2143 results about "Alloy composition" patented technology

The invention discloses a high-performance copper alloy pipe and a preparation method thereof. The Sn, Ni and P elements are compositely added into Cu, the content and proportion of all the elements are regulated and controlled, meanwhile, a recrystallization treatment process is combined, a high-proportion sigma 3, sigma 9 and sigma 27 coincidence lattice grain boundary is introduced, and the copper alloy pipe with high strength, high machining forming capacity and excellent pressure resistance, corrosion resistance and high-temperature softening resistance is prepared. Meanwhile, Zr, Co and B (optionally) elements are added on the basis of the alloy components, so that the performance of the copper alloy pipe is further improved. The tensile strength, the processing formability, the pressure resistance, the corrosion resistance and the high-temperature softening resistance of the copper alloy pipe are far better than those of a TP2 copper pipe of the same specification and an existing high-strength copper pipe, the performance requirements of the high-pressure-resistance thin-wall seamless copper pipe are met, and the copper alloy pipe has wide application prospects in the heat exchange field.

The invention belongs to the technical field of steel and iron material design, and discloses a stainless steel strength and toughness collaborative optimization method and system based on heterogeneous integration, and the method comprises the steps: constructing a database of stainless steel components, process parameters and mechanical properties; according to the database, establishing a stacked heterogeneous integration model; quantizing contribution weights of input variables of the stacked heterogeneous integrated model to mechanical properties based on an SHAP method, identifying key factors, and setting a multi-target strength and toughness collaborative optimization index to guide an optimization direction; optimal components and processes are screened according to SHAP analysis, a sample is prepared through vacuum melting, hot rolling and heat treatment, the performance is verified according to the ASTM standard, and a final optimization scheme is determined; and a cross-scale digital twinborn verification system is constructed, and collaborative optimization of alloy components, process and macroscopic performance is realized. According to the method, the problems of low efficiency and insufficient generalization ability of a single model of a traditional trial and error method are solved, and an efficient and explainable intelligent optimization scheme is provided for development of high-performance stainless steel.

According to the alloy die-casting forming method and system based on intelligent parameter optimization, dynamic data streams in the die-casting process are collected in real time by introducing a sensor network, die-casting parameters are dynamically adjusted through a feedback control system, and the alloy die-casting forming method and system based on intelligent parameter optimization can automatically adapt to different alloy components and die design conditions; and it is ensured that each time of die-casting operation can be conducted under the optimal condition. According to the method, the consistency and the stability of the product quality are improved, and the production efficiency is remarkably improved. And through accurate control over the die-casting process, the quality problem caused by improper parameter setting is reduced, and high quality of each batch of products is guaranteed. The dynamic data flow is analyzed in real time, the factor fluctuation mode influencing the product quality is recognized, the die-casting parameters are adjusted in time, the stable product performance is maintained, the limitation caused by constant parameters in the prior art is overcome, and remarkable technical progress is brought to the manufacturing industry.

The invention relates to an annealing-free alloy cold heading steel wire rod for a 12.9-grade bolt and a production method of the annealing-free alloy cold heading steel wire rod. The production process comprises the steps of molten iron pre-removal of P / S, electric furnace or converter smelting, external refining, bloom continuous casting, rolling into an intermediate billet and steel billet finishing, intermediate billet heating, high-pressure water descaling, rough rolling, intermediate rolling, pre-finish rolling, finish rolling, spinning, coil collecting and cooling. The annealing-free alloy cold forging steel wire for the 12.9-grade bolt comprises the following components in percentage by mass: 0.30%-0.35% of C, 0.10%-0.30% of Si, 0.70%-1.20% of Mn, 1.0%-1.5% of Cr, 0.15%-0.30% of Mo, 0.015%-0.030% of Al, 0.0030%-0.0080% of N, 0.01%-0.04% of Nb, less than or equal to 0.30% of Ni, less than or equal to 0.10% of Cu, less than or equal to 0.015% of P, less than or equal to 0.010% of S, less than or equal to 0.012% of (As + Sb + Bi), less than or equal to 0.0010% of O and the balance of Fe and inevitable impurity elements, the niobium-nitrogen product (Nb * N) is greater than On the premise that main alloy components are not reduced, a fine grain structure can be obtained under a certain condition by adding grain refining elements, and the delayed phase change effect the same as that of a low-temperature finish rolling process is achieved by utilizing the delayed phase change characteristic of the fine grain structure.

The present invention provides: a copper alloy material which has a volume resistivity within a desired range, has a thermal electromotive force against copper having a small absolute value, and has a temperature coefficient of resistance of 0 or a negative number having a small absolute value over a wide temperature range from a normal temperature (for example, 20° C) to a high temperature (for example, 150° C); and a resistive material for resistors, a resistor, a material for heating elements, and a heating element, each using said copper alloy material.　This copper alloy material has an alloy composition that contains from 7.0% by mass to 17.0% by mass of Mn, from 0.1% by mass to 3.0% by mass of Ni, and from 1.0% by mass to 5.0% by mass of Al, with the balance being made up of Cu and unavoidable impurities. The resistive material for resistors and the material for heating elements are composed of this copper alloy material. The resistor comprises this resistive material for resistors. The heating element comprises this material for heating elements.

The invention relates to the technical field of alloy pouring processes, in particular to a magnesium alloy heterogeneous flow overall coordination pouring process which comprises the steps of conducting pouring numerical simulation through simulation software, optimizing pouring design and determining a composite flow guide structure, a mold temperature control scheme and an alloy component regulation and control strategy. Magnesium alloy smelting and refining are conducted; preheating the mold by using an intelligent temperature control system; during the period, the intelligent temperature control system monitors and adjusts the temperature of the mold, and the online alloy adding system and the impurity adsorption filtering device keep the components of the melt uniform and pure; and after pouring is completed, controlling the mold temperature according to a preset cooling curve to slowly and uniformly solidify the melt. The design of the bionic branch-shaped flow dividing structure, the dynamic adjustable flow guide plate and the like reduces casting defects, and the casting forming quality is improved. And on-line alloy adding and impurity adsorption filtering ensure that melt components are stable, and the casting performance is improved.

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 discloses an alloy for a 2230 MPa-grade high-corrosion-resistance steel strand, a wire rod, the steel strand and a method, and the alloy comprises the following components in percentage by mass: 0.89-0.93% of C, 1.20-1.40% of Si, 0.50-0.70% of Mn, 0.30-0.40% of Cr, 0.01-0.04% 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 0.0040% of N, less than or equal to 0.0020% of O and the balance of Fe and other inevitable impurities. By optimizing the chemical component design and controlling the production process, the homogeneity of the steel is improved, the homogeneity of the wire rod is improved, the purity is improved, meanwhile, surface damage and internal defects during steel wire drawing machining are reduced, and therefore the stress corrosion index of the steel strand is improved.

The invention discloses an alloy component reverse design method and system based on knowledge distillation, and relates to the field of material gene and alloy reverse design, and the method comprises the steps: collecting alloy component data and corresponding performance data, carrying out the arrangement to obtain a data set, and calculating the atomic characteristics of each alloy in the data set; constructing and training a supervised learning model based on the atomic characteristics and the performance data, and establishing a mapping relation from the atomic characteristics of the alloy to the performance; a deep neural network model is trained based on the component data and the performance data, and a mapping relation from alloy components to performance is constructed; in the deep neural network model training process, a back propagation algorithm is adopted to adjust network parameters, and the prediction difference between the deep neural network model and the supervised learning model is minimized; and sampling optimization is carried out, component optimization is carried out through gradient information of the deep neural network model, and the optimal alloy component is searched. According to the method, the components and atomic characteristics of the alloy are combined, the components of the high-performance alloy are analyzed, and customized design and optimization of the material are achieved.

The invention discloses a neodymium-iron-boron magnet with double main phases and light rare earth diffusion based on asymmetric cerium distribution and a preparation method, and relates to the technical field of neodymium-iron-boron magnets. The method comprises the steps that a diffusion matrix is prepared through a double-main-phase technology, in the double-main-phase technology, the components of a main-phase alloy and an auxiliary-phase alloy are RaCebFe100-a-b-c-dMcBd, R is PrNd alloy or Nd metal, M is at least one of Cu, Al, Zr, Co and Ga, the content of Ce in the main-phase alloy is larger than that of Ce in the auxiliary-phase alloy, then the upper surface and the lower surface of the diffusion matrix are coated with a diffusion source solution, and the diffusion matrix is obtained through heat treatment. Carrying out heat treatment and aging treatment to obtain a neodymium-iron-boron magnet; the diffusion source solution is formed by mixing a diffusion source and a solvent, and the diffusion source is (PrmNdn) aAlbCucZrdCoeMgf. The neodymium-iron-boron magnet obtained through the method has high residual magnetism and high coercive force at the same time, the diffusion efficiency of the diffusion source is high, and the rare earth utilization rate is increased.

The invention relates to the technical field of metal materials, and discloses a preparation method of high-purity vanadium, which comprises the following steps: step 1, controlling the purity, granularity and content of raw materials for preparing a vanadium-aluminum intermediate alloy; 2, carrying out an aluminothermic reaction in a vacuum aluminothermic smelting furnace; thirdly, a plate ingot is smelted in a vacuum electron beam horizontal furnace for the first time; fourthly, the plate ingot is smelted in the vacuum electron beam horizontal furnace for the second time; and 5, smelting the high-purity vanadium ingot in a vacuum electron beam ingot pulling furnace. According to the method, traditional slag formers such as CaO are not used, so that alloy components are more stable in the smelting process, component fluctuation caused by the reaction of the slag formers and main reactants is reduced, the reaction temperature and degree are controlled by controlling the addition amount of the Al2O3 cooling material, energy is saved, and the smelting cost is reduced; the beneficial effects that a CaO slag former does not need to be used, and introduction of impurities is avoided are achieved.

The invention provides a novel model and a novel method for component design of a high-flux nickel-based superalloy for additive manufacturing based on multi-objective optimization and a novel alloy, and relates to the technical field of component design of nickel-based superalloy and additive manufacturing. The invention aims to design a novel K438 alloy with excellent mechanical properties at 850 DEG C by taking the K438 alloy as an example, and the novel K438 alloy has lower crack sensitivity. The method is mainly characterized in that the influence of solidification cracks, liquefaction cracks and solid cracks is comprehensively considered, and a comprehensive crack sensitivity (CCS) model is established; the CCS values and the yield strength of 850 DEG C of tens of thousands of alloys are obtained through high-flux thermodynamics calculation by combining a CCS model and a high-temperature yield strength model, and the Pareto alloy is automatically optimized by utilizing a self-written Python script. According to the method, a data basis can be provided for design and production of the nickel-based high-temperature alloy for additive manufacturing, and a new theoretical basis and method are provided for development of the high-strength printable nickel-based high-temperature alloy.

A high-performance near-pure zinc alloy, a preparation method therefor and a use thereof, relating to the technical field of zinc alloys. The alloy component is that the content of Zn is greater than or equal to 99.5%, and the remaining trace alloy elements include at least two of the following 14 elements: Mg, Mn, Li, Cu, Ag, Ca, Sr, Fe, Zr, Ti, Al, C, Ga, and Si. The alloy has the yield strength ≥ 250 MPa, the tensile strength ≥ 320 MPa, the elongation ≥ 25%, the mechanical property change during one year of room-temperature storage ≤ 5%, the maximum bending force ≥ 2 kN, the stress corrosion sensitivity factor ≤ 15%, the size of corrosion pits after 60 days of immersion ≤ 15 μm, and the standard deviation of the size of corrosion pits ≤ 3 μm. The alloy is suitable for the preparation of biodegradable stents, bone implant devices, medical staplers or anastomotic nails for intestines, blood vessels or nerves, vascular clamps, guided bone or tissue regeneration membranes, heart valve protheses, dura mater repair membranes, soluble bridge plugs and fracturing balls for oil drilling, zinc alloy die castings, electroplated zinc materials, building zinc materials, battery-grade zinc, printing-grade zinc, and zinc-based brazing alloys.

The invention relates to a data-driven deformation nickel-based superalloy multi-objective performance reverse design optimization method, which belongs to the technical field of metal material design and development, and comprises the following steps: calculating a stable high-strength deformation nickel-based superalloy system based on a first principle, and on this basis, calculating a deformation nickel-based superalloy system; constructing a deformed nickel-based superalloy component design space based on the knowledge of the nickel-based superalloy field; based on a deformed nickel-based superalloy component design space, the deformed nickel-based superalloy component design space is reduced by adopting an empirical formula in combination with thermodynamic high-throughput calculation to obtain the reduced deformed nickel-based superalloy component design space, and based on the reduced deformed nickel-based superalloy component design space, based on machine learning and a genetic algorithm, the deformation nickel-based superalloy component design space is obtained. And a deformed nickel-based high-temperature alloy reverse design model is established, and the deformed nickel-based high-temperature alloy with the target performance is screened. Compared with the prior art, the oriented development method for the high-strength and high-toughness nickel-based high-temperature alloy is achieved by fusing cross-scale calculation, domain knowledge constraint and machine learning reverse design.

The invention discloses low-cost ultrahigh-strength maraging steel suitable for additive manufacturing. The low-cost ultrahigh-strength maraging steel comprises the following chemical components in percentage by mass: less than or equal to 0.03% of C, 13.0-15.0% of Ni, 2.5-3.5% of Mo, 2.5-3.5% of Cr, 1.3-2.5% of Mn, 0.50-0.80% of Ti, 0.05-0.15% of Al, less than or equal to 0.10% of Si, less than or equal to 0.010% of S, less than or equal to 0.010% of P and the balance of Fe. Alloy components are optimized to obtain low-cost ultrahigh-strength maraging steel components suitable for additive manufacturing, after the maraging steel components are made into wires or powder, a formed part obtained through additive manufacturing is subjected to solid solution for 1 h at the temperature of 700-850 DEG C and aging for 6 h at the temperature of 400-500 DEG C, the tensile strength of the formed part is not lower than 1.6 Gpa, and the percentage elongation after fracture is not lower than 8.0%.

The invention discloses an amorphous forming ability prediction method based on Transform and table data conversion. The amorphous forming ability prediction method comprises the following steps: acquiring basic attributes and amorphous forming ability attributes of amorphous alloy composition elements in a metal alloy sample; the basic attributes refer to element properties simulated based on an experiment or a density functional theory and comprise atomic basic properties, chemical properties and physical properties, and the amorphous forming ability attributes comprise a critical casting diameter Dmax; generating an amorphous alloy data set; wherein the data set comprises an independent variable and a response variable, the independent variable comprises element composition and mixing enthalpy Hmix, and the response variable is a critical casting diameter Dmax; defining a relation model, wherein the relation model is an integrated model formed by three types of models; and training the integrated model by using an amorphous alloy data set, and constructing an amorphous forming ability evaluation model. According to the technical scheme, various relation models for predicting the critical casting diameter can be trained, and the various relation models are combined to construct the optimal amorphous forming ability evaluation model.

The invention belongs to the technical field of aluminum alloy production, and particularly discloses a low-carbon environment-friendly method for producing a high-strength 8006 alloy container foil, aluminum alloy component proportion and melt treatment and cold rolling production processes are optimized, a large amount of regenerated aluminum waste can be digested, energy consumption is lower than that of a primary aluminum ingot by 50% or above, a blank with the thickness of 1.5 mm is produced through triple continuous rolling, and the production cost is low. The container foil finished product is rolled through 4-5 passes of cold foil rolling, compared with a conventional scheme, the rolling passes are reduced by 2-3, the machining cost is saved by 500 yuan / ton, the blank thickness can be reduced through the production scheme, the cold foil rolling production passes are reduced, high-temperature intermediate annealing is not needed in the cold rolling production process, about 280 kw.h annealing power consumption is saved for each ton, low-carbon short-process production is achieved, and the production cost is reduced. The tensile strength of the finished product is larger than or equal to 150 MPa, the ductility is larger than or equal to 18%, the tensile strength is about 20 MPa higher than that of container foil produced through a conventional scheme, deformation is not likely to happen after punching forming, and the terminal use effect is better.

The invention relates to the technical field of intelligent manufacturing, in particular to a nodular cast iron alloy component self-adaptive optimization method and system based on artificial intelligence, and the method comprises the following steps: obtaining furnace temperature and component parameters, generating a stable comparison legend, screening offset abnormal combinations to form an available set, extracting performance curve characteristics to construct a trend chart, and obtaining a nodular cast iron alloy component self-adaptive optimization result. And superposing the structural parameters and the element distribution positioning segregation area, and outputting feeding correction parameters to generate an optimization scheme. According to the method, normalization processing is carried out on furnace temperature, carbon-silicon ratio and other multi-factor offset values, a component offset map is constructed, trend feature extraction and sorting of response curves under multiple working conditions are combined, component combinations with stable performance are screened out, a mapping relation is established through the structural curvature, the wall thickness slope and the injection rate, and a spatial coincidence map is generated through coincidence analysis. And the feeding direction and the injection rate are inversely calculated, dynamic adaptation of components and the structure is achieved, and the structure uniformity and the performance consistency are improved.

The invention discloses an ultrahigh-strength 13-micron battery aluminum foil and a preparation method thereof, and belongs to the technical field of battery aluminum foils. The battery aluminum foil comprises the following alloy elements in percentage by mass: 0.23 to 0.27 percent of Si, 0.44 to 0.50 percent of Fe, 0.185 to 0.205 percent of Cu, 0.86 to 0.90 percent of Mn, 1.19 to 1.24 percent of Mg, less than or equal to 0.04 percent of Cr, less than or equal to 0.06 percent of Zn, 0.01 to 0.025 percent of Ti and the balance of Al. The preparation method comprises the following steps: (1) smelting and casting; (2) homogenizing; (3) hot rolling: performing multi-pass hot rolling on the homogenized aluminum alloy cast ingot to obtain a hot-rolled coiled material, and controlling the finish rolling temperature to be greater than or equal to 330 DEG C; (4) cold rolling: after the hot-rolled coiled material is cooled, performing multi-pass cold rolling to obtain a cold-rolled finished product, and annealing the cold-rolled finished product after cold rolling; (5) foil rolling is carried out, after the annealed cold-rolled finished product is cooled, multi-pass foil rolling is carried out, and primary foil rolling intermediate annealing is carried out between foil rolling passes; and (6) slitting to obtain the battery aluminum foil. The ultrahigh-strength tensile battery aluminum foil is obtained by combining alloy component regulation and control with a preparation process.

Embodiments relate to system and methods involving use of a technique for managing a database for producing a material composition having a thermodynamic phase. The technique can include: receiving a binary phase diagram for each material to be used as a component of a high-entropy alloy (HEA); using one or more active learning machine learning techniques for generating a feature, the feature including: a primary feature that is representative of a probability that an HEA will exhibit a solid solution phase and / or an intermetallic phase, and a physics-based feature that is representative of a factor related to formation of a desired intermetallic HEA phase; encoding the primary feature and the physics-based feature; generating an output representation of a HEA alloy composition and phase of a predicted materials composition; and selecting a HEA composition and phase that will meet a material design criterion.

The invention relates to the technical field of magnetic material preparation and heat treatment, in particular to a heat treatment process window widening method for a high-magnetic-conductivity nanocrystalline strip, which comprises the following steps of: by gradient component design and pulsed magnetic field coupling heat treatment, enabling the initial magnetic conductivity of the strip to exceed 22,000 and widening the heat treatment temperature interval to 400-600 DEG C; the alloy comprises 73.5% of Fe, 1% of Cu, 3% of Nb, 13.5% of Si, 8.5% of B and 0.5% of Co, during heat treatment, the temperature is increased to 450 DEG C at the speed of 15 DEG C / min, a 0.8 T pulsed magnetic field is applied for heat preservation, then the temperature is increased to 550 DEG C for heat preservation, alpha-Fe (Si) nanocrystalline and Co-B amorphous interface phases are generated through crystallization, and Co is distributed in a solid solution mode. The method widens the heat treatment temperature interval, improves the initial magnetic conductivity of the strip, improves the toughness, meets automatic production, and reduces the cost by using the existing equipment; and the prepared strip is high in magnetic conductivity, good in stability, suitable for various scenes and good in economic benefit and social benefit.

The invention discloses a high-throughput preparation method of an alloy material based on centrifugal supergravity solidification. The method comprises the steps that alloy raw materials are put into a smelting furnace to be subjected to vacuum smelting and pouring, and a cast ingot is obtained; the cast ingot is sequentially subjected to linear cutting, mechanical grinding, ultrasonic cleaning and constant-temperature drying, and an alloy original material of the super-gravity prepared alloy is prepared; processing the original alloy material into a block cast ingot and putting the block cast ingot into a crucible; placing the crucible in a centrifugal supergravity casting furnace; carrying out supergravity solidification on the block cast ingot in the crucible by utilizing a centrifugal machine and a centrifugal supergravity casting furnace; and finally taking out the block cast ingot to obtain a solidified alloy sample. The device is simple in structure, easy to operate and high in safety coefficient, and alloy samples with alloy components and microstructures in gradient distribution in the supergravity direction can be obtained.

The invention is suitable for the technical field of alloy material analysis, and provides a TME composite algorithm-based high-entropy alloy performance prediction method and a TME composite algorithm-based high-entropy alloy performance prediction system, and the method comprises the steps of firstly obtaining hardness characteristic data set information of a target alloy, and then inputting the hardness characteristic data set information into a trained multi-layer perceptron model, and performance prediction result information can be quickly and accurately generated. According to the method, the advantages of the converter model, the multi-layer perceptron model and the egret swarm optimization algorithm can be combined, the precision of high-entropy alloy performance prediction is effectively improved, the prediction cost and the calculation amount are reduced, the prediction precision and the generalization ability of the model are enhanced, and the method is suitable for performance prediction of various high-entropy alloys and has wide application prospects. Efficient application of the prediction model under different alloy components and process conditions is ensured, and reliable technical support and reference are provided for research, development and application of the high-entropy alloy.

Designed in the present disclosure are a high-strength aluminum-erbium alloy for additive manufacturing and a preparation method therefor. The alloy comprises: 4-20 wt% of erbium (Er); 2-10 wt% of magnesium (Mg); less than or equal to 1 wt% of manganese (Mn); optionally, 0-1 wt% of scandium (Sc); and optionally, 0-1 wt% of zirconium (Zr). In the present disclosure, in order to improve both the formability and the mechanical properties of the alloy, based on alloy composition design assisted by a phase diagram calculation method, an Al-Er eutectic system is selected to reduce a solidification interval and form a fine grain phase, and therefore the technical effects of structure refinement, no thermal cracks and good printing performance are achieved; and in particular, a continuous cellular FCC configuration Al3Er eutectic network structure with a plastic deformation capability is introduced, with a size in the order of hundreds of nanometers, and therefore both strengthening and toughening effects are achieved. The aluminum-erbium alloy has both good printing formability and comprehensive mechanical properties, and the preparation method therefor is proven, has low costs and high efficiency, and can be used for large-scale industrial production.

The invention relates to the technical field of soldering tin, in particular to a low-splashing lead-free tin wire coated with rosin, which comprises the following alloy components: Sn, Sb, Cu, Ge, P, Ga, In and Ni. The solder wire is manufactured through extrusion forming and is coated with scaling powder composed of rosin resin, maleic anhydride, polyoxypropylene glycerol ether, composite ammonium salt, a solvent, sodium carboxymethyl cellulose and polyvinyl butyral. By optimizing the alloy components and the formula of the soldering flux and adding antimony, copper, germanium, phosphorus, gallium, indium and nickel elements, the fluidity and wettability of a solder wire are improved, soldering tin is easier to spread in the welding process, the outer covering rosin is decomposed in the welding process to generate active substances, oxides on the surface of metal can be removed, and the welding quality is improved. Good contact between the soldering tin and the metal surface is promoted, the surface tension of the soldering tin is further reduced, the fluidity of the soldering tin is improved, and therefore the splashing rate is remarkably reduced.

The invention relates to the technical field of thermal expansion cutter handle production, in particular to steel with light weight, high heat resistance and long fatigue life as well as a preparation method and application of the steel, and alloy components for synthesizing the steel comprise the following components in percentage by weight: 0.45 to 0.65 weight percent of C, 6.0 to 9.0 weight percent of Mn, 6.5 to 10.0 weight percent of Ni, 8.0 to 12.0 weight percent of Cr, 1.5 to 3.0 weight percent of Mo, 0.8 to 2.0 weight percent of V, 1.5 to 4.0 weight percent of Cu, 1.5 to 3.0 weight percent of Si, 0.015 to 0.045 weight percent of Nb, 0.035 to 0.100 weight percent of Ti, 0.05 to 0.2 weight percent of N and the balance of Fe. According to the preparation method, the alloy components are specifically matched and combined, the production cost is effectively reduced, the obtained steel is excellent in mechanical property, low in density and higher in heat resistance and fatigue resistance, and after the steel is applied to the thermal expansion cutter handle, the machining efficiency of a machine tool can be improved.

The invention relates to the technical field of metal material machining, and provides a high-strength titanium alloy and a forging method thereof.The forging method of the high-strength titanium alloy comprises the steps that vacuum consumable smelting is conducted on a titanium alloy raw material to obtain a titanium alloy cast ingot, and the titanium alloy cast ingot is pretreated to obtain a first titanium alloy cast ingot; and the first titanium alloy cast ingot is sequentially subjected to cogging forging, intermediate billet forging, octagonal drawing-out forging and round bar drawing-out forging and then is air-cooled to the room temperature, and the high-strength titanium alloy is obtained. According to the high-strength titanium alloy and the forging method thereof, the high-strength titanium alloy is developed through optimization and adjustment on the basis of TA15 alloy components, and a high-strength titanium alloy large-size round bar with the diameter specification of 300-400 mm is obtained through the forging method matched with the high-strength titanium alloy.

The invention provides a flame-retardant magnesium alloy with efficient forming diversification and a preparation method of the flame-retardant magnesium alloy. The flame-retardant magnesium alloy comprises the following components in percentage by mass: 4.0-10.0% of Al, 0.2-1.6% of Ca, 0.01-0.5% of Mn, 0.1-1.5% of RE, less than or equal to 0.05% of inevitable impurities and the balance of Mg, and the added RE is one or any combination of Ce, Sm, La and Sr. The preparation method comprises the following steps: smelting and casting, granulating and pulping, and performing pressure injection molding. According to the preparation method, diversified efficient forming of complex curved surfaces, thin-wall parts, special-shaped components and the like can be achieved through cooperative regulation and control of components, the process and the structure, and the obtained flame-retardant magnesium alloy is compact in structure, has the multi-level structural characteristics including a spherical primary solid phase, a fine solidification secondary phase and a grain boundary net-shaped eutectic phase and meanwhile has good flame retardance and mechanical performance; the ignition point is 750-1200 DEG C, the yield strength is 130-200 MPa, the tensile strength is 230-300 MPa, the ductility is 5-20%, and the aluminum alloy is suitable for industrial production.

The invention relates to a corrosion-resistant alloy welding wire, in particular to an ERNi CrMo-3 corrosion-resistant alloy welding wire and a preparation method thereof. The steel comprises the following chemical components in percentage by mass: greater than or equal to 64% of Ni, 21%-23% of Cr, 8.5%-10% of Mo, less than or equal to 0.2% of Fe, 0.1%-0.3% of Ti, 0.1%-0.25% of Al, 3.5%-4.15% of Nb, less than or equal to 0.2% of Cu, less than or equal to 0.02% of C, less than or equal to 0.5% of Mn, less than or equal to 0.35% of S i, less than or equal to 0.005% of S and less than or equal to 0.005% of P. By adopting vacuum induction melting and electroslag remelting, the content of all elements in the alloy can be accurately controlled, the content of impurity elements (H, O, N, S, P and the like) is effectively reduced, the content of oxygen and nitrogen is controlled to be not larger than 20 ppm, alloy components are more uniform and stable, and therefore the corrosion resistance and the high-temperature mechanical property of the welding wire are improved.

The invention relates to the technical field of welding materials, and discloses washable semiconductor solder paste and a preparation method and application thereof. The washable semiconductor solder paste comprises scaling powder and tin powder, wherein the mass ratio of the scaling powder to the tin powder is 1: (8-9.6); the soldering flux comprises the following raw material components: a film-forming agent, composite organic acid, a thixotropic agent, a surfactant, an antioxidant and a solvent, wherein the composite organic acid is composed of succinic acid and glutaric acid according to the mass ratio of (1-3): (1-2.5). According to the washable semiconductor solder paste, the particle size, the melting point and the alloy components of the tin powder are controlled, composite organic acid composed of succinic acid and glutaric acid in a specific proportion is adopted in the soldering flux, and other components are matched with one another; the tin powder and the soldering flux in a specific mass ratio are combined, so that the prepared washable semiconductor solder paste is good in wettability, the expansion rate is larger than or equal to 85%, the storage life reaches 3 months, and the washable semiconductor solder paste can be directly cleaned with water after being welded and is high in corrosion resistance and oxidation resistance.