282 results about "Solid solution strengthening" patented technology

The invention relates to the technical field of magnesium alloys, in particular to a high-toughness rare earth-containing magnesium alloy and a preparation method thereof.The high-toughness rare earth-containing magnesium alloy is prepared from, by weight, 3-8 parts of Zn, 1-5 parts of RE, 0.5-3 parts of Al, 0.1-1 part of Mn, 0.05-0.3 part of Zr and the balance Mg; rE is a combination of Y, Nd and La in a mass ratio of (2-3): 1: (0.5-1). Zinc is used as a secondary main element to replace part of aluminum, efficient solid solution strengthening is achieved through high solid solubility of zinc in magnesium, meanwhile, the morphology and distribution of a precipitated phase are regulated through rare earth, a beta-MgZn2 phase is formed, the high-temperature stability is better, balance optimization of strength, toughness and corrosion resistance is achieved, meanwhile, the welding performance of the alloy is improved through combination of Y, Nd, La and Zr, and the welding performance of the alloy is improved. The hot crack tendency is reduced, the brittle phase problem of a traditional high aluminum alloy is avoided, and the corrosion resistance and the machining performance are synergistically improved.

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 relates to the field of metal material surface strengthening, in particular to an in-situ reaction multi-element ceramic phase reinforced titanium-based composite coating and a preparation method thereof. The preparation method comprises the steps that titanium alloy powder and B4C powder are mixed, and mixed powder is obtained; the mixed powder is conveyed to a cladding focus under atmosphere protection, reaction gas is introduced, laser cladding is conducted, and the in-situ reaction multi-element ceramic phase reinforced titanium-based composite coating is formed on the surface of the metal sample; the reaction gas is nitrogen; the laser power is 1-2 kW, the scanning speed is 5-20 mm / s, and the multi-pass cladding lap joint rate is 40%-80%. By regulating and controlling the laser cladding process, optimizing the laser power, the scanning speed and the reaction gas flow and utilizing a dispersion strengthening mechanism and a solid solution strengthening mechanism of a ceramic phase generated through in-situ reaction, the hardness and the wear resistance of the composite coating are improved, the problems that a traditional titanium-based coating is low in hardness and poor in wear resistance are effectively solved, and the service life of the coating is prolonged. The method is suitable for surface strengthening of key components in the fields of aerospace, ocean engineering and the like.

The invention provides a friction-resistant high-entropy alloy composite coating and a preparation method thereof, and belongs to the technical field of metal surface modification. A FeCoCrNiMox (x is greater than or equal to 0.18 and less than or equal to 0.25) high-entropy alloy is taken as a main component of composite powder, graphene is taken as an additive phase, and the FeCoCrNiMox high-entropy alloy composite coating is prepared on the surface of a matrix by adopting a laser cladding method. The graphene added in the composite powder can generate carbides in situ under the action of laser cladding, and second phase strengthening, solid solution strengthening and fine grain strengthening are generated, so that the friction resistance of the surface of the matrix is remarkably improved. The preparation method is easy to operate and low in cost, the prepared composite coating is high in bonding strength, good in toughness and plasticity and excellent in friction resistance, the surface performance of equipment can be effectively improved, safe and stable operation of the equipment is guaranteed, the service life of the equipment is prolonged, and maintenance expenditure is reduced.

Tungsten powder, molybdenum powder, titanium carbide powder and tungsten-copper composite powder are mixed to obtain mixed powder, the mixed powder is pressed and formed to obtain a formed blank, the formed blank is sintered to obtain a ceramic reinforced tungsten framework, the ceramic reinforced tungsten framework is subjected to copper infiltration treatment, and the tungsten-infiltrated copper material is obtained. Titanium carbide and molybdenum are introduced when the tungsten framework is sintered, the strength of the tungsten framework is effectively improved through the solid solution strengthening effect of molybdenum and the second phase strengthening effect of titanium carbide, then the high-temperature strength of the tungsten infiltrated copper material is remarkably improved, meanwhile, the density of the material can be reduced, and weight reduction of tungsten infiltrated copper is achieved. Besides, in the process of sintering the ceramic reinforced tungsten framework, superfine tungsten-copper composite powder is introduced, the sintering performance of the tungsten framework can be remarkably improved, the subsequent copper infiltration effect can be optimized, and therefore the tungsten infiltrated copper material is uniform in component structure, the ablation resistance of the light ablation-resistant tungsten infiltrated copper material is excellent, and the density is greatly reduced compared with existing tungsten infiltrated copper.

The invention relates to the technical field of alloy powder preparation, and particularly discloses alloy powder for laser surfacing and a preparation method thereof, and the alloy powder for laser surfacing comprises 8-12% of nickel (Ni), 4-6% of chromium (Cr), 2-3% of molybdenum (Mo), 1-2% of boron (B), 10-15% of titanium carbide (TiC), 0.5-1% of yttrium oxide (Y2O3), 0.5-1% of silicon (Si), 0.1-0.3% of carbon (C) and the balance of iron (Fe). Fe is used as a matrix, corrosion-resistant and solution strengthening elements such as Ni, Cr and Mo are accurately matched, a low-content Y2O3 rare earth element and a TiC nano strengthening phase are introduced, Y2O3 effectively inhibits grain coarsening in the surfacing process, the brittleness problem caused by the traditional high rare earth content is avoided, TiC nano particles are evenly dispersed in the matrix and form a composite strengthening structure with a Cr7C3 hard phase, the hardness of a surfacing layer is improved, and the hardness of the surfacing layer is improved. The wear-resistant life is prolonged.

The invention discloses a high-strength and high-plasticity Ti2AlNb alloy additive preparation method. The high-strength and high-plasticity Ti2AlNb alloy additive preparation method comprises the following steps that firstly, scanning parameters are set; 2, prefabricating a solid sheet layer; 3, in-situ heat treatment; and 4, preparing the component. According to the preparation method, through slicing and layering treatment, by means of a slice layer alternate merging melting scanning mode, overheating and remelting of adjacent slice layers are effectively avoided, and the structure stability and the mechanical property are greatly improved; the in-situ heat treatment is beneficial to exerting the effects of phase boundary strengthening and solid solution strengthening, the metallurgical bonding strength of lamellas can be improved, the structure and performance difference caused by lamellar remelting is solved, the plasticity of the Ti2AlNb alloy is remarkably improved on the premise that the excellent strength of the Ti2AlNb material is kept, the room-temperature tensile strength of the prepared Ti2AlNb alloy is not lower than 1100 MPa, the yield strength is not lower than 990MPa, and the tensile strength of the prepared Ti2AlNb alloy is not lower than 10MPa. The plasticity is not lower than 6%, and the method has a wide application prospect in the field of aerospace equipment.

The present application relates to the manufacture of high-strength steel coated plate welded parts, in particular to a welding material, a high-strength steel workpiece, a laser welded joint and a manufacturing method thereof. The composition of the welding material satisfies the following conditions in terms of percentage by weight: C is greater than or equal to 0.5%, trace alloying elements are 0-0.36%, the content of Mn and Si is less than or equal to 2%, 6% is greater than or equal to 5C+Mn and is greater than or equal to 2.5%, and the rest is Fe and inevitable other elements; the trace alloying elements are at least one of Nb, V and Ti elements, and the content of Nb, V and Ti elements is less than or equal to 0.12%. The method does not need to remove the aluminum coating, utilizes the solid solution strengthening effect of C, and makes the volume fraction of lath martensite in the final weld after quenching greater than or equal to 90%. This scheme reduces the addition of alloying elements, reduces the cost and process control difficulty, avoids the formation of coarse carbides, improves the mechanical properties and stability of the joint, has high fracture strength and elongation, and realizes the double improvement of the strength and toughness and economy of the joint.

The invention provides a high-entropy reinforced gold-based coating as well as a preparation method and application thereof, and relates to the technical field of conductive lubricating materials. The invention provides a high-entropy strengthened gold-based coating. The high-entropy strengthened gold-based coating comprises a Ni transition layer and an Au-FeCoNiCr composite layer, wherein the Ni transition layer and the Au-FeCoNiCr composite layer are sequentially arranged on a copper alloy base material in a stacked mode. The face-centered cubic FeCoNiCr high-entropy alloy formed by Fe, Co, Ni and Cr elements which are obvious in solid solution strengthening of the Au coating and similar in relative atomic mass serves as a doping phase of the gold-based conductive lubricating coating, the grain refinement effect of the coating can be effectively improved, meanwhile, a solid solution structure is formed, and the strength of the coating is enhanced; and moreover, by doping FeCoNiCr, the residual stress of the coating is reduced, the nano hardness and binding force of the coating are improved, and the frictional wear performance of the coating is improved. The high-entropy strengthened gold-based coating provided by the invention has high conductivity and high lubricating property, and is low in cost.

The invention discloses high-strength non-oriented silicon steel with yield strength of 930 MPa and a production method thereof. The non-oriented silicon steel comprises the following chemical components: 3.0 < = Si < = 4.0%, 0.1 < = Al < = 1.2%, 0.1 < = Mn < = 1.0%, 0.0005 < = Nb < = 0.0010%, 0.0018% < = Ti < = 0.0030%, 0.0010% < = V < = 0.0025%, 0.0020% < = C < = 0.0035%, 0.0010% < = N < = 0.0025%, 4.0 < = Si + Al + Mn < = 5.4%, 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, the process route of converter smelting, RH refining, continuous casting, hot rolling, acid pickling, cold rolling, annealing and coating 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, 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-56.8 A2 + 572.9 A-825.7, the annealing actual temperature T is t + / -30, the annealing target speed c is 120 + 1.5 (T-t), and the annealing actual speed C is c + / -5. Three strengthening modes of dislocation strengthening, solution strengthening and precipitation strengthening are comprehensively used, a component-annealing temperature-annealing speed matching relation and a hot rolling process of'high-temperature long-time heating, low-temperature finish rolling and high-temperature coiling 'are designed, the yield strength Rp0.2 of the obtained non-oriented silicon steel is larger than or equal to 930 MPa, the iron loss P1.0 / 400 is smaller than or equal to 57 W / kg, and the magnetic polarization strength J5000 is larger than or equal to 1.52 T.

The invention relates to the field of high-temperature alloy component design, in particular to a high-temperature alloy compensation design method based on interaction characteristics of an impurity element S and precious metal Ru. The single-crystal high-temperature alloy is prepared through directional solidification, the total content of refractory elements (Cr, W, Mo, Re, Ta, Hf and the like) of the high-temperature alloy exceeds 20 wt.%, the alloy does not contain rare precious metal Ru and the like, the high-temperature creep resistance of the alloy is improved through the solid solution strengthening and precipitation strengthening effects, the content of S in the alloy is smaller than 1 ppm, the TCP phase precipitation tendency is obviously reduced, and the number of TCP precipitated through thermal exposure is minimum. Based on the interaction characteristic of S and Ru, Ru capable of improving the alloy structure stability in the high-generation single-crystal high-temperature alloy is removed, the alloy is compensated and designed by controlling the content of S in the alloy to be smaller than 1 ppm, so that the structure stability of the single-crystal high-temperature alloy is improved, and a guiding thought can be provided for component design of the low-cost high-generation single-crystal high-temperature alloy.

The invention relates to the technical field of wear-resistant steel ball casting, and discloses a process for producing as-cast wear-resistant steel balls by using a multi-element modified alloy, which comprises the following steps of: smelting molten steel, namely putting raw materials into an electric arc furnace or an induction furnace, heating to 1550-1650 DEG C, and smelting to obtain basic molten steel; multi-element modified alloy is added, specifically, the multi-element modified alloy is added into the smelted molten steel, the adding amount of the multi-element modified alloy accounts for 0.5%-2.0% of the total weight of the molten steel, stirring is conducted for 10-30 minutes at the temperature of 1500-1600 DEG C, and the alloy is made to be evenly dispersed; performing modification treatment; according to the multi-element modified alloy, through the synergistic effect of the rare earth element RE and the alkaline metal components Ba and Ca, deep deoxidation and impurity purification are achieved in the molten steel smelting stage, the oxygen activity is reduced, non-metallic inclusion residues are reduced, meanwhile, the grain structure is refined through a solid solution strengthening mechanism of MnN and CrN, a uniform and compact matrix structure is formed, and therefore the corrosion resistance of the alloy is improved. And the overall compactness and impact toughness of the wear-resistant steel ball are improved.

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 discloses a low-cost, high-strength and low-yield-ratio wire rod for a rivet nut and a preparation method of the wire rod, and belongs to the field of metallurgical production of wire rods. The wire rod comprises the following chemical components in percentage by weight: 0.19 to 0.23 percent of C, 0.35 to 0.55 percent of Si, 1.30 to 1.60 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.25 to 0.35 percent of Cr, 0.002 to 0.020 percent of Al and the balance of Fe and inevitable impurities. The preparation method comprises the steps of smelting and casting, cogging, wire rod controlled rolling, cooling and the like, and the grain size of a wire rod is controlled to be 5-6 levels by optimizing component design (solution strengthening is mainly conducted on low-cost Si and Mn elements) and technological parameters (high-temperature heating, precise controlled rolling and controlled cooling, low-Al design and the like); the tensile strength of the rivet nut manufactured through follow-up modification, cold heading and annealing treatment reaches 530-610 MPa, the yield strength ranges from 320 MPa to 360 MPa, the yield ratio is smaller than or equal to 0.6, the 10.9-level requirement is met after riveting hardening, the production cost is remarkably reduced, and the problems that an existing high-level rivet nut depends on precious metal, the yield ratio is high, and cracking is likely to happen are solved.

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.

The present application relates to the technical field of titanium alloy material engineering, and particularly relates to a yield strength calculation method based on the microstructure of titanium alloy with basket weave structure. The yield strength of titanium alloy with basket weave structure is divided into matrix strength, solid solution strengthening effect, grain boundary strengthening effect, dislocation strengthening effect and alpha phase precipitation strengthening effect. The present application innovatively designs a more accurate alpha phase precipitation strengthening model, and designs a circumscribed rectangle length-width statistical method and a phase microstructure weighting algorithm based on area for auxiliary statistics. The traditional method converts lamellar alpha phase into an equal-area circle to consider the strengthening effect. The present application fits the lamellar alpha phase into a long-axis rectangular part and a short-axis two-semicircle part. Compared with the traditional method, the yield strength calculation method based on the microstructure of titanium alloy with basket weave structure in the present application is more close to the actual situation, the statistical method is more accurate and reliable, the result has a smaller error with the actual result, and can be used in the engineering technical fields of titanium alloy microstructure design and performance control.

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 relates to a cutter nano coating which is a nano composite coating formed by superposing a Tix1Aly1M (1-x1-y1) N layer and an Al0. 6Cr0. 4N layer, M of the Tix1Aly1M (1-x1-y1) N layer is composed of one or more than two substances of Zr, Hf, Cr, Mo, W, Nb, Ta, Y and Si, 1-x1-y1 is equal to 0.01-0.1, x1 is smaller than y1, and x1 is smaller than y1. And the thickness of the Al < 0.6 > Cr < 0.4 > N layer does not exceed the thickness of the Ti < x > Al < y > M (1-x1-y1) N layer. The Tix1Aly1M (1-x1-y1) N layer and the Al0. 6Cr0. 4N layer are combined, solid solution strengthening and fine grain strengthening are formed through element doping, and the cutting performance of the coated cutting tool is conveniently and efficiently improved.

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 application relates to an aluminum alloy plate strip and a preparation method thereof, which comprises the following components in percentage by mass: Si: 0.7-0.9%, Fe<=0.3%, Cu: 0.35-0.4%, Mn: 1.5-1.6%, Zn: 1.6-1.8%, Ti: 0.01-0.03%, and the balance of Al and inevitable impurities. Through narrow-window multi-component synergistic design, combined with double-stage homogenization and recovery annealing process, the application effectively inhibits coarse beta phase, promotes fine alpha-Al(MnFe)Si phase precipitation, realizes Cu-Zn synergistic solid solution strengthening and Zr dispersion pinning, significantly improves microstructure uniformity and corrosion resistance, and improves the stability and consistency of mechanical properties under H18 hard state.

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.