the GH4169 high-temperature alloy by using the secondary ion mass spectrometry, a sample pretreatment process of the GH4169 high-temperature alloy is optimized, a double-plasma O2 + ion source and a low-energy electron gun charge compensation system of a time-of-flight secondary ion mass spectrometer are innovatively configured, deep analysis and a three-dimensional reconstruction algorithm are combined, and the trace elements in the GH4169 high-temperature alloy are detected. The sensitivity, the spatial resolution and the data reliability of trace element detection are obviously improved.

The invention relates to the technical field of composite material and metal connection, in particular to a carbon / carbon composite material, a modification method and a nickel-based high-temperature alloy brazing method thereof, a SiC coating and a Mo-Si coating are sequentially embedded and sprayed on the carbon / carbon composite material, and a SiC-MoSi composite coating is formed on the surface of the carbon / carbon composite material through high-temperature heat treatment curing. Due to the existence of the SiC-MoSi composite coating, a CTE transition layer is provided for a connector, residual stress caused by thermal expansion difference is reduced, conditions for generating Mo-based compounds are created, wettability and interface bonding strength of brazing filler metal and base metal can be improved, interface reaction of the base metal can be optimized, a uniform and continuous brazing layer is formed, and the service life of the brazing filler metal is prolonged. Therefore, the brazed connection is higher in strength and more stable, and is more suitable for connection of large-size components and service under the high-temperature condition. The problems that in the prior art, the connection performance of a carbon / carbon composite material and dissimilar metal is poor, and failure is prone to occurring are solved.

The invention relates to a large-scale high-temperature alloy blank casting method capable of controlling the casting size, and belongs to the technical field of high-temperature alloy casting. Measuring a temperature curve of the sand mold after the high-temperature alloy is poured; a process model is created, simulation software is used for carrying out stress deformation simulation, a part model of the casting is created, the simulation result of the part model and the simulation result of the process model are compared, the reduced scale, correction and the machining amount are adjusted in real time, and the process model is obtained; manufacturing a process pattern according to the process model, and producing a sand mold by utilizing the process pattern; creating a sand core model, inputting sand mold temperature curve parameters into simulation software, carrying out sand core deformation stress simulation, measuring sand core deformation stress, and manufacturing a core box according to the sand core model; a core bar is manufactured according to the design, the manufactured core bar is placed in a core box, and a sand core is manufactured; demolding the sand core; combining the sand core with the sand mold to obtain a casting cavity; and molten steel is poured into a casting cavity, and a casting blank is formed after cooling and solidification.

The invention belongs to the field of high-temperature alloy powder metallurgy, and particularly relates to a low-cost and high-performance GH4079 alloy workpiece and a powder metallurgy forming method thereof. The powder metallurgy forming method comprises the steps that GH4079 spherical powder is adopted for preparing a GH4079 alloy blank, solid solution and aging heat treatment is conducted on the GH4079 alloy blank, and a GH4079 alloy workpiece is obtained; solid solution and aging heat treatment is conducted on the GH4079 alloy blank, the whole heat treatment process is simple, the process is simple and convenient, consumed time is short, energy consumption is lower, the method is suitable for industrial application, the obtained GH4079 alloy workpiece is excellent in mechanical property, and under the room temperature condition, the tensile strength is larger than 1500 MPa, the yield strength is larger than 1020 MPa, the ductility is larger than 20%, and the percentage reduction of area is larger than 25%; and under the condition of 650 DEG C / 882 MPa, the endurance life is longer than 210 h.

The invention relates to the technical field of additive manufacturing, and discloses a method and equipment for restraining the crack defect of a high-temperature alloy difficult to weld in laser additive manufacturing. When the gradient of a first molten pool is larger than a preset temperature gradient threshold value, a metal powder scanning area corresponding to each layered slice of a target part can be fused through a composite laser spot; the central light spot is used for providing enough energy to melt metal powder and form a stable molten pool, and the annular light spot preheats the periphery of the molten pool to adjust temperature distribution of the molten pool. The second laser power needed by the annular light spot is determined according to the molten pool center temperature and the molten pool radius generated by the center light spot in the scanning area at the preset scanning speed, so that accurate control over the gradient and the cooling rate of the molten pool is met, the molten pool can be cooled more uniformly in the solidification process, and the solidification quality of the molten pool is improved. The defects of cracks, air holes and the like caused by high temperature gradient and high cooling rate are effectively reduced, and the problem that high-performance high-temperature alloy laser additive manufacturing cracks are difficult to weld is solved.

The invention discloses an annular furnace heat-resistant supporting forged chassis and an additive manufacturing process and a fixing device thereof, and belongs to the technical field of plating of metal materials, and the annular furnace heat-resistant supporting forged chassis comprises the steps that heat-resistant alloy steel base metal with specific components is prepared; carrying out laser texturing and nickel-based alloy bottom layer pretreatment on the surface of the steel plate; performing laser cladding on high-silicon high-temperature alloy powder containing niobium and rare earth elements to form a functional cladding layer, and performing gradient cladding on the edge of the atmosphere guide hole; and finally, carrying out heat treatment and assembling with a fan-shaped refractory brick fixing device. A composite oxide film and a multi-scale strengthening system are constructed, hydrogen resistance and brittleness resistance are effectively achieved, interface thermal stress is relieved, cracking and stripping of a cladding layer are avoided, a fixing device adapts to thermal expansion, the atmosphere is dredged, and the annealing uniformity of a steel coil is improved; the problems of creep deformation, hydrogen embrittlement, cladding layer stripping and thermal stress cracking of a traditional supporting component under the conditions of high temperature, heavy load and nitrogen and hydrogen atmosphere are solved.

The invention relates to a thread detection method, system and equipment for a high-temperature alloy fastener. The method comprises the following steps: firstly, acquiring images of a thread to be detected from multiple observation angles, constructing a first image set, and registering the first image set to form a second image set; then, constructing a phase difference image based on the second image set, and extracting thread disturbance characteristics in combination with a direction sensitive filter bank to generate a disturbance enhanced image; and finally, through analysis of the disturbance enhancement image, whether micro-damage exists on the surface of the thread is identified, and an identification result is output. Therefore, on the premise that the thread structure is not damaged, high-precision automatic identification of tiny surface defects can be achieved, the technical problems that traditional visual inspection is poor in stability, low in efficiency and weak in micro-damage identification capacity are solved, and the reliability and the intelligent level of thread detection of the high-temperature alloy fastener are effectively improved.

The application discloses a preparation method of fine-grain high-strength GH4720Li alloy small-size rod, and specifically comprises the following steps: preparing a GH4720Li alloy blank; pretreating the GH4720Li alloy blank; hot-rolling the GH4720Li alloy blank to obtain a GH4720Li alloy rod; and using the residual heat after hot rolling to heat straighten the GH4720Li alloy rod to obtain a GH4720Li alloy small-size rod. The GH4720Li alloy small-size rod prepared by the method has a diameter of 15mm-20mm, a grain size of 10-13, a room-temperature tensile strength greater than 1620MPa, and a 650 DEG C tensile strength greater than 1450MPa, and can be used to manufacture high-performance high-temperature alloy blades for aero-engines.