152 results about "Single crystal superalloy" patented technology

The invention belongs to the technical field of nickel-based single-crystal superalloy materials, and provides a nickel-based single-crystal superalloy and a strengthening method thereof, and the method comprises the following steps: cleaning and drying the nickel-based single-crystal superalloy to be strengthened; strengthening parameters and a shock strengthening path are set, and the nickel-based single crystal high-temperature alloy is subjected to absorption-layer-free laser shock strengthening; the strengthened nickel-based single crystal high-temperature alloy is cleaned and dried; polishing parameters and a polishing path are set, femtosecond laser oblique incidence polishing is conducted on the strengthened area of the nickel-based single crystal superalloy, and surface ablation is removed; the polished nickel-based single crystal high-temperature alloy is cleaned and dried; according to the method, the nickel-based single crystal superalloy is strengthened by adopting an absorption-layer-free laser shock strengthening mode, and femtosecond laser oblique incidence polishing is adopted, so that the procedures of pasting and removing an absorption layer for multiple times are avoided, the processing efficiency of laser shock strengthening is improved, and deterioration of the surface quality of a material caused by laser ablation is avoided.

The invention discloses a nickel-based single-crystal high-temperature alloy with high structure stability and a preparation method thereof, and relates to the technical field of high-temperature alloys. The nickel-based single crystal high-temperature alloy provided by the invention is prepared from the following components in percentage by mass: 5 to 7 percent of Al, 7.5 to 10 percent of Co, 5 to 7 percent of Cr, 0.1 to 0.2 percent of Hf, 0 to 2 percent of Mo, 5.5 to 7.5 percent of Ta, 0 to 1 percent of Ti, 8 to 10 percent of W, 0.02 to 0.05 percent of C, 0.003 to 0.005 percent of B and the balance of Ni. According to the invention, by controlling the ratio of elements and avoiding the addition of Re, the precipitation temperature of a harmful TCP phase is obviously reduced to about 840 DEG C on the basis of maintaining a sufficient solid solution strengthening effect, and the long-term stability of the structure is greatly improved. The high-temperature mechanical property of the alloy provided by the invention reaches the level equivalent to that of a traditional Re-containing second-generation single-crystal alloy and is remarkably superior to that of foreign Re-free single-crystal alloys MD2 and Rene N500, and the nickel-based single-crystal high-temperature alloy with high structure stability successfully realizes the unification of low cost and high performance, and is suitable for industrial production. And a reliable material solution is provided for manufacturing the heavy-duty gas turbine blade with higher market competitiveness.

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 discloses an IC21 single-crystal high-temperature alloy diffusion welding method based on multi-field assistance and a high-entropy interlayer, and belongs to the technical field of welding. Nano high-entropy intermediate layer foil composed of 35% of Ni, 22% of Cr, 20% of Al, 7% of Re, 5% of Ta, 2% of Y, 7.5% of Si and 1.5% of B is adopted and placed between an upper layer IC21 single-crystal high-temperature alloy and a lower layer IC21 single-crystal high-temperature alloy, liquid-phase diffusion welding is conducted in a vacuum diffusion welding furnace by introducing the multi-field coupling effect of an ultrasonic vibration field, a pulsed magnetic field and an electric field, energy field superposition is achieved through multi-field coupling through space-time cooperation, and the high-temperature alloy is obtained. The pulse frequency of the ultrasonic vibration field is matched with the alternating frequency of the magnetic field; a diffusion channel is opened by an electric field, dendritic crystal regulation and defect repair are realized by mid-term superposition of an ultrasonic vibration field and a pulsed magnetic field, finally directional migration and dendritic crystal segregation suppression of a liquid film are realized, the technical bottleneck of high-integrity connection of an ultrathin-wall structure of a single-crystal turbine blade is broken through, and the extreme working condition service requirement of a sixth-generation engine is met.

The invention relates to the technical field of machining, and discloses a single-crystal high-temperature alloy grinding machining plastic deformation layer thickness identification method and system, and the method comprises the steps: collecting a port section image through the high-resolution imaging capability of a scanning electron microscope, and carrying out the preprocessing of the collected image, utilizing a Canny edge detection algorithm to accurately identify edge information in the image; performing crystal edge frame identification by using a Hough LinesP rectangular detection algorithm to calculate the crystal direction angle of each crystal in the image to distinguish the crystals in an undeformed area and a deformed area and the maximum depth value of the crystals in the corresponding area, and combining a preset crystal angle identification threshold value in a plastic deformation area after the single crystal high-temperature alloy material is ground and processed to identify the crystal edge frame of the single crystal high-temperature alloy material. And obtaining the thickness value of the plastic deformation area after the single-crystal high-temperature alloy material is ground. According to the method, the thickness value of the plastic deformation area of the ground single-crystal high-temperature alloy material can be accurately analyzed, and powerful technical support is provided for control and optimization of material machining quality.

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 invention discloses a DD10 single-crystal high-temperature alloy connecting method based on an intermediate layer and magnetic field assistance, and belongs to the technical field of metal welding. According to the method, a NiCo22Cr20W10Mo7Ta5Ge5Re2Hf0. 8La0. 2 middle layer is adopted, the middle layer is arranged between an upper layer of DD10 single crystal high-temperature alloy and a lower layer of DD10 single crystal high-temperature alloy, diffusion bonding is conducted in a vacuum diffusion welding furnace embedded into a magnetic field generator, and a welding piece of the DD10 single crystal high-temperature alloy is obtained; under the synergistic effect of the two components, the microstructure and the physical and chemical process of the material are regulated and controlled, atomic diffusion is promoted, the microstructure is optimized, the effects of refining grains, controlling liquid level deformation and removing inclusions are achieved, the mechanical property of a joint is improved, the welding quality and efficiency are remarkably improved, and a low-temperature welding workpiece has the excellent performance of high-temperature service; and a high-reliability solution is provided for efficient welding manufacturing of the DD10 single-crystal high-temperature alloy of the aero-engine blade.

The present application relates to single crystal superalloy blade recrystallization detection technical field, disclose a kind of single crystal superalloy blade recrystallization detection method, device and equipment, the method includes: constructing single crystal superalloy recrystallization database;The single crystal superalloy creep sample containing recrystallization is subjected to creep test to obtain corresponding single crystal superalloy and corresponding blade under corresponding service condition recrystallization damage tolerance;The coordinate information of the deformed position of the single crystal superalloy blade to be detected is obtained;Corresponding parameters are input into database to obtain the cross-sectional recrystallization area fraction and maximum recrystallization depth of the deformed position of the single crystal superalloy blade;Whether the cross-sectional recrystallization area fraction and maximum recrystallization depth of the deformed position obtained are less than the corresponding recrystallization damage tolerance is judged to obtain detection result.The detection accuracy is high, the yield is improved, and the production quality acceptance standard of single crystal superalloy blade or test bar, nondestructive testing is expanded to provide reference.

The invention discloses a method and a device for predicting creep deformation of a nickel-based single-crystal high-temperature alloy under creep-oxidation interaction, and belongs to the technical field of material engineering and computational mechanics, and the method is based on microstructure distribution characteristics of the nickel-based single-crystal high-temperature alloy after a creep test in vacuum and atmospheric environments. According to the method, a dynamic growth multilayer geometric model considering oxidation influence is established, and a method capable of predicting alloy creep deformation in different environments is developed by combining a creep constitutive model considering microstructure evolution based on a test observation result. The method mainly comprises the following steps: providing a multilayer geometric model considering oxidation influence; establishing growth kinetic models of different layers; obtaining microstructure evolution laws at different depths; building a multi-scale creep deformation prediction framework considering microstructure evolution; and acquiring model parameters and predicting creep deformation. The invention provides a set of method capable of accurately predicting the creep deformation of the alloy in different environments.

The invention discloses a single-crystal high-temperature alloy and ceramic matrix composite material-based functional partition type composite blade design method, which comprises the following steps of defining a temperature bearing area and a force bearing area of a blade through heat and force simulation; the brazing residual stress is predicted, and the optimal assembly gap between the two partition interfaces of the temperature bearing area and the force bearing area of the composite blade is optimized and determined; predicting peak stress, and optimizing and determining the optimal position and size of a mechanical locking structure between two partition interfaces of a temperature bearing area and a force bearing area of the composite blade; and through heat-force-flow coupling simulation, the maximum equivalent stress of the composite blade and the bonding strength between partition interfaces are evaluated, and then the design of the composite blade is completed. According to the method, through heat-force-flow coupling simulation and iterative optimization, precise definition of function partitions and cooperative compatibility of mechanical locking and the process are achieved, and the low-stress and high-strength performance of the composite blade in the high-temperature and high-pressure environment is ensured.

The invention discloses a method for avoiding solidification defect formation in a single crystal blade preparation process caused by seed crystal oxidation, and belongs to the technical field of single crystal high-temperature alloy blade preparation. According to the method, by quantitatively detecting the thickness of an oxide layer at the top end of a seed crystal and establishing a mathematical quantitative corresponding relation between the thickness and the heat preservation time of a mother alloy after pouring, a heat preservation process is dynamically regulated and controlled, the oxide layer is fully decomposed or broken, and formation of defects such as mixed crystals and small-angle grain boundaries is effectively inhibited; and meanwhile, the height of the formwork expansion area is synchronously optimized according to the needed heat preservation time, and the macrosegregation problem caused by long-time heat preservation is avoided. Quantification and precision of seed crystal oxidation control are achieved for the first time, the preparation success rate and structure consistency of the single crystal blade are remarkably improved, and the method has the outstanding advantages of being high in process feasibility, low in production cost, wide in application range and the like.

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 invention relates to the technical field of heat treatment of single-crystal castings, and aims to solve the problem that in the production process of single-crystal high-temperature alloy castings, solid solution heat treatment can cause recrystallization of materials, and the problems that existing countermeasures are difficult to effectively solve or can not be effectively solved under the condition that the performance of the materials is not affected. The method for inhibiting recrystallization in the solid solution heat treatment process of the single-crystal high-temperature alloy casting sequentially comprises the steps of S1, pretreatment, S2, recovery heat treatment and S3, solid solution heat treatment. The recovery heat treatment comprises at least one heat treatment cycle, each heat treatment cycle comprises vacuum heat treatment t1, static inert gas partial pressure heat treatment t2, vacuum or micro-reducing atmosphere heat treatment t3 and dynamic inert gas partial pressure heat treatment, the total treatment time of the whole recovery heat treatment is 2-10 h, the temperature range of the recovery heat treatment is Ts-150 DEG C to Ts, and Ts is the solid solution temperature. By improving the heat treatment process, recrystallization of the single crystal casting caused by local plastic strain in the casting process is relieved or even eliminated.

The invention discloses a high-entropy ceramic thermal barrier coating and a preparation method thereof, and relates to the technical field of thermal barrier coating materials. The method comprises the following steps: mixing ZrO2, HfO2, Ta2O5 and various rare earth oxides, and carrying out high-energy wet ball milling, drying, solid solution sintering and crushing to prepare submicron high-entropy ceramic powder; mixing the modified powder with aluminum sol obtained by hydrolyzing aluminum isopropoxide, rare earth nitrate and the like, dispersing, drying and carrying out heat treatment to obtain modified powder coated with aluminum oxide nanoparticles on the surface; carrying out spray drying granulation to obtain spherical agglomerated powder; and finally, a DD6 single-crystal high-temperature alloy matrix is subjected to sand blasting and pre-oxidation treatment, agglomerated powder is deposited on the surface of the matrix through a plasma spraying vapor deposition technology, a columnar crystal coating is formed, and a finished product is obtained through vacuum annealing. The coating prepared through the method is uniform in structure and high in bonding strength, thermal shock resistance and high-temperature phase stability are remarkably improved, and the coating is suitable for surface protection of aero-engine hot end components.

The invention discloses a method and a device for predicting spatial and temporal distribution characteristics of a microstructure of a nickel-based single-crystal high-temperature alloy under creep-oxidation interaction, and belongs to the technical field of high-temperature structural material service performance prediction.The method comprises the following steps: performing creep tests of different temperatures, stresses and durations based on vacuum and atmospheric environments respectively; obtaining microstructure morphology characteristics and microscopic parameter distribution in the nickel-based single crystal superalloy under different environments and test conditions; quantifying the spatial-temporal distribution evolution law of the volume fractions of gamma'phases in the creep samples under different temperatures and stresses in vacuum and atmospheric environments; establishing a periodic cell element model and a microstructure evolution model; and predicting the spatio-temporal evolution law of the channel width of the gamma-phase matrix in the stress creep sample at different temperatures in the atmospheric environment. According to the method, spatial and temporal distribution of the microstructure caused by interaction of creep and oxidation is considered, a microstructure evolution behavior prediction framework is constructed in combination with a physical mechanism, and the distribution rule of the microstructure is accurately described.

The application discloses a kind of high plasticity single crystal high-entropy high-temperature alloy without Fe and Ti and a preparation method thereof.The chemical composition of the alloy includes Co, Ni, Cr, Al, Ta, Mo and W seven elements, and the atomic percentage of each element is Co 35-45at%, Ni 30-40at%, Cr 3-5at%, Al 10-13at%, Ta 1-4at%, Mo 1-3ar% and W 3-5at%.The preparation method includes the following steps: sequentially putting elemental Co, Ni, Cr, Ta, Mo and W into the crucible of vacuum induction melting furnace for heating and melting, adding elemental Al when the temperature rises to the refining temperature, and pouring into master alloy ingot;using high-speed solidification Bridgeman method and seed crystal method to prepare single crystal high-entropy high-temperature alloy test rod with <001> grain orientation;and sequentially carrying out solid solution treatment, primary aging and secondary aging on the single crystal high-entropy high-temperature alloy test rod, to obtain the high plasticity single crystal high-entropy high-temperature alloy without Fe and Ti.The single crystal high-entropy high-temperature alloy of the application has the advantages of high-entropy alloy and single crystal high-temperature alloy, and has excellent room temperature and high temperature mechanical properties.

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 discloses a design method and system of a single-crystal high-temperature alloy solid solution heat treatment system, relates to the cross technical field of numerical simulation and material processing, and comprises the following steps: based on the relationship between element concentration and solidus temperature, determining the solidus temperature distribution of a cast single-crystal high-temperature alloy sample according to the element concentration distribution extracted from the cast single-crystal high-temperature alloy sample; adopting a phase field method to simulate solid solution heat treatment of the cast single-crystal high-temperature alloy sample, so as to obtain the element concentration distribution under the initial melting temperature and heat preservation for one simulation time step, and mark the element concentration distribution after treatment as the element concentration distribution, and determine the segregation coefficient of each element; when the segregation coefficients of all elements are within a preset range, marking all initial melting temperatures and corresponding current simulation times as heat treatment simulation results, and then determining the actual solid solution heat treatment system of the cast single-crystal high-temperature alloy sample. The application has the advantages of short time consumption, high efficiency and low cost.

The invention belongs to the technical field of alloy hydrogen embrittlement resisting processes, and relates to a hydrogen embrittlement resisting nickel-based single crystal high-temperature alloy and a preparation method thereof. Comprising the following steps: weighing simple substance raw materials of Ni, Cr, Co, Mo, W, Ta, Al, Re, Nb, Hf and C, smelting the raw materials for multiple times to obtain a mother alloy ingot of the nickel-based single crystal superalloy, processing the mother alloy ingot into a rod, cleaning, drying, heating to a preset temperature in an argon atmosphere, preserving heat for a preset time at the preset temperature, and cooling to obtain a nickel-based single crystal superalloy test rod; the method comprises the following steps: carrying out gradient solid solution heat treatment on a nickel-based single-crystal high-temperature alloy test bar, cooling to obtain a solid-solution nickel-based single-crystal high-temperature alloy test bar, and carrying out primary aging heat treatment to obtain the hydrogen embrittlement-resistant nickel-based single-crystal high-temperature alloy. The nickel-based single crystal superalloy prepared by the method disclosed by the invention can still keep relatively high elongation and reduction of area after being charged with hydrogen, the hydrogen embrittlement sensitivity of the nickel-based single crystal superalloy is obviously lower than that of a solid solution structure, and the nickel-based single crystal superalloy shows excellent comprehensive performance.

The invention discloses a (Ni, Pt) Al / Ni composite coating of a single-crystal high-temperature alloy, the composite coating takes the single-crystal high-temperature alloy as a matrix, the composite coating is a single-layer coating formed by single-phase beta-(Ni, Pt) Al, and no mutual diffusion zone exists between the composite coating and the matrix. The preparation method comprises the following steps: firstly, pre-electroplating Ni on the surface of the substrate as a transition layer, then electroplating a Pt layer, carrying out hydrogen removal and diffusion vacuum annealing treatment and high-temperature low-activity gas phase aluminizing treatment, and finally, forming the composite coating on the surface of the substrate. The composite coating and the pre-plated Ni layer are introduced as a diffusion barrier layer, so that direct contact between the Pt layer and the matrix is effectively blocked, mutual diffusion between the Pt layer and the matrix is inhibited, damage to a coherent phase structure in the matrix and formation of a TCP precipitated phase caused by mutual diffusion of Ni and Al are delayed, formation of a secondary reaction zone is delayed, and the material stability is ensured. The composite coating provided by the invention is a high-temperature protective coating with slow oxidation weight gain at high temperature.

The invention belongs to the technical field of laser additive manufacturing, and particularly discloses a nickel-based single crystal superalloy laser additive preparation method and device system. The device system comprises a forming table top, a laser cladding wire feeding assembly, a cooling device and a direct-current power source. The forming table board consists of a seed crystal unit, a cooling unit and a supporting unit which are integrally formed and made of a nickel-based single crystal high-temperature alloy material; the laser cladding wire feeding assembly is composed of a laser generator and a wire feeding mechanism. The cooling device communicates with the cooling unit of the forming table top through a pipeline, the positive electrode of the direct-current power source is connected with the seed crystal unit of the forming table top, and the negative electrode of the direct-current power source is connected with the nickel-based single-crystal high-temperature alloy wire of the laser cladding wire feeding assembly. According to the device system, the stability and high temperature gradient between the forming table top and the molten pool in additive manufacturing can be ensured, and crystals are promoted to grow in the specific direction, so that the selectivity of the crystals is improved, and formation of mixed crystals in the additive manufacturing process is inhibited.

The invention discloses a low-density low-rhenium nickel-based single-crystal high-temperature alloy which comprises the following chemical components in percentage by weight: 2.8 to 6 percent of chromium, 5.5 to 9 percent of cobalt, 4 to 7 percent of molybdenum, 4 to 6 percent of tungsten, 4 to 7 percent of tantalum, 4 to 7 percent of aluminum, 0.07 to 0.3 percent of hafnium, 2 to 4 percent of rhenium, 1.5 to 2.5 percent of ruthenium, 0 to 0.01 percent of yttrium and the balance of nickel. Wherein in percentage by weight, the content relation of the molybdenum and the tungsten is 0.7 lt; molybdenum / tungsten lt; the content relation of molybdenum and rhenium is that molybdenum / rhenium is greater than or equal to 1.1. The strength of the alloy is improved by increasing the content of molybdenum, the contents of tungsten and rhenium are reduced, precipitation of harmful phases is reduced by comprehensively regulating and controlling the proportion of elements in rows and columns, it is ensured that the creep life of the alloy reaches the fourth-generation single crystal level, meanwhile, the alloy has the room-temperature density not higher than 8.9 g / cm < 3 >, the high-temperature low-stress durability of the alloy reaches the typical fourth-generation single crystal high-temperature alloy level, and the service life of the alloy is prolonged. The method is suitable for manufacturing advanced aero-engines.

The invention provides a method for producing a high-purity nickel raw material for a single-crystal high-temperature alloy, and relates to the technical field of metallurgical industry. According to the method, a vacuum induction melting furnace is adopted, a magnesium oxide crucible is used, Ni9996 electrolytic nickel is remelted, the temperature of the electrolytic nickel is slowly increased in a high-vacuum environment, and oxygen, nitrogen and hydrogen in the electrolytic nickel are gradually removed; the electrolytic nickel is molten and then subjected to high-temperature refining, and volatile impurity elements such as Pb, Zn, As, Tl, Ag and Bi in the electrolytic nickel are removed under the high-temperature, high-vacuum and electromagnetic stirring effects; after high-temperature refining, cooling and film forming are carried out, metal calcium, nickel-magnesium intermediate alloy and high-purity calcium fluoride are added in batches in a trace manner, so that impurity elements in electrolytic nickel are subjected to accurate slagging, oxygen, nitrogen, phosphorus, sulfur and other impurity elements are removed, various generated slag is removed through a rocking furnace grate slag and a filter screen, and therefore the purity and quality of nickel are improved. The method is green and environment-friendly, the impurity removal of the electrolytic nickel raw material is realized, and an enterprise can generate excellent economic benefits.

The invention relates to a bonding connection method of nickel-based single crystal superalloy and an obtained product. The method comprises the following steps that two or more nickel-based single-crystal high-temperature alloy blocks to be bonded and connected are provided, and the surface roughness Sa value of the surfaces to be bonded of the nickel-based single-crystal high-temperature alloy blocks is 80 nm or lower; carrying out bonding connection on the nickel-based single-crystal high-temperature alloy block material in a vacuum environment under the pressure intensity of 20-100 MPa; and cooling to obtain the bonded nickel-based single-crystal high-temperature alloy connecting piece of which the microstructure at the bonding interface is consistent with that of the original single-crystal high-temperature alloy block. The bonding connection nickel-based single-crystal high-temperature alloy product obtained by the method can realize direct bonding combination among atoms on a bonding interface, and has a microstructure equivalent to that of a base material and excellent mechanical properties.

The present invention discloses a double-walled air-cooled blade simulation part and its preparation method and preparation system, which relate to the field of testing technology. The above-mentioned double-walled air-cooled blade simulation part preparation method can prepare a single crystal high-temperature alloy double-layer thin-walled spoiler column simulation part with controllable secondary orientation and characteristic structure. In practical applications, by adjusting the assembly method and assembly structure of the casting intermediate, single crystal high-temperature alloy double-layer thin-walled spoiler column castings with different primary orientations, secondary orientations, wall thicknesses and spoiler column sizes can be prepared to meet various service test requirements. The double-walled air-cooled blade simulation part preparation system is mainly used to implement the above-mentioned double-walled air-cooled blade simulation part preparation method. The prepared double-walled air-cooled blade simulation part fills the current technical gap in simulation parts for double-walled air-cooled structure turbine blades, and can provide accurate service test data for optimizing the complex cooling structure of turbine blades and improving the service life of turbine blade structures.

The application discloses a material for connecting single-crystal superalloy and polycrystal superalloy and a preparation and use method thereof, and the material comprises low-melting-point Ni-Ti alloy powder and high-melting-point Ni-based alloy powder. The material can realize rapid high-performance connection of the single-crystal superalloy and the polycrystal superalloy. The application belongs to the technical field of alloy material connection.

The present invention discloses a DD10 single crystal high temperature alloy connection method based on an intermediate layer and a magnetic field, which belongs to the technical field of metal welding. 22 Cr 20 W 10 Mo7Ta5Ge5Re2Hf 0.8 La 0.2 The middle layer is placed between the upper and lower layers of DD10 single crystal high-temperature alloy, and diffusion connection is carried out in a vacuum diffusion welding furnace embedded with a magnetic field generator to obtain a welded part of DD10 single crystal high-temperature alloy; under the synergistic effect of the two, the material microstructure and physical and chemical processes are regulated, atomic diffusion is promoted, the microstructure is optimized, the grain size is refined, the liquid surface deformation is controlled, and inclusions are removed, thereby improving the mechanical properties of the joint, significantly improving the welding quality and efficiency, and realizing the excellent performance of low-temperature welded workpieces for high-temperature service, providing a high-reliability solution for the efficient welding and manufacturing of DD10 single crystal high-temperature alloy for aircraft engine blades.

The invention provides a nickel-based single-crystal high-temperature alloy component laser epitaxy repairing method based on energy field regulation and dynamic crystal selection. The nickel-based single-crystal high-temperature alloy component laser epitaxy repairing method comprises the steps that a damaged area is subjected to cleaning treatment and three-dimensional scanning, matrix crystallographic orientation is obtained, a three-dimensional thermal-structure finite element simulation model is established, and a repairing basic process is determined; homogeneous alloy powder is adopted, a laser machining head with a coaxial powder feeding nozzle is used for repairing the damaged area, in the repairing process, auxiliary induction heating is conducted, and the temperature field and the morphology of a molten pool are monitored; if the G / R is lower than the preset critical threshold value, the auxiliary induction heating power is dynamically enhanced; if the tail of the molten pool is disturbed, an ultrasonic vibration field is applied to the molten pool; and treating after repairing. A repair system is also provided. According to the method, the epitaxial growth of the single crystal consistent with the crystallographic orientation of the matrix can be dynamically guided, so that the nickel-based single crystal high-temperature alloy component can be repaired, the repair success rate and the structure consistency are remarkably improved, and the epitaxial proportion of the single crystal is increased to 95% or above.

A method for laser repair of multi-energy field-assisted single-crystal superalloy belongs to the technical field of laser melting deposition repair. The present invention aims to solve the problems that the process window of existing single-crystal laser melting deposition repair is small, which limits the repair height and quality of single crystals. Method: First, place the single-crystal nickel-based superalloy at the central axis position of the hook-shaped magnetic field generator, and the surface to be repaired is parallel to the central plane of the hook-shaped magnetic field; Second, set the process parameters of laser melting deposition, the intensity of the hook-shaped magnetic field and the initial substrate cooling temperature; Third, use a coaxial powder feeding laser head to deposit on the surface to be repaired of the single-crystal nickel-based superalloy multiple times, and adjust the substrate cooling temperature during the deposition process. The present invention is used for laser repair of multi-energy field-assisted single-crystal superalloy.

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.