1712 results about "Ta element" patented technology

The invention relates to the technical field of aluminum alloys, in particular to a high-strength light aluminum alloy and a preparation method and application thereof. The aluminum alloy comprises the following chemical components in percentage by weight: 3.5 to 6.5 percent of Mg, 2.5 to 5.0 percent of Zn, 0.2 to 1.0 percent of Cu, 0.1 to 0.4 percent of Mn, 0.05 to 0.25 percent of Zr, 0.05 to 0.25 percent of Sc, 0 to 0.12 percent of Fe, 0 to 0.12 percent of Si and the balance of Al and inevitable impurity elements. Wherein the mass ratio of Mg to Zn is 1.0-2.0, the total content of Mn, Zr and Sc does not exceed 0.5%, the total content of Zr and Sc does not exceed 0.38%, and the mass ratio of Zr to Sc is 0.6-1.5. By accurately controlling the contents and proportions of elements such as Mg, Zn, Cu, Mn, Zr, Sc and the like, perfect combination of high strength and light weight of the alloy is realized. The density of the alloy is smaller than or equal to 2.72 g / cm < 3 >, the yield strength is larger than or equal to 350 MPa, the tensile strength is larger than or equal to 450 MPa, the ductility is larger than or equal to 10%, the welding coefficient is not smaller than 0.75, and the exfoliation corrosion performance is not lower than the EA level.

The invention relates to the technical field of alloy coatings, and discloses a laser cladding high-entropy alloy coating and a preparation method thereof.The laser cladding high-entropy alloy coating is prepared from, by mass, 25%-45% of Fe, 15%-25% of Cr, 10%-20% of Ni, 5%-15% of Mn, 3%-10% of Al, 0%-5% of Ti, 1%-5% of a nanometer reinforcing phase and 0.1%-0.5% of a flow promoter. Lorentz force generated by an alternating electromagnetic field drives melt convection, so that the diffusion coefficient of segregation-prone elements such as Cr and Ni is increased, the ultrasonic cavitation effect is matched to crush dendritic crystals and promote dispersion of nanoparticles, the segregation index of the elements is reduced, a uniform nanocrystalline-amorphous composite structure is formed through the synergistic effect, and uniform distribution of elements in a molten pool is achieved.

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

The invention discloses a nuclear zirconium alloy cladding high-temperature oxidation resistant composite coating and a preparation method thereof, and belongs to the technical field of nuclear zirconium alloy coatings. According to the preparation method disclosed by the invention, through component gradient structure design, Cr ion pretreatment activation, deposition of a pure Cr inner coating, deposition of a Cr70Al30 intermediate coating and deposition of a Cr50Al50 outer coating are sequentially carried out on the surface of a nuclear zirconium alloy cladding, and the Cr-Cr70Al30-Cr50Al50 composite coating zirconium alloy cladding with a three-layer structure is obtained. According to the method, outward migration of the Al element is effectively limited while the excellent anti-oxidation characteristics of the Cr and Al elements are fully utilized, the coating has the excellent high-temperature oxidation performance, and the requirement for the service performance of the surface coating of the zirconium alloy cladding at the extremely high temperature is met.

The invention discloses die steel powder with high corrosion resistance. The die steel powder comprises the following chemical components in percentage by mass: 17.0%-18.5% of Ni, 8.0%-9.5% of Co, 4.5%-5.0% of Mo, 1.8%-2.5% of Cr, 0.4%-0.7% of Cu, 0.06%-0.12% of Y, 0.6%-0.9% of Ti, 0.06%-0.12% of Al and the balance of Fe. The invention further discloses a gas atomization preparation method of the high-corrosion-resistance die steel powder. The gas atomization preparation method comprises the following steps: (1) burdening and charging; (2) vacuumizing and gas replacement; (3) staged smelting: carrying out medium-frequency induction heating on the smelting crucible, raising the temperature to 1650-1720 DEG C at the speed of less than or equal to 10 DEG C / min, and keeping the temperature for 15 minutes after the matrix alloy is molten; adding high-purity elemental metals of Y, Ti and Al elements through a secondary feeding device 5-8 minutes before pouring is started, and realizing uniform diffusion of the elements by matching with argon covering and stirring; (4) argon atomization; and (5) powder post-treatment. According to the powder, the corrosion resistance is greatly improved by reasonably designing the components and the percentage thereof. According to the powder obtained through the gas atomization preparation method, the corrosion resistance is larger than or equal to 700 hours, the oxygen content is smaller than or equal to 50 ppm, the density is larger than 99.8%, and therefore the requirements of high-end optical molds are met.

The invention relates to a corrosion-resistant alloy welding wire, in particular to an ERNi CrMo-3 corrosion-resistant alloy welding wire and a preparation method thereof. The steel comprises the following chemical components in percentage by mass: greater than or equal to 64% of Ni, 21%-23% of Cr, 8.5%-10% of Mo, less than or equal to 0.2% of Fe, 0.1%-0.3% of Ti, 0.1%-0.25% of Al, 3.5%-4.15% of Nb, less than or equal to 0.2% of Cu, less than or equal to 0.02% of C, less than or equal to 0.5% of Mn, less than or equal to 0.35% of S i, less than or equal to 0.005% of S and less than or equal to 0.005% of P. By adopting vacuum induction melting and electroslag remelting, the content of all elements in the alloy can be accurately controlled, the content of impurity elements (H, O, N, S, P and the like) is effectively reduced, the content of oxygen and nitrogen is controlled to be not larger than 20 ppm, alloy components are more uniform and stable, and therefore the corrosion resistance and the high-temperature mechanical property of the welding wire are improved.

The invention relates to an AB2 type hydrogen storage alloy and a preparation method and application thereof, the AB2 type hydrogen storage alloy comprises a matrix metal and a second metal, and the composition general formula of the matrix metal is Ti Zr Cr < c > Mn < d >; wherein 0.76 < = a < = 0.9, 0.16 < = b < = 0.24, 0.76 < = c < = 0.84, 1.05 < = d < = 1.2, and a + b + c + d = 3; and the second metal is metal except Ti, Zr, Cr and Mn. The composition of the matrix metal in the AB2 type hydrogen storage alloy is limited, the number of atoms of all elements is limited, meanwhile, the second metal is added, the prepared AB2 type hydrogen storage alloy is high in effective hydrogen storage capacity and small in hydrogen absorption and desorption platform hysteresis, and the high hydrogen storage capacity can still be kept after 3000 times of hydrogen absorption and desorption circulation.

The invention discloses a high-heat-resistance and high-conductivity copper alloy and a preparation method and application thereof. The copper alloy comprises 0.001 wt%-0.01 wt% of Ag; the content of P is 0.0005 wt%-0.002 wt%; the copper alloy comprises the following components in percentage by weight: 0.003 to 0.008 percent of X and the balance of Cu and impurities. The preparation process of the high-heat-resistance and high-conductivity copper alloy comprises the steps of smelting, casting, continuous extrusion, solid solution treatment, drawing, low-temperature annealing, sizing and packaging. The preparation method comprises the following steps: proportioning and smelting according to the mass percent of each element of the copper alloy; and in the low-temperature annealing process, the annealing temperature is 150-350 DEG C, and the heat preservation time is 2-10 h.

The invention discloses a neodymium-iron-boron magnet and a preparation method thereof. Raw materials of the neodymium-iron-boron magnet comprise a neodymium-iron-boron magnet base body and slurry containing a heavy rare earth element RE '. The component composition of the neodymium iron boron magnet base body is REx (Fe < 100-a > Ma) < 100-x-y > By, wherein RE is at least two of La, Ce, Pr and Nd and certainly contains Pr, and the mass of Pr in RE accounts for 25%-35% of the total mass of RE; m is selected from at least one of Co, Cu, Al, Nb, Ti, Zr and Ga; a, x and y represent numerical values obtained by multiplying the weight percentage of each element by 100, 28.5 < = x < = 31, 0.85 < = y < = 1.02, and 1.9 < = a < = 4.4; rE'is at least one of Pr, Gd, Tb, Dy, Ho and Er. After raw materials are made into neodymium iron boron alloy powder, a neodymium iron boron magnet base body is obtained through magnetic field forming, sintering and aging treatment, then the surface of the magnet base body is coated with slurry, elements in the slurry permeate into the interior from the surface of a flaky magnet through grain boundary diffusion, and the neodymium iron boron magnet is obtained. The use of heavy rare earth elements can be reduced, and meanwhile, the magnetic performance of the magnet is 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 discloses a preparation method of a high-strength, high-hardness and ablation-resistant CuWTaTeAl gradient nano composite material. The method comprises the following steps: 1, mechanically mixing Cu80Al20 spherical coated powder, Cu90W10 spherical coated powder, WTe2 alloy powder, Ta powder and Cu powder, and then carrying out ball milling and mixing; 2, performing SPS (spark plasma sintering); thirdly, after soaking treatment, multi-pass hot rolling deformation is carried out, and then quenching treatment is carried out; and 4, annealing heat treatment. The binary spherical coating powder, the alloy powder and the elementary substance powder are subjected to ball milling and mixing to achieve uniform distribution of all elements, high-melting-point W and Ta are added to improve the ablation-resistant temperature of the composite material, large-scale copper dendrite powder is added to form gradient distribution nanocrystals, the proportion of all the elements is controlled, the lattice distortion degree is increased, and the ablation-resistant temperature of the composite material is improved. The high-strength, high-hardness and ablation-resistant CuWTaTeAl gradient nano composite material is suitable for the fields of contacts, switches, electrical connectors, resistance welding electrodes and the like.

The invention discloses a low-temperature high-toughness austenitic stainless steel welding wire and a preparation method thereof, and relates to the technical field of welding materials, in particular to a welding wire with high-toughness mechanical properties of formed cladding metal in a low-temperature environment and a preparation method of the welding wire. The Ti element is introduced into the welding wire, the dosage relation of the Al element and the Ti element is controlled, and the mass ratio of Al to Ti is kept to be (5-10): 1; a proper amount of Al element can play a role in purifying a molten pool during welding work, a proper amount of Ti element can effectively stabilize an austenite phase, and therefore it is guaranteed that the welding wire has the basic welding capacity, and meanwhile after the welding wire is converted into cladding metal, the welding wire is not prone to deformation. The material characteristics and the like of the material can meet the use requirements at room temperature and ultralow temperature environment, that is, the material has and keeps good tensile property, impact property and the like, so that pipelines, containers and the like prepared from the material can be used for transmitting or loading special low-temperature materials such as liquid hydrogen, liquid helium and the like.

The invention relates to the technical field of metal smelting, and particularly discloses a preparation method of a high-purity IN718 alloy material. According to the method, on the premise that the mechanical property result redundancy of the IN718 alloy material is large, the content of inclusions and formation of carbides in the steelmaking process are reduced by optimizing the content of C, N and Nb elements in the vacuum induction melting process, reducing the refining temperature and reducing the melting speed of vacuum self-consuming remelting; and in cooperation with two-heating-number upsetting and drawing deformation in the forging process, the situation that carbides in the IN718 alloy material are dispersed unevenly due to segregation is avoided. According to the high-purity IN718 alloy material and the preparation method thereof, the content of carbides in steel ingots is remarkably reduced by controlling all parameters in the duplex process, the overall level of the carbides in the high-purity IN718 alloy material is smaller than or equal to 2.0 level after homogenizing diffusion annealing, forging, machining and heat treatment, the purity of the existing IN718 alloy material is improved, and the use requirements of special equipment such as deep sea equipment and nuclear power equipment can be met.

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.

The invention relates to the technical field of metal material manufacturing, and discloses a manufacturing process of a super-strong wear-resistant tire protection chain, which comprises the following steps of: forming a chain link blank by adopting high-silicon high-manganese bainite steel through hot rolling and hot die forging; the core of the method is an integrated heat treatment step, specifically, surface functionalization co-permeation of copper and cerium elements is synchronously carried out in the austenitizing stage, then bainite isothermal quenching is carried out, and a composite structure of bainite and stable retained austenite is obtained in a matrix; the process further comprises the steps that a special high-toughness welding wire is adopted for welding, and local tempering treatment is conducted on a welding seam; by means of the scheme, the chain link is endowed with excellent obdurability and fatigue resistance through the phase transformation induced plasticity effect of the base body, the abrasion resistance is remarkably improved through the surface functionalization co-cementation layer, and the reliability of a joint area is ensured through accurate welding and postweld treatment. The technical problems that wear resistance and toughness of a traditional protection chain are difficult to consider at the same time, and a welding joint is prone to failure are systematically solved.

The invention discloses a high-temperature wear-resistant crack-free high-entropy alloy and a preparation method and application thereof, the molecular formula of the alloy is as follows: Fe < 11.9 > Co < 23.8 > Cr < 23.8 > Ni < 35.7 > Nb < 4.8 >, and a Laves phase exists in the microstructure of the alloy. The preparation method comprises the following steps: putting weighed powder into a ball milling tank for ball milling, uniformly mixing the powder, and then drying, sieving and drying for storage; 304L stainless steel is selected as a base material, a sand mill is used for polishing the surface of the base material so as to remove surface oxide skin until a bright surface is exposed, and oil stains on the surface are cleaned; and the dried powder is placed in a powder feeding tank in a laser system, high-purity Ar gas is used for feeding the powder to a round spot laser head for melting and stacking, and the high-temperature wear-resistant crack-free high-entropy alloy without cracks is formed through layer-by-layer continuous deposition. By adding the Nb element, a Laves phase capable of improving the high-temperature performance is formed in a matrix, a high-entropy alloy sample is prepared through the laser directional energy deposition technology, subsequent heat treatment does not need to be conducted on the high-entropy alloy sample, and the deposited alloy has the excellent wear resistance at the high temperature.

Provided is a non-magnetic austenitic stainless steel. According to an embodiment of the disclosed non-magnetic austenitic stainless steel, the non-magnetic austenitic stainless steel includes, in percent by weight (wt %), 0.01 to 0.1% of carbon (C), 1.5% or less (excluding 0) of silicon (Si), 0.5 to 3.5% of manganese (Mn), 16 to 22% of chromium (Cr), 7 to 15% of nickel (Ni), 3% or less of molybdenum (Mo), 0.01 to 0.3% of nitrogen (N), and the remainder of iron (Fe) and inevitable impurities, wherein a value of Expression (1) below is a negative value: (1) 3*(Cr+Mo)+5*Si−65*(C+N)−2*(Ni+Mn)−28, wherein in Expression (1), Cr, Mo, Si, C, N, Ni, and Mn denote contents (wt %) of the alloy elements, respectively.

The invention provides a low-cost nickel-based high-temperature alloy and a preparation method thereof. The low-cost nickel-based high-temperature alloy comprises the following components in percentage by weight: 55%-65% of Ni, 12%-18% of Cr, 8%-15% of Fe, 3%-7% of Mo, 1%-3% of Al, 0.5%-2% of Ti, 0.5%-2% of Nb, 0.01%-0.1% of B and the balance of inevitable impurities. According to the low-cost nickel-based high-temperature alloy and the preparation method thereof, by reasonably adjusting alloy components, the usage amount of expensive elements such as cobalt and tungsten is reduced, meanwhile, relatively cheap iron is ingeniously used for replacing part of nickel, on the premise that the alloy performance requirement is met, the raw material cost is greatly reduced, and the alloy is high in tensile strength and good in mechanical property. And the anti-oxidation performance is good, and the use requirements under numerous medium-high temperature working conditions, such as manufacturing of key parts of equipment such as industrial boilers and heat exchangers, can be met.

The invention provides a cast rare earth magnesium alloy and a preparation method thereof, and relates to the technical field of magnesium alloys. The cast rare earth magnesium alloy is prepared from the following elements in percentage by mass: 4.5 to 6.50 percent of Gd element, 0.5 to 2.0 percent of Y element, 0.05 to 1.2 percent of Nd element, 0.05 to 0.5 percent of Er element, 0.3 to 1.2 percent of Zn element, 0.3 to 0.6 percent of Zr element, less than or equal to 0.1 percent of total content of inevitable impurities, less than 0.05 percent of single impurity and the balance of Mg element. By adding the Gd element, the Y element, the Nd element and the Er element, the basal texture of the magnesium alloy can be weakened, and the plasticity is improved. And the content of each element is controlled within the range, so that the interaction among the elements can be improved, and the magnesium alloy can realize good strength and plasticity synergy.

An austenitic Fe—Ni—Cr alloy has superior oxidation resistance even under extreme high temperatures and includes, in mass %: C: 0.004 to 0.13%, Si: 0.15 to 1.0%, Mn: 0.03 to 2.0%, P:≤0.040%, S:≤0.003%, Ni: 20.0 to 38.0%, Cr: 18.0 to 28.0%, Mo:≤1.0%, Cu:≤1.0%, N:≤0.03%, B:≤0.01%, Al: 0.10 to 1.0%, at least one of Ti: 0.10 to 1.0% and Zr: 0.01 to 0.6%, O: 0.0002 to 0.0030%, Ca:<0.002%, total weight of one or more from La, Ce, and Y: 0.001 to 0.010%, Fe as a remainder and inevitable impurities, and wherein the chemical composition satisfies formulae (1) and (2): 85≥0.3×Si+1.5×Ni+1.3×Cr+5.8×Al+7.7×Zr +2.7×Ti+2173×REM −3582×S ×32.9×Mo -2448×B≥47 . . . (1) 40≥0.6×Si+1.3×Cr +23.53×Al+5.88×Ti+3074×REM −5067×S −0.8×Mn −816×N≥. . . (2), and each element symbols indicates content of each element.

The invention belongs to the field of magnesium alloy surface treatment, and particularly relates to a magnesium alloy surface damp-heat-resistant, corrosion-resistant and mildew-proof multifunctional coating and preparation and application thereof. The damp-heat-resistant, corrosion-resistant and mildew-proof multifunctional coating on the surface of the magnesium alloy comprises an inner layer and an outer layer, wherein the inner layer is a micro-arc oxidation layer containing Ta, Sn and Sb elements, and the outer layer is an epoxy resin organic coating containing modified conductive mica powder. The multifunctional coating is used for improving the damp-heat resistance, corrosion resistance and mildew resistance of the surface of the magnesium alloy in the harsh marine atmospheric environment. The method is simple in technological process, convenient to operate, capable of forming a damp-heat-resistant, corrosion-resistant and mould-corrosion-resistant coating on the surface of the magnesium alloy, environmentally friendly, remarkable in application value and capable of meeting the actual requirements for novel multifunctional magnesium alloy materials in the fields of aerospace, ocean engineering and the like.

The invention relates to the technical field of secondary aluminum-silicon alloys, in particular to a preparation method of a heat-treatment-free secondary aluminum-silicon alloy. An Mn element and a Cr element are adopted for conducting iron-rich phase modification on the iron-containing secondary aluminum-silicon alloy, and the secondary aluminum-silicon alloy comprises, by mass, 10.0%-12.0% of Si, 1.0%-3.0% of Cu, 0.8%-1.1% of Fe, 0.5%-3.0% of Cr, 0.1%-2.0% of Mn, smaller than 0.30% of Mg, smaller than 2.0% of Zn, smaller than or equal to 0.18% of inevitable impurities and the balance aluminum. The composite modifier is composed of an intermediate alloy containing Mn and Cr elements, the mass ratio of the Mn element to the Cr element in an alloy melt is 0.1-1.5, and the ratio of the mass sum of the Mn element and the Cr element in the alloy melt to the mass of the Fe element is 2.8. By adding the composite modifier, the morphology of the iron-rich phase in the secondary aluminum-silicon alloy is effectively modified, and meanwhile, the eutectic Si phase is regulated and controlled, so that the purposes of refining the alloy structure and improving the mechanical property of the material are achieved.

To provide a calcined body that is processed easier than a conventional calcined body and where differences in hardness between production lots are suppressed.SOLUTION: A calcined body comprises: at least one first transition metal element selected from the group consisting of manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), molybdenum (Mo), technetium (Tc), ruthenium (Ru), rhodium (Rh), palladium (Pd), and silver (Ag); a coloring element of at least one of a lanthanoid rare earth element and a second transition metal element different in kind from the first transition metal element; and zirconia containing a stabilizing element. A content of the first transition metal element is 100 mass.ppm or more, a content of the second transition metal element is less than 100 mass.ppm, and an absolute value of a difference in hardness relative to a hardness of a calcined body obtained from a commercially available powder is 10 HV or less.SELECTED DRAWING: None

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 neodymium iron boron magnet and a preparation method thereof, and belongs to the technical field of magnetic materials. The neodymium-iron-boron magnet comprises rare earth elements R, transition metal elements T, metal elements M and B elements, the R comprises Pr and Nd, the mass percent of the R is 29-32 wt%, the R comprises heavy rare earth elements Tb and Dy with the mass percent being 0-0.1 wt%, the M at least comprises Ti and Zr, and the sum of the mass percent of Ti and the mass percent of Zr is 0.1-0.6 wt%; t comprises Fe, or Fe and Co; the mass percent of the B is 0.84 wt%-0.94 wt%; the neodymium-iron-boron magnet is provided with a main phase and a grain boundary phase comprising a rare earth-rich phase, the proportion of the rare earth-rich phase to the grain boundary phase is 0.15-0.35, and the atom proportion of Pr in R in the rare earth-rich phase is 0.4-0.5. The neodymium-iron-boron magnet disclosed by the invention has excellent magnetic performance under the condition of no heavy rare earth or low heavy rare earth elements.

The martensitic stainless steel material according to the present disclosure satisfies a chemical composition described herein, and satisfies Formula (1). The yield strength is 758 to less than 862 MPa. In the martensitic stainless steel material, a number ratio of Mg oxides having an equivalent circular diameter of 2.0 μm or more with respect to Ca oxides having an equivalent circular diameter of 2.0 μm or more, Ca sulfides having an equivalent circular diameter of 2.0 μm or more, and the Mg oxides having an equivalent circular diameter of 2.0 μm or more is 40.0% or more.0.001≤Ca+ Mg≤0.005(1)Where, a content of a corresponding element in percent by mass is substituted for each symbol of an element in Formula (1).

A product includes a material having aluminum and at least one rare earth element (REE). The material includes the following microstructure features: at least 1 volume % particles of a phase of an aluminum-rare earth element alloy, the particles comprise at least 5 weight % of the at least one rare earth element, the particles have an average aspect ratio less than or equal to 5, and an average interparticle spacing between the particles is less than or equal to 1 μm. A method includes forming a base material, the base material having aluminum and at least one rare earth element (REE), and working the base material to form a product.

The invention relates to the technical field of petrochemical equipment, and discloses a Ni-Cr-Mo corrosion-resistant alloy seamless tube for petrochemical equipment and a manufacturing method, the seamless tube comprises the following components: C < = 0.01%, Si < = 0.05%, Mn < = 0.30%, P < = 0.015%, S < = 0.005%, 22.2-24.0% of Cr, 16.0-17.0% of Mo, T < = 0.10%, A < l > < = 0.30%, 1.3-1.9% of Cu, Co < = 0.50%, Fe < = 1.5%, Nb < = 0.10%, W < = 0.40%, N < = 58.0%, and the sum of the components is 100%. By accurately controlling the proportion of alloy components and strictly limiting the contents of elements such as carbon, silicon, phosphorus and sulfur, key elements such as chromium, molybdenum and nickel are reasonably blended. Wherein the carbon content is strictly controlled not to exceed 0.01%, so that the precipitation of carbides is effectively avoided, and the intergranular corrosion resistance is improved; and the chromium content is controlled to be 22.2-24.0%, so that the oxidation resistance and the corrosion resistance are enhanced. All the elements have a synergistic effect, so that the alloy seamless tube has high strength, good toughness and excellent corrosion resistance, and can stably work in a high-temperature and high-pressure petrochemical environment accompanied by a strong corrosive medium.

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.