42 results about "Grain orientation" patented technology

The invention discloses a multi-scale simulation method for a thermal compression deformation behavior of TC4 titanium alloy, and belongs to the field of metal material processing simulation. Comprising the following steps: 1, carrying out thermal compression experiments at different temperatures to obtain a deformed sample; 2, analyzing the grain orientation, orientation difference angle and texture evolution of the sample by using an electron back scattering diffraction technology; 3, constructing a crystal plasticity finite element model, and simulating a polycrystalline deformation process; 4, constructing a molecular dynamics model, and simulating phase change and dislocation evolution in thermal compression and cooling processes; and 5, based on a multi-scale simulation result, hot working parameters are optimized, dynamic recrystallization and a beta-to-alpha phase change path are regulated and controlled, and grain refinement and performance homogenization are achieved. The invention discloses a correlation mechanism of the microstructure and the mechanical property in TC4 titanium alloy thermal compression deformation, and provides a theoretical basis for optimization of a thermal processing technology of a high-performance titanium alloy component in the aerospace field.

The invention discloses a method for evaluating a fatigue weak area of a welded joint based on crystal plasticity, which aims at the problem of fatigue failure of the welded joint caused by complex microstructures such as grain orientation difference and uneven grain size distribution, establishes a quantitative correlation model of grain orientation and size evolution through CPFEM, and combines a macro-micro cross-scale analysis method to evaluate the fatigue weak area of the welded joint. And precise prediction of local stress concentration and crack initiation behaviors of the welding joint under a real fatigue load working condition is realized, so that scientific evaluation of a fatigue weak region is completed. According to the method, an innovative framework of fatigue weak area evaluation is constructed through load working condition reduction and grain characteristic multi-scale coupling, so that excessive simplification of a traditional method on real load conditions is made up, the limitation that a traditional model is difficult to couple a microstructure and a real load is overcome, and the fatigue weakening quantization precision is remarkably improved; and a high-precision analysis technology is provided for anti-fatigue design, process optimization and service life evaluation of the engineering welding structure.

The invention discloses a hard alloy cutter life prediction and material selection method and system based on working condition parameters, and relates to the technical field of hard alloy cutter manufacturing, and the method comprises the steps: collecting cutting force distribution and temperature gradient data through a cutter tip area stress sensing array and a temperature sensing array, and constructing stress-temperature-wear synergistic effect data; calculating a fatigue damage characteristic value based on the synergistic effect data to obtain a wear prediction correction coefficient; compensating the tool nose stress field by using the correction coefficient, and outputting life prediction data; and designing a carbide phase gradient distribution structure according to the synergistic effect data and the fatigue damage characteristic value, adjusting a carbide grain orientation angle in combination with the wear prediction correction coefficient and the life prediction data, outputting optimal material structure parameters, and realizing optimal selection of the hard alloy cutter material. According to the method, the cutter service life prediction precision is improved, and the dynamic optimization of the material structure is realized.

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 grain-oriented electrical steel sheet includes a base steel sheet having a predetermined chemical composition, a glass coating provided on a surface of the base steel sheet, and a tension-applying insulation coating provided on a surface of the glass coating. The base steel sheet has a texture oriented in the Goss orientation. In the base steel sheet, when an average dispersion angle from an ideal Goss orientation with a rolled surface normal direction ND as the rotation axis is defined as α (°), an average dispersion angle from the ideal Goss orientation with an orthogonal-to-rolling direction TD as the rotation axis is defined as β (°), and an average dispersion angle from the ideal Goss orientation with a rolling direction RD as the rotation axis is defined as γ (°), α, β, and γ satisfy the following formula (1). 0.0≤β<2.5<α<4.0≤γ≤10.0

The application discloses a preparation method for regulating and controlling ferroelectric texture ceramic grain size by using a phase field method simulation technology, and comprises the following steps: preparing a series of microcrystalline powders with different size distributions; setting an initial phase field structure meeting the particle size distribution; establishing a phase field model for grain orientation growth; simulating and analoging the grain orientation growth process; preparing a film; preparing a green body with microcrystalline parallel distribution; and preparing ferroelectric texture ceramics with target grain size distribution. The application fully utilizes the computer simulation intelligent prediction guidance technology, does not need repeated trial and error experiments, saves time and effort, has good product reproducibility and stability, easily realizes accurate control of the ferroelectric texture ceramic grain size distribution, and is easy to be industrialized; the application effectively controls the occurrence of grain abnormal growth, maintains high grain orientation, and promotes the densification of the ceramic; and the application can not only prepare high-texture-density ferroelectric ceramics, but also regulate and control the grain size.

Method for producing a stacked grain-oriented sheet core (O) for a transformer from a sheet stack (W), clamping system (9) and apparatus (1); the method provides for preparing a sheet stack (W) comprising one or more sheets (P) made of grain-oriented electrical steel; said sheet stack (W) is grabbed by a clamping system (9); the sheet stack (W) is placed on an assembly table (7; 7I; 7II; 7III; 7IV); during the placing step, the sheet stack (W) falls in free fall along a path (tx1).

A method for determining grain orientation is used for identifying grain orientation in an image of a metallographic sample, the metallographic sample is a non-deformable alloy and is provided with a matrix and a second phase, and the second phase is provided with a habitual plane in the plane direction of the matrix {111} and is of a strip-shaped or disc-shaped structure. The method comprises the following steps: measuring an included angle between second phases in the same crystal grain on the surface of a metallographic sample, establishing a virtual regular tetrahedron of a matrix {111} plane, and calculating an angle relation between the surface of the metallographic sample and the matrix {111} plane according to the included angle between the second phases so as to determine the crystal grain orientation. According to the method, the grain orientation is calculated by utilizing the geometrical characteristics of the alloy structure, the method is simple, the requirement on the surface state of the sample is low, the characterization efficiency is effectively improved, and the test cost is reduced. The invention further provides a device for determining the grain orientation.

To provide a method for stably producing a grain-oriented electromagnetic steel sheet having low iron loss.SOLUTION: A method for producing a grain-oriented electromagnetic steel sheet comprises: hot rolling a steel slab to produce a hot-rolled sheet; after performing a first cold rolling and a first intermediate annealing without subjecting the hot-rolled sheet to hot band annealing, further performing cold rolling, as performed between the first cold rolling and the first intermediate annealing, twice or more to produce a cold-rolled sheet of final thickness; applying decarburization annealing that also serves as a primary recrystallization annealing to the cold-rolled sheet; and after that, performing a finish annealing to induce a secondary recrystallization. In the method, the rolling reduction ratio of the first cold rolling shall be 20% or more and less than 60%, and thereby, the area ratio of the crystal grains with a GAM value of 0.5 or less, observed by EBSD on a cross section perpendicular to the rolling direction of the steel sheet after the first intermediate annealing, shall be 80% or more. In addition, the ODF intensity of the {100}<011> orientation at the center of the sheet thickness of the steel sheet after decarburization annealing shall be more than 0.50 and not more than 1.5.SELECTED DRAWING: None

The invention provides a high-strength weak-texture Cu-Ni-Si alloy and a preparation method thereof.The preparation method comprises the following steps that a Cu-Ni-Si alloy block is sequentially subjected to first-stage cryogenic multidirectional forging, first aging treatment, second-stage cryogenic multidirectional forging and second aging treatment, and the high-strength weak-texture Cu-Ni-Si alloy is obtained. According to the scheme, a two-step cryogenic multidirectional forging and two-stage aging composite process is adopted, multidirectional twin variants are activated in the forging process, the twin crystal-dislocation interface density is improved, and high-density nucleation sites are provided for a precipitated phase; the two-stage aging promotes a precipitated phase to be uniformly dispersed and precipitated, grain refinement and precipitation strengthening collaboration are achieved, and the strength is remarkably improved while the high conductivity is kept; the multidirectional forging can also weaken the texture, randomize the grain orientation, eliminate the anisotropy, ensure the consistency of mechanical properties in all directions, reduce the cracking risk and prolong the fatigue life.

The application discloses a kind of grain map neural network's weld ultrasonic beam path correction method, it is related to the field of welding structure nondestructive testing, by obtaining the EBSD data of weld area, extract grain orientation, grain boundary type and spatial distribution characteristics, construct grain map structure, and calculate initial propagation time weight based on anisotropic sound velocity model;Using graph neural network to learn end to end for grain node and grain boundary edge features, output corrected edge propagation time weight;The time of flight from element to imaging pixel is obtained by shortest path search, and the time of flight predicted by neural network surrogate model is fused and corrected;Finally, the corrected time of flight is used to perform full focus imaging, and the weld defect image after optimizing the beam path is obtained.The method combines material microstructure characteristics and machine learning model, solves the problem that the beam path description is not fine enough in existing weld ultrasonic testing, significantly improves the accuracy and reliability of defect detection.

The present invention has as its object to provide grain-oriented electrical steel sheet further improved in core loss in control of magnetic domains by forming laser grooves in steel sheet after decarburization annealing and before finish annealing. The grain-oriented electrical steel sheet according to the present invention is a grain-oriented electrical steel sheet having a plurality of grooves on the surface of the steel sheet and provided with a glass coating on that surface, which grain-oriented electrical steel sheet characterized in that an absolute value of an angle θ formed by a direction perpendicular to both a rolling direction and sheet thickness direction of the steel sheet and a longitudinal direction of the grooves is 0 to 40°, a width W of the grooves is 20 to 300 µm, a depth D of the grooves is 10 to 40 µm, and a pitch P of the grooves in the rolling direction is 1.0 to 30 mm and in that the relationship of formula (1) is satisfied when a thickness of the glass coating of flat parts of the steel sheet surface (parts other than grooves) is t1 and the thickness of the glass coating at the deepest parts of the grooves is t2: t2 / t1<1.00

The invention discloses a wire rod for an adhesive tape steel wire and a production control method for grain orientation of the wire rod. The wire rod comprises the following chemical components in percentage by mass: 0.80%-0.86% of [C], 0.15%-0.35% of [Si], 0.40%-0.55% of [Mn], 0.0030%-0.012% of [P], 0.0040%-0.010% of [S], 0.0010%-0.0040% of [N], 0.0010%-0.0020% of total oxygen, 0.0010%-0.0035% of [Als], 0.00005%-0.0005% of [Ca], 0.00004%-0.0004% of [Se], 0.01%-0.05% of [Cr], less than or equal to 0.02% of [Ni] and the balance of Fe and inevitable impurities. According to the invention, systematic design is carried out from the aspects of chemical components, a smelting process and a rolling process, microalloying is carried out by adopting elements such as aluminum and selenium, the continuous casting process is operated at a constant pulling speed, and the content proportion of pearlite, proeutectoid ferrite and troostite structures of the wire rod is controlled, so that the large-angle grain boundary proportion of the wire rod is greater than 10%; and the metallographic structure requirement of a user on the wire rod for the adhesive tape steel wire is met.

The application discloses a method for eliminating lisdin grain defects on the surface of ferrite stainless steel cold plates, which comprises the following steps: optimizing continuous casting process, controlling the overheating degree of molten steel at 25-40 DEG C; controlling the electromagnetic stirring intensity as follows: current 1400-1600 A, frequency 3.0-4.0 Hz, and commutation time 10-20 s; controlling the wide surface intensity of crystallizer cooling water at 2600-2800 L / (min.m), controlling the narrow surface intensity of crystallizer cooling water at 2400-2700 L / (min.m), and controlling the cooling water intensity of the secondary cooling section at 1.10-1.30 L / kg; controlling the hot rolling temperature, controlling the rough rolling temperature at 1000-1100 DEG C, and controlling the final rolling temperature of the finishing rolling at 780-880 DEG C; for the cold plates with a thickness of less than 2.0 mm, controlling the total cold rolling deformation rate at more than 70%; and for the cold plates with a thickness of more than 2.0 mm, controlling the total cold rolling deformation rate at not less than 60%. According to the method, the equiaxed crystal ratio of the ferrite stainless steel continuous casting billet is increased to more than 55% by optimizing and controlling the continuous casting process parameters, and finally the grain orientation distribution on the surface of the cold plate is uniform, there is no obvious grain cluster, and the lisdin grain defects on the surface of the ferrite stainless steel cold plate are effectively eliminated by controlling the hot rolling temperature and the total cold rolling deformation rate.

The invention belongs to the technical field of heat-resistant steel life prediction, and discloses a heat-resistant steel life prediction method and system based on low-cycle fatigue crack evolution and fracture, and the method comprises the steps: collecting the original structure morphology of austenitic heat-resistant steel, and obtaining the average grain size and grain orientation characteristics; and calculating the maximum Schmidt factor and the minimum Schmidt factor of each crystal grain by traversing a crystal grain slippage system. Meanwhile, a dislocation slippage theory is taken as a core, a low-cycle fatigue test is combined, shear stress, friction stress, Poisson's ratio and a plastic strain range are introduced, a low-cycle fatigue slippage zone length c and a crack tip fatigue slippage length increment delta CTSD are calculated, elastic and plastic strain tensors and a fatigue hysteretic curve are fused, and a crack tip fatigue slippage zone length delta CTSD is calculated. The crack growth rate and the crack length change rule under different circulation cycles can be accurately obtained, and the prediction error of a general model is reduced. The prediction accuracy of the fracture life of the austenitic heat-resistant steel can be greatly improved, potential safety hazards and resource waste are reduced, and stable operation of equipment under the high-temperature working condition is guaranteed.

A kind of method for analyzing residual stress field of laser shot peening of aviation aluminum alloy containing texture, based on X-ray diffraction method, grain orientation information and laser shot peening finite element simulation result analysis residual stress, using chemical milling to strip layer, based on X-ray diffraction, grain orientation information and ABAQUS laser shot peening finite element simulation, the residual stress field generated by laser shot peening of 2024T351 aluminum alloy is analyzed, it is a complete method suitable for residual stress analysis of strong texture material, the method is aimed at the problem of layer-by-layer stripping of material, the anisotropy phenomenon caused by grain preferred orientation and the problem of poor data reliability, the method of analyzing residual stress by X-ray diffraction is optimized in details, including the combined application of chemical milling stripping layer, residual stress calculation considering grain orientation information and data screening.The present application makes the inner surface of chemical milling window flat by plane layer-by-layer stripping, which has a positive effect on improving the accuracy of residual stress test, and reliable stress data is obtained.

The invention discloses a multi-scale collaborative analysis method for a sintering microstructure of an MLCC ceramic body, and the method comprises the steps: cutting an MLCC ceramic sample, and carrying out the layer-by-layer scanning through FIB equipment, and obtaining three-dimensional image data; the grain orientation change is monitored through high-temperature EBSD equipment, and the form, size and distribution of grains are recorded; in combination with FIB-SEM and EBSD data, grain size, porosity and grain orientation are extracted, and a microstructure-performance relation model is established by utilizing regression analysis and a neural network; a deep Q network or deep reinforcement learning is adopted to optimize multi-scale model parameters, new data in the sintering process are adjusted in real time, the relation among microcosmic, mesoscopic and macroscopic scales is optimized, the optimization requirements of all scales are balanced through a multi-objective optimization method, and the macroscopic performance is improved.

The present application relates to a kind of preparation methods of post mould insert composite coating in the field of mould accessory manufacturing, comprising: extracting grain orientation and interface bonding state information from initial transition layer surface, using ion beam scanning technology to analyze grain distribution uniformity and interface stress, determine coating bonding force basic parameter;According to microdefect distribution data, the influence degree of defect on thermal fatigue resistance is analyzed by combining preset threshold range, and the real-time evaluation result of coating performance is obtained;Improved gradient composite coating is generated by optimized deposition process, and the change trend of microdefect is scanned again using online detection system, to determine the improvement range of coating durability and production efficiency;Key performance indicators are extracted from simulation results, combined with the data log of online detection system, process parameters are iteratively optimized by gradient descent algorithm, and the final stable coating preparation scheme is obtained.

A method for depositing copper onto a substrate includes grain engineering to control the internal structure of the copper. In some embodiments, the method comprises depositing a grain control layer conformally onto a copper seed layer in a structure on the substrate where the grain control layer is a non-conducting material, etching the grain control layer using a direct deep reactive ion etch (DRIE) process to remove portions of the grain control layer on horizontal surfaces within the structure, and depositing a copper material onto the structure such that at least one grain parameter of the copper material is controlled, at least in part, by a remaining portion of the grain control layer on vertical surfaces of the structure. In some embodiments, the deposited copper material in the structure has a <111> grain orientation normal to a horizontal surface of the structure.

A grain-oriented electrical steel sheet according to an embodiment of the present disclosure includes: an electrical steel sheet substrate; and an insulating film layer that is disposed on the electrical steel sheet substrate. At least one deformation portion having a linear shape is formed on a surface of the electrical steel sheet substrate, and a natural corrosion potential value of the electrical steel sheet is -350 mV or more.

The application belongs to the field of target material preparation, and particularly discloses a tantalum target material, a preparation method and application thereof. In the method, stress annealing, cold forging and heat treatment, two-stage rolling in different directions, intermediate static pressure treatment and recrystallization annealing are sequentially performed on a tantalum ingot, and each step is matched with each other, so that the tantalum target material has more uniform grain distribution, finer grains and a higher proportion of {111} grain orientation, thereby controlling the sputtering rate and sputtering stability, improving the uniformity of sputtering film and achieving the purpose of improving the film quality.

The application relates to the technical field of material performance evaluation, and provides a material strength and plasticity rapid nondestructive evaluation method based on EBSD data, which comprises the following steps: adopting an EBSD technology to characterize a material surface state, obtaining a backscattering diffraction pattern and obtaining original EBSD data and a grain orientation map of the material; based on the reconstructed grain orientation map, microstructure characteristic parameters of each grain in a target region of the sample are extracted respectively; based on the extracted microstructure characteristic parameters, a plasticity sensitivity coefficient of each grain is calculated; based on the slip distribution characteristics of the grains under the plasticity sensitivity coefficient, the target region of the sample is divided into a plasticity deformation dominant area and a strength dominant area, and partition visualization is realized through space mapping and different color filling; and based on the respective microstructure characteristic parameters of the areas, microstructure-mechanical property evaluation models are respectively established, so that the material strength and plasticity are rapidly evaluated.

Grain-oriented electrical steel sheet refined in magnetic domains by controlling a shape of grooves and positions of strained parts and the resultant stress to within certain ranges so as to further reduce the core loss, i.e., grain-oriented electrical steel sheet having a steel sheet surface on which grooves extending in a direction crossing a rolling direction (RD direction) and with a groove depth direction comprised of a sheet thickness direction (ND direction) are formed and having residual stress due to strain remaining in the vicinities of the grooves, in which grain-oriented electrical steel sheet, a pitch in the steel sheet rolling direction (RD direction) of the grooves is 2 to 10 mm, a depth of the grooves is 10 µm or more and 40 µm or less and a width of the grooves is 10 µm or more and 200 µm or less, in a range of within 10 µm from a wall surface of the groove (surface of the groove present at a depth of 25 to 75% of the depth of the groove) to the RD direction, a region in which 10 MPa or more residual stress is present due to compressive strain in the RD direction is 10 area% or more. in a range of within 10 µm from a bottom surface of the groove (surface of the groove present at a depth of 75 to 100% of the depth of the groove) to the ND direction, a region in which 10 MPa or more residual stress is present due to tensile strain in the RD direction is 10 area% or more.

To provide a copper plate suitable for laser processing and laser welding, by sufficiently improving a light absorption rate of a wavelength in an infrared region.SOLUTION: A Cu content is 99 mass% or more, the surface roughness Sdq (root mean square slope) is within the range of 0.05 to 0.50, and the surface roughness Sdr (developed interfacial area ratio) is within the range of 0.15% to 5.00%. In a cross-section perpendicular to the rolling width direction, the crystal grain size is 100 μm or less. The grain boundaries are classified as follows: those with an orientation difference of 2° to 15° between adjacent grains are low-angle grain boundaries; special grain boundaries (Σ3, 9, 27); and those with an orientation difference exceeding 15°(excluding special grain boundaries) are high-angle grain boundaries. The lengths of the low-angle grain boundaries (X), special grain boundaries (Y), and high-angle grain boundaries (Z) satisfy the condition (X+Z) / (X+Y+Z)>30%.SELECTED DRAWING: None

The application discloses a kind of grain boundary stress concentration factor calculation method, equipment, medium and program, method is applied to a grain boundary stress concentration factor calculation device, method includes: based on the grain size and grain orientation information of material, establish finite element model;The stress-strain curve of material is fitted by crystal plastic finite element model, and the critical starting stress value of deformation mode and hardening parameter of material at room temperature is determined;Based on finite element model, the critical starting stress value of deformation mode and hardening parameter, obtain the shear stress of each grain in finite element model on slip system or twinning system;Eshelby model is fitted based on the shear stress of different positions of grain boundary, and the grain boundary stress concentration factor is obtained.This application requires low, and the difficulty of calculation is low, can accurately calculate the stress concentration factor of each grain boundary of material, can quantitatively evaluate the ability of each grain boundary in material to hinder deformation transmission and crack initiation, provide criterion for material service performance evaluation.

The invention relates to a method for identifying the mechanical property of each composition phase of a multiphase material, which comprises the following steps: firstly, pretreating the surface of a material to be detected, obtaining grain orientation and grain boundary distribution through EBSD, selecting an indentation position in a target phase single grain, and implementing a nanoindentation experiment to obtain a load-displacement curve; then, scanning the three-dimensional morphology of the indentation through AFM, and extracting the depth of a feature point; establishing a single crystal three-dimensional nanoindentation CPFEM model, endowing crystal orientation measured by EBSD, and simulating to obtain a curve and morphology depth; fitting an experiment curve and a simulation curve by using a parabolic function to obtain a characteristic coefficient, and incorporating the characteristic coefficient and the morphology depth into a back analysis objective function; and finally, carrying out back analysis by adopting a global optimization algorithm to solve crystal plasticity parameters, and outputting a single crystal constitutive parameter set. Compared with the prior art, through curve and morphology double-information constraint and three-dimensional simulation, the deviation of a traditional method is overcome, the parameter identification precision and reliability are improved, and the method is suitable for multi-phase materials such as high-strength steel and titanium alloy.

Multi-layer metal or pseudometallic materials having engineered anisotropy are disclosed. The multi-layer materials having defined engineered grain orientations in each layer of the multi-layer material and bond layers between adjacent layers orthogonal to the grain orientations. This configuration distributes applied stress across the plurality of layers in the multi-layer metal material and around a neutral axis of the multi-layer metal material and increases the overall mechanical properties of the disclosed multi-layer metal material relative to conventional wrought metal materials of the same or similar chemical constitution. The microstructure of each layer, group of layers, or across multiple layers may be tailored to the intended application of a device made from the material. Individual layers may be tuned for property variations, such as gradients, or to adjust the bond layer characteristics. A method of making the multi-layer metal materials by physical vapor deposition to deposit each layer as crystalline grain structures and allow for layer-by-layer control over the physical, mechanical and chemical properties of each layer in the multi-layer metal as well as a bond layer between adjacent layers is disclosed.

The embodiments of this application relate to the field of computer materials science and technology, specifically to a method and system for determining the xenon bubble order parameters, grain orientation order parameters, and phase region order parameters of irradiated bubbles generated by metallic fuels under irradiation conditions, as well as a computer storage medium. The method includes: determining the solid-phase interface energy coefficient, gas-phase interface energy coefficient, and grain boundary energy coefficient based on the solid-solid interface energy, gas-solid interface energy, and grain boundary energy of U-Zr and U-Pu-Zr metallic fuels; determining the grain orientation order parameters and phase region order parameters based on the initial distribution of grains and phase regions during the irradiation process; and determining the xenon bubble order parameters based on the polycrystalline interaction energy density, solid-phase interface energy coefficient, gas-solid interface energy coefficient, grain boundary energy coefficient, grain orientation order parameters, and phase region order parameters. This method can intuitively reflect the influence of the microstructure of metallic fuels on the evolution of irradiated bubbles, realizing the simulation of the irradiated bubble evolution process at the mesoscale.

This invention provides a method for constructing a designable nanograin boundary network on the surface of metal powder, belonging to the fields of powder metallurgy and material surface engineering. The invention includes ultrasonic cavitation pretreatment to construct a high-defect nanoscale layer on the surface, external field-assisted annealing to control the surface grain boundary geometry, and cooling and post-treatment. By introducing a high-defect nanoscale layer on the powder surface and combining it with external field-assisted annealing to achieve selective recrystallization and grain orientation reconstruction, this invention obtains a nanograin boundary network structure with controllable grain boundary type, orientation, and curvature on the powder surface, thereby providing a stable and reproducible microstructural basis for improving powder surface properties.

The application relates to the technical field of material performance evaluation, and provides a material strength and plasticity rapid nondestructive evaluation method based on EBSD data, which comprises the following steps: adopting an EBSD technology to characterize a material surface state, obtaining a backscattering diffraction pattern and obtaining original EBSD data and a grain orientation map of the material; based on the reconstructed grain orientation map, microstructure characteristic parameters of each grain in a target region of the sample are extracted respectively; based on the extracted microstructure characteristic parameters, a plasticity sensitivity coefficient of each grain is calculated; based on the slip distribution characteristics of the grains under the plasticity sensitivity coefficient, the target region of the sample is divided into a plasticity deformation dominant area and a strength dominant area, and partition visualization is realized through space mapping and different color filling; and based on the respective microstructure characteristic parameters of the areas, microstructure-mechanical property evaluation models are respectively established, so that the material strength and plasticity are rapidly evaluated.