17 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.

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 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 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.

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.