23 results about "Interstitial element" patented technology

The invention discloses a Fe-Mn-C alloy interstitial atom potential function construction method based on a first principle and machine learning, and belongs to the technical field of material science and computational simulation. The construction method comprises the following steps: firstly, constructing a Fe-Mn-C alloy interstitial element atomic structure model, carrying out structure optimization on the interstitial element atomic structure model by utilizing a first principle, then carrying out first principle molecular dynamics (AIMD) multi-temperature sampling on the model after the structure optimization, and dividing a training set and a verification set; and finally, machine learning is conducted, and the Fe-Mn-C alloy gap potential function is output. According to the construction method, unification of high precision and high efficiency of the potential function is achieved, and the obtained Fe-Mn-C alloy gap potential function can be applied to research of a face-centered cubic (FCC) Fe-Mn-C alloy.

The invention discloses an in-situ composite titanium carbide reinforced titanium-based alloy and a preparation method thereof. The in-situ composite titanium carbide reinforced titanium-based alloy comprises the following chemical components in percentage by mass: 0 < = N < = 0.010%, 0 < = H < = 0.015%, 0 < = O < = 0.2%, 0.10-0.40% of C and the balance of Ti and inevitable impurities. The preparation method comprises the following steps: mixing the titanium powder and the graphite powder, and carrying out metal laser powder bed fusion printing. According to the invention, through in-situ synthesis of nano TiC particles, the size and morphology of the TiC particles are regulated and controlled, so that the mechanical property of the titanium-based alloy is greatly improved. The titanium-based alloy with high strength and excellent elongation is obtained by using a trace interstitial element C, and is independent of solid solution strengthening, second-phase dispersion strengthening or work hardening ways of expensive rare metals such as V, Mo, Nb and the like, so that green and low-cost preparation of the titanium alloy is facilitated.

Interstitial uptake of a metal alloy is leveraged to either stabilize low-temperature miscibility gaps or promote new miscibility gaps with respect to the interstitial elements at temperatures above the native metal interstitial-free alloy miscibility gap. The miscibility gap pathway offers selective precipitation at the surface while maintaining base alloy properties throughout the bulk of an article or component. Interstitially-induced separated phases offer even higher control over the interdiffusion between the metal alloy and a coating, which will expand the number of compatible coatings for a given alloy, increasing the potential performance of the alloy in harsh environments.

The invention belongs to the technical field of titanium alloy material and bar machining, and particularly relates to a high-ductility and low-toughness titanium alloy and a bar preparation method thereof. Raw materials are mixed, pressed, assembled and welded into a consumable electrode, and the bar is obtained through smelting, forging and heat treatment. The content of interstitial elements in the alloy is reduced through component optimization and cooperative process control of preparation, the impact energy of the prepared high-plasticity-toughness low-interstitial titanium alloy bar is larger than or equal to 60 J, the fracture toughness is larger than or equal to 115 MPa.m < 1 / 2 >, and under the condition of the 103s <-1 >-level strain rate, the dynamic flow stress is larger than or equal to 1580 MPa, the dynamic plastic strain is larger than or equal to 0.33, and the dynamic impact absorption energy is larger than or equal to 520 J / cm < 3 >; the tensile strength is greater than or equal to 850MPa at 500 DEG C, and the dynamic flow stress is greater than or equal to 1260MPa, the dynamic plastic strain is greater than or equal to 0.46 and the dynamic impact absorption energy is greater than or equal to 579J / cm < 3 > under the conditions of 500 DEG C and 103s <-1 >-grade strain rate.

The invention provides a nickel-titanium memory alloy ultra-low gap cast ingot and a composite smelting method thereof, and belongs to the technical field of titanium alloy metal processing. According to the composite smelting method for the nickel-titanium memory alloy ultra-low gap cast ingot, electrolytic nickel and sponge titanium meeting certain standards are adopted as raw materials, vacuum induction magnetic levitation smelting twice and vacuum consumable electrode arc smelting once are carried out after vacuumizing and argon introduction, so that the uniformity of components is guaranteed, the depth of a riser is controlled, and the alloy ingot is obtained. The content of impurity elements such as carbon and oxygen in the prepared nickel-titanium memory alloy ultra-low gap cast ingot is obviously reduced; the interstitial element chemical components of the cast ingot prepared by the method disclosed by the invention are far lower than the ASTM F2063-18 standard and the GB / T 24627-2023 standard. The composite smelting method provided by the invention realizes the control of ultralow interstitial elements in the cast ingot, and can be used for preparing the nickel-titanium memory alloy human body implant.

The invention belongs to the technical field of non-ferrous metal processing, and particularly relates to a method for reducing impurity elements in a titanium alloy cast ingot. According to the method, the titanium alloy cast ingot with low impurity element content is successfully prepared through effective control of an internal source and an external source; aiming at exogenous impurity elements, by reducing the exposure time of existing entities with large specific surface areas such as raw materials, electrode blocks and primary electrodes in the working procedure and the environment, by drying the primary electrodes and non-finished ingots, and by controlling the vacuum conditions of the materials in high-activity states such as welding and smelting, the high-purity silicon carbide is obtained. Impurity elements are promoted to introduce volatilization of related substances, and the content of uncontrolled intake impurity elements in the preparation process of the titanium alloy cast ingot is reduced; for endogenous impurity elements, sponge titanium and intermediate alloy with low impurity element content need to be selected as raw materials, the sponge titanium is strictly selected before being used, and the intermediate ingot is subjected to scaling treatment, so that the content of interstitial elements in the titanium alloy ingot is reduced from the source.

The invention belongs to the technical field of metal material preparation, and particularly relates to a machine learning-based additive manufacturing interstitial element reinforced titanium alloy design method, which comprises the following steps of: constructing a physical information enhanced feature space, establishing an original data set, and establishing a physical information enhanced feature space; amplifying the original data set by adopting a data enhancement method, and establishing an amplified data set; a multi-step feature screening strategy is adopted to determine key features influencing the material performance; establishing a key feature-material performance prediction model; performing collaborative optimization on the multi-target performance by using a multi-target optimization strategy, and performing additive manufacturing to obtain a workpiece; and carrying out microstructure characterization on the workpiece by adopting a transmission electron microscope. According to the design method provided by the invention, the problems of high cost, long period, low reliability and the like in the high-performance titanium alloy component and process optimization design process can be effectively solved.

This invention belongs to the field of metallic material preparation technology, and specifically relates to a machine learning-based design method for interstitial element-strengthened titanium alloys in additive manufacturing. This machine learning-based design method includes: constructing a physical information-enhanced feature space; establishing an original dataset; augmenting the original dataset using data augmentation methods to establish an augmented dataset; using a multi-step feature screening strategy to determine key features affecting material properties; establishing a key feature-material property prediction model; using a multi-objective optimization strategy to collaboratively optimize multi-objective properties; and performing additive manufacturing to obtain a part; and using transmission electron microscopy to characterize the microstructure of the part. The design method provided by this invention can effectively solve the problems of high cost, long cycle, and low reliability in the composition and process optimization design of high-performance titanium alloys.

The application relates to a method for improving the impact toughness of a Ti-Zr-V-Nb-Al light-weight high-entropy alloy prepared through additive manufacturing, and belongs to the technical field of high-entropy alloys and additive manufacturing. Through a double-powder feeding additive manufacturing technology, a spatial non-uniform distribution of interstitial elements can be formed in the formed alloy, and a composition heterogeneous structure of the interstitial elements is formed. A large number of regions and interfaces with different mechanical properties are contained in the composition heterogeneous structure. The material can absorb more energy and then break under the action of an impact load, so that the impact toughness of the material is effectively improved.

This invention discloses a high-entropy alloy material doped with interstitial elements for nuclear applications, denoted as (Ti). a V b Cr c Al d Zr e )X f X is selected from one of the interstitial elements O, B, and N. This invention also discloses a method for preparing nuclear interstitial element-doped high-entropy alloy materials. This method includes the following steps: 1. Mechanical alloying; 2. Sintering; 3. Rolling; 4. Heat treatment, to obtain nuclear interstitial element-doped high-entropy alloy materials. This invention introduces interstitial elements to occupy the interstitial positions of the high-entropy alloy through mechanical alloying and sintering, hindering atomic movement, improving the strength of the high-entropy alloy, and stabilizing the single-phase solid solution structure of the high-entropy alloy. Subsequent rolling and heat treatment refine the grain size of the high-entropy alloy, promote the generation of dislocation cross-slip, and improve the high-temperature strength and ductility of the high-entropy alloy. It is suitable for new high-temperature nuclear reactor shells, pipes, and core structural components.

This invention relates to the field of high fatigue strength titanium alloy technology, specifically to a method for preparing TA15 alloy bars with high fatigue strength through synergistic regulation. The method involves increasing the content of the main elements Al, Mo, V, and Zr, controlling the content of interstitial elements Fe, O, and C, and adding trace amounts of Nb to obtain a novel TA15 alloy composition. First, a 520mm TA15 alloy ingot is prepared by three vacuum arc remelting processes. Next, the TA15 alloy ingot is forged, and by reducing the forging temperature of the forming passes and increasing the deformation, a 180mm transfer bar is obtained. Subsequently, at the rolling temperature, by controlling the deformation between passes, the 180mm bar is rolled to a 65mm diameter in a single pass. Finally, within the range of 800-850℃, the 65mm bar is solution-treated to obtain a 65mm TA15 alloy bar. The 65mm TA15 alloy bar prepared by this invention has a uniform and fine primary α phase with a primary α phase content of 45~55%, a uniformly broken secondary α phase, and a smooth surface with a high cycle fatigue strength ≥698MPa.

The application belongs to the technical field of titanium alloy material and bar processing, and particularly relates to a high plasticity and toughness low-interstitial titanium alloy and a bar preparation method thereof. The raw materials are mixed, pressed and assembled and welded into a consumable electrode, and the bar is obtained through smelting, forging and heat treatment. Through the synergistic process control of component optimization and preparation, the content of interstitial elements in the alloy is reduced, the impact energy of the prepared high plasticity and toughness low-interstitial titanium alloy bar is greater than or equal to 60 J, the fracture toughness is greater than or equal to 115 MPa.m 1 / 2 , the dynamic rheological stress is greater than or equal to 1580 MPa, the dynamic plastic strain is greater than or equal to 0.33, and the dynamic impact absorption energy is greater than or equal to 520 J / cm 3 under the condition of 10 ‑1 s 3 grade strain rate, the tensile strength at 500 DEG C is greater than or equal to 850 MPa, the dynamic rheological stress is greater than or equal to 1260 MPa, the dynamic plastic strain is greater than or equal to 0.46, and the dynamic impact absorption energy is greater than or equal to 579 J / cm 3 under the condition of 10 ‑1 s 3 grade strain rate.

A hydrogen-permeable membrane according to the present invention is composed of a PdCu-based alloy. The PdCu-based alloy is composed of 47.0-49.0 atom% of Pd, 0.001-0.15 atom% of an interstitial element EI, and 0.01-1.0 atom% of a substitutional element ES, where the balance is Cu and unavoidable impurities. The PdCu-based alloy contains, as the interstitial element EI, at least one element from among B, C, and N, and contains, as the substitutional element ES, a metal element necessarily including at least one of Ag, Au, and Al. The hydrogen-permeable membrane according to the present invention has improved hydrogen permeability in a low-temperature region of 200℃ or lower. Specifically, in the hydrogen-permeable membrane, the ratio (φ100 / φ300) between the hydrogen permeation coefficient φ100 at 100°C and the hydrogen permeation coefficient φ300 at 300°C is 0.4 or greater.

A strip made of ferritic stainless steel having a specific composition, in particular with reference to the quantities of C, N, Nb, Al, Zr and Ti, and with additional compositional constraints relating to these elements in order to ensure complete stabilization of the interstitial elements C and N, counteracting the phenomenon of sensitization and thus ensuring excellent corrosion resistance, as well as controlling the distribution of the precipitated fraction between carbides and nitrides, ensuring the type of precipitates responsible for creep resistance, while improving cyclic oxidation resistance.

The invention discloses a high-density solid hydrogen storage material based on TiFe alloy doping modification and a preparation method of the high-density solid hydrogen storage material, and particularly relates to the field of solid hydrogen storage materials and hydrogen energy application. The crystal structure of the material comprises a first sub-lattice, a second sub-lattice and an interstitial site set which are mutually occupied and independent; wherein the first sub-lattice is a Ti-site sub-lattice, and the Ti-site sub-lattice takes a Ti element as a matrix and contains at least one of a first stabilizing element Zr and a second stabilizing element Al. In the preparation process, preferential solid solution of various functional elements in gemini crystal lattices and space occupation distribution of interstitial elements are regulated and controlled, migration of doped atoms in the hydrogenation cycle process and formation of segregation bands are inhibited from the double aspects of dynamics and thermodynamics, and therefore chemical potential inverse wells are eliminated, and the reversible hydrogen desorption efficiency is improved.

The invention discloses a low-oxygen fully-compact titanium alloy powder metallurgy method. The method comprises the steps that titanium alloy powder with the low interstitial element content is provided; forming under a protective atmosphere to obtain a green body; performing vacuum sintering; and then high-pressure inert gas is introduced for pressure sintering. A preferable scheme comprises powder particle size grading, a specific forming mode, atmosphere purity control, green body preservation time limit, interstitial element content mathematical relationship and powder preheating and activating treatment. The invention also relates to the low-oxygen fully-dense titanium alloy product prepared by the method. According to the method, densification is effectively promoted and oxidation is inhibited under the action of vacuum and air pressure, low-oxygen control of the titanium alloy structural part under the full-densification condition is achieved, the subsequent hot working procedure is omitted, and the production cost is reduced.

The present invention relates to the technical field of alloy powder preparation, and particularly to a high-fluidity titanium alloy powder and a preparation method thereof. The preparation method of the present invention comprises the following steps: after introducing a protective gas, feeding a titanium alloy wire into a plasma generator for vaporization and smelting, and then sieving to obtain a titanium alloy powder; adding a synergist and a flow aid and stirring evenly to finally obtain the high-fluidity titanium alloy powder; the addition of the flow aid can generate a stable nano-scale passivation film on the surface of the titanium alloy powder, thereby improving the fluidity of the titanium alloy powder and reducing the possibility of the titanium alloy powder adsorbing interstitial elements such as oxygen and nitrogen in the environment, thereby increasing the purity; the synergist can react with the passivation film when the high-fluidity titanium alloy powder is subjected to high-temperature treatment, thereby improving the plasticity of the high-fluidity titanium alloy powder and the fracture toughness of the prepared device, so that the titanium alloy powder of the present invention has higher stability, fluidity and application prospects.

This invention provides a technology for preparing ultra-high strength and toughness pure titanium materials based on titanium waste, relating to the technical field of titanium waste recycling. The technology uses pure titanium waste as raw material, and through powdering, forming, sintering, and thermomechanical treatment, prepares ultra-high strength and toughness pure titanium with a tensile strength ≥900MPa and an elongation ≥11%. It eliminates the need for traditional alloying elements such as Al, V, Mo, Zr, Cr, and Ta; by simply controlling the interstitial elements in the recycled powder, a synergistic match of ultra-high strength and high plasticity can be achieved in the recycled pure titanium. This invention significantly expands the tolerance range of pure titanium materials to oxygen content, increasing the acceptable oxygen content from no more than 0.33wt.% in traditional engineering applications to 1.1wt.%, greatly reducing the purity requirements for raw materials in titanium waste recycling, lowering recycling difficulty and manufacturing costs, and showing broad application prospects in the field of green and low-cost titanium material manufacturing.

This invention relates to a method for manufacturing hot rolling mill rolls by laser cladding a reusable steel shaft substrate with a rotationally symmetric axis with a metal coating outer layer having a tool steel composition, wherein the composition of the metal coating outer layer includes 0.5%-3.5% C, 2%-18% Cr, 0.5%-7% Mo, 0.5%-8% V, 0.2%-7% W, 0%-5% Nb, 0%-1% Ti, 0.5%-2% Mn, 0.2%-3% Si, and 0%- 3% Ni, the remainder being Fe and unavoidable impurities; characterized in that: - the composition of the outer layer of the metal coating further includes nitrogen in the range of 200-2500 ppm; - the total atomic content (mass%) of the MC carbide-forming elements selected from the group consisting of Ti, Nb and V + 3 / 8 of the total atomic content (mass%) of the M23C6 and / or M2C-forming elements selected from the group consisting of Mo, W and Cr is lower than the total atomic content (mass%) of the interstitial elements C and N + 0.01.

The invention discloses an ultralow-yield-ratio 0Cr16Ni5Mo martensitic stainless steel forge piece and a manufacturing method. The ultralow-yield-ratio 0Cr16Ni5Mo martensitic stainless steel forge piece comprises less than or equal to 0.05% of C, less than or equal to 2.00% of Mn, 15.00-17.50% of Cr, 3.50-6.00% of Ni, 0.30-1.50% of Mo, 0.30-1.20% of V, less than or equal to 0.30% of Cu, less than or equal to 0.0008% of N and less than or equal to 0.0008% of B. The quenched and cooled forge piece is kept in oil cooling or water cooling at the temperature of 100 DEG C or below; by reducing the content of C, forbidding interstitial elements N and B, increasing the proportion of Mn and Ni and adopting low-temperature cooling treatment in the solid solution quenching process, the ultra-low yield ratio martensitic stainless steel forge piece with strip-shaped ferrite evenly distributed in martensite is obtained. The yield strength of the forge piece is 250-450 N / mm < 2 >, the tensile strength is larger than or equal to 880 N / mm < 2 >, and the impact toughness Akv2 (-20 DEG C) is larger than or equal to 180 J.

The application provides a tantalum material and a preparation method thereof. The preparation method comprises the following steps: S1, obtaining a carbonized tantalum by reducing tantalum pentoxide by using a carbon material, wherein the carbon material is selected from any one or more of graphite and carbon black; S2, mixing the carbonized tantalum and the tantalum pentoxide to form a mixture, wrapping the mixture with a tantalum metal, and then performing vacuum reduction sintering to obtain a tantalum reduction material block; and S3, performing electron beam melting on the tantalum reduction material block to obtain the tantalum material. In step S2, the sintering of the carbonized tantalum and the tantalum pentoxide is performed under the premise of being wrapped with the tantalum metal, that is, no organic binder is introduced in the sintering forming process, so that the carbon, oxygen and nitrogen caused by the sintering residue of the organic binder are effectively avoided, and the content of carbon, oxygen and nitrogen in the tantalum reduction material block is effectively reduced; and then the electron beam melting is further adopted to further reduce the content of interstitial elements such as nitrogen and oxygen by using the characteristics of the electron beam melting, so that the obtained tantalum material has the characteristics of low carbon, oxygen and nitrogen.

The invention discloses a high-interstitial-element Gr4 titanium alloy bar and a preparation method and application thereof, belongs to the technical field of titanium alloys, and solves the problems that in the prior art, pure titanium is low in strength and cannot meet the use requirements of medical titanium alloys, and an existing Gr4 alloy preparation method is long in process, complex in preparation method and cannot meet the requirements of low-cost industrial production. The preparation method comprises the steps that a cast ingot is subjected to one-heating-number cogging forging to obtain an initial blank, the initial blank is subjected to two-heating-number rolling to obtain an intermediate blank, the deformation is controlled to be larger than 50% in the one-heating-number rolling process, and the deformation is controlled to be larger than 90% in the two-heating-number rolling process; and after the middle blank is coiled, vacuum annealing is conducted, then cold drawing is conducted, and the Gr4 titanium alloy bar is obtained. According to the preparation method, the medical Gr4 titanium alloy bar with excellent mechanical strength and good toughness can be prepared with low cost and high efficiency, and the Gr4 titanium alloy bar prepared by the preparation method has the advantages of high strength, high toughness and stable performance.

The invention relates to the technical field of titanium alloys with high fatigue strength, in particular to a method for preparing a TA15 alloy bar with high fatigue strength through coordinated regulation, novel TA15 alloy components are obtained by increasing the content of main elements Al, Mo, V and Zr, regulating the content of interstitial elements Fe, O and C and adding a trace Nb element, firstly, vacuum self-consuming electric arc smelting is performed for three times, and finally the TA15 alloy bar with high fatigue strength is obtained. A TA15 alloy cast ingot with the specification of phi 520 mm is prepared; secondly, the TA15 alloy cast ingot is subjected to cogging forging, and a transferred bar with the specification of phi 180 mm is obtained by reducing the forging temperature of the forming heating number and increasing the deformation amount; then, at the rolling temperature, the bar with the specification of phi 180 mm is subjected to one-fire rolling to the bar with the specification of phi 65 mm by controlling the deformation between passes; and finally, within the range of 800-850 DEG C, the TA15 alloy bar with the specification of phi 65 mm is obtained by conducting solid solution regulation and control on the bar with the specification of phi 65 mm. According to the TA15 alloy bar with the specification of phi 65 mm, the primary alpha phase is uniform and fine, the content of the primary alpha phase is 45-55%, the secondary alpha phase is crushed uniformly, and the smooth high-cycle fatigue strength is larger than or equal to 698 MPa.