168 results about "Solid solution strengthening" patented technology

The invention discloses a nickel-based single-crystal high-temperature alloy with high structure stability and a preparation method thereof, and relates to the technical field of high-temperature alloys. The nickel-based single crystal high-temperature alloy provided by the invention is prepared from the following components in percentage by mass: 5 to 7 percent of Al, 7.5 to 10 percent of Co, 5 to 7 percent of Cr, 0.1 to 0.2 percent of Hf, 0 to 2 percent of Mo, 5.5 to 7.5 percent of Ta, 0 to 1 percent of Ti, 8 to 10 percent of W, 0.02 to 0.05 percent of C, 0.003 to 0.005 percent of B and the balance of Ni. According to the invention, by controlling the ratio of elements and avoiding the addition of Re, the precipitation temperature of a harmful TCP phase is obviously reduced to about 840 DEG C on the basis of maintaining a sufficient solid solution strengthening effect, and the long-term stability of the structure is greatly improved. The high-temperature mechanical property of the alloy provided by the invention reaches the level equivalent to that of a traditional Re-containing second-generation single-crystal alloy and is remarkably superior to that of foreign Re-free single-crystal alloys MD2 and Rene N500, and the nickel-based single-crystal high-temperature alloy with high structure stability successfully realizes the unification of low cost and high performance, and is suitable for industrial production. And a reliable material solution is provided for manufacturing the heavy-duty gas turbine blade with higher market competitiveness.

The invention discloses round steel for a phi 300mm large-specification petroleum valve body and a production method of the round steel. The round steel comprises the following chemical components in percentage by weight: 0.17%-0.20% of C, 0.20%-0.30% of Si, 1.23%-1.35% of Mn, 0.015%-0.030% of Al, 0.005%-0.015% of V and the balance of iron and inevitable impurities. On the basis of solution strengthening of C and Mn, V, Al and other fine-grain alloy elements are designed and added, dispersed precipitation of carbon and nitride fine particles and solution strengthening of the V and Al elements are achieved through controlled rolling to refine grains, the strength and toughness of the round steel are greatly improved, it is guaranteed that the grains are fine, and the normalized V-type-50 DEG C low-temperature impact of the round steel is larger than 100 J; and the grain size in the hot rolling state is 6.5-7.0 grade, and the requirements of downstream customers can be completely met.

The invention discloses high-endurance-strength high-silicon martensite heat-resistant steel for a lead-bismuth reactor and a preparation method of the high-endurance-strength high-silicon martensite heat-resistant steel, and belongs to the technical field of corrosion-resistant and heat- The heat-resistant steel comprises C, Si, Cr, Ni, Mo, W, Mn, V, Nb and N, the Mo equivalent is 0.8-1.2, the CNB is smaller than 14, and the balance is Fe and inevitable impurities. The formation of a compact SiO2 protective film is promoted by increasing the content of Si, and meanwhile, Mo and W are adopted for synergistic solution strengthening and are matched with N, V and Nb to form a dispersed MX precipitated phase. The heat-resistant steel is prepared through the processes of smelting, homogenizing, forging, hot rolling, normalizing and tempering, and a full-martensite structure can be obtained. And the obtained material has good liquid lead and bismuth corrosion resistance, room-temperature and high-temperature mechanical properties and relatively high high-temperature endurance strength, and is suitable for structural materials serving in high-temperature liquid lead and bismuth environments such as a lead-cooled fast reactor and the like.

The invention belongs to the technical field of metallurgical engineering, and particularly relates to non-oriented silicon steel and a manufacturing method thereof, and the non-oriented silicon steel comprises the following chemical components: less than or equal to 0.003% of C, 3.2-3.5% of Si, 0.4-0.6% of Mn, 0.5-0.8% of Als, 0.03-0.05% of Sn, less than or equal to 0.005% of S, less than or equal to 0.005% of N, less than or equal to 0.005% of Ti, and the balance of Fe and inevitable impurities. The production process comprises the following steps: controlling alloy components, matching with segregation of Sn element, regulating and controlling recrystallization texture, improving the electromagnetic performance of a finished product, regulating and controlling the recrystallization proportion of the structure of the finished product through normalizing and annealing process optimization, and improving the mechanical performance of the finished product. The technological process is relatively short, and the mechanical property and the electromagnetic property are good; and excessive solid solution strengthening elements such as Ni and Cr do not need to be added, the cost is low, and the method is suitable for manufacturing the high-rotating-speed rotor iron core of the new energy driving motor.

The invention belongs to the field of powder metallurgy technologies and metal ceramic materials, and discloses a preparation method of a high-entropy binding phase Ti (C, N)-based metal ceramic material and a product of the high-entropy binding phase Ti (C, N)-based metal ceramic material. The preparation method comprises the steps that Fe, Mn, Co and Cr elementary substance metal powder serves as raw materials and is mixed and then subjected to ball milling, obtained high-entropy alloy powder, Ti (C, N) powder and secondary carbide powder form mixed powder, a forming agent and absolute ethyl alcohol are sequentially added for wet milling, mixed slurry is obtained, drying, grinding, screening, pressing, degreasing and sintering are conducted, and the high-entropy alloy composite material is obtained. According to the obtained high-entropy alloy Ti (C, N)-based metal ceramic material, the core-ring structure is evenly distributed, the ring phase transition layer with the moderate thickness effectively inhibits growth of Ti (C, N) grains, fine grain strengthening and solid solution strengthening are achieved, and the high-entropy alloy Ti (C, N)-based metal ceramic material has good bending strength, fracture toughness, high hardness and high density and can be used for high-speed cutting, finish machining, semi-finish machining and the like under complex conditions.

The invention relates to the technical field of preparation of aluminum alloy forgings, in particular to a preparation method of a high-performance 6-series aluminum alloy forgings based on semi-solid pretreatment and fog cooling-oil cooling composite quenching, which comprises the following steps: step 1, smelting; step 2, cooling the melt, carrying out ultrasonic treatment to a semi-solid temperature, and standing for solidification; thirdly, the cast ingot is subjected to heat preservation treatment; fourthly, the cast ingot subjected to heat preservation treatment is subjected to hot die forging; fifthly, the forge piece is subjected to composite quenching, water mist is adopted for first-stage rapid cooling, and then oil cooling is adopted for second-stage slow cooling; and sixthly, the cooled forge piece is subjected to aging treatment. And the precipitation behavior of second-phase particles is regulated and controlled by adopting a process of fog cooling first and then oil cooling, the residual stress in the forge piece is reduced, the alloy strength is improved, and the synergistic effect of fine grain strengthening and solid solution strengthening is fully exerted.

The invention belongs to the technical field of magnesium alloy materials, and discloses a novel soluble magnesium alloy material which comprises magnesium, alloy elements and functional additives. The magnesium with the weight fraction not lower than 60% is used as a core substrate and matched with aluminum, zinc, manganese and other alloy elements and graphene, ceramic, silver and other functional additives, a synergistic interaction system is formed, the problem that the mechanical property and the dissolution characteristic of an existing soluble magnesium alloy are difficult to consider at the same time is solved, aluminum improves the strength through solid solution strengthening, zinc and tin form a nano precipitated phase to enhance the pressure resistance, and the mechanical property and the dissolution characteristic of the soluble magnesium alloy are improved. The magnesium alloy, copper, iron and nickel form an intermetallic compound, and multiple primary battery effects are matched, so that uniform and rapid degradation of the magnesium alloy is realized; harmful impurity compounds are reduced by manganese, corrosion resistance is improved, zirconium and lanthanum refine grains, gadolinium and silicon optimize high-temperature stability, wear resistance and pressure resistance are specifically enhanced by graphene and ceramic, strength is further improved by silver, and the material comprehensively overcomes the defects that an existing product is insufficient in strength, uneven in dissolution and the like.

The invention discloses a high-strength, high-plasticity and low-coercive-force soft magnetic high-entropy alloy and a preparation method thereof. The component expression of the soft magnetic high-entropy alloy is FeaCobNicVdMe according to the atomic ratio, M is one or more than two of solid solution strengthening elements Mn, B, Si, Cr, Mo and W, a is larger than or equal to 41 and smaller than or equal to 62, b is larger than or equal to 25 and smaller than or equal to 30, c is larger than or equal to 13 and smaller than or equal to 21, d is larger than or equal to 0 and smaller than or equal to 3, e is larger than or equal to 0 and smaller than or equal to 5, and a + b + c + d + e = 100. The production process is simple, the mother alloy is firstly prepared into a cast plate through induction / electric arc melting and copper mold casting, and the plate-shaped soft magnetic high-entropy alloy is prepared through high-temperature long-time vacuum heat treatment, multi-pass cold rolling, high-temperature short-time recrystallization heat treatment and air cooling.

This invention provides a tungsten-nickel-iron alloy with dual strengthening based on a molybdenum carrier and a secondary phase, and its preparation method, relating to the field of high-density tungsten-based alloy technology. The preparation method of the tungsten-nickel-iron alloy of this invention includes the following steps: S1: Preparation of composite microparticles: Combining secondary phase powder with molybdenum powder to obtain composite microparticles with secondary phase powder adhering to the surface or encapsulating it internally; S2: Mixing: Mixing the composite microparticles with tungsten powder, nickel powder, and iron powder in a specified ratio to form a mixed powder; S3: Sintering: Pressing the mixed powder into shape, and then sintering it in the liquid phase at a temperature of 1460-1550℃ for 30-120 minutes. This invention creatively designs a "composite-carrying-solution" technical route, using molybdenum particles as a carrier to introduce secondary phase particles into the interior of tungsten particles and the grain boundaries of the tungsten-molybdenum solid solution, enabling the tungsten-nickel-iron alloy to obtain tungsten-molybdenum solid solution strengthening and secondary phase dispersion strengthening, significantly improving the high-temperature strength, resistance to plastic deformation, self-sharpening properties, and penetration properties of the tungsten-nickel-iron alloy.

The invention provides a high-toughness corrosion-resistant Ti-Zr-Ta alloy and a preparation method thereof, and belongs to the technical field of alloy materials. The high-toughness corrosion-resistant Ti-Zr-Ta alloy comprises the chemical components of 1-4 at.% of Ta and the balance Ti and Zr, any element in Ti and Zr is a main matrix element of the alloy and can be replaced with each other to form a continuous solid solution structure, the high-toughness corrosion-resistant Ti-Zr-Ta alloy is prepared through smelting and high-pressure heat treatment processes, and the high-toughness corrosion-resistant Ti-Zr-Ta alloy is prepared through the high-pressure heat treatment process. On one hand, the high-pressure heat treatment increases the solid solubility of Ta in a matrix, plays a role in solid solution strengthening and improves the corrosion resistance; and on the other hand, the alpha phase transformation behavior can be inhibited, so that a full-beta-phase structure is obtained, and the plasticity and toughness are greatly improved.

This invention relates to a method for improving the high-temperature oxidation resistance of Ti-Cr-Mo-Si alloy materials, and relates to the field of high-strength, tough, and heat-resistant structural metal materials. The alloy material is composed of a Ti matrix and Cr, Mo, and Si alloying elements, which are distributed in the titanium alloy matrix in the form of solute atoms. The mass percentage of the alloying elements is: Cr: 2-8%, Mo: 2-8%, Si: 0.5-1.5%, with the remainder being Ti. The preparation method is as follows: Ti powder, Cr powder, Mo powder, and Si powder are ball-milled and mixed, followed by spark plasma sintering and high-temperature oxygen-environment heat treatment to obtain a high-strength and high-toughness Ti-Cr-Mo-Si alloy material with high temperature resistance and oxidation resistance. This invention achieves the construction of a dense bimodal TiO2-SiO2 oxide film, a Ti-Cr-Mo-Si alloy matrix, and a nano-deformed TiN twin layer through the synergistic effect of high-energy ball milling, spark plasma sintering, and high-temperature oxidation treatment. The resulting back stress strengthening, grain refinement strengthening, solid solution strengthening, and twin strengthening effects synergistically enable the prepared alloy material to exhibit excellent high-temperature oxidation resistance and excellent mechanical properties, effectively solving the problem that high-temperature materials cannot synergistically improve high-temperature oxidation resistance and mechanical properties during service.

The invention discloses high-strength thin-gauge non-oriented silicon steel with yield strength of 530 MPa and a production method thereof. The non-oriented silicon steel comprises the following chemical components: 2.9 < = Si < = 3.7%, 0.7 < = Al < = 1.2%, 0.1 < = Mn < = 0.6%, 0.0045% < = Nb + Ti + V < = 0.0055%, and 0.0035% < = C + N < = 0.0050%. According to the production method of the non-oriented silicon steel, a process route of converter smelting, RH refining, continuous casting, hot rolling, acid pickling, cold rolling and annealing is adopted, the heating temperature is larger than or equal to 1200 DEG C and smaller than or equal to 1250 DEG C, the heating time is larger than or equal to 6 h and smaller than or equal to 8 h, the finish rolling temperature is larger than or equal to 750 DEG C and smaller than or equal to 800 DEG C, and the coiling temperature is larger than or equal to 700 DEG C and smaller than or equal to 750 DEG C; the annealing target temperature t is equal to-30 [Si] < 2 > + 255 [Si] + 235, and the annealing actual set temperature T is equal to t + / -10. According to the invention, four strengthening modes of fine grain strengthening, dislocation strengthening, solid solution strengthening and precipitation strengthening are comprehensively utilized, so that the product performance reaches that Rp0.2 is more than or equal to 530MPa, P10 / 400 is less than or equal to 27W / kg, and J5000 is more than or equal to 1.64 T.

The invention belongs to the technical field of ceramic materials, and particularly relates to a wide-temperature-range MAX-phase ceramic material and a preparation method thereof. The chemical general formula of the ceramic material is (Ti1-x-yMnxMoy) 3AlC2, the value range of x is greater than or equal to 0.15 and less than or equal to 0.25, the value range of y is greater than or equal to 0.05 and less than or equal to 0.15, and the sum of x and y is 0.3. The preparation method comprises the following steps: weighing titanium powder, manganese powder, molybdenum powder, aluminum powder and graphite powder according to a stoichiometric ratio, and additionally adding 1-3at.% of excessive aluminum powder; and carrying out ball-milling mixing, drying and sieving, and sintering by adopting a two-stage hot pressing sintering process to prepare the MAX phase ceramic material. Through Mo and Mn element solution strengthening, excessive Al adding and two-stage gradient heating sintering processes, the structural stability, the mechanical property and the tribological property of the material in the wide temperature range from the room temperature to 1600 DEG C are remarkably improved.

The invention discloses copper alloy powder and a method for conducting printing repair on an aluminum bronze workpiece through the copper alloy powder, and belongs to the technical field of alloys and repair of the alloys. The alloy comprises 25-32% of Ni, 12-17% of Co, less than or equal to 1.8% of Mn and less than or equal to 2% of Si. O is less than or equal to 0.03%, and the balance is Cu. By preferably increasing the contents of Ni and Co elements, the wear resistance of the repaired surface and the bonding performance between the matrix and the additive repair layer are improved while the safety in the large-batch preparation and use process of the powder is ensured. The proportion of nickel and cobalt in the alloy is increased, the strength and hardness of the copper alloy can be improved, the nickel and the cobalt hinder dislocation movement in metal lattices through different micromechanisms, in other words, the nickel plays a role through solid solution strengthening, and the cobalt plays a role through precipitation strengthening.

The invention discloses a preparation method of novel high-yield cold-rolled DP980 steel, and belongs to the field of advanced steel and iron materials. According to the method, Nb and Ti elements are added, solid solution strengthening, precipitation strengthening and fine grain strengthening are carried out in DP980 steel, then a DP980 steel plate with the uneven thickness is rolled through unique rolling process design, then heat treatment is carried out, a heterostructure appears, the yield strength is improved, and the yield strength is improved. The method comprises the following specific steps: S1, adding 0.02-0.05% of Nb and 0.01-0.03% of Ti on the basis of components of traditional DP980 during smelting of a steel ingot; s2, rolling the steel billet by adopting a concave-convex roller during rolling; and S3, the rolled steel plate is subjected to a critical annealing process of heat preservation at 790-810 DEG C for 2-5 minutes. By means of the method, the DP980 steel can obtain a heterostructure with an uneven structure, and the grain size of ferrite in a high-deformation area is smaller. The yield strength of the DP980 steel prepared through the technology ranges from 720 MPa to 800 MPa, and the yield strength of the DP980 steel is improved by about 15% compared with that of existing DP980 steel.

The invention provides (ZrHfVCrMoW) Cx complex-phase carbide ceramic and a preparation method and application thereof, and belongs to the technical field of complex-phase ceramics, the (ZrHfVCrMoW) Cx complex-phase carbide ceramic is of a complex-phase face-centered cubic structure, the molar percentages of Zr, Hf, V, Cr, Mo and W metal elements in the complex-phase carbide ceramic are equal, and the value range of x is 0.5-1.0. The six-component carbon non-stoichiometric ratio (ZrHfVCrMoW) Cx complex-phase carbide ceramic material prepared by the preparation method disclosed by the invention has the advantage that the comprehensive performance of multi-component carbide ceramic is improved due to solid solution strengthening and cocktail effect. And meanwhile, the grain size of the (ZrHfVCrMoW) Cx complex-phase multi-component carbide ceramic is smaller due to the obvious two-phase structure of the (ZrHfVCrMoW) Cx complex-phase multi-component carbide ceramic. The Vickers hardness (HV1) under the room temperature condition reaches about 24.4 GPa, the three-point bending strength reaches 520 MPa, and the fracture toughness reaches 4.0 + / -0.3 MPa.m < 1 / 2 >.

The application discloses a non-transition / transition metal synergistically enhanced and toughened high-entropy carbide ceramic material and a preparation method thereof. The ceramic material is prepared from raw materials including at least one of non-transition metal Ni, Fe and Mn powder, with a total mass fraction of 8.5-13.6%; transition metal Nb powder, with a mass fraction of 4.3-42.9%; and mixed powder of VC, TiC and TaC, with a total mass fraction of 48.3-83.2%. The application introduces non-transition metal Ni / Fe / Mn as a tough metal binder phase, and utilizes the solid solution strengthening effect between transition metal Nb element and VC, TiC, TaC and Cr3C2 ceramic to construct a high-entropy carbide skeleton with carbon vacancies, so that the problem of high brittleness and sintering difficulty of the existing high-entropy ceramic is solved through mass ratio regulation.

The invention discloses a preparation method of a nitrogen-reinforced high-hardness corrosion-resistant 17-4ph material. The preparation method comprises the steps of mixing, injection molding, degreasing, nitrogen sintering and heat treatment. Through in-situ nitrogen solid solution strengthening, a strengthened martensite matrix structure is obtained. The relative density of the obtained material is larger than or equal to 97%, the Hrc hardness is larger than or equal to 46, the tensile strength is larger than or equal to 1500 MPa, the yield strength is larger than or equal to 1200 MPa, the ductility is larger than or equal to 5%, the neutral salt spray test corrosion resistance time is larger than or equal to 48 h, and the material is suitable for surgical robots and other high-end medical instruments.

This invention relates to the field of steel material manufacturing, addressing the problem that existing steels struggle to simultaneously ensure weather resistance and low-temperature toughness. It provides an engineering steel for extreme conditions and its short-process preparation method, comprising, by weight percentage: C 0.10%-0.15%, Si 0.17%-0.37%, Mn 1.60%-2.00%, Ni 2.5%-5.0%, Cu 0.35%-0.55%, Cr 0.35%-0.55%, V 0.13%-0.15%, and Nb 0.01-0.02%. This invention achieves weather resistance by eliminating high phosphorus (P) and adopting a Cu-Cr-high Ni composition, thus eliminating the harmful effects of P on temperature and toughness from the compositional source. It shifts from existing alloying compromise strategies to a method of compositional purification and alloy optimization, no longer relying on the harmful element P, but achieving steel performance suitable for extreme conditions through purification and a better alloy combination; simultaneously, the high Ni content also ensures high low-temperature impact toughness. This invention employs low-carbon Mn solid solution strengthening, V / Nb composite microalloying for fine grain strengthening, and precipitation strengthening to ensure higher strength in steel. The engineering steel provided by this invention not only has high strength and toughness but is also suitable for freeze-thaw environments as well as rainy environments.

This application belongs to the field of high-temperature alloy technology, and particularly relates to a low-density, high-strength, low-expansion high-temperature alloy and its preparation method. Existing Ni-Mo-Cr low-expansion high-temperature alloys rely solely on Mo solid solution strengthening and Cr oxidation resistance, without introducing Ti and Al to form γ' phase precipitation strengthening, and without establishing a stoichiometric balance between the Ni matrix and Ti and Al elements. This results in high density and low strength in existing alloys, failing to achieve a balance between low density and high strength. The embodiments of this application introduce Ti and Al to form γ' phase precipitation strengthening phases, replacing some of the heavier Ni element with lighter Ti and Al elements, and establishing a stoichiometric balance of [1.6Ni-3(2Ti+3.6Al)] / Mo = 3.0 to 4.2. This achieves for the first time the synergistic effect of solid solution strengthening and precipitation strengthening, as well as the simultaneous reduction of density and increase in strength, thus solving the technical problem of how to achieve low density, low expansion, and high strength in low-expansion high-temperature alloys.

The embodiment of the invention provides a high-temperature corrosion-resistant superalloy and a preparation method thereof, relates to the technical field of metal structure materials, and discloses a nickel-based wrought superalloy which comprises the following components in percentage by weight: 0.04-0.08% of C, 28.5-29.5% of Cr, 10.0-12.0% of W, 3.0-5.0% of Mo, 1.0-1.5% of Al, 0.5-0.8% of Ti, less than or equal to 1% of Fe, 0.8% of Si and the balance of Ni. The deformation high temperature is solid solution strengthening type nickel-based anti-oxidation high-temperature alloy, and the alloy density is 8.88 g / cm < 3 >. The high-temperature alloy designed by the invention is mainly used for a sintering key part of a coke reactor, ensures that the high-temperature alloy has high temperature resistance, oxidation resistance, CO resistance and tar corrosion resistance at a use temperature, and also has very good plasticity and excellent welding performance.

The invention relates to a MnB2 reinforced W-Ni-Fe-Co alloy and a preparation method thereof.The MnB2 reinforced W-Ni-Fe-Co alloy is prepared from, by mass, 89%-95% of W, 2%-5% of Ni, 1%-2.5% of Fe, 0.3%-2% of Co and 0.2%-1.5% of MnB2. The preparation method of the MnB2 reinforced W-Ni-Fe-Co alloy comprises the steps that all component powder is evenly mixed through acoustic mixing resonance, after mold pressing or cold isostatic pressing forming is conducted, presintering and high-temperature sintering are conducted under hydrogen protection, and then solution treatment is conducted to obtain the MnB2 reinforced W-Ni-Fe-Co alloy. According to the invention, elements Co and MnB2 are fully utilized to play a synergistic composite strengthening effect of fine grain strengthening, solid solution strengthening and dispersion strengthening on the alloy, so that the alloy can still keep better toughness while the strength is improved, and the alloy also shows excellent radiation resistance and corrosion resistance; therefore, the method has wide application prospects in the fields of aerospace, nuclear industry, high-end equipment manufacturing and the like.

The invention discloses a method for enhancing fatigue performance of a Ti175 porous titanium alloy, which comprises the following steps of: under the protection of inert atmosphere, quickly putting a sample into a central isothermal area of a tubular furnace preheated to a first target temperature, continuously heating to a second target temperature, preserving heat, converting an original structure into a double-state structure, and cooling to room temperature at a controlled cooling rate; under inert atmosphere protection, the sample is heated to a third target temperature and subjected to heat preservation, then cyclic loads within the elastic range are applied in a stress control mode, and after loading is finished, the sample is cooled to the room temperature at the controlled cooling rate; under the air or inert atmosphere, the sample is rapidly placed into a box-type furnace preheated to a fourth target temperature, the temperature continues to rise to a fifth target temperature, heat preservation is conducted for a short time, residual stress is released, a surface oxygen solid solution strengthening layer is formed, and then the sample is cooled to the room temperature at the controlled cooling rate.

The invention relates to low-nickel high-strength austenitic heat-resistant stainless steel and a preparation method thereof, belongs to the technical field of metal preparation, and aims to maintain or improve the strength and creep property at high temperature of 1000 DEG C and the like on the premise of reducing the Ni content and alloy cost, so that the low-nickel high-strength austenitic heat-resistant stainless steel can replace traditional high-Ni austenitic heat-resistant steel. The heat-resistant stainless steel comprises the following chemical components in percentage by mass: 0.35 to 0.55 percent of C, 1.2 to 2.2 percent of Si, 4.0 to 6.0 percent of Mn, 20.0 to 23.0 percent of Cr, 1.0 to 2.5 percent of Ni, 0 to 0.30 percent of Mo, 0 to 0.20 percent of V, 0.8 to 1.2 percent of Nb, 0.18 to 0.28 percent of N, 0 to 0.5 percent of Cu, less than or equal to 0.04 percent of P, less than or equal to 0.03 percent of S and the balance of Fe and inevitable impurity elements. According to the invention, through a multi-level collaborative mechanism of Mn + N austenite stabilization-Cr / Ni / Mn slow diffusion solid solution strengthening-C / Nb precipitation strengthening, the Ni consumption is reduced, and excellent strength, stability and comprehensive service performance can still be obtained.

The invention discloses non-oriented silicon steel for a driving motor and a manufacturing method of the non-oriented silicon steel. The non-oriented silicon steel comprises the following chemical components in percentage by weight: less than or equal to 0.0025% of C, 2.7-3.2% of Si, 0.25-0.50% of Mn, less than or equal to 0.010% of P, 0.65-0.80% of Als, less than or equal to 0.0025% of S, less than or equal to 0.0020% of N, less than or equal to 0.0020% of Ti, 0.015-0.035% of Cu and the balance of Fe and inevitable impurities. The production method comprises the production steps of molten steel smelting, continuous casting, heating, rolling, normalizing pickling, cold rolling, annealing, stamping flaking and stress relief annealing. By adjusting alloy elements and combining process design, on the premise that the excellent magnetic performance of the material is guaranteed, the mechanical performance is improved by adopting a solid solution strengthening principle, deterioration of the magnetic performance in the sheet manufacturing process is eliminated through solid solution and stress relief annealing, the magnetic performance of the iron core is improved, and the mechanical performance of the product is improved.

This invention relates to a gradient-structured rare-earth nitride-coated ceramic solid solution-strengthened high-wear-resistant refractory high-entropy alloy coating and its preparation method. First, an optimized sol-gel method is used to in-situ coat a nano-scale YN layer onto the surface of micron-sized Si3N4 particles, constructing a core-shell structured YN@Si3N4 composite precursor. Subsequently, this precursor is mixed with pre-alloyed TiZrNbMo high-entropy alloy powder in different proportions, and a base layer, a transition layer, and a wear-resistant functional layer are sequentially constructed on the substrate surface from the inside out using laser cladding technology. The amount of YN@Si3N4 added in this gradient coating increases in a gradient distribution from 0 to 3.0 wt.%, effectively alleviating the thermal stress mismatch between the coating and the substrate. This invention achieves synergistic strengthening through Si substitution solid solution and N interstitial solid solution, while eliminating brittle phase segregation, porosity, and crack defects through gradient structure design and melt pool dynamics control, preparing a single-phase BCC structure coating with both high strength and toughness and excellent wear resistance, significantly improving the service reliability of aerospace components under extreme conditions.

The invention discloses an iron-copper alloy-based friction plate and a preparation method thereof. The iron-copper alloy-based friction plate comprises the following raw materials in percentage by weight: 70-80% of iron-copper alloy powder, 7-15% of a friction reinforced phase composite material, 2-7% of a friction auxiliary material, 8-15% of a solid solution strengthening material, 0.7-1.5% of graphite and 0.5-1% of a lubricant, the friction reinforced phase composite material is a mixture of silicon dioxide, silicon carbide and aluminum oxide; the friction auxiliary material is a mixture of silicon-aluminum whiskers, calcium silicate whiskers, manganese-zinc alloy powder and carbon fiber powder; the solid solution strengthening material is zinc-tin-phosphorus alloy powder. The preparation method comprises the following steps: preparing materials; performing compression molding; sintering is performed; and machining and surface treatment. According to the invention, the raw material formulas cooperate with each other and cooperate with each step of the preparation method, so that the prepared product is good in wear resistance and stable in friction coefficient.

The application provides a high-strength and high-plasticity six-element FeNiCoCrAlV high-entropy alloy and a preparation method thereof, and relates to the technical field of high-entropy alloys.The high-strength and high-plasticity six-element FeNiCoCrAlV high-entropy alloy provided by the application comprises the following elements with atomic percentages: Fe 40-42%, Ni 18-22%, Co 18-22%, Cr 8-12%, Al 4-6%, V 3-5%, and the atomic percentages of Ni and Co are equal.The high-entropy alloy provided by the application is a six-element non-equal-atomic-ratio single-phase high-entropy alloy;Al and V are added in the CoCrFeNi high-entropy alloy, the solid solution strengthening effect is increased, and the alloy still has an FCC structure, which enables the alloy to be rolled at room temperature with a large deformation, and further refines the grain size of the alloy, improves the strength of the alloy, so that the high-entropy alloy has high strength and high plasticity, and has excellent strength and plasticity matching.

The invention belongs to the technical field of hard alloy materials, and particularly relates to a Co-Ni-Cr-Al-Ti adhesive hard alloy and a preparation method thereof. In a WC-Co-Ni-Cr-Al hard alloy material, gamma '-phase (Ni, Co) 3Al is precipitated and separated out from a Co-Ni-Cr-Al adhesive as a main mechanism for strengthening the performance of the hard alloy material, a certain amount of Ti is added on the basis, the Co-Ni-Cr-Al-Ti adhesive is designed, and the effect of solid solution strengthening of the gamma'-phase is achieved due to the fact that Ti can be dissolved into the gamma '-phase, so that the performance of the hard alloy material is strengthened. According to the method, the self-strengthening effect of the gamma'phase is reserved, meanwhile, the gamma 'phase is strengthened, and finally the mechanical property stability of the whole hard alloy material is improved.

This invention discloses a high-hardness wear-resistant steel bond alloy based on solid solution strengthening and its preparation method, relating to the field of powder metallurgy. The high-hardness wear-resistant steel bond alloy based on solid solution strengthening comprises the following components by weight: 32-38 parts of (Ti,Cr,Mo)C solid solution particles, 55-65 parts of Fe powder, 0.5-2 parts of Ni powder, 0.2-1 parts of Mn powder, and 0.1-0.3 parts of ultrafine carbon black. The high-hardness wear-resistant steel bond alloy based on solid solution strengthening provided by this invention has a reduced oxygen content and significantly reduced oxide inclusions; under the same high-speed wire drawing conditions, its service life can reach more than three times that of traditional GT35; carbon content fluctuations are effectively controlled, and martensitic hardness stability is significantly improved.