3144 results about "Toughness" patented technology

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.

The invention belongs to the technical field of metal material engineering, and relates to a light high-toughness low-cost aluminum alloy and a preparation method thereof.The alloy comprises, by mass, 7.0%-9.2% of Mg, 2.5%-4.0% of Zn, 0.06%-0.20% of Zr, 0.01%-0.03% of Sb, main impurities including Fe smaller than or equal to 0.15%, Si smaller than or equal to 0.12%, other single impurities smaller than or equal to 0.05%, the total impurity smaller than or equal to 0.15% and the balance Al. Compared with 2xxx series and 7xxx series aluminum alloys, the alloy has certain advantages in the aspects of density, specific strength, ductility, corrosion resistance and the like, and has a remarkable cost advantage compared with a low-density aluminum-lithium alloy, so that the core competitiveness of an alloy product is improved, and the alloy product has the potential of becoming a next-generation commercial aluminum alloy.

The invention relates to the technical field of construction and the technical field of software, and discloses a fabricated structure evaluation method and device based on a toughness value and carbon emission, and the method comprises the steps: adding the damage volumes of all interfaces, and obtaining the damage amount of a fabricated structure; when the damage amount of the fabricated structure is within the damage range, a repair scheme of the fabricated structure is obtained, and the carbon emission amount of the repair scheme is generated; according to the length of each interface, the inertia moment of the complete part of each interface, the moving distance of the neutral axis of each interface and the contact surface rigidity model, the contact surface rigidity of the fabricated structure is generated, and according to the contact surface rigidity of the fabricated structure, the material elasticity modulus of the fabricated structure and the toughness model, the toughness value of the fabricated structure is generated. And performing specific value calculation on the carbon emission of the repair scheme and the toughness value of the fabricated structure to generate an evaluation value of the repair scheme. According to the invention, the evaluation efficiency of the repair scheme of the fabricated structure can be improved.

The high-steel-grade low-cost hot-rolled coil plate comprises the following chemical components: 0.040 to 0.065 percent of C, 0.20 to 0.35 percent of Si, 1.48 to 1.75 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.003 percent of S, 0.012 to 0.025 percent of Ti, 0.035 to 0.055 percent of Nb, 0.005 to 0.008 percent of RE, 0.15 to 0.20 percent of Cr, 0.0005 to 0.0020 percent of B, 0.002 to 0.004 percent of Mg, 0.025 to 0.050 percent of Als, less than or equal to 0.003 percent of Ca, less than or equal to 0.008 percent of N and the balance of Fe and inevitable impurities. The technological process comprises the steps of smelting, slab continuous casting, slab heating, rolling, cooling and coiling. Rt0.5 of the steel is 580-660 MPa, Rm is 650-750 MPa, A50 mm is larger than or equal to 28%, Rt0.5 / Rm is smaller than or equal to 0.90, the impact energy mean value Akv at the temperature of-40 DEG C is larger than or equal to 200 J, the drop weight DWTT mean value at the temperature of-20 DEG C is larger than or equal to 90%, the hardness value HV10 is smaller than or equal to 220, and the cold bending performance is qualified. The product provided by the invention has high strength and toughness and good welding performance, so that the product is more suitable for various complex and extreme service environments, and has higher safety in pipeline engineering.

The invention discloses a high-conductivity palladium alloy for a chip test probe and a preparation method of the high-conductivity palladium alloy, and the palladium alloy comprises the following components in percentage by mass: 50-58% of Pd, 35-40% of Cu, 5-10% of Ag, 0.05-1.0% of Cr and 0.1-1.5% of auxiliary elements, the auxiliary element is selected from at least one of Al, Zn, In and Si; the resistivity of the palladium alloy is 8.0 mu omega.cm or below, the Vickers hardness is 450 HV or above, the 90-degree bending frequency is 8 or above, the tensile strength is 1500 MPa or above, and the ductility is 6% or above, the palladium alloy is subjected to pre-smelting and secondary smelting, and at least part of Cu and at least part of Cr in raw materials are mixed and pre-smelted to obtain a copper-chromium intermediate alloy; and the copper-chromium intermediate alloy and the remaining raw materials are mixed and then subjected to secondary smelting. The palladium alloy can meet the urgent requirements of probes in various forms on low resistance, high plasticity and toughness, fatigue resistance, mechanical strength and the like at the same time.

The invention provides an aluminum alloy material, a preparation method thereof and a cable. The aluminum alloy material is prepared from the following components in percentage by mass: 0.03 percent to 0.06 percent of Si, 0.80 percent to 1.2 percent of Fe, 0.15 percent to 0.25 percent of Cu, 0.005 percent to 0.03 percent of B, 0.001 percent to 0.02 percent of Ti, 0.05 percent to 0.15 percent of Y, 0.08 percent to 0.2 percent of the total mass of La and Ce and the balance of Al. The specific content of Fe is added into the aluminum alloy material and cooperates with the rare earth elements Y, La and Ce, and the elongation at break of the aluminum alloy material is improved; meanwhile, due to the addition amount of the Y element, the fatigue resistance of the material is further improved, the toughness of the material is improved, and the heat resistance and cold resistance of the material can be improved. A specific content of boron element is added to form nuclear particles, so that the effect of refining grains is achieved, and the tensile strength of the aluminum alloy material is improved; and meanwhile, the resistivity of the aluminum alloy material is further reduced through cooperation of the boron element and other components. And the titanium element can also play a role in refining grains, so that the tensile strength of the material is further improved. The cable prepared from the aluminum alloy material can meet the requirement of a cable torsion experiment.

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 a production method of thick-wall pipeline steel X65MS for polar regions, which adopts ultra-low carbon and high Ni + casting blank secondary cogging extreme cooling + steel plate online ultrafast cooling, breaks the component design of the conventional pipeline steel standard, solves the problem of poor drop hammer low-temperature toughness of thick-wall acid-resistant pipeline steel at-55 DEG C, and has the transverse and longitudinal yield strength of 460-560MPa, the tensile strength of 590-650MPa, the yield ratio of less than or equal to 0.80, the tensile strength of 590-650MPa and the tensile strength of less than or equal to 0.80. The uniform elongation is 10%-12%, the impact value at-55 DEG C is 400-500 J, and the drop weight at-55 DEG C is 90%-95%; when the product is soaked in an NACE solution for 96 hours in an HIC test, CLR, CTR and CSR are all 0; sSC test: four-point bending constant load nominal yield is 90%, and the sample is soaked for 720 hours, and the surface of the sample has no crack; the CTOD value of the crack tip opening displacement of the CTOD test material at-55 DEG C is greater than or equal to 0.6 mm.

The invention relates to a P690QL2 steel plate with ultrahigh die welding and low-temperature performance and a manufacturing method of the P690QL2 steel plate. The P690QL2 steel plate comprises the following chemical components in percentage by weight: 0.04%-0.12% of C, 0.02%-0.08% of Si, 1.0%-1.2% of Mn, 1.5%-2.5% of Ni, 0.3%-0.7% of Cr, 0.7%-0.9% of Mo, 0.07%-0.12% of V, 0.02%-0.04% of Ti, less than or equal to 0.002% of S, less than or equal to 0.002% of P, 0.03%-0.06% of Als and the balance of Fe and inevitable impurity elements. The steel plate is applied to the liquid cargo tank of the LCO2 transport ship, has high strength and low-temperature toughness requirements, is easy to weld and has ultrahigh die welding performance, the V-type impact energy of the steel plate at-60 DEG C is larger than or equal to 150 J, the CTOD at-55 DEG C is larger than 0.2 mm, and the machining and welding use requirements of pressure-bearing equipment are met.

The invention discloses a production method of 900 MPa-grade high-strength sucker rod round steel based on rare earth microalloying, and belongs to the technical field of steel and iron material production. A proper amount of rare earth elements are added into the steel, and the purification, modification and alloying effects of the rare earth elements are utilized, so that the inclusion form and distribution of the steel are improved, grains are refined, and the strength, toughness and corrosion resistance of the steel are improved; meanwhile, by reasonably controlling production process parameters of smelting, continuous casting, rolling, heat treatment and the like, the structure uniformity and the mechanical property stability of the steel are ensured. Compared with a traditional production method, the 900 MPa-grade high-strength sucker rod round steel produced through the method has higher strength and better toughness and corrosion resistance, and the requirement of the oil exploitation industry for high-end sucker rod materials can be met.

The invention belongs to the technical field of iron-based material preparation, and particularly relates to a method for optimizing soft magnetic performance of an iron-based amorphous alloy through cyclic stress annealing, the iron-based amorphous alloy and application. The method comprises the steps that periodic stress is applied to the iron-based amorphous alloy, and periodic strain is generated; the peak strain of the periodic strain is less than or equal to 2%, and the valley strain of the periodic strain is lower than the peak strain. Appropriate periodic stress is applied to the iron-based amorphous alloy at the low temperature, periodic strain is generated, the negative influence of rapid cooling on the soft magnetic performance during preparation of the iron-based amorphous alloy in the prior art can be improved, the brittleness problem generated by high-temperature annealing can be avoided, the soft magnetic performance and brittleness are better balanced, and the service life of the iron-based amorphous alloy is prolonged. And the effect of coexistence of ultralow coercive force and good toughness is achieved.

This invention discloses a stainless steel welding wire for repair welding of martensitic stainless steel turbine runners, its preparation method, and its application, belonging to the field of metal welding material preparation technology. The chemical composition of the welding wire provided by this invention, expressed as a percentage by weight, is: C≤0.03%, Si: 0%~0.6%, Mn: 5.0%~8.0%, S≤0.010%, P≤0.020%, Cr: 12.5%~15.5%, Ni: 5.0%~7.0%, Mo: 1.0%~2.0%, with the balance being Fe and impurities. The welding wire provided by this invention is suitable for repair welding of Cr13Ni4~6 type martensitic stainless steel, and post-weld heat treatment is not required. The weld metal produced by this welding wire exhibits good strength, plasticity, and toughness, with a tensile strength ≥750MPa, elongation after fracture ≥35%, and impact absorption energy at -40℃ ≥120J.

The invention discloses a high-hardness tungsten carbide-cobalt hard alloy and a preparation method thereof. A production raw material formula comprises the following components in parts by mass: 100 parts of tungsten carbide powder, 6-20 parts of cobalt powder, 0.2-1.3 parts of a composite sintering aid, 0.5-4 parts of a wet grinding medium and 0.2-4 parts of a forming agent, the composite sintering aid is composed of rare earth oxide and cobalt phosphide according to the mass ratio of (1-5): 1. The method has the advantages that on the premise that the toughness of the tungsten carbide-cobalt hard alloy is slightly improved, the hardness and wear resistance of the alloy are remarkably improved, and the industrial problems that the hardness improvement of the tungsten carbide-cobalt hard alloy with a single sintering aid is limited and the toughness of the alloy is lost are solved.

The invention belongs to the field of nickel-based alloy materials, and discloses a precipitation hardening type nickel-based alloy welding wire and a preparation method thereof.The precipitation hardening type nickel-based alloy welding wire comprises, by mass, 50%-60% of nickel, 15%-20% of chromium, 15%-20% of iron, 2%-4% of molybdenum, 2%-5% of niobium, 0.01%-2% of tantalum, 0.2%-2% of aluminum, 0.5%-1.2% of titanium, 0.03%-0.08% of carbon, 0.1%-0.5% of manganese, 0.1%-0.5% of silicon, 0.01%-0.05% of magnesium, 0.01%-0.05% of yttrium, 0.5%-2% of tungsten, 0.1%-0.6% of cobalt, 0.001%-0.02% of boron and the balance impurities; according to the precipitation hardening type nickel-based alloy welding wire and the preparation method thereof, through component optimization and process innovation, the nickel-based alloy welding wire with high-temperature strength, excellent hot crack resistance and welding toughness is provided.

The invention relates to the technical field of high-entropy ceramic preparation, and particularly discloses (TiZrNbHfTaV) C-SiC high-entropy composite ceramic as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing the (TiZrNbHfTaV) C-SiC high-entropy composite ceramic consisting of double phases of (TiZrNbHfTaV) C and SiC by adopting a rapid hot pressed sintering technology. The preparation process is simple and efficient, and large-scale industrial application is facilitated; the prepared multiphase ceramic is high in density, uniform in organization structure and reasonable in component design, the multiphase ceramic shows excellent mechanical properties, and the hardness, the fracture toughness and the wear rate are 34.00 GPa, 6.4 MPa.m < 1 / 2 > and 1.8 * 10 <-6 > mm < 3 > N <-1 > m <-1 > respectively. Compared with the traditional binary carbide ceramic, the (TiZrNbHfTaV) C-SiC high-entropy composite ceramic disclosed by the invention has excellent hardness and toughness, and the friction and wear properties are remarkably improved.

The invention relates to the technical field of material metallurgy, and discloses high-wear-resistance hot-rolled round steel for titanium-containing steel balls and a preparation method thereof.The round steel comprises 0.60%-0.67% of C, 1.40%-1.60% of Si, 0.70%-0.90% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.015% of S, 0.70%-0.90% of Cr, 0.10%-0.15% of Ti, smaller than or equal to 0.30% of Ni, smaller than or equal to 0.40% of Cu, smaller than or equal to 0.05% of Al, smaller than or equal to 0.0020% of O, smaller than or equal to 0.0002% of H and smaller than or equal to 0.0035% of N; and the balance of Fe and inevitable impurities. Through the high-titanium-low-nitrogen microalloying design, the technical contradiction that the toughness is remarkably reduced when the strength and the hardness of traditional high-carbon steel ball steel are improved is solved, and excellent synergistic improvement of the strength, the hardness and the toughness is achieved.

A 460 MPa-grade marine engineering steel having excellent fracture resistance and a manufacturing method therefor, said steel comprising: C: 0.05%-0.10%; Si: 0.15%-0.40%; Mn: 1.40%-2.00%; P≤0.008%; S≤0.002%; Cu: 0.15%-0.45%; Ni: 0.50%-1.00%; Cr: 0.15%-0.40%; Nb: 0.015%-0.05%; Ti: 0.007%-0.02%; Alt: 0.015%-0.055%; O≤0.001%; N≤0.005%; and the balance being Fe and unavoidable impurities, wherein Pcm≤0.24%. By means of optimization of raw material composition screening and proportioning, a preparation process, microstructure strength and toughness matching, etc., a 460 MPa-grade marine engineering steel having excellent fracture resistance and a maximum thickness of 100 mm is obtained.

The invention belongs to the technical field of material performance testing, and particularly relates to a simplified test method, a prediction method and a prediction system for the crack arrest toughness of a material, and the test method comprises the following steps: obtaining a crack arrest toughness sample containing precracks of a target material and physical parameters of the sample under preset conditions; the method comprises the following steps: under a preset condition, carrying out multiple loading and unloading crack arrest toughness tests on a sample in an incomplete unloading manner to obtain loading and unloading test data in each loading and unloading process, the loading and unloading test data comprising load data, crack opening displacement data, cyclic loading times and crack length data; according to a preset validity verification condition, performing validity verification on the obtained loading and unloading test data, and screening and determining key parameter data for calculating crack arrest toughness; calculating crack arrest toughness data according to preset conditions, the key parameter data and the physical parameters of the sample; the testing method is simple, low in cost and high in efficiency.

The present invention relates to the technical field of concrete. Disclosed is a toughening design method for fiber-reinforced concrete. The method of the present invention changes the passive control characteristics of fibers on a concrete crack propagation process in conventional fiber-reinforced concrete. Starting from the origin of composite material design, firstly, an ultrahigh-ductility composite cementitious matrix is designed; and secondly, an aggregate is incorporated. On the basis of a specific combination of matrix and aggregate parameters, a composite material develops meso-scale multiple cracking and strain-hardening behaviors between aggregate particles during external loading. The fiber-reinforced concrete prepared by this method actively disperses brittle damage and failure within the material, and avoids unstable crack propagation caused by weak interfacial bonding between the aggregate and the matrix. Compared to conventional fiber-reinforced concrete design methods, the present invention more accurately establishes relationships between material compositions, microstructures and macroscopic mechanical response, and more efficiently enhances the toughness of the material.

The invention provides a sorbite steel wire for a high-strength aluminum-clad steel wire, the chemical composition of the steel wire comprises, by mass, 0.75%-0.82% of C, 0.25%-0.35% of Si, 0.50%-0.60% of Mn, 0.20%-0.35% of Cr, 0.25%-0.45% of Ni, 0.10%-0.20% of Cu, 0.0005%-0.010% of B, 0.0007%-0.010% of P, 0.005%-0.008% of S, 0%-0.1% of Nb, 0%-0.10% of V, 0%-0.10% of Ti, 0%-0.01% of rare earth components and the balance Fe and inevitable impurities, the sorbite percentage of the sorbite steel wire for the high-strength aluminum-clad steel wire is larger than or equal to 97%, the the strength of the steel wire can be improved on the premise of not reducing the plasticity and toughness of the steel wire.

The invention discloses a V-B-Ti microalloyed 690 MPa grade steel for engineering machinery, and belongs to the field of metal processing. The steel comprises the following chemical components in percentage by weight: 0.13%-0.17% of C, 0.15%-0.25% of Si, 1.55%-1.7% of Mn, less than or equal to 0.02% of P, less than or equal to 0.015% of S, 0.017%-0.0250% of Ti, 0.1%-0.2% of Cr, 0.015%-0.045% of Als, 0.05%-0.08% of V, 0.0015%-0.0020% of B, 0.005%-0.0095% of N, 3.4%-3.8% of Ti / N and the balance of Fe and inevitable impurities, the total amount of other impurity elements is less than 0.05%, and the problems of low steel plate toughness and plate shape unevenness are solved.

The invention relates to 500MPa-grade preheating-free welding structural steel and a preparation method thereof, belongs to the technical field of structural steel, and solves the problems that in the prior art, traditional structural steel is poor in welding performance, high in carbon equivalent, high in cold crack sensitivity and difficult to consider both high strength and good plasticity. The structural steel comprises the following chemical components in percentage by weight: less than 0.002% of C, less than 0.02% of Si, less than 0.03% of Mn, 1.5-2.0% of Ni, 1.5-2.0% of Cu, less than 0.0008% of S, less than 0.006% of P and the balance of Fe and inevitable impurities, wherein the carbon equivalent Ceq is less than or equal to 0.27. The combination of high strength (the yield strength is larger than or equal to 550 MPa, and the tensile strength is larger than or equal to 650 MPa), excellent welding performance (Pcm is smaller than or equal to 0.14), good plasticity (the percentage elongation after fracture is larger than or equal to 25%, and excellent low-temperature toughness (the impact energy at the temperature of-20 DEG C is larger than or equal to 200 J) is achieved, and the steel is suitable for the structural fields of ships, bridges, buildings and the like with strict requirements for welding performance and mechanical performance.

The present application relates to a kind of large thickness submarine pipeline steel plate and its production method, by the optimization design steel plate component of low-carbon low-alloy component, production method is with the special controlled rolling process of five-stage heating+recrystallization zone low temperature large reduction rolling+intermediate billet instant cooling+non-recrystallization zone high temperature large reduction rolling, and the multi-stage controlled cooling process of high temperature zone air cooling redistribution+ferrite zone cooling+waiting temperature+bainite zone cooling+air cooling self tempering cooling.The product steel plate of the present application has higher acicular ferrite proportion, and the average grain size of ferrite is finer, 3~6 μm, so that the steel plate has good strength and toughness match, the steel plate has higher strength, yield strength ≥500MPa, tensile strength ≥630MPa, and impact energy KV2 At-60 ℃, ≥250J.

The present invention belongs to the technical field of composite material processing, and relates to a hole making tool for aramid fiber-reinforced plastic and a design method thereof. The drill bit has a step reversed point angle structure, which can reduce a trust force during drilling and effectively cut off a high toughness aramid fiber, thus to improve the hole making quality of an AFRP-related component. It is proved that the new tool can significantly improve the hole making quality of an AFRP component, improve the service life and safety degree, and greatly reduce the processing cost. Therefore, the present invention has a broad application prospect in the fields of aerospace, military industries and civil application.

The invention relates to the technical field of low-carbon microalloyed steel production, in particular to economical thin L450M pipeline steel and a method for controlling a banded structure, the steel comprises the following chemical components in percentage by weight: 0.07%-0.09% of C, 0.10%-0.25% of Si, 1.70%-1.80% of Mn, less than or equal to 0.020% of P, less than or equal to 0.015% of S, 0.01%-0.02% of Nb, 0.008%-0.015% of Ti, 0.015%-0.04% of Al, 0.05%-0.15% of Cr, 0.003%-0.006% of N and the balance of Fe and inevitable impurities, and the total amount of impurity elements is less than 0.05%; the steel plate produced by the invention has the advantages of low cost, high strength and toughness, low yield ratio and high straightness, and can ensure the service safety of the gas transmission pipeline.

The invention relates to a pipeline steel ring welding seam toughness evaluation method based on fracture morphology fractal reconstruction. The method comprises the following steps: firstly, preparing an SENB / CT sample according to ASTME 1820 and other standards, completing a fracture toughness test, and calculating to obtain JIC or KIC; performing three-dimensional point cloud acquisition on the fracture of the fractured sample by using a non-contact laser scanning system with the resolution of less than or equal to 1 mu m, denoising, splicing and registering to obtain the three-dimensional shape of the fracture, and extracting the arithmetic mean roughness Sa; and performing fractal analysis on the reconstructed morphology by adopting an improved box counting method, and calculating fracture fractal dimension Df. And constructing a multivariate nonlinear prediction model by taking a toughness parameter as a dependent variable and taking fracture morphology characteristic characterization parameters Sa and Df as independent variables, and accurately evaluating the fracture toughness of the pipeline steel ring welding seam when a decision coefficient R2 is greater than or equal to 0.90. The method has the advantages of less sample demand and short analysis period, can quantitatively evaluate the fracture toughness of the material from the morphological characteristics of the fracture, obviously reduces the detection cost, improves the in-service pipeline integrity evaluation efficiency, and is suitable for rapid toughness prediction of circumferential weld materials of different steel grades and welding processes.

The invention discloses a method for predicting dynamic mechanical properties of a tough difficult-to-machine material based on milling. The method comprises the following steps: firstly, optimizing and solving a normal shear angle of an oblique angle cutting shear plane through an iterative method: (a) setting an initial value of the normal shear angle; (b) calculating an undeformed chip thickness, a cutter instantaneous invasion angle, a cutting force component and a normal friction angle based on the normal shear angle initial value; (c) updating a normal shear angle calculation value; (d) calculating the error between the initial value and the calculated value of the normal shear angle, if the error is not within the allowable range, repeating the steps (a)-(d) until the error is within the allowable range, and outputting the final calculated value as the optimized normal shear angle; then, parameters such as the optimized normal shear angle are substituted into a related equation containing fracture toughness, yield strength and viscous toughness to solve the fracture toughness Gc of a workpiece material at a tool nose in the milling process, the yield stress sigma Y in a shear plane and the viscous toughness Ga of chip slippage at a tool-chip contact interface.

The invention belongs to the technical field of steel materials, and particularly relates to powder for metal injection molding, electronic equipment, a steel structural part and a preparation method of the powder for metal injection molding, and the powder for metal injection molding comprises the following elements of, by weight, 16.01%-16.99% of Co, 7.31%-8.40% of Cr, 5.65%-6.65% of Mo, 7.01%-7.99% of Ni and 0.20%-0.40% of Nb. And the weight percentage of Fe is greater than or equal to 59.57%. By the adoption of the powder for metal injection molding, preparation of a high-strength and high-toughness steel structural part with the yield strength not lower than 2000 MPa and the elongation not lower than 5% can be achieved.

The invention discloses a method and application for ultrasonic-assisted laser additive manufacturing of a multi-scale structure coupling high-toughness aluminum alloy, and the method comprises the steps that high-Ni-content alloy steel powder is refined through high-energy ball milling, and then the refined alloy steel powder is dispersed and distributed in Al-Mg-Sc-Er-Zr alloy powder; an ultrasonic energy field is introduced to assist selective laser melting to form mixed powder, the ultrasonic energy field assists in generating nonlinear effects such as cavitation, acoustic streaming and heat effect, defects such as air holes and cracks are overcome to eliminate residual stress, and the Marlangoni effect is accelerated to increase the solidification speed; and finally, the high-strength and high-toughness aluminum alloy which has high density and is composed of micron-scale, submicron-scale and nano-scale multi-scale phase structures is prepared. The production cost is low, and the room-temperature tensile properties of the prepared high-strength and high-toughness aluminum alloy are as follows: the strength is greater than 850 MPa, and the fracture strain is greater than 6%.

The invention relates to the technical field of powder metallurgy materials, and discloses a binding-phase-free hard alloy and a preparation method thereof.The binding-phase-free hard alloy comprises, by mass, 75-80 parts of WC; 8 to 12 parts of TiC; 5 to 8 parts of TaC; 3 to 5 parts of ZrC; 1.5 to 2.5 parts of HfC; 0.8 to 1.2 parts of rare earth oxide; the preparation method comprises the five key steps of core-shell structure composite powder preparation, high-energy beam melting gradient accumulation, microwave-magnetic field composite field activation, multi-stage pressure plasma sintering and staged variable-rate gradient cooling. And component gradient design is cooperated with a multi-field coupling process. Through collaborative design of a core-shell structure hard phase and a gradient composite phase, and in combination with a multi-field coupling activated sintering and gradient cooling process, the problem of obdurability balance of the non-binding-phase hard alloy is solved, the microstructure stability is optimized, and the comprehensive performance and the process controllability are improved.