795 results about "Ta element" 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 relates to a preparation process optimization method of a zirconium alloy material with high fretting wear resistance, which comprises the following steps: setting a chemical component optimization range of a zirconium alloy, including specific proportions of tin, iron, niobium, chromium and oxygen elements; establishing a computer simulation model, and predicting the wear volume, tribological stability and microstructure evolution of the material under the fretting wear condition; then, a complete optimization scheme is output based on the model optimization homogenization treatment temperature interval, the hot working deformation range, the cold working cumulative deformation degree and the annealing system; and finally, a preparation process sequence including smelting, homogenization treatment, hot working deformation, cold working deformation and final heat treatment is implemented, the zirconium alloy material with the equiaxed grain structure is prepared, and the wear resistance of the zirconium alloy material is verified through an experimental fretting wear performance test. Compared with the prior art, the method has the advantages that through systematic component design and process parameter simulation optimization, the material performance is remarkably improved, and the application reliability is enhanced.

A steel sheet, coated with a metallic coating including, by weight percent, from 7.5 to 9.0% of zinc, from 1.1 to 4.0% of silicon, from 1.1 to 8.0% of magnesium, up to 3.0% of iron, optional elements chosen from Pb, Ni, Zr, or Hf, the content by weight of each element being less than 0.3%, optionally up to 100 ppm of Calcium and unavoidable impurities up to 0.02%, a balance being aluminum, and wherein the coating weight of the metallic coating is from 50 to 500 g / m2 for the sum of both sides of the-steel sheet.

The invention provides a Y-rich rare earth permanent magnet and a preparation method and a magnetic performance improving method thereof, and the performance improving method comprises the steps: uniformly mixing to-be-diffused metal powder containing Dy and / or Tb elements with an organic solvent to obtain to-be-diffused alloy liquid; the alloy liquid to be diffused is attached to the surface of the Y-rich rare earth permanent magnet, and the Y-rich rare earth permanent magnet is placed in a vacuum sintering furnace; the Y-rich rare earth permanent magnet is subjected to grain boundary diffusion heat treatment through the vacuum sintering furnace, so that Dy and / or Tb elements are diffused into the surface layer of a main phase lattice of the Y-rich rare earth permanent magnet; and carrying out tempering treatment on the Y-rich rare earth permanent magnet. The problems that the coercive force of an existing Y-containing magnet is difficult to effectively improve, and residual magnetism is easily reduced can be effectively solved.

The invention discloses wear-corrosion-resistant high-strength steel for a power transmission tower and a preparation method thereof, and belongs to the technical field of metal materials. The wear-corrosion-resistant high-strength steel for the power transmission tower provided by the invention has good corrosion resistance and wear resistance, has excellent wear resistance in a soil environment of sulfate ions with the concentration of 300 mg / kg-50000 mg / kg and chloride ions with the concentration of 500 mg / kg-10000 mg / kg, and meets various environmental performance requirements of an acid soil environment, an atmospheric corrosion environment and the like. In an acid soil environment, the corrosion resistance is more than 8 times that of plain carbon steel, and the relative corrosion rate is lower than 10%; compared with Q355B, the corrosion rate of atmospheric corrosion resistance is lower than 40%, and the abrasive wear rate is 26.5%-28.0%; and through reasonable matching of corrosion-resistant elements, the requirements of corrosion resistance in various environments are met. The yield strength is 775 MPa-805 MPa, the tensile strength is 952 MPa-985 MPa, the percentage elongation after fracture A50 is larger than or equal to 28%, the low-temperature impact toughness at the temperature of-60 DEG C is larger than or equal to 260 J, meanwhile, the forming performance is excellent, and the 180-degree cold bending requirements that d is equal to 1.0 a are met.

The invention relates to the technical field of steel for ocean engineering, in particular to a seawater-corrosion-resistant low-alloy high-strength steel plate and a preparation method thereof. A proportioning system of strengthening elements such as C, Nb, V, Ti and Mo is innovatively optimized, meanwhile, Zr, Mg and rare earth elements (La and Ce) are introduced for inclusion modification treatment, and elements such as Cr, Ni and Cu are cooperatively utilized for improving the corrosion-resisting intrinsic performance of a matrix; in the aspect of a production process, a whole-process precise regulation and control technology of controlled rolling, ultrafast cooling and optimized quenching and tempering heat treatment is adopted, and finally the high-performance steel plate with the strength, the toughness and the corrosion resistance cooperatively matched is prepared. According to the steel plate, the excellent mechanical properties that the yield strength is larger than or equal to 690 MPa and the low-temperature impact energy at the temperature of-60 DEG C is larger than or equal to 100 J can be achieved, the excellent corrosion resistance is shown in the harsh seawater environment, the stability of the production process is high, and the steel plate is suitable for industrial large-scale production.

The invention belongs to the technical field of titanium alloy smelting, and particularly relates to a smelting method of a large-size titanium alloy ingot containing segregation-prone elements, which comprises the following steps: mixing sponge titanium and intermediate alloy required by smelting, and sequentially carrying out electrode block pressing, assembly welding, primary vacuum consumable smelting, vacuum skull smelting and secondary vacuum consumable smelting, and the large-specification titanium alloy ingot containing the segregation-prone elements is obtained. The method has the advantages that the process route of two times of vacuum consumable arc melting and one time of vacuum skull melting is adopted, the production process is relatively short, the production efficiency is high, the strong stirring effect generated by vacuum skull melting is used, the mixing uniformity of all components in the cast ingot is enhanced, sufficient diffusion of elements prone to segregation is avoided, the segregation trend is reduced, and the quality of the cast ingot is improved. The maximum specification of the titanium cast ingot is phi 720 mm, the weight of a single ingot is 5000 kg or above, and the titanium cast ingot contains a large number of elements easy to segregate, and industrial large-scale production can be achieved easily.

The invention relates to a low-stress copper-cobalt-nickel-silicon alloy and a preparation method and application thereof. The low-stress copper-cobalt-nickel-silicon alloy comprises 0.5 wt%-1.0 wt% of Ni, 0.005 wt%-0.4 wt% of Co, 0.1 wt%-0.3 wt% of Si, 0.05 wt%-0.4 wt% of Sn, 0.01 wt%-0.02 wt% of P, 0.05 wt%-0.3 wt% of Zn and the balance Cu and inevitable trace impurities. The preparation method of the low-stress copper-cobalt-nickel-silicon alloy comprises the steps of burdening, smelting, casting, hot rolling, rough rolling, primary annealing, intermediate rolling, aging heat treatment, finished product rolling and secondary annealing. The preparation method comprises the following steps: proportioning and smelting according to the mass percent of each element of the copper alloy; the aging heat treatment is stepped aging heat treatment, heating is conducted to 200-350 DEG C, heat preservation is conducted for 1-2 h, then heating is conducted to 400-500 DEG C, and heat preservation is conducted for 10-12 h.

The invention discloses a non-oriented silicon steel composite material and a preparation method thereof.The method comprises the steps that powder of Ce, La and Y elements is subjected to ball milling, and ground powder with the particle size smaller than or equal to 8 micrometers is obtained; adding 0.5-1.2 wt% of nano TiO2 as a modifier into the ground powder, and uniformly depositing a rare earth composite layer on the surface of a non-oriented silicon steel substrate by adopting a magnetron sputtering method to obtain a silicon steel plate; stacking the multiple layers of silicon steel plates to form a laminated layer; zirconia sol is coated on interlayer contact surfaces of the multiple layers of silicon steel plates; standing at a preset temperature for a preset period of time, so that gelation-dehydration-inorganic conversion of the zirconium oxide sol layer is completed, and an assembled silicon steel plate is obtained; and carrying out post-treatment on the assembled silicon steel plate to obtain the non-oriented silicon steel composite material. The magnetic performance, the mechanical toughness and the low-temperature service reliability of the non-oriented silicon steel material are improved.

This invention relates to the field of metallic materials technology, and more particularly to a negative enthalpy duplex stainless steel material and its preparation method, which possesses high strength, high plasticity, and high corrosion resistance. The negative enthalpy duplex stainless steel material is Fe... a Cr b Ni c Mo d Mn e C f Si g Ti h Al i V j Wherein, a, b, c, d, e, f, g, h, i, and j correspond to the mass percentages of each element: a = 60-70 wt%, b = 15-20 wt%, c = 10-15 wt%, d = 0-5 wt%, e = 1-5 wt%, f = 0.015 wt%, g = 0-1 wt%, h = 0-3 wt%, i = 0-0.5 wt%, j = 0-0.5 wt%, and d, g, h, i, and j are not zero. This series of negative enthalpy duplex stainless steel materials all contain ferrite and austenite in their structure, and the microstructure and mechanical properties of the alloy can be controlled by adjusting the proportions of different metal elements. This series of negative enthalpy duplex stainless steel materials exhibits high strength and high ductility. Simultaneously, negative enthalpy duplex stainless steel materials exhibit excellent corrosion resistance.

The invention relates to the technical field of alloy materials, in particular to a tungsten-zirconium active material and a preparation method thereof. The tungsten-zirconium active material provided by the invention is prepared from the following elements in percentage by mass through a specific preparation method: 55-85% of W, 10-35% of Zr and 3-30% of other elements, and the other elements are more than two of Ti, Nb, Hf and Mo. The content of W is controlled to be 55-85%, so that the density of the material is 11 g / cm < 3 > or above, the high strength of the material is ensured, and the material has kinetic energy penetration capacity; the content of Zr is 10% or above, and it is guaranteed that the material has certain activity; and the addition of other elements such as Ti, Nb, Hf and Mo inhibits the generation of a W2Zr brittle phase, so that the plasticity of the tungsten-zirconium active material is improved. And by combining with a specific preparation method, the prepared tungsten-zirconium active material has high plasticity while having high strength and high density.

The invention relates to the technical field of steel structures, in particular to a hot forming component and a preparation method thereof.The hot forming component comprises, by mass, 0.27%-0.4% of C, 0.3%-0.8% of Si, 1.0%-2.0% of Mn and 0.2%-0.8% of Cr and contains Nb, V, Ni and trace rare earth Ce, V / Nb = 2.0-4.0, and Nb + V + Ni is smaller than or equal to 0.45%, through the synergistic effect of low C and Nb-V-Ni-Ce, the ultra-high strength of the hot forming component is kept, meanwhile, the limit sharp cold bending angle is increased, and the strength of the hot forming component is improved. By accurately controlling the V / Nb ratio and limiting the total amount of Nb, V and Ni, it is ensured that microalloy elements give full play to fine grain strengthening and precipitation strengthening effects, meanwhile, element waste is avoided, trace rare earth Ce is introduced, the inclusion form is improved, the microscopic structure is optimized, and the comprehensive performance of a hot forming component is remarkably improved.

The invention discloses a high-Fe-content and high-comprehensive-performance aluminum alloy and a preparation method thereof.The specific method comprises the following steps that firstly, reasonable smelting and refining processes are adopted, three different modifiers are added to conduct Fe phase modification treatment on waste aluminum materials, and the existence form of the Fe element is controlled; and carrying out homogenization heat treatment and deformation heat treatment to obtain the high-temperature-resistant alloy. Through alloy component design and machining process optimization, the characteristics of morphology, distribution and the like of the Fe-rich phase are changed, phase change of the Fe-containing phase is achieved, the interface behavior of the Fe-containing phase is regulated and controlled, then accurate control over the microstructure of the high-Fe-content aluminum alloy is achieved, and high comprehensive performance is obtained. The high-Fe-content 6XXX series aluminum alloy prepared through the method has excellent mechanical performance and corrosion resistance, the application requirement of the high-quality 6XXX series aluminum alloy can be met, and a new way is provided for high-value utilization of secondary aluminum.

The invention belongs to the technical field of aluminum alloy die-casting, and particularly relates to a high-strength and high-toughness heat-treatment-free die-casting aluminum alloy, a structural part and a preparation method. According to the high-strength and high-toughness heat-treatment-free die-casting aluminum alloy provided by the invention, the limitation that a traditional heat-treatment-free die-casting aluminum alloy is low in Fe element tolerance and the limitation that a traditional high-Fe-content aluminum alloy is insufficient in toughness are broken through by designing an element composition system and multi-strategy cooperative regulation and control of the high-strength and high-toughness heat-treatment-free die-casting aluminum alloy. And by adopting a Ca-Sr composite modification strategy and a Cr-Mn cooperative regulation strategy, the Fe content tolerance is expanded to 0.5 wt%-1.6 wt%, and meanwhile, the recycling rate of waste materials of the die-casting aluminum alloy is high. Based on the synergistic strengthening effect of all elements in the components, the tensile strength and ductility of the high-Fe-content die-casting aluminum alloy can be synergistically improved without heat treatment, the heat-treatment-free die-casting aluminum alloy with high tensile strength and high toughness is obtained, and the heat-treatment-free die-casting aluminum alloy is suitable for preparing deep-cavity shell type, multi-fin heat dissipation type and other complex structural parts.

The invention provides a rare earth modified aluminum alloy for additive manufacturing and a laser powder bed melting preparation method of the rare earth modified aluminum alloy, and belongs to the technical field of aluminum alloy additive manufacturing. The aluminum alloy comprises, by mass, 6.20%-7.00% of Zn, 2.20%-2.80% of Mg, 1.20%-1.80% of Cu, 1.5%-2.5% of Si, 0.12%-0.19% of Zr, 0.12%-0.20% of Er and the balance Al and impurities, Zn / Mg is larger than or equal to 2.5 and smaller than or equal to 3.0, and Zr + Er is larger than or equal to 0.30% and smaller than or equal to 0.36%. The preparation method comprises the steps of vacuum gas atomization powder preparation and laser powder bed melting forming. The cracking tendency of the alloy is greatly reduced under the synergistic effect of Si, Zr and Er elements, multiple strengthening phases and twin crystals are introduced to strengthen the Al-Zn-Mg-Cu alloy, the Al-Zn-Mg-Cu alloy is more suitable for the laser powder bed melting process, and the material system of the additive manufacturing aluminum alloy is enriched. Experimental results show that the crack-free aluminum alloy is prepared within a wide technological parameter range, the yield strength of the printing-state alloy prepared through laser powder bed melting can reach 385 MPa, the tensile strength can reach 468 MPa, and the printing-state alloy has high corrosion resistance.

The invention belongs to the technical field of metal materials, and particularly relates to a high-strength corrosion-resistant heat-treatment-free die-casting aluminum alloy and a preparation method thereof. The aluminum alloy comprises, by mass, 5.5%-7.1% of Mg, 2.5%-3.5% of Si, 0.5%-0.75% of Mn, 0.11%-0.7% of Cu, 0.08%-0.15% of Fe, 0.05%-0.1% of Mo, 0.02%-0.05% of V, 0.01%-0.05% of Zr, 0.03%-0.09% of Y and the balance Al and inevitable impurity elements, the content of a single impurity element is smaller than or equal to 0.02%, and the total content of the impurity elements is smaller than or equal to 0.2%. And the mass ratio of the Mg element to the Cu element in the aluminum alloy components is in the range of (10: 1)-(50: 1). The heat-treatment-free die-casting aluminum alloy provided by the invention is high in yield strength and obvious in weight reduction effect.

Disclosed are a soft magnetic iron-based powder, a preparation method therefor, and a soft magnetic component, which are applicable to various industrial fields such as a core of a motor. According to an embodiment of the disclosed soft magnetic iron-based powder, the powder comprises, in wt %, more than 2% of Si, more than 0.02% of Al, more than 0.05% of Mn, more than 0% and less than 0.1% of O, and the balance being Fe and unavoidable impurities, and satisfies [Si] / [Al]>2, wherein the difference in [Si]+[Al]+[Mn] between D10 and D90 may be less than 10 wt %. [Si], [Al], and [Mn] represent wt % of respective elements.

The application discloses a preparation method of a high-strength cast magnesium alloy, the alloy containing two non-rare-earth strengthening alloy elements of Sr and Ti, wherein the Ti element is preferentially combined with Al to form AlTi or Al3Ti intermetallic compounds and is gathered along the grain boundary, hindering the growth of alpha-Mg grains, the remaining Al element is combined with Mg to form a beta phase, the grain size is reduced, the morphology of the beta phase is improved, and thus the mechanical properties are improved; the Sr element can strengthen the beta phase on one hand, and can consume the Al element at the solidification front by forming a new Al4Sr phase, so that the volume fraction of the beta phase is reduced; in addition, the Sr element can form an adsorption film of strontium on the grain growth interface as a surface active element, so that the grain growth speed is reduced, the alloy has more time to generate more crystal nuclei when solidifying, and the grains are refined; under the synergistic effect of the two elements, the strength of the magnesium alloy is significantly improved.

This application provides a zinc-containing multi-element alloy, its preparation method, a zinc plating method, and metal coated parts, relating to the field of hot-dip galvanizing technology. The chemical composition of the zinc-containing multi-element alloy provided in this application, by weight percentage, includes: 0.005%~0.4% Al, 0.4%~2.0% Ni, 0.1%~0.5% Mn, 0.001%~0.05% Ti, 0.01%~0.1% rare earth metals, and 0.001%~0.05% Si, with the balance being Zn and unavoidable impurities. This application obtains a zinc-containing multi-element alloy by synergistically designing the types and contents of various trace elements such as Al, Ni, Mn, Ti, rare earth elements, and Si. This zinc-containing multi-element alloy achieves a comprehensive effect of improved Ni utilization efficiency, controlled zinc-iron alloy layer growth, and uniform coating structure, thereby significantly improving the corrosion resistance of the coating while reducing its thickness.

Provided are a high-strength hot-rolled steel sheet having high strength, high ductility, excellent strain dispersibility, high stretch flangeability, and bendability, a member, and methods for manufacturing the same.　The high-strength hot-rolled steel sheet has a prescribed component composition, and has a steel structure in which, in terms of area ratio, the total of bainite and tempered martensite is 80.0% or more, pearlite is 10.0% or less, retained austenite is 15.0% or less, the total of retained austenite and pearlite is 1.0% or more, the total of tempered martensite and bainite having a circle-equivalent diameter of 5.0 μm or more is 10.0% or less, and the proportion of line segments having a hard phase fraction of 20.0% or more among line segments having a length of 200 μm parallel to the rolling direction is 30.0% or less, the tensile strength TS (MPa) and the component composition (mass%) satisfy the expression 0 ≦ 730 + 2000 × (C + Si / 16 + Mn / 40 + Al / 18 + Cr / 40 + Ni / 40 + Mo / 20 + Ti / 3) – TS ≦ 250, where each element symbol in the formula represents the content (mass%) of each element, and the high-strength hot-rolled steel sheet has a tensile strength of 980 MPa or more.

The invention relates to the technical field of alloy preparation, particularly provides a 650 DEG C high temperature resistant titanium-based composite material plate, and further provides a preparation method of the plate. The titanium-based composite material plate resistant to the high temperature of 650 DEG C, provided by the invention, is prepared from the following chemical components in percentage by mass: 6.0 percent to 7.0 percent of Al, 1.0 percent to 3.0 percent of Zr, 0.5 percent to 2.0 percent of Mo, 0.4 percent to 1.0 percent of Nb, 0.4 percent to 1.0 percent of W, 0.1 percent to 0.4 percent of Si, 0.4 percent to 0.7 percent of B, 0.01 percent to 0.10 percent of C and the balance of Ti and inevitable impurities. According to the titanium-based composite material component system provided by the invention, a vanadium element which is easy to generate interface reaction at high temperature is abandoned, and refractory metal elements such as niobium and tungsten are adopted to cooperate with a ceramic reinforced phase formed by boron, carbon and the like, so that the high-temperature performance and the thermal stability of the material are improved; meanwhile, by controlling the content of molybdenum, aluminum and other elements within a specific interval, the hot working performance of the material is remarkably improved while high strength is maintained, and the contradiction between insufficient high-temperature performance and poor hot working performance of a traditional titanium-based composite material is effectively solved.

The invention provides a Cu-Ti alloy and a preparation method thereof. The Cu-Ti alloy comprises the following components in percentage by mass: 3.0-3.5 wt% of Ti element, less than or equal to 0.05 wt% of B element, less than or equal to 0.05 wt% of Zr element and the balance of Cu element, the Cu-Ti alloy comprises a beta '-Cu4Ti precipitation phase with the size being 3 nm to 7 nm, a beta'-Cu4Ti precipitation phase with the size being 8 nm to 12 nm and a beta '-Cu4Ti precipitation phase with the size being 13 nm to 20 nm. The precipitated phases comprise microstructures with the size ranges of 3-7 nm, 8-12 nm and 13-20 nm, the microstructures jointly act on an alloy matrix, the strength, plasticity and conductivity of the Cu-Ti alloy material are remarkably improved, and therefore the problem that the Cu-Ti alloy material is difficult to give consideration to excellent strength, conductivity and plasticity at the same time is solved.

The invention discloses a method for improving creep resistance of a rare earth magnesium alloy, which comprises the following steps: S1, casting an ingot blank according to the mass percent of each component (0-6% of Y element, 1-3% of Nd element, 0.1-0.5% of Zr element and the balance of Mg element) in the rare earth magnesium alloy; s2, the ingot blank is subjected to solution treatment; s3, the material obtained after solution treatment is subjected to rolling deformation, the rolling deformation temperature ranges from 450 DEG C to 520 DEG C, the reduction rate ranges from 15% to 25%, and the roller linear speed ranges from 2 mm / s to 200 mm / s; and S4, the rolled and deformed material is subjected to aging treatment, the aging treatment temperature ranges from 180 DEG C to 260 DEG C, and the aging treatment time ranges from 5 h to 70 h. According to the method disclosed by the invention, an originally harmful and unavoidable precipitation-free zone formed along a grain boundary is converted into a precipitation-free zone which is beneficial to creep resistance and is uniformly distributed along an intragranular deformation zone, and the creep resistance is remarkably improved.

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.

This invention relates to an Fe-Ni based alloy with enhanced soft magnetic properties utilizing a medium-range ordered structure and its preparation method. The chemical formula of the alloy is: Fe bal Ni a Cr y Si b B c M d Cu e X f Its microstructure is as follows: the alloy matrix is ​​mainly amorphous, with dispersed atomic-scale medium-range ordered (MRO) clusters comprising 15%–40% by volume. The size of these clusters is controlled between 1 nm and 5 nm, and no long-range crystalline phases larger than 10 nm are formed. By introducing Ni element to couple magnetic moments with Fe to reduce the saturation magnetostriction coefficient, and by using a low-temperature relaxation annealing process to control the pre-precipitation behavior of Cu element, a high-density MRO-reinforced framework is established in the amorphous matrix. This material possesses high saturation magnetic induction, low coercivity, and excellent high-frequency permeability, which can improve the problems of large magnetostriction coefficients and high high-frequency noise in existing high-Bs iron-based nanocrystalline alloys. It is particularly suitable for high-frequency high-power transformers and wireless charging magnetic shielding modules.

The invention relates to the technical field of high-performance aluminum alloy materials, in particular to a high-strength heat-resistant A < l >-Cu alloy based on an interface stabilization strategy and a preparation method thereof.The high-strength heat-resistant A < l >-Cu alloy comprises, by mass, 5.03% of Cu, 0.29% of Sc, 0.22% of Zr, 0.31% of Mn, smaller than or equal to 0.05% of single impurity elements, smaller than or equal to 0.15% of total impurity elements and the balance A < l >; after 1000 hours of thermal exposure at the temperature of 300 DEG C, the tensile strength is still larger than or equal to 300 MPa and is far superior to that of a traditional Al-Cu alloy, back-to-back synergistic segregation of Sc and Mn elements is achieved for the first time, theta '-phase coherent and semi-coherent interfaces are synchronously stabilized, the coarsening path is comprehensively blocked, the utilization rate of the Sc element is increased through the pre-aging technology, premature consumption of the Sc element is avoided, and the actual use cost of the expensive Sc element is reduced.

The application discloses a kind of high plasticity single crystal high-entropy high-temperature alloy without Fe and Ti and a preparation method thereof.The chemical composition of the alloy includes Co, Ni, Cr, Al, Ta, Mo and W seven elements, and the atomic percentage of each element is Co 35-45at%, Ni 30-40at%, Cr 3-5at%, Al 10-13at%, Ta 1-4at%, Mo 1-3ar% and W 3-5at%.The preparation method includes the following steps: sequentially putting elemental Co, Ni, Cr, Ta, Mo and W into the crucible of vacuum induction melting furnace for heating and melting, adding elemental Al when the temperature rises to the refining temperature, and pouring into master alloy ingot;using high-speed solidification Bridgeman method and seed crystal method to prepare single crystal high-entropy high-temperature alloy test rod with <001> grain orientation;and sequentially carrying out solid solution treatment, primary aging and secondary aging on the single crystal high-entropy high-temperature alloy test rod, to obtain the high plasticity single crystal high-entropy high-temperature alloy without Fe and Ti.The single crystal high-entropy high-temperature alloy of the application has the advantages of high-entropy alloy and single crystal high-temperature alloy, and has excellent room temperature and high temperature mechanical properties.

The invention provides a high-strength plastic corrosion-resistant antifouling alloy and a preparation method and application thereof, the general formula of the high-strength plastic corrosion-resistant antifouling alloy is FeaCobCrcNidAleTafCug, 14 < = b < = 16, 18 < = c < = 22, 28 < = d < = 33, 4.5 < = e < = 6.5, 1.5 < = f < = 2.5, 4 < = g < = 10, and the balance of Fe and inevitable impurities, and b, c, d, e, f and g refer to molar percentages of corresponding elements. The high-strength plastic corrosion-resistant antifouling alloy disclosed by the invention has good antibacterial property and corrosion resistance while maintaining excellent mechanical properties, and has good application prospects and large-scale popularization potential in the fields of ocean engineering equipment, shipbuilding or key components of coastal power stations.

Provided are steel having excellent fatigue strength, a method for producing the steel, and a steel component. The steel has a given composition which satisfies the following relationships (1) and (2), the remainder comprising Fe and unavoidable impurities. The core portion contains a precipitate of one or more of Cr, Mo, V, and Nb. The steel has a surface hardness of 700 HV or greater and a surface compressive residual stress of 750 MPa or greater. (1): ([Mo] / 96+[V] / 50.9+[Nb] / 92.9)×1000≥5.5 (2): ([C] / 12+[N] / 14)×1000≥3.5 In the relationships, [X] is the content (mass%) of element X.

The invention discloses a preparation method of mining wear-resistant steel US300N hot-rolled round steel. The preparation method comprises a steelmaking process and a steel rolling process. The hot-rolled round steel comprises the following chemical components in percentage: 0.61 to 0.63 percent of C, 0.70 to 0.75 percent of Mn, 1.75 to 1.85 percent of Si, 0.82 to 0.85 percent of Cr, less than or equal to 0.018 percent of P, less than or equal to 0.010 percent of S, 0.07 to 0.08 percent of Ni, 0.010 to 0.020 percent of Al and the balance of iron and inevitable trace elements. According to the invention, the contents of C, Si and Cr elements are reasonably controlled, the Ni element is added to refine pearlite interlamellar spacing, the size of inclusions and the cleanliness of steel are controlled through a steelmaking process, and the structure transformation and grain size of a hot rolling state are controlled through a steel rolling process, so that the wear-resistant hot-rolled round steel with matched hardness and toughness is obtained.