2226 results about "Hardness" patented technology

Provided is a high-strength steel sheet having excellent member strength, ductility, stretch flangeability, bendability of a shear end surface, and low-temperature toughness. A high-strength steel sheet having a prescribed component composition and a steel structure in which the area ratio of martensite is 10%-80%, the area ratio of bainite is 2%-70%, the area ratio of ferrite is 80% or less, and the area ratio of retained austenite is 15% or less at a position at 1 / 4 of the sheet thickness. The ratio of the number of martensite blocks in which metastable carbides are present relative to the number of martensite blocks is 2% or more, and the standard deviation [sigma] n of the nano-hardness relative to the average value [Hn] ave of the nano-hardness is 0.60 x [Hn] ave or less when the nano-hardness at 225 points or more is measured at a position of 1 / 4 of the sheet thickness.

The invention discloses a powder metallurgy gear hardness detection method and system, and belongs to the technical field of metallurgy gears, and the method comprises the steps: obtaining a to-be-detected gear three-dimensional model, and dividing a hardness evaluation region; a thermal response image is collected, a thermal response time gradient parameter TRTG is extracted, and a thermal diffusion characteristic matrix T is formed; establishing a hardness initial model H1 based on the TRTG and compactness; constructing a finite element stress field model, extracting a stress distribution modulation coefficient SDMC, and forming a stress characteristic matrix S; performing weighted correction on H1 based on T and S, and establishing a comprehensive hardness prediction model H2; outputting a hardness prediction result of the whole gear and the key area, and identifying a potential weak area; according to the method, thermal response and stress modulation parameters are fused, non-destructive and high-resolution hardness distribution prediction is achieved, and the method is suitable for quality evaluation and failure early warning of the powder metallurgy gear of a complex structure.

The invention discloses a control method applied to self-piercing riveting, and relates to the technical field of self-piercing riveting control. According to the method, riveting material data are collected in real time through a multi-source data fusion interface, the high-dynamic deformation process of a riveting head is captured, deformation rate and rebound value characteristic values are extracted, and a multi-dimensional process parameter set is constructed. And comprehensively analyzing the hardness, thickness and plastic dissipation characteristics of the material, and establishing an anti-deformation capability evaluation function. By introducing the fluctuation characteristics of the punching force, the nonlinear relation between the punching force and the elastic deformation of the riveting rod is analyzed, a hybrid compensation model is constructed, and a riveting dynamic coupling compensation vector is output. And generating a compensation weight matrix through an adaptive optimization algorithm, and dynamically adjusting the stamping force and the displacement of the riveting rod in combination with an anti-saturation control strategy. And dynamically adjusting a gain parameter through multi-scale filtering and a Lyapunov stability criterion, and triggering iterative updating of a compensation weight parameter during out-of-tolerance so as to optimize a control effect. Riveting precision and stability are improved, and the service life of equipment is prolonged.

The invention discloses a rock crack evolution numerical simulation method based on data analysis, and relates to the technical field of rock mechanics engineering numerical simulation, and the method comprises the following steps: S1, obtaining microstructure data of a target rock, including a CT scanning image, an SEM image and mineral energy spectrum data; and S2, constructing a spatial distribution dynamic mechanical parameter field based on the microstructure data. According to the rock crack evolution numerical simulation method based on data analysis, a dynamic mechanical parameter field driven by a microstructure is constructed, so that the inherent defect that rock is simplified into a homogeneous material in a traditional method is overcome; microscopic characteristics such as mineral hardness gradient, grain boundary strength distribution and pore morphology are effectively quantified into an elastic modulus field, a tensile strength field and a fracture energy field which are spatially distributed, so that the numerical prediction of crack initiation and expansion truly reflects the inherent heterogeneity of the rock for the first time.

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 laser cladding preparation method for improving the wear resistance of a cladding layer by doping tungsten carbide. According to the method, cladding process parameters are preliminarily obtained based on finite element heat flow analogue simulation, cladding layer preparation is carried out, cladding quality characterization is carried out to obtain the optimal cladding process parameters, and finally the cladding layer with the wear-resistant characteristic is obtained. The method comprises the following steps: firstly, constructing a heat flow coupling three-dimensional model, carrying out grid division, establishing a heat source model, defining thermophysical parameters of tungsten carbide (10-15%) nickel alloy composite powder and a matrix, and determining simulated boundary conditions; setting a multi-factor process parameter combination to carry out numerical simulation calculation, and determining laser processing process parameters of laser power, scanning speed and light spot diameter; preparing a cladding layer on the surface of the nodular cast iron by using tungsten carbide (10-15%) nickel alloy composite powder through a laser cladding method; and carrying out microscopic morphology and microhardness experiments to carry out quality analysis verification on the cladding layer, determining the optimal process parameters of laser power, scanning speed and light spot diameter when the cladding layer has no obvious defect morphology and the hardness is higher than that of the raw material, and obtaining the laser cladding preparation method for improving the wear resistance of the cladding layer by doping tungsten carbide. The invention provides a new research method and a high-quality preparation approach for improving the wear resistance of the cladding layer by tungsten carbide, and can be widely applied to the fields of strengthening and repairing mining machinery, aerospace parts and the like.

The invention discloses a microcrystalline aluminum alloy and a preparation method and application thereof, and belongs to the technical field of microcrystalline aluminum alloy material preparation. The microcrystalline aluminum alloy disclosed by the invention comprises Al and the following components in percentage by weight: 0.5 to 4.0 percent of Si, 0.5 to 4.5 percent of Mg, 0.5 to 5.0 percent of Fe, 0.5 to 6.0 percent of Cu, 0.5 to 8.0 percent of Ni, 0 to 5.0 percent of Mn, 0 to 4.0 percent of Mo, 0 to 4.0 percent of Zr and inevitable impurities. The grain size of the microcrystalline aluminum alloy is smaller than 5 microns, the hardness is larger than or equal to 150 HB, the room-temperature tensile strength is larger than or equal to 450 MPa, the high-temperature tensile strength (200 DEG C) is larger than 200 MPa, and the flatness is smaller than or equal to 5 microns.

A tool includes a cemented carbide part and a maraging steel part, wherein the two parts are joined by brazing. The cemented carbide part has a hard phase embedded in a metallic binder phase matrix. The maraging steel part has a hardness of between 350 and 600 HV1 with a standard deviation between 0 and 20 HV1. A method of making such tool is also provided.

The invention relates to the technical field of anti-fatigue of steel parts, and discloses an anti-fatigue system and method for a high-hardness steel part based on ultrasonic-shot blasting composite strengthening. The method comprises the steps that the macroscopic geometrical morphology, the microstructure and the dynamic stress-strain data of a target steel part are collected through a multi-mode sensing system, and a multi-physics field digital twinborn model is constructed through fusion; on the basis of fatigue damage feature distribution in the model, sorting by using an enhanced decision tree model, and triggering parameter configuration by using a priority over-critical value; synchronously calculating ultrasonic field regulation and control parameters and shot blasting trajectory planning parameters through an adaptive neural network algorithm; the parameters are injected into a digital twin model to simulate material response and energy transfer, data such as a microdefect closed state are output, and a parameter correction signal is generated through multi-dimensional consistency inspection. According to the method, precise control over composite strengthening is achieved, and the anti-fatigue performance of the high-hardness steel part is effectively 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.

The invention relates to the technical field of high-hardness thick-specification high-wear-resistance steel plates, in particular to a high-hardness 30-80mm thick-specification flame-cutting-delayed-crack-free high-wear-resistance steel plate and a production method thereof. New flame cutting delayed crack preventing components and process design are adopted, the chemical components of the steel plate are mainly characterized by medium carbon, high silicon and niobium microalloying, and the wear-resistant steel plate with low impurity content, uniform and fine martensite and a certain amount of retained austenite structures is obtained after refining, continuous casting, controlled rolling and heat treatment. And formation and expansion of delayed cracks during flame cutting can be inhibited. And during flame cutting, thermal stress and structural stress formed in the cutting process of the thick steel plate are reduced through the cutting process of cutting with temperature and slow cooling with hot water after cutting, and the effect of no delayed crack after cutting is achieved. The surface hardness is larger than or equal to HB500, the tensile strength is larger than or equal to 1350 MPa, AKV at-40 DEG C is larger than or equal to 30 J, A is larger than or equal to 10%, retained austenite is 4%-6%, delayed cracks do not exist after flame cutting, and the flame cutting edge hardness is larger than or equal to HB460.

The invention relates to the technical field of polymer foam materials, in particular to a preparation method of gradient cross-linked pearl wool microcellular foamation.According to a gradient cross-linked network constructed through a two-stage cross-linking technology, collaborative optimization of the performance of a surface layer and the performance of a core part of the material is achieved, a compact three-dimensional net-shaped structure is formed in a high-cross-linking-degree area of the surface layer, and the core part of the material is expanded; the surface hardness, wear resistance and tear resistance of the material are remarkably enhanced, external impact and friction damage are effectively resisted, the low-crosslinking-degree area of the core part retains the moderate movement capacity of a polymer chain, the material is endowed with excellent energy absorption characteristic and flexibility, and the material has good mechanical properties when bearing complex stress. Stress dispersion can be achieved through surface layer-core part synergistic deformation, fracture failure caused by local stress concentration is avoided, meanwhile, a gradient cross-linked network provides a controllable melt strength gradient field for supercritical fluid foaming, and therefore accurate control over the size and distribution of foam holes is achieved in the single-time foaming process.

The present invention provides a steel sheet having high strength and high ductility, and a method for manufacturing the same.　The steel sheet has a specific component composition and a structure mainly composed of ferrite. The amount of N present as AlN and the total amount of N satisfy relational expression (1), and the amount of Nb present as Nb precipitates and the total amount of Nb satisfy relational expression (2). The yield strength is 500 MPa or greater, the HR30T hardness is 66 or greater, and the total elongation is 7.0% or more. (1): (Amount of N present as AlN) / (total amount of N) ≤ 0.40 The total amount of N is the amount of all N included in the steel sheet. (2): 0.10 ≤ (amount of Nb present as Nb precipitates) / (total amount of Nb) ≤ 0.80 The total amount of Nb is the amount of all Nb included in the steel sheet.

The bainite plastic die steel comprises the following components in percentage by mass: 0.01-0.15% of C, 0.25-1.0% of Si, 0.5-2.0% of Mn, less than or equal to 0.045% of P, less than or equal to 0.015% of S, 2.0-5.0% of Cr, 1.01-2.0% of Ni, 0.0010-0.0050% of B, 0.004-0.008% of N and the balance of Fe and other inevitable impurities, and the following requirements are simultaneously met: the hardness index is more than or equal to 28 and less than or equal to 13.8 + 132.8 C + 2.34 Mn + 1.84 Cr-1.12 Ni and less than or equal to 38, and the bainite index is C 0.5 * Mn 1.4 * Cr 4 * Ni * N-1. 05 / 20 and less than or equal to 2000. According to the die steel, the tensile strength is larger than or equal to 800 MPa, the hardness is 28-38 HRC, the hardness difference value of the section of a steel plate with the thickness of 15-300 mm is smaller than or equal to 2 HRC, the straightness is smaller than or equal to 2 mm / m, and the flaw detection quality meets the E / e level requirement in the SP1921-84 standard. The method can be applied to manufacturing of plastic parts in the fields of automobiles, household appliances, medical treatment, electronics and the like.

The invention provides a setter plate for sintering a powder metallurgy product and a preparation method of the setter plate, and belongs to the technical field of setter plates. The refractory material is prepared from the following raw materials in parts by weight: 20-40 parts of fused zirconium mullite, 20-40 parts of modified sintered corundum, 30-50 parts of alumina micro powder, 0.5-1 part of yttrium oxide / alumina-carbon nanotube hollow microsphere powder, 0.5-1 part of zinc oxide micro powder and 5-10 parts of a binder. The setter plate for sintering the powder metallurgy product has the advantages of good heat insulation, high temperature resistance, thermal shock resistance and chemical stability, good mechanical properties, good hardness and good wear resistance, the problems of cracking, deformation and the like caused by thermal shock are reduced, the service life of the setter plate is prolonged, and the setter plate has a wide application prospect.

The invention relates to the field of ferrous metallurgy and forge piece manufacturing, in particular to high-toughness, ultra-pure and large-quenching-depth 40CrNiMoRE rare earth special steel for a large ring piece and a preparation method of the high-toughness, ultra-pure and large-quenching-depth 40CrNiMoRE rare earth special steel. The invention relates to a high-temperature-resistant steel material, which comprises the following chemical components in percentage by weight: 0.3 to 0.5 percent of C, 0.1 to 0.5 percent of Si, 0.4 to 0.8 percent of Mn, 0.5 to 1.5 percent of Cr, 0.5 to 1.5 percent of Ni, 0.1 to 0.5 percent of Mo, 0.05 to 0.30 percent of V, 0.0005 to 0.0030 percent of B, 0.005 to 0.030 percent of RE and the balance of Fe and inevitable impurities. Through V, B and RE comprehensive microalloying, molten steel purification, inclusion modification and grain refinement, the hardenability is improved, and the surface quenching layer depth, hardness uniformity and impact toughness are ensured. And moreover, the high-toughness, ultra-pure and large-quenching-depth large ring piece is obtained through preparation technologies such as pure smelting, airtight protection pouring and uniform deformation, and the technical problems that an existing large ring piece is low in purity, poor in toughness, insufficient in hardenability, cracked in surface quenching and the like can be effectively solved.

The invention belongs to the technical field of ferrous metallurgy and high-strength wear-resistant materials, and discloses large-thickness high-toughness NM550 wear-resistant steel and a preparation method thereof. Nb, Ti and V are cooperated according to the mass ratio of 1: 1: 2 to form a multi-element nano carbide (Nb, Ti, V) C main strengthening phase with the average particle size of 5-50 nm; in the controlled rolling and austenitizing stages, Cr and Mo elements form fine carbides, a main strengthening phase is induced to be separated out preferentially, and cluster aggregation is prevented; al initial deoxidation and Ce and Ca composite denaturation treatment are adopted to form spherical Ce-Ca-Al-O composite oxide inclusions, and the average particle size is smaller than or equal to 2 microns. By adopting clean smelting, uniform-temperature heating, temperature-controlled rolling, three-stage flow-regulating water cooling and two-stage tempering treatment, uniform regulation and control and multi-scale strengthening of the structure are realized. The yield strength is greater than or equal to 1400 MPa, the tensile strength is greater than or equal to 1850 MPa, the ductility is greater than or equal to 15%, the ballistic work at-20 DEG C is greater than or equal to 40 J, and the surface hardness is greater than

The present invention discloses a fine-grained, high-hardness and toughness martensitic wear-resistant cast steel and its preparation method and application, belonging to the technical field of wear-resistant cast steel and its heat treatment. The chemical composition of the fine-grained, high-hardness and toughness martensitic wear-resistant cast steel is, by mass percentage, C: 0.45-0.65%, Si: 0.5-2.0%, Mn: 0.4-1.0%, Cr: 0.6-1.4%, Ni: 0.3-1.2%, Mo: 0.2-0.7%, Zr: 0.01-0.06%, P≤0.032%, S≤0.040%, the balance being Fe and unavoidable impurities, 5.5×10 ‑7 ≤[Zr][C]wt%≤35×10 ‑7 The present invention optimizes the alloy composition and heat treatment process and utilizes liquid precipitation Zr (C, N) to refine the grains. The high-hardness and toughness martensitic wear-resistant cast steel obtained is particularly suitable for the preparation of wear-resistant parts under medium and low stress impact abrasive wear conditions.

The invention belongs to the technical field of tool wear measurement, and particularly relates to a machining center tool wear state early warning method based on multi-source data fusion, and the method comprises the steps: calculating a cutting power consumption characteristic through a main shaft load energy mapping model according to the original sampling current and the real-time feeding speed of a main shaft; sliding window sampling is carried out on the cutting power consumption characteristics, and the cutting state disorder degree is calculated; performing nonlinear coupling on the power consumption gradient item and the cutting state disorder degree to obtain a grinding loss stability coefficient; and establishing a dynamic statistical reference surface, and performing cutter state early warning according to the deviation degree of the grinding loss stability coefficient monitored in real time. Instantaneous interference caused by uneven material hardness is effectively recognized and eliminated, meanwhile, signal structure disorder at the initial stage of tool failure is captured, the technical problems that in die steel machining, due to material structure segregation and variable working conditions, the false alarm rate is high, and failure precursor capturing is difficult are solved, and the machining precision is improved. And the monitoring accuracy of the precision machining process is obviously improved.

The invention discloses a method for detecting tissue evolution in a heating process after quenching of tool steel based on saturation magnetization, resistivity and hardness, and relates to the technical field of metal material detection.The method comprises the steps that heating parameters are set for different types of tool steel, and an actual tempering process is simulated; then, the saturation magnetization intensity, the resistivity and the hardness are measured through professional equipment, and data are obtained through accurate measurement and scientific calculation; and then, sorting the data to establish a database, analyzing by using a multiple linear regression model, and judging an organization evolution stage according to a preset result range. According to the method, the structure evolution of the tool steel can be accurately and comprehensively monitored, the detection accuracy and scientificity are improved, powerful support is provided for quality control and process optimization in the tool steel production process, and the tool steel product performance and production efficiency are effectively improved.

The invention relates to the technical field of cutting tools, and discloses a high-strength wear-resistant cutting tool and a preparation method thereof.The high-strength wear-resistant cutting tool is prepared from, by weight, 85-89.5 parts of tungsten carbide nanometer powder, 9-12 parts of cobalt powder, 0.5-1 part of chromium carbide, 1-2 parts of tantalum powder and 0-0.5 part of molybdenum powder, and the particle size range of the tungsten carbide nanometer powder is 50-100 nm. The synergistic effect of the tungsten carbide nano powder and the gradient cobalt content is accurately controlled, breakthrough improvement of the performance of a base material is achieved, the gradient structure design enables the surface layer of the material to obtain high hardness, meanwhile, the core part keeps fracture toughness, and the technical problem that a traditional homogeneous material cannot give consideration to high hardness and high toughness is solved. And the cutting tool can adapt to wider machining working conditions and material types.

The invention discloses equipment and a method for automatically detecting the hardness of a gypsum plaster board, and relates to the field of building material detection equipment. The automatic detection equipment for the hardness of the gypsum plaster board comprises a supporting assembly, the supporting assembly comprises a base and supporting columns, and the supporting columns are arranged at the two ends of the top face of the base; the fixing assembly is arranged on the top surface of the base, and the fixing assembly comprises a plurality of clamping pieces; the steel needle assembly comprises a plurality of steel needles and force value sensors, the force value sensors are arranged on the steel needles, the number of the steel needles is the same as that of the clamping pieces, and the steel needle assembly is movably arranged on the supporting column through a lifting assembly. The multiple samples are fixed to the base through the clamping pieces, the positions of the samples and the positions of the steel needles are adjusted so that the steel needles can be located over the preset measuring points of the corresponding samples, and finally the steel needles are driven by the lifting assembly to be inserted into the samples by the preset depth. According to the automatic detection equipment for the hardness of the gypsum plaster board, the time required for testing the hardness of the gypsum plaster board is shortened.

The invention discloses a medium-entropy (Zr, Ta, W) C coating and a preparation method and application thereof. The medium-entropy (Zr, Ta, W) C gradient coating is prepared on the surface of the titanium alloy or the iron-based alloy through the double-layer glow plasma surface metallurgy technology, and gradient temperature annealing treatment is conducted. The preparation method has the specific advantages that (1) the prepared coating is of a continuous gradient structure, good interface metallurgical bonding is formed between the coating and a matrix, the bonding force of the coating is not lower than 50 N, and the coating is not prone to cracking and stripping in the service process due to the high bonding strength; and (2) the hardness of the medium-entropy (Zr, Ta, W) C coating prepared by the method is 25-30 GPa, the fracture toughness is 4.0-5.0 MPa * m < 1 / 2 >, and the coating system has balanced hardness and toughness, so that the coating is endowed with excellent wear resistance. The prepared coating has excellent wear resistance and antifriction performance, and has wide application prospects in the field of wear-resistant protective coatings.

The invention relates to the technical field of material mechanical property testing, and discloses a material indentation and scratch testing device and method under a composite energy field, and the device comprises a supporting experiment table, a vertical micro-motion platform, a horizontal micro-motion platform, a high-definition optical microscope, a force sensor, a displacement sensor and an additional energy field generation system. According to the method, a controllable additional energy field is synchronously applied while a mechanical indentation or scratch load is applied to a hard and brittle material sample, and load displacement data is collected in real time. In the data processing stage, the real hardness is calculated by adopting a corrected proportion sample resistance model, the elastic modulus is calculated based on the Oliver-Pharr theory, and the fracture toughness of the material is analyzed and calculated according to the size of the indentation tip crack. The problem that in-situ mechanical property characterization cannot be carried out in a composite energy field in a traditional test is solved, the hardness calculation precision is improved, the fracture toughness measurement function is expanded, and the experimental device and method are provided for research of a hard and brittle material composite machining mechanism.

The invention relates to the technical field of rubber paint, in particular to rubber paint with good wear resistance and a preparation method thereof. The rubber paint is prepared from the following raw materials in parts by weight: 60-80 parts of chlorinated rubber, 30-50 parts of solvent, 20-40 parts of alkyd resin, 10-20 parts of polytetrafluoroethylene resin, 6-10 parts of epoxy resin, 6-10 parts of filler, 4-6 parts of additive, 2-4 parts of flatting agent, 1-3 parts of ultraviolet light absorber, 1-3 parts of dispersing agent and 1-3 parts of defoaming agent. According to the rubber paint, fluorosilane has the characteristic of low surface energy, a molecular layer with low surface energy can be formed on the surface of the rubber paint, the friction force borne by the surface of the rubber paint is small due to the low surface energy, the wear resistance of the rubber paint is improved, tetraethyl orthosilicate and ammonia water are matched to generate a hydrolytic condensation reaction, and silicon dioxide nanoparticles are generated; inorganic rigid components in the rubber paint are further increased, so that the overall hardness and wear resistance of the rubber paint are enhanced.

A rolling method for reducing a carbide network rating of high-carbon chromium bearing steel, sequentially comprising: billet heating, descaling, rough rolling, intermediate rolling, controlled rolling, intermediate material segmentation, finish rolling, controlled cooling, and cooling on a cooling bed. By improving the rolling process and using a "segmentation before cooling" method to adjust the rolling procedure, the problems that the temperature is too low due to water quenching after rolling, the hardness of a rolled material is high, and normal operation of a shearing device cannot be guaranteed are solved, and the effect of reducing the carbide network rating is achieved, thereby avoiding the additional work procedures and costs caused by the non-compliant carbide network of the rolled material.

The invention discloses a compression molding method of a thick-wall super duplex stainless steel end socket, which comprises the following process steps: designing and determining the size, shape and material thickness of a container, marking, blanking, carrying out punch molding on a material sheet by using a punching grinding tool, carrying out solid solution, and carrying out compression molding on the material sheet to obtain the thick-wall super duplex stainless steel end socket. Wherein the punch forming process and the solid solution process are specially applicable to the process for manufacturing the end socket by using the thick-wall super duplex stainless steel, the forming quality can be improved, and the quality and the performance of the end socket are ensured by strictly detecting and controlling the process flow; the problems that the end socket cracks and is scrapped due to a traditional forming mode and ferrite and hardness cannot meet the requirements are solved, the manufacturing period can be shortened, and material loss and labor cost can be reduced.

The present invention discloses a twinned and dispersion-strengthened WC-Ni-based cemented carbide and its preparation method. The alloy is composed of a hard phase component WC, a bonding metal Ni, and supersaturated composite grain growth inhibitors Cr3C2 and VC. The WC hard phase in the alloy is composed of irregular grains with an average grain size of less than 0.5 μm and dispersed small plate-like grains. The typical morphological characteristics of the fine plate-like WC grains in the polished cross-section of the alloy are long strips with an average length of less than 2.2 μm and an average width of less than 0.5 μm. Nano-dispersed phases exist in the Ni-based bonding phase solid solution matrix in the alloy. The present invention uses unsaturated carbon nano-WC powder as raw material, and through ultrafine grain strengthening of the hard phase, strengthening of dispersed fine plate-like crystals, and nano-dispersed phase strengthening of the bonding phase, the alloy is given high hardness, high toughness, and high strength.

The invention discloses a preparation method and an outer-layer material of a composite cold roll, and belongs to the technical field of rolls, and the preparation method comprises the following steps: S1, preparing steel raw materials according to chemical components and weight percentage contents in the outer-layer material of the composite cold roll, and preparing an outer-layer steel ingot according to a smelting procedure production process; s2, the outer-layer steel ingot is manufactured into an outer-layer roller blank according to the forging procedure production technology, and a mandrel roller blank is manufactured according to the mandrel steel ingot according to the forging procedure production technology; s3, the outer-layer roller blank and the mandrel roller blank of the composite cold roller are combined, and a composite cold roller blank is obtained; and S4, the roller blank is machined, and the composite cold roller is obtained. The composite cold roll has good hardness retentivity, structure uniformity and manufacturability, meanwhile, the abrasion resistance, obdurability and structure uniformity of the working layer of the composite cold roll are improved, the comprehensive use effect of the composite cold roll in the whole service period is improved, the steel rolling production efficiency is improved, and the production cost is reduced. And the consumption of the outer layer of the composite cold roll is reduced.

The invention provides a magnesium aluminate spinel-CMA multiphase material and a preparation method thereof, and belongs to the field of refractory materials. The refractory material comprises the following raw materials in percentage by mass: 80-87% of Al2O3, 6-19% of high-calcium magnesia and 1-7% of CaO. The mass percentage of the binding agent is 1-6% of the sum of the raw materials. The magnesium aluminate spinel-CMA multiphase material with excellent performance is synthesized from low-grade high-calcium magnesia, CMA large grains are tightly wrapped by magnesium aluminate spinel small grains, and a CMA phase and a magnesium aluminate spinel phase are uniformly distributed, so that the magnesium aluminate spinel-CMA multiphase material has the advantages of magnesium aluminate spinel and CMA materials, namely the magnesium aluminate spinel-CMA multiphase material has the characteristics of high hardness, wear resistance, thermal shock resistance, erosion resistance and the like.