201 results about "Single crystal superalloy" patented technology

The invention relates to the technical field of analysis and detection, in particular to a micro-area distribution detection method for micro and / or trace component elements in nickel-based single crystal superalloy. According to the method, the conventional common element distribution detection means (EPMA, EDS, TOF-SIMS, TEM and EELS) are combined, the detection limit and the detection advantages are referred, different devices are reasonably utilized by analyzing different phase structure characteristics, quantitative or semi-quantitative element micro-area distribution analysis is quickly and effectively realized, the use requirements on high-precision devices are reduced, and the method is suitable for large-scale popularization and application. And the cost and the test difficulty are greatly reduced.

The invention relates to the technical field of turbine blades, in particular to a single-crystal high-temperature alloy turbine blade shell and a preparation method thereof.The shell comprises a sprue cup, a sprue, a cross gate, a slag collecting groove, a seed crystal cavity and a seed crystal growth cavity; wherein the two ends of the sprue are respectively connected with the sprue cup and the cross gate; the seed crystal cavity is vertical to the other end of the cross gate and the inlet channel of the slag collecting groove and is positioned below the seed crystal growth cavity; and the seed crystal growth cavity is respectively communicated with the seed crystal cavity, the slag collecting groove and the cross gate. According to the arrangement mode of the seed crystal, a gap between the seed crystal and the seed crystal cavity is eliminated, and the seeding defect caused by the existence of the gap is avoided. And the length of a seed crystal paste area is obviously reduced by designing a pouring gate structure and a slag collecting groove, so that the seeding defect in the seeding process of the seed crystal is avoided as much as possible.

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 discloses a fatigue life evaluation method for a single-crystal high-temperature alloy blade with a recrystallization defect, and relates to the technical field of blade life evaluation, and the method comprises the following steps: obtaining single-crystal high-temperature alloy data through a first experiment, and carrying out data analysis; a three-dimensional finite element model of the single-crystal high-temperature alloy blade is constructed, and first simulation of crack propagation is carried out; and constructing a recrystallization defect-fatigue life database. According to the fatigue life evaluation method for the single-crystal high-temperature alloy blade with the recrystallization defect, the fatigue life of the single-crystal high-temperature alloy blade with the recrystallization defect is predicted in a damage-free mode, the serviceable blade can continue to serve, and the economic loss of blade scrapping caused by dissection is reduced; the fatigue life of the blade is evaluated on the basis of crack parameters such as initial crack positions, initial crack front edge shapes and three-dimensional crack propagation tracks generated by recrystallization defects distributed at different parts of the blade, and the evaluation result is more accurate.

A nickel-based single-crystal high-temperature alloy brazing repair material comprises first brazing filler metal and second brazing filler metal, the first brazing filler metal comprises brazing powder, and the second brazing filler metal comprises evenly-mixed brazing powder and base metal powder which is the same as a part material to be repaired; the brazing powder comprises, by weight, 8%-18% of Cr, 3%-12% of Co, 1%-6% of W, 1%-6% of Ta, 2%-6% of Al, 1%-5% of B, not more than 4% of Mo, not more than 5% of Hf, not more than 3% of Re and the balance Ni and inevitable impurities. The weight ratio of the brazing powder in the second brazing filler metal is 5%-50%. The repair material can effectively perform brazing repair on a large-size gap of 0.25 mm or above. The invention further provides a nickel-based single crystal high-temperature alloy brazing repair method.

The invention relates to the technical field of single-crystal high-temperature alloys, in particular to a control method for dendritic crystal spacing in the growth process of a multi-layer module single-crystal high-temperature alloy. The method comprises the following steps: fixing a pre-prepared multi-layer module single crystal alloy ceramic shell with a graphite center column on a water-cooling copper disc of a liftable bracket of multi-layer module directional solidification equipment; after the mother alloy is smelted, standing is conducted, and the smelting furnace is controlled to pour alloy liquid into the multi-layer module single crystal alloy ceramic shell; and the multi-layer module single crystal alloy ceramic shell filled with the alloy liquid is pulled into the solidification cavity under the driving of the transmission device, so that directional solidification is realized, and the small-dendrite-spacing single crystal high-temperature alloy test bar is obtained. According to the method, under the condition of not changing the casting process, the problems of overlarge dendritic crystal spacing and isotherm inclination caused by the shadow effect of radiation heat dissipation in the directional solidification process of the multi-layer module single crystal high-temperature alloy are solved, and the qualified rate of large-batch production of single crystal blades is effectively increased.

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 discloses a mixed crystal defect resistant single-crystal high-temperature alloy material for additive manufacturing and a preparation method of the single-crystal high-temperature alloy material, and belongs to the field of high-temperature alloy materials. The alloy consists of a matrix gamma phase, a strengthening phase gamma'phase and a carbide phase, and comprises the following components in percentage by weight: 0.06 to 0.18 percent of C, 6.0 to 8.0 percent of Cr, 10 to 13 percent of Co, 3 to 5 percent of W, 1.0 to 2.0 percent of Mo, 5.5 to 7.0 percent of Ta, 5.0 to 6.2 percent of Al, 0 to 1.5 percent of Re, 0 to 3 percent of Ru, 1.0 to 1.6 percent of Hf and the balance of Ni. The alloy has the characteristics of high strength and easiness in additive manufacturing, also has good structure stability, and is particularly suitable for additive manufacturing of high-temperature parts in the fields of spaceflight, aviation, ships, petrochemical engineering and the like.

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 technical field of single-crystal high-temperature alloy welding, in particular to a brazing method for DD26 single-crystal high-temperature alloy and MX62 wear-resistant alloy. The method specifically comprises the following four steps: step 1, brazing treatment; step 2, primary aging heat treatment; step 3, gas phase aluminizing; and 4, coating diffusion and secondary aging co-treatment. Brazing treatment (1180 DEG C), primary aging heat treatment (1080 DEG C), gas-phase aluminizing (950 DEG C) and coating diffusion and secondary aging co-treatment (870 DEG C) are carried out, and the temperature of the heat treatment process is reduced from high to low. According to a blade structure obtained after welding, the gamma'phase keeps the original cubic shape and is small in size, dendritic crystal trunk and dendritic crystal gamma 'phase are small in size difference and free of raft formation, meanwhile, recrystallization does not occur on the surface of a blade body, a strengthening phase in MX62 abrasion-resistant alloy does not decompose, the tensile strength of a welded joint at the temperature of 950 DEG C reaches 361 MPa, the shear strength at the temperature of 950 DEG C reaches 326 MPa, and the endurance life of the welded joint at the temperature of 950 DEG C / 75 MPa reaches 96 h.

The invention discloses a fifth-generation nickel-based single-crystal high-temperature alloy with a high-stability structure, which comprises the following components in percentage by mass: 2.5 to 4.5 weight percent of chromium, 6 to 10 weight percent of cobalt, 3 to 5 weight percent of tungsten, 1 to 3 weight percent of molybdenum, 5 to 6.5 weight percent of rhenium, 5 to 7 weight percent of aluminum, 7 to 10 weight percent of tantalum, 0 to 0.2 weight percent of hafnium, 3.6 to 5 weight percent of ruthenium, 0 to 0.05 weight percent of carbon, 0 to 0.03 weight percent of yttrium and the balance of nickel. The total mass fraction of rhenium, tungsten and molybdenum in the alloy is rhenium + tungsten + molybdenum less than or equal to 13.5%, and the mass fraction proportional relation of tungsten and molybdenum is tungsten / molybdenum gt; 2.2, the mass fraction proportion relation of tantalum and aluminum is that tantalum / aluminum is greater than or equal to 1.1. The invention further discloses a heat treatment process of the fifth-generation nickel-based single-crystal high-temperature alloy with the high-stability structure. The nickel-based single-crystal high-temperature alloy with high temperature bearing capacity is developed on the basis of high-temperature stability of a structure by synergistic stability elements and strong promotion of TCP phase precipitation element content, the temperature bearing capacity reaches the level of a typical fifth-generation single-crystal high-temperature alloy, and the endurance life is larger than or equal to 1000 h at the temperature of 1100 DEG C / 137 MPa.

The invention relates to a nickel-based single-crystal high-temperature alloy and a preparation method thereof, and relates to the technical field of single-crystal high-temperature alloys. According to the main technical scheme, the nickel-based single crystal high-temperature alloy is prepared from the following chemical components in percentage by mass: 6 to 8 weight percent of Cr, 7 to 9 weight percent of Co, 1 to 3 weight percent of Mo, 7 to 9 weight percent of W, 5 to 7 weight percent of Ta, 5 to 7 weight percent of Al, 0.5 to 2 weight percent of Ti, 0.5 to 1 weight percent of Nb, 0.008 to 0.013 weight percent of N and the balance of Ni. After the Nb and the trace element N are introduced, the void ratio in the as-cast alloy is reduced by 35%, the void ratio of the heat-treated alloy is reduced to 28% after treatment of a set heat treatment process, and the high-temperature strength and the endurance life of the low-cost second-generation single-crystal high-temperature alloy are further improved. The nickel-based single-crystal high-temperature alloy is particularly suitable for manufacturing hot-end high-temperature components with long service life and high reliability in the fields of aviation, aerospace, energy and the like.

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 present application relates to the technical field of detection of recrystallization in single-crystal high-temperature alloy blades, and discloses a method and apparatus for detecting recrystallization in a single-crystal high-temperature alloy blade, a device, and a storage medium. The method comprises: constructing a single-crystal high-temperature alloy recrystallization database; performing a creep test on a single-crystal high-temperature alloy creep specimen containing recrystallization, and obtaining a corresponding single-crystal high-temperature alloy and a recrystallization damage tolerance of a corresponding blade thereof under a corresponding service condition; acquiring corresponding parameters of coordinate information of a deformation position of a single-crystal high-temperature alloy blade under test, inputting said parameters into the database, and obtaining a cross-sectional recrystallization area fraction and a maximum recrystallization depth of the deformation position of the single-crystal high-temperature alloy blade; and determining whether the obtained cross-sectional recrystallization area fraction and maximum recrystallization depth of the deformation position are less than the corresponding recrystallization damage tolerance, and obtaining a detection result. The accuracy of detection is high, the yield rate is improved, and a reference is provided for the formulation of production quality acceptance standards for single-crystal high-temperature alloy blades or test rods and the expansion of non-destructive testing.

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 single-pixel data acquisition and analysis method based on a neutron time-of-flight technology. The method comprises the following steps: carrying out preliminary orientation on a single crystal to be detected; performing a TOF diffraction experiment on the to-be-detected single crystal, and rotating a diffraction spot of a to-be-detected crystal face to a specified position of a detector according to a preliminary orientation result; screening a target pixel according to single-pixel diffraction data on the detector to obtain a target pixel position and a diffraction spectrum thereof; fitting processing is carried out to acquire interplanar spacing and full width at half maximum of a specific diffraction crystal face of each pixel point; dot matrix strain of different target pixels is calculated, an interplanar spacing distribution diagram, a dot matrix strain distribution diagram and a full width at half maximum distribution diagram of specific crystal faces of the target pixels are drawn, and a mismatch degree distribution diagram can also be drawn for single-crystal high-temperature alloy. The method can be used for extracting the microstructure information of different areas in the diffraction volume of the single crystal material, and has important significance for perfecting the design, preparation and production process and service damage evaluation of the single crystal material and prolonging the service life of the material.

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 relates to the technical field of high-temperature alloys, in particular to application of a nickel-based single-crystal high-temperature alloy in a high-temperature working scene. Different from the strategy that the high-temperature creep property of a [001]-oriented nickel-based single-crystal high-temperature alloy is improved by adding refractory elements, [111] orientation is used as the alloy loading direction, the crystal anisotropy of the single-crystal high-temperature alloy is utilized, and a / 2lt is adjusted; 110gt, 110gt; the Schmidt factor of the slip system enables a / 2lt of starting; 110gt, 110gt; base dislocation cannot generate alt through dislocation reaction; 100 gt; the overdislocation is realized, and the alt is inhibited; 100 gt; and in the super-dislocation forming process, the high-temperature creep property of the nickel-based single-crystal high-temperature alloy is greatly improved while refractory elements are not added and extra cost is not increased.