6283 results about "Plastic property" patented technology

The invention discloses a steel wire rod for a 2300-2360 MPa grade stress corrosion resistant steel strand, the steel strand and a preparation method. The steel wire rod comprises the following chemical components in percentage by mass: 0.85-0.91% of C, 0.3-1.0% of Si, 0.2-0.8% of Mn, 0.15-0.45% of Cr, 0.02-0.05% of V, less than or equal to 0.008% of S, less than or equal to 0.010% of P, less than or equal to 0.004% of N, less than or equal to 0.0020% of O and the balance of Fe and other inevitable impurities. The steel wire rod has excellent strength and plasticity, the ultrahigh strength of 2300 MPa or above can be obtained through drawing with a small area reduction rate, surface damage and internal defects of the steel wire rod during subsequent drawing machining are reduced, and the stress corrosion index of the steel strand is improved.

The invention discloses a steel wire rod for a 2200-2260 MPa grade ultrahigh stress corrosion resistance prestressed steel strand, the steel strand and a production method of the steel strand, and the steel wire rod comprises the following alloy components in percentage by mass: 0.83-0.89% of C, 0.60-1.40% of Si, 0.20-0.80% of Mn, 0.15-0.50% of Cr, less than 0.30% of Cu, less than 0.30% of Ni, less than 0.30% of Mo, 0.01-0.05% of V, 0.001-0.05% of Nb, less than or equal to 0.008% of S, less than or equal to 0.010% of P, less than or equal to 0.0040% of N, less than or equal to 0.0020% of O and the balance of Fe and other inevitable impurities, through component design and a reasonable after-rolling controlled cooling process, the microstructure is refined, the sorbite rate is improved, high strength and plasticity are obtained with low carbon content, the drawing deformation can be reduced, material damage can be reduced, and the corrosion resistance of the steel strand is improved.

The invention relates to a hot-rolled wire rod for a 2100MPa-grade bridge cable and a manufacturing method of the hot-rolled wire rod, after the hot-rolled wire rod is formed by rolling high Si-Mn chemical components and spinning at the spinning temperature of more than or equal to 955 DEG C, the wire rod is cooled at the cooling speed of more than or equal to 36 DEG C / s through online molten salt sorbite regulation and control treatment, enters a sorbite phase region from an austenite state, promotes sorbite phase transformation and is subjected to isothermal treatment to remove stress; and finally, roller way slow cooling is conducted, the hot-rolled wire rod with the microscopic structure comprising tempered sorbite with the volume percentage larger than or equal to 95% and the balance being a mixed structure composed of ferrite and fused sorbite is prepared, deteriorated structures such as network carbide and martensite can be effectively controlled, wire rod structure regulation and control, strength and plasticity matching and stable production are achieved, and the effects that the tensile strength is 1500-1540 MPa, the tensile strength is high, and the tensile strength is high can be achieved. The composite material is used in the application fields of manufacturing of 2100MPa-grade ultrahigh-strength bridge cables and the like, and is beneficial to reduction of the risk of wire breakage.

The invention relates to a high-strength complex-phase hot-rolled wire rod for a 2200MPa-grade bridge cable and a manufacturing method of the high-strength complex-phase hot-rolled wire rod. After C-Si-Mn-Cr chemical components are rolled and spun into a wire rod, the wire rod is subjected to online molten salt critical quenching isothermal treatment, the wire rod is controlled to be subjected to front-section treatment and cooled at a cooling speed of greater than or equal to 38 DEG C / s, and enters a pearlite and martensite mixed phase region from an austenite state; the method comprises the following steps: firstly, carrying out heat treatment on austenite to promote transformation of part of austenite to sorbite and martensite, then carrying out post-treatment, reducing the circulation volume of molten salt, promoting transformation of austenite to pearlite, carrying out isothermal tempering, and finally carrying out roller way slow cooling, so as to prepare a hot-rolled wire rod of which the microstructure comprises a complex phase structure consisting of tempered pearlite, tempered sorbite, ferrite and tempered martensite, the composition system can be simplified, the deteriorated structure can be effectively controlled, complex-phase structure regulation and control and high-strength plastic performance matching are achieved, the tensile strength is 1568-1603 MPa, the percentage reduction of area is 29%-34%, and stable manufacturing of the bridge cable is facilitated.

The invention relates to a high-strength complex-phase hot-rolled wire rod for a 2100MPa bridge cable and a manufacturing method of the high-strength complex-phase hot-rolled wire rod, and the manufacturing method comprises the following steps: rolling and spinning C-Si-Mn-Cr-Mo chemical components into a wire rod, and carrying out online molten salt tail end quenching isothermal treatment, so that the wire rod firstly passes through front-section molten salt and is cooled at a cooling speed of more than or equal to 35 DEG C / s to enter a sorbite phase region from an austenite state; the method comprises the following steps of: controlling part of austenite to be converted into sorbite, cooling to a bainite phase through rear-section molten salt, carrying out end quenching, controlling bainite phase change, carrying out isothermal tempering to remove stress, and finally carrying out roller way slow cooling to prepare a complex-phase structure comprising tempered sorbite and tempered bainite, so that abnormal structures of network carbides and martensite can be effectively controlled; the high-strength composite phase structure control and plasticity matching are achieved, the tensile strength is 1530-1560 MPa, the percentage reduction of area is 30%-35%, and the method is suitable for manufacturing 2100 MPa-grade ultrahigh-strength bridge cables with large drawing amount and beneficial to reducing the risk of wire breakage.

The invention provides a macroscopic finite element simulation analysis method and device for a sealing element considering plastic deformation, and belongs to the field of sealing element design. The method comprises the following steps: acquiring an engineering stress-strain curve of a plastic material in a compression state; converting the engineering stress-strain curve into a real stress-strain curve; determining a yield limit, and taking a strain point corresponding to the yield limit as a demarcation point of elasticity and plastic deformation; an elastic section of a real stress-strain curve is extracted, the elastic modulus is calculated, and the Poisson's ratio is obtained through axial and transverse strain measurement in a uniaxial compression test; a true stress-strain curve plastic section is extracted, and a multi-linear isotropic hardening model is established; constructing a complete elastic-plastic constitutive model covering the elastic deformation area and the plastic deformation area; the stress distribution, the strain response and the contact performance of the plastic sealing element in a compression deformation state are simulated. According to the method and the device provided by the invention, the problem that the result does not conform to the reality due to the fact that only elastic modulus and Poisson's ratio are used in existing sealing element simulation can be solved.

The invention discloses a preparation method of a medical titanium-zirconium alloy bar wire. The preparation method comprises the processes of ingot casting, forging, quenching, hot rolling, quenching, cold rolling, recrystallization annealing, severe plastic deformation, drawing, straightening, annealing and surface treatment. The microstructure of the alloy is regulated and controlled by introducing high-density defects into the material through severe plastic deformation and combining quenching heat treatment, preparation of the titanium-zirconium alloy with high strength and plasticity and good fracture toughness is achieved, and equiaxial ultra-fine grain titanium-zirconium alloy bars and wires with the diameter ranging from 1 mm to 8 mm and the length larger than 600 mm can be produced in batches. High strength and high fatigue strength can be obtained, and the requirements of dental medical instruments for raw materials are met.

The invention relates to a hot-rolled wire rod for a 2060MPa-grade stranded wire and a manufacturing method of the hot-rolled wire rod. Mn-Cr high-carbon chemical component design and rolling spinning are performed to form a wire rod, then online molten salt isothermal phase change treatment is performed, the wire rod is firstly subjected to front-section molten salt treatment and enters a sorbite phase region from an austenite state to form a structure taking a sorbite structure as a main structure, and then the wire rod is subjected to rear-section molten salt treatment, so that the hot-rolled wire rod is obtained. The method comprises the following steps of: firstly, carrying out heat treatment on the residual austenite, promoting the unconverted residual austenite to be converted into a sorbite structure, simultaneously promoting isothermal tempering of the structure and fusing of a part of sorbite lamellas, and finally, slowly cooling through a roller way to prepare a hot-rolled wire rod of which a microscopic structure comprises a mixed structure consisting of tempered sorbite, tempered ferrite and fused sorbite, so that the material cost can be controlled; the high-strength and high-plasticity performance matching of the wire rod is improved, the tensile strength is 1370-1420 MPa, the percentage reduction of area is 35%-40%, and the mechanical property fluctuation is reduced, so that the wire breaking risk in stranded wire production is reduced, and efficient and stable production is promoted.

The invention provides a preparation method of an isotropic Ti2AlNb / TiAl-based interpenetrating composite material, and belongs to the technical field of intermetallic compound-based composite materials. The method comprises the following steps: firstly, designing a Ti2AlNb reinforcement framework of various TPMS configurations by utilizing implicit function modeling; then, carrying out anisotropy research on the TPMS configuration by utilizing finite element simulation; secondly, a Ti2AlNb reinforcement framework of a TPMS configuration is prepared through a selective laser melting (SLM) technology; and finally, the TPMS configuration Ti2AlNb / TiAl-based interpenetrating composite material is prepared through vacuum hot pressing sintering of HPS. Therefore, strong anisotropy of a traditional fiber reinforced composite material in mechanical property is avoided, good matching of strength, plasticity and toughness of the composite material is achieved, and a new thought and a new solution are provided for breaking through the application bottleneck of TiAl in spaceflight power system hot end components.

The invention relates to the technical field of metal plastic processing, and provides an integrated digital twinning large-specification bar rolling dynamic deformation distribution optimization method which comprises the following steps: constructing a digital twinning model in a large-specification bar rolling process; equipment state data, material parameters and process parameters in the rolling process are collected in real time, and the digital twin model is synchronously updated; based on the digital twinborn model, predicting strain field distribution, temperature field distribution, material metallographic structure performance and potential defect risk of the rolled piece in the current pass; with the minimum total rolling energy consumption, the highest size precision and the optimal structure uniformity as multiple objectives, deformation distribution parameters of subsequent passes are dynamically distributed through a hybrid optimization algorithm; and the optimized deformation distribution parameters are issued to a rolling mill control system to be executed, and model parameters are corrected based on online detection data feedback. In this way, the problems that in traditional rolling, due to strong experience dependence and poor dynamic working condition adaptability, efficiency is low, and many defects exist are solved.

The invention discloses a 340MPa grade P-containing hot-dip galvanized iron alloy high-strength IF steel, the chemical composition of which is as follows by weight: C: ≤0.003%, Si: ≤0.03%, Mn: 0.35-0.65%, P: 0.03-0.075%, S≤0.010%, Als: 0.020-0.045%, Nb: 0.008-0.015%, Ti: 0.02-0.03%, B: 0.0004-0.0010%, N≤0.0035%, and the remainder is Fe and unavoidable impurities; The elements also meet the following restrictions: calculated according to the corresponding weight percentage of each element, 10C+3N+2S≤Ti+2Nb≤12C+3N+2S, 60B≤P≤80B; the present invention adds P element to IF steel, and through composition and process optimization control, obtains a P-containing hot-dip galvanized iron alloy high-strength IF steel with a yield strength of 180-320 MPa, a tensile strength of 340-440 MPa, an elongation of 35-46%, a value (average plastic strain ratio) ≥1.8, high surface quality, high formability, and good cold brittleness.

The invention relates to a high-strength complex-phase hot-rolled wire rod for a 1960MPa-grade bridge cable and a manufacturing method of the high-strength complex-phase hot-rolled wire rod. V-containing hypereutectoid chemical components are rolled and spun into a wire rod, and then the wire rod is subjected to online molten salt rapid quenching treatment, so that the wire rod passes through front-section molten salt and is cooled at a cooling speed of greater than or equal to 37 DEG C / s, and enters a sorbite phase region from an austenite state; the method comprises the following steps: carrying out molten salt cooling isothermal treatment on austenite to promote transformation of part of austenite to sorbite, then carrying out rear-section molten salt cooling isothermal treatment to promote bainite phase change and isothermal tempering, and finally carrying out roller way slow cooling to prepare a hot-rolled wire rod of which the microstructure comprises a complex-phase structure consisting of tempered bainite and tempered sorbite, according to the steel wire rod, the plasticity of the steel wire rod can be considered, the strength and the structure uniformity of the steel wire rod are further improved, the tensile strength is 1420-1470 MPa, the percentage reduction of area is 39%-44%, the production rhythm is improved, and the steel wire rod is suitable for manufacturing 1960 MPa bridge cables and is beneficial to improving the wire breaking risk and the current situation of unqualified torsion in the wire drawing process.

The invention relates to the technical field of alloy steel, and particularly discloses high-strength and high-plasticity 3GPa-grade maraging steel and a preparation method thereof. The invention discloses high-strength and high-plasticity 3GPa-grade maraging steel, which is prepared from the following elements in percentage by weight: 15 to 20 percent of Ni, 0.1 to 2 percent of Al, 3 to 7 percent of Mo, 1.0 to 2.0 percent of Ti, 12 to 16 percent of Co and the balance of Fe and inevitable impurities. According to the maraging type ultrahigh-strength steel, by reasonably adding the elements and the proportion thereof and combining the forging process that the forging ratio and the forging temperature are reasonably adjusted and controlled, the maraging type ultrahigh-strength steel with the tensile strength of 3 GPa or above and the excellent plasticity is obtained.

The invention provides low-temperature rolled high-quality free-cutting steel and a production process thereof. The low-temperature rolled high-quality free-cutting steel comprises the following components: less than or equal to 0.10% of C, less than or equal to 0.006% of Si, 0.90-1.60% of Mn, 0.30-0.90% of P, 0.30-0.50% of S, less than or equal to 0.030% of Al, less than or equal to 0.0060% of N, less than or equal to 0.0140% of O and the balance of Fe and other inevitable impurities. Compared with the prior art, by controlling Mn / S to be 3.5-7.0, when the K value is equal to 2 * (Mn / S) + LF activity oxygen value, and K is larger than or equal to 35 and smaller than or equal to 69, the final sulfide is properly controlled. Low-temperature rolling is adopted, the sulfide hot brittleness interval is avoided, the plasticity of sulfide is relatively poor during rolling in the temperature interval, energy consumption is reduced, and meanwhile the phenomenon that the cutting performance of a finished product becomes poor due to the fact that the sulfide is lengthened in the rolling process is avoided. Finally, the high-quality free-cutting steel production process adopting low-temperature rolling is developed.

The invention belongs to but is not limited to the technical field of aluminum alloy preparation, and discloses a high-plasticity aluminum alloy prepared from secondary aluminum and a preparation method, high-quality secondary aluminum waste is selected, and obvious impurities are removed; carrying out chemical or mechanical cleaning on the secondary aluminum, and sorting; the pretreated secondary aluminum waste is added into a smelting furnace to be smelted; a purifying agent is added for melt purification; the melt is further purified through inert gas stirring and standing; adding a proper amount of alloy elements into the melt; under the protection of inert gas, uniformly stirring the melt; casting the melt into a cast ingot by adopting a semi-continuous casting or continuous casting process; controlling the cooling speed; carrying out homogenizing heat treatment on the cast ingot to eliminate composition segregation in the cast ingot; and extruding and rolling to obtain the high-plasticity aluminum alloy material. According to the method, the purity of the aluminum alloy is improved, the performance uniformity is enhanced, and the aluminum alloy material with high plasticity and excellent mechanical performance is obtained and is suitable for industrial application with high requirements.

The invention relates to a 1200MPa-grade high-strength tool steel wire rod and a manufacturing method thereof, after V-containing chemical components are designed, rolled and spun into a wire rod, the wire rod is subjected to online molten salt isothermal quenching treatment, and the wire rod is controlled to enter a bainite phase region from a high-temperature austenite state at a cooling speed greater than or equal to 32 DEG C / s; the steel wire rod with a microscopic structure comprising tempered bainite and ferrite is prepared through isothermal tempering, toughening and destressing treatment, carbide precipitation control and roller way cover opening and slow cooling, so that generation of deteriorated structures such as martensite can be avoided, the structure state can be effectively adjusted, strong plasticity matching of the steel wire rod is achieved, and the service life of the steel wire rod is prolonged. And the tensile strength is 1120-110MPa, the percentage reduction of area is 63-67%, and the steel is suitable for the application fields of manufacturing 1200MPa-grade high-strength tool steel and the like, and is favorable for being directly processed into tool parts after being subjected to cold processing molding.

The invention provides an aluminum alloy extrusion prediction optimization method based on machine learning and a related device, and relates to the field of material plastic processing. According to the method, electronic equipment obtains a simulation model of the aluminum alloy extrusion process, and the simulation model can simulate the maximum extrusion stress and the outlet temperature of aluminum alloy through input simulation process parameters; generating a plurality of pieces of simulation data through the simulation model; and carrying out model training by utilizing the multiple pieces of simulation data to obtain a trained aluminum alloy extrusion model. In this way, a large amount of simulation data is generated through the finite element model and used for training the aluminum alloy extrusion model. According to the aluminum alloy extrusion model, the maximum extrusion stress and the outlet temperature of the aluminum alloy can be predicted according to the input design process parameters, so that a guidance basis is provided for actual extrusion production, and a production plan can be quickly adjusted.

The invention relates to a 1100MPa-grade high-strength tool steel wire rod and a manufacturing method thereof, the wire rod adopts a middle-carbon Nb-V-containing chemical component design, after a steel billet is rolled and spun into the wire rod according to the spinning temperature of more than or equal to 860 DEG C, online molten salt semi-quenching isothermal treatment is performed, the wire rod is controlled to be subjected to front-section molten salt treatment, and then the steel wire rod is subjected to hot rolling and hot rolling to obtain the 1100MPa-grade high-strength tool steel wire rod. According to the method, the steel wire rod enters a bainite phase region from a high-temperature austenite state at the cooling speed of more than or equal to 30 DEG C / s to form a structure taking quenched bainite as a main component, and then is subjected to rear-section molten salt heating isothermal tempering and toughening destressing treatment, and finally is subjected to roller way slow cooling to prepare the steel wire rod with a microscopic structure comprising tempered bainite and ferrite, so that the material cost can be reduced, and the production efficiency is improved. The method has the advantages that martensite brittle structures are effectively avoided, the structure state of the hot-rolled wire rod is controlled, the plasticity and cold working performance of the wire rod are improved, the tensile strength of the product can reach 980-1030 MPa, the percentage reduction of area is 61%-66%, and the product can be directly machined into tool parts after cold forming.

The invention discloses preheating-free welding maritime work steel with excellent low-temperature toughness and a preparation method of the preheating-free welding maritime work steel, and belongs to the field of steel and iron material preparation. The produced steel plate has good comprehensive mechanical properties through alloy component-secondary rolling-controlled cooling process coupling design, the problem that the strength, plasticity, low-temperature toughness and preheating-free post-welding performance of the steel plate are difficult to match and harmonize is solved, the steel plate has ultrahigh-strength plasticity, excellent low-temperature toughness and excellent Z-direction performance, and room-temperature preheating-free welding can be achieved.

The invention provides a modified coal gangue-based large-flow-state grouting and water plugging material and a preparation method thereof. Comprising 80-90 parts of a coal gangue sample, 1-5 parts of Portland cement, 1-5 parts of sulphoaluminate cement, 0.51-3 parts of a polycarboxylic acid water reducing agent, 1-4 parts of cellulose ether with the viscosity of 200w, 0.1-5 parts of a calcium oxide expanding agent, 0.5-5 parts of a plastic expanding agent, 0.5-1 part of redispersible latex powder, 0.5-5 parts of polyacrylamide with the molecular weight of 1000 and water, and the water-material ratio is 0.4. According to the modified coal gangue-based large-flow-state grouting and water plugging material and the preparation method thereof, the cement consumption can be remarkably reduced, the cost is reduced, the utilization rate of solid wastes (such as coal gangue) is increased, and the material has good flow-state performance and adjustable setting time; the method is suitable for deep and large shaft surrounding rock water seepage treatment in coal mining and other mine engineering.

The invention discloses a forging method for improving plasticity of a large invar alloy steel ingot and invar alloy, and the forging method comprises the following steps: smelting molten steel by adopting an electric furnace, and casting to obtain the large invar alloy steel ingot with the weight of 15-25t; the cold-state invar alloy steel ingot is heated to 1000-1200 DEG C for heat preservation, and the heat preservation time is controlled to be longer than or equal to 10 h; the heated invar alloy steel ingot is subjected to three-heating-number upsetting and drawing-out, upsetting is conducted according to the rolling reduction of 15-50% of the total height of the invar alloy steel ingot in each heating number, the invar alloy steel ingot is drawn out to the height of the original invar alloy steel ingot after upsetting, and the invar alloy steel ingot is returned to a heating furnace to be heated and subjected to heat preservation after upsetting and drawing-out in each heating number; the final forging temperature of the last heating number is greater than or equal to 750 DEG C; and the invar alloy steel ingot subjected to heating and heat preservation in the last heating number is forged to the specified size, and then the invar alloy steel ingot is slowly cooled to the room temperature in air to obtain an invar alloy steel forging stock. The thermoplasticity of the large invar alloy steel ingot is improved, and the technical problem that the large invar alloy steel ingot is prone to cracking during forging is solved.

The dryer comprises a dryer shell, an inner cavity of the dryer shell is divided into a drying agent cavity and a heating module wiring cavity which are independent of each other through an end face structure, a heating module barrel sleeve is arranged on the end face structure in a penetrating mode, and the two ends of the heating module barrel sleeve stretch into the two independent cavities respectively. Two air tap connectors communicated with the drying agent cavity are arranged on the outer wall of the dryer shell at intervals, a drying agent drying assembly is arranged between the outer wall, located between the two air tap connectors, of the heating module barrel sleeve and the inner wall of the dryer shell, and a heating body assembly is arranged in the heating module barrel sleeve. A connector assembly is arranged on the outer wall of the dryer shell and used for being connected with an external power source, and the heating body assembly is electrically connected with the connector assembly. According to the invention, related connector design is simplified, product cost is reduced, airtightness failure caused by structural deformation after long-term work of the plastic assembly is avoided, high-efficiency and low-loss heating control can be realized, and system arrangement is more flexible.

The invention discloses a spinning forming method for a large-length-diameter-ratio variable-wall-thickness complex curved generatrix shell, and belongs to the technical field of metal pipe plastic machining. The specific process comprises the operation processes of blank size determination, primary machining, fixture and spinning roller determination, spinning forming, heat treatment and the like, the outer contour of a middle straight section is clamped, and then the two ends are subjected to hole shrinkage and thickening spinning. Through the machining mode that the two ends of the pipe are closed and subjected to die-free spinning, the defects and difficulties of common forging, extrusion and welding combined forming at present are overcome, the forming efficiency is improved, materials are saved, and the material utilization rate is high. Meanwhile, due to the fact that welding treatment is not conducted, heat treatment process operation is conducted finally, and the comprehensive mechanical property of a final finished product is more stable. The method is suitable for forming operation of various large-length-diameter-ratio variable-wall-thickness complex curved generatrix shells, and a reliable forming method can be provided for shell forming of spaceflight, weapons and the like.

The invention discloses a static-disturbance viscoelastic plastic damage unified model construction method under true three-dimensional stress, which comprises the following steps: S1, carrying out a true triaxial static compression test to obtain a strength rule; s2, carrying out a true triaxial disturbance test, and researching a rock disturbance deformation evolution rule; s3, introducing a three-dimensional strength criterion, establishing a plastic yield function, and constructing an elastic-plastic constitutive equation; s4, considering a rock disturbance degradation effect, and constructing a viscoelastic constitutive equation; s5, integrating and constructing a static force-disturbance viscoelastic plastic damage unified model, and establishing a model numeralization method; s6, simulating a static test, verifying the elastic-plastic constitutive equation, and fitting to obtain ductility-brittleness conversion formula parameters; s7, simulating a disturbance test, and verifying the viscoplastic constitutive equation; and S8, sorting model parameters, further carrying out numerical simulation, and checking the prediction effect of the model. The method provides a theoretical basis for mechanical behavior prediction and stability analysis of high-stress deep engineering surrounding rock, and has important engineering application value.

The cold heading wire rod comprises the following components in percentage by mass: 0.20%-0.26% of C, less than or equal to 0.35% of Si, 1.2%-1.6% of Mn, less than or equal to 0.02% of P, less than or equal to 0.005% of S, 0.04%-0.14% of V, 0.02%-0.10% of Nb, less than or equal to 0.2% of Cr, less than or equal to 0.1% of Ni, 0.02%-0.06% of Al and the balance of Fe and inevitable impurities, the V + Nb is greater than or equal to 0.09%, the C / 4 + Si + Mn / 2 + Cr / 2 + 2Ni is greater than or equal to 1.1% and less than or equal to 1.3%, the F + P is greater than or equal to 95%, the F grain size is greater than or equal to grade 12, the longitudinal pearlite strip The steel plate prepared by the method does not crack at 1 / 5 of a hot rolling state, can meet the requirements of a user on strength and plasticity of cold heading forming after 5-50% of cold drawing deformation, and can meet the requirements of a 10.9-grade high-strength fastener on fatigue and delayed fracture resistance at the same time.

The invention discloses a fluid-solid coupling analysis method, system and model for cross-scale evolution of an ocean structure. The method comprises the following steps: establishing a numerical wave water tank; establishing a plurality of reinforcement layer material RVE models, obtaining a macroscopic mechanical property curve of the reinforcement layer material, and obtaining a corresponding stress-strain constitutive relationship; based on the stress-strain constitutive relation, a reinforcing layer component model of the laminated structure is established, a light deformable layer component model of the laminated structure is established, and the reinforcing layer component model and the light deformable layer component model are assembled to obtain an overall laminated floating structure; and S100, merging the laminated floating structure into the numerical wave water tank in the step S100, carrying out fluid-solid coupling numerical simulation under the action of waves, judging the working condition of plastic deformation of the floating structure according to a result, and obtaining a plastic damage area and an elastic-plastic evolution response of the laminated floating structure. According to the method, the water elastic-plastic response of the large floating structure under the action of waves can be solved and optimized.

The invention relates to the technical field of equipment control optimization, in particular to an intelligent factory equipment energy efficiency optimization system which comprises the following steps: acquiring wall thickness distribution data of a steel pipe, local residual stress and a temperature gradient field in a straightening process; and a preset plastic mechanical model is used for calculating the actual yield strength and the theoretical straightening energy threshold value of each section of the steel pipe, so that a straightening parameter set of the steel pipe straightening machine is generated. And further correcting the straightening parameter set according to the temperature gradient field so as to optimize and eliminate energy consumption. A steel pipe straightening area is divided, a heat sensitive area and a low-temperature hardening area are identified, correction weights are distributed according to the area difference of the areas, then a corrected straightening parameter set is generated, and the straightening process of the steel pipe is optimized.

The invention discloses an intelligent control method and system for metal forging equipment, relates to the technical field of metal forging, and aims at monitoring the flowing state and the internal flowing resistance of a plastic blank in real time in the pressure applying process, so that an operator can adjust forging parameters in time, and the phenomenon of insufficient flowing or excessive flowing is further avoided. On the basis of the heat flow density and the pressure change data in the mold, the full-cavity evaluation coefficient Mgz is calculated in combination with the prediction model, so that whether the plastic blank fills the whole mold cavity or not can be accurately judged, experience judgment in a traditional method is further avoided, and the scientificity of evaluation is improved. By performing laser scanning and difference coefficient calculation on the surface of the formed metal forge piece, surface defects such as oxide skin and the like can be effectively identified and treated, so that the surface smoothness and the mechanical property of the forge piece are improved. And continuously performing process optimization according to the surface difference coefficient Bcxs to form a closed-loop feedback mechanism.

The invention is applicable to the technical field of titanium alloy pipe processing, and particularly relates to a preparation method of a high-plasticity TA15 titanium alloy pipe, which comprises the following steps: step S1, selecting sponge titanium, pure metal and intermediate alloy, preparing according to standard components of TA15 titanium alloy to obtain a prepared raw material, and smelting the prepared raw material for three times by adopting a vacuum consumable smelting furnace to obtain a high-plasticity TA15 titanium alloy pipe; and the TA15 titanium alloy cast ingot with the diameter being 600 mm is obtained. According to the method, the mechanical property and plasticity of the titanium alloy pipe are remarkably improved by accurately controlling the temperature and deformation of each machining step. And three-time upsetting and three-time drawing forging is carried out within the temperature range of T beta or above, coarse grains are effectively crushed, and grain structures are refined. And then, the metallographic structure of the wool rod is gradually optimized by accurately controlling the forging temperature and the deformation amount.

The invention discloses a metal material fatigue life prediction method and device considering non-uniform grain size distribution, equipment, a medium and a product, and relates to the field of material fatigue life finite element numerical calculation. The method comprises the following steps: acquiring material parameters of a metal material; determining a crystal plastic constitutive model; determining a parameter group based on the crystal plasticity constitutive model; constructing a microstructure model to be tested; based on the microstructure model to be tested, according to the crystal plasticity constitutive model and the parameter group, applying a set loading condition and a set boundary condition, and determining material fatigue data; determining the fatigue crack initiation life according to the fatigue indication factor and the material fatigue data; according to the fatigue crack propagation curve, determining the fatigue crack propagation life by adopting a fitting mode; and determining the fatigue full life according to the fatigue crack initiation life and the fatigue crack propagation life. The method can improve the accuracy of determining the fatigue life of the metal material.