20 results about "Microstructure morphology" patented technology

The invention discloses a method for printing a two-dimensional structure of a thermosetting material with controllable surface roughness. The method comprises the following steps: regulating and controlling the rheological property of the extrusion behavior of the selected thermosetting material; calculating and determining the relationship between the deposition morphology of the thermosetting material and the printing parameters, and drawing an H-V phase diagram to determine a critical printing interval for realizing uniform deposition; establishing a single fiber deposition morphology evolution model and a multi-fiber fusion geometric evolution model, and providing a correlation corresponding relation for the fusion degree and the surface microscopic roughness of adjacent deposition fibers, so as to obtain a preset surface microstructure morphology; and according to the required surface roughness, the interface is cured and locked through thermocuring at different fusion stages, so that the thermoset material two-dimensional film with continuously adjustable roughness and a stable structure is obtained. According to the invention, two-dimensional structure printing of any thermosetting material system on any spreading substrate can be realized, and the surface roughness can be continuously and programmably adjusted.

The invention discloses a scheme for realizing strain sensor performance modulation based on laser-induced programming, and belongs to the technical field of flexible electronic device preparation. According to the method, different laser etching schemes are used according to the actual requirements of different application scenes, a substrate is induced to generate a specific microstructure morphology, and the thickness gradient of a surface metal film grown through subsequent chemical plating is influenced through the microstructure morphology. And finally, the stress distribution of the metal film in the stretching process is influenced by the thickness gradient to generate different crack morphologies, and the characteristic adjustment of the resistance change of the sensor is realized through the regulation and control of the crack morphologies. According to the scheme for realizing strain sensor performance modulation based on laser-induced programming provided by the invention, the effect of regulating and controlling the performance of the sensor as required is realized by using different laser etching modes and material proportions.

The invention relates to the field of nickel-based superalloy welding manufacturing, in particular to a nickel-based superalloy welding joint structure prediction method based on multi-scale simulation. The method aims at solving the key problems that nickel-based superalloy is poor in weldability, and joint structure simulation and prediction exist in the welding production and manufacturing process. The microstructure evolution process of the nickel-based high-temperature alloy welding joint is quantitatively calculated and analyzed by establishing a multi-scale nickel-based high-temperature alloy welding joint microstructure simulation model, so that the microstructure morphology prediction of the joint under different welding process parameter groups is realized. The multi-scale nickel-based superalloy welding joint structure simulation model is combined with actual welding process conditions, so that the grain morphology can be effectively improved, welding defects are reduced, the joint performance is improved, the service life of the joint is prolonged, and effective guidance can be provided for the welding process and product quality optimization of a nickel-based superalloy welding structure.

This invention discloses a method for printing two-dimensional structures of thermosetting materials with controllable surface roughness, comprising: controlling the rheological properties of the extrusion behavior of a selected thermosetting material; calculating and determining the relationship between the deposition morphology of the thermosetting material and printing parameters, and plotting an H-V phase diagram to determine the critical printing range for achieving uniform deposition; establishing a single-fiber deposition morphology evolution model and a multi-fiber fusion geometric evolution model to provide a correlation between the degree of fusion of adjacent deposited fibers and the surface micro-roughness, thereby obtaining a preset surface microstructure morphology; and, according to the required surface roughness, solidifying and locking the interface through thermal curing at different fusion stages to obtain a continuously adjustable and structurally stable two-dimensional film of thermosetting material. This invention can realize the printing of two-dimensional structures of any thermosetting material system on any spread substrate, and can continuously and programmably adjust the surface roughness.

This invention relates to the field of heat treatment technology for metallic materials, and discloses a method for controlling the microstructure and mechanical properties of welded thick titanium alloy plates. The method includes the following steps: providing a titanium alloy welded joint obtained by a narrow-gap welding method; performing stress-relieving annealing on the welded joint to obtain a primary part; and subjecting the primary part to a secondary annealing heat treatment in the two-phase region of the titanium alloy, the secondary annealing heat treatment comprising multiple cycles of heat treatment to eliminate acicular martensite in the fusion zone of the primary part and to equiax the acicular structure, thereby obtaining a finished part. This invention can effectively eliminate acicular martensite within coarse grains in the fusion zone of the welded joint, promoting the transformation of the acicular structure into a uniform and fine equiaxed structure, effectively improving its strength and plasticity, and significantly improving the microstructure morphology and mechanical properties of the fusion zone.

This invention relates to a superlens and its manufacturing method. The method includes: obtaining a wafer; the wafer comprising a substrate, a target layer on the substrate, a silicon nitride layer with openings in the target layer, and a hard mask material filling the openings; removing the silicon nitride layer by wet etching with an etchant under target heating conditions, the etchant being phosphoric acid with added bubble-generating agent, the bubble-generating agent decomposing to generate bubbles under the target heating conditions; and etching the target layer using the hard mask material as an etching mask to form multiple columnar microstructures. This invention adds a bubble-generating agent that decomposes upon heating to the phosphoric acid used for wet etching of the silicon nitride layer. The bubbles create turbulence in the etchant, promoting mass transfer and preventing the aggregation of silicate etching byproducts, effectively controlling the precipitation at the ends of the hard mask material, thereby obtaining a good columnar microstructure morphology.

The present application belongs to the technical field of numerical simulation of microstructure evolution in additive manufacturing process, and provides a method for predicting microstructure morphology of alloy solidification based on a phase field-lattice Boltzmann method multi-scale model.The present application introduces laser parameters and alloy parameters into a flow and heat transfer model of a macroscopic molten pool, extracts parameters of a local position in the macroscopic molten pool that needs to be simulated, substitutes the extracted parameters into a phase field-lattice Boltzmann model, obtains microstructure simulation data packets for visual processing, and obtains the microstructure morphology of alloy solidification.The method of the present application is a multi-scale method, is directed to additive manufacturing, and can more comprehensively establish a connection between process parameters and microstructure.Based on the phase field-lattice Boltzmann model, the influence of flow is considered in the process of microstructure growth, and the result is more accurate.The present application can effectively simulate the mechanism of the effect of the flow field on the dendrite front in the process of dendrite growth, and can simulate how the flow field affects the solute distribution at the dendrite tip.

The invention relates to a method for preparing a high-durability three-dimensional graphene-based nano coating heat transfer surface based on femtosecond laser direct writing, and belongs to the field of efficient heat transfer material preparation. The method comprises the following four steps: (1) grinding, polishing and cleaning the surface of metal copper; (2) preparing metal substrates with different microstructure morphologies by controlling femtosecond laser processing parameters; (3) preparing a graphene-based nano-coating distributed in a three-dimensional space on the surface of the microstructure by controlling boiling parameters of the nano-fluid; (4) the boiling surface of the prepared graphene oxide nano coating distributed in the three-dimensional space has excellent heat transfer characteristics, CHF reaches 236.9 Wcm <-2 >, the maximum HTC reaches 10.7 Wcm <-2 > K <-1 >, and the heat transfer performance of the surface of the graphene-based nano coating is further improved; and (5) the surface of the prepared graphene oxide nano coating distributed in the three-dimensional space has good stability and durability in an actual working environment. The boiling surface of the graphene-based coating prepared by the method has excellent characteristics, also has the characteristics of good stability and durability, simple preparation method, low cost and controllable three-dimensional space morphology, and has wide industrial application prospects.

A residual stress cross-scale analysis method for a laser additive manufacturing large-size component comprises the following steps that based on feature driving model shape simplification and large-size complex geometric component temperature and residual stress field analysis of a macroscopic thermal-mechanical coupling finite element, a three-dimensional component model is established, and a thermal-mechanical coupling finite element model is optimized; a double-ellipsoid laser heat source model is adopted, simulation calculation is conducted through a three-dimensional transient heat conduction equation, and evolution characteristics and distribution data of a temperature field and a residual stress field in the LP-DED process are obtained; and carrying out microscopic residual stress analysis based on the CP model of the coupled phase field damage PF model and the actual microstructure morphology representative volume element model RVE, and transplanting the obtained spatio-temporal evolution characteristics and distribution data of the macroscopic residual stress field to the mesoscopic CP model as predefined field variables through deep embedding coupling of the PF model and a CP constitutive framework. And establishing a cross-scale transmission analysis channel from the macroscopic stress field to the mesoscopic structure response so as to predict the multi-scale collaborative residual stress.

The invention discloses a method and system for evaluating the grain size of an invar alloy forge piece, and the method comprises the following steps: S1, designing heat treatment process parameters based on differential thermal analysis data of an invar alloy and a precipitated phase evolution rule obtained by a scanning electron microscope, and preparing invar alloy samples with different grain sizes; s2, detecting by an ultrasonic longitudinal wave vertical incidence method, and extracting a frequency domain characteristic value of an ultrasonic signal; s3, the microstructure morphology of the invar alloy sample is obtained, and a twin crystal feature recognition strategy is established in combination with the precipitated phase morphology; s4, obtaining an influence rule of microstructure change of the invar alloy sample in a tissue evolution process on the frequency domain characteristic value, and researching a mapping rule between an ultrasonic signal and a defect depth; and S5, constructing an ultrasonic time-frequency domain multi-feature fusion evaluation model for the grain size and the macroscopic defect of the invar alloy. The method solves the problem that an existing linear model with a single ultrasonic parameter is difficult to accurately characterize the grain size change of the invar alloy.

The invention discloses a double-phase titanium alloy and a preparation method and application thereof, and relates to the technical field of alloy materials. The double-phase titanium alloy provided by the invention is prepared from the following components in percentage by mass: 3.0 to 5.0 percent of aluminum, 3.0 to 4.0 percent of chromium, 3.0 to 6.0 percent of vanadium, 2.0 to 4.0 percent of molybdenum, 1.0 to 2.0 percent of tin, 3.0 to 6.0 percent of zirconium and the balance of titanium and inevitable impurities. According to the invention, the combined action of various elements is combined, the content of each element is controlled, and the microstructure form is precisely regulated and controlled, so that the double-phase titanium alloy with stress-induced phase change toughening characteristic and high strength and high work hardening capability is obtained, the work hardening and plastic deformation capabilities of the titanium alloy under high strength are effectively improved, and the working strength of the titanium alloy is improved. Meanwhile, the excellent characteristics of high strength, high plasticity and toughness, high work hardening capacity, low yield ratio and the like are achieved. The preparation method is simple and easy to implement, and subsequent treatment such as aging is not needed. The method has extremely high application value in the fields of aerospace, biomedical treatment and the like.

The invention relates to a tungsten-nickel-tantalum alloy microstructure morphology etchant and application thereof.The tungsten-nickel-tantalum alloy microstructure morphology etchant comprises water, aqua regia, hydrofluoric acid and sulfuric acid, aiming at the characteristics that tungsten-nickel-tantalum alloy is high in corrosion resistance and different in crystalline phase corrosion rate, through functional complementation and reaction balance of multiple components, the corrosion resistance of the tungsten-nickel-tantalum alloy is improved, and the corrosion resistance of the tungsten-nickel-tantalum alloy is improved. The method realizes rapid and accurate corrosion of the tungsten-nickel-tantalum alloy, clearly presents the microstructure morphology of the alloy, is suitable for detection of the alloying degree of the tungsten-nickel-tantalum alloy in the fields of aerospace, nuclear industry, medical treatment and the like, and provides reliable technical support for performance evaluation of such materials.

This invention provides a method for evaluating the α-lamella thickness and mechanical strength of TC4 ELI titanium alloy, which is of guiding significance for heat treatment-controlled microstructure and mechanical properties of TC4 ELI titanium alloy. The real-time heat treatment temperature-time-α-lamella thickness model constructed in this invention, and the revealed parameters of α-Ti lamellar coarsening rate and diffusion activation energy, can, on the one hand, predict the α-Ti lamellar thickness, solving the problem of precise control of the α-Ti lamellar microstructure size in titanium alloys and providing a reliable basis for heat treatment-controlled α-Ti lamellar microstructure size; on the other hand, it can evaluate the changes in the microstructure morphology of the α-Ti lamellar microstructure of titanium alloys at high temperatures, providing a new method for evaluating the mechanical properties of titanium alloys. Simultaneously, the α-lamella thickness-tensile yield strength model constructed in this invention can evaluate the mechanical strength of the alloy, providing a reliable basis for heat treatment-controlled mechanical properties of titanium alloys.

The invention provides an on-site metallographic grinding and polishing device and method for a pressure-bearing tanker. The on-site metallographic grinding and polishing device comprises a rotating magnetic base, the rotating magnetic base is rotationally provided with a supporting stand column, and the supporting stand column is slidably connected with a supporting base; the height adjusting mechanism comprises a first kidney-shaped hole formed in the supporting base, a first threaded hole formed in the supporting stand column and a first screw, and the first threaded hole and the first screw are formed in the supporting stand column. The grinding and polishing angle and position are accurately and stably adjusted and locked, the instability of manual operation is overcome, a uniform and flat grinding and polishing surface can be obtained in cooperation with elastic pressing and reciprocating motion of the reciprocating motion mechanism, artifacts such as scratches, trailing and overheating tissue damage are effectively avoided, and therefore it is ensured that the obtained microstructure morphology is real and clear, and the quality of the microstructure is improved. And a reliable guarantee is provided for accurately analyzing the welding seam quality, the crack property and the process rationality.

The invention relates to the technical field of precision machining, in particular to a vibration-assisted circumferential milling micro-structure controllable machining method which comprises the following steps: target setting: according to actual engineering requirements, setting target geometric characteristic parameters of a to-be-machined inclined groove micro-structure, including groove height Hv, width Wv and inclination angle gamma; reverse solving of process parameters: on the basis of a preset geometry-process mapping model and a constraint space, inputting target geometrical characteristic parameters by utilizing a microstructure morphology parameter reverse solving interface based on MATLAB GU I; designing and implementing a circumferential milling machining experiment of vibration in the vertical feeding direction; and on a vibration-assisted circumferential milling platform, machining is conducted according to the technological parameter combination, and the target-oriented microstructure is obtained. According to the method, automatic and accurate matching from the target morphology to the process parameters is realized by establishing the quantitative mapping relation between the geometrical characteristics of the microstructure and the process parameters and integrating the parameter reverse interface and the surface morphology simulation model based on MATLAB GU I.

The application discloses a kind of biomimetic radial lamella porous hydroxyapatite bone repair materials, including several axial stacking radial lamella and substructure inside radial lamella, radial lamella is made of several radially inward radiation extending lamellar structure unit, biomimetic porous hydroxyapatite bone repair material is the microstructure morphology with long-range order and radial symmetry;The application also discloses the preparation method of the biomimetic porous hydroxyapatite bone repair material.The biomimetic porous hydroxyapatite bone repair material is designed as the radial lamella of axial stacking, and substructure is designed inside radial lamella, can improve the material interaction efficiency between body fluid, primary bone tissue and implant material, and realize the anisotropy of mechanical property, strengthen bone repair effect, applicable to biological medical field.

The invention discloses a Pd-In synergistically modified MoO3 nano composite material, a preparation method and application, and relates to the technical field of gas sensitive materials and electrochemical devices, the nano composite material is prepared by performing hydrothermal reaction on a palladium source, an indium source and a molybdenum source, and then drying and calcining; the morphology of the nano composite material is a nano-rod composite structure with nano-particles grown in situ on the micron-sized surface; metal palladium and indium in the nano composite material are doped into MoO3 crystal lattices, and part of indium particles are agglomerated and grow on the surface of molybdenum oxide. According to the invention, breakthrough optimization of microstructure morphology and core gas-sensitive performance of a traditional hydrogen detection material is realized, and specific response capability and comprehensive gas-sensitive characteristic of a sensor to hydrogen in an actual application scene are greatly improved; finally, a brand new technical path with innovativeness, practicability and operability is provided for design and preparation of novel functional materials in the field of room temperature gas sensing.

The invention discloses a heat treatment process capable of meeting strong-plasticity combination of a TA15 / Ti60 gradient material for additive manufacturing, which comprises the following steps: manufacturing a TA15 / Ti60 double-titanium alloy gradient structure material by directional energy deposition (DED), combining a two-stage annealing process, heating to 850-990 DEG C at a speed of 10 DEG C / min in first-stage annealing, preserving heat for 0.5-1.0 h, and then air-cooling to room temperature; in the second-stage annealing, the temperature is increased to 650-750 DEG C at the speed of 10 DEG C / min, heat preservation is conducted for 1.5-2.0 h, then furnace cooling is conducted to 600 DEG C, and then air cooling is conducted According to the process, the strength and plasticity of the TA15 / Ti60 gradient material are balanced, and the mechanical property and microstructure of a stretching part are optimized; the high-temperature service capacity of the TA15 / Ti60 gradient material is improved, and the temperature of the TA15 / Ti60 gradient material reaches 600 DEG C or above; the problem that the microstructure of the TA15 / Ti60 gradient material is not uniform is solved, it is ensured that the alpha / beta two-phase proportion is proper, and the microstructure morphology is regulated and controlled.

The invention provides a method for improving the fatigue damage tolerance of a high-strength and high-modulus ceramic particle reinforced aluminum-based composite material. According to the method, the homogenized ceramic particle reinforced aluminum matrix composite ingot is subjected to forging cogging treatment, and meanwhile, the fatigue damage tolerance performance of the ceramic particle reinforced aluminum matrix composite can be improved by selecting the extrusion process and the cold deformation process; and then solid solution quenching treatment and artificial aging treatment are combined, so that the microstructure form with nano ceramic particles uniformly distributed in the ceramic particle reinforced aluminum-based composite material, an ideal precipitated phase and dislocation distribution can be obtained, and the ceramic particle reinforced aluminum-based composite material with high strength, high modulus and high fatigue damage tolerance performance is obtained.

The invention discloses a method for predicting the low-cycle fatigue life of a coated turbine blade based on equivalent stress, and the method comprises the steps: introducing an equivalent stress model according to the relation between stress and life in a fatigue limit formula, obtaining a fatigue life prediction model, and carrying out the prediction of the low-cycle fatigue life of the coated turbine blade based on the fatigue life prediction model. Degradation of fatigue life is innovatively attributed to increase of equivalent stress caused by microstructure changes, a fatigue life prediction model based on equivalent stress is finally established by referring to the stress-fatigue life relation in a Baquin model, and the direct relation between the fatigue life and interface microstructure morphological parameters and material attributes is established. Therefore, the model has higher physical significance and universality, and high-precision life prediction is realized.