39results about How to "Good solid solution strengthening" patented technology

The invention discloses a low-welding crack sensitivity steel board and manufacturing method, which comprises the following parts: not more than 0.07% C, 0.15-0.40% Si, 1.00-1.60% Mn, not more than 0.015% P, not more than 0.010% S, not more than 0.30% Cu, not more than 0.50% Ni, not more than 0.30% Cr, not more than 0.30% Mo, not more than 0.08% V, not more than 0.08% Nb, 0.010-0.020% Ti, not more than 0.003% B, Fe and inevitable impurity. The invention is characterized by the following: (1)displaying lower welding crack sensitivity component with Pcm not more than 0.20%; (2)mating the strength and flexibility reasonably with fitful yielding ratio; (3)making the price and property of the steel board superior to the congeneric import product; (4)making the maximum breadth of steel board to 4000mm; (5)simplifying the technique to ensure higher flatness without quenching water.

The invention discloses a plastic mold steel which comprises the following chemical components in percentage by weight: 0.25-0.29% of C, 1.30-1.50% of Mn, 0.40-0.60% of Si, 1.20-1.50% of Cr, 0.40-0.50% of Mo, 0.02-0.05% of Nb, less than or equal to 0.15% of Ni, less than or equal to 0.15% of Cu, less than or equal to 0.020% of P, less than or equal to 0.015% of S, less than or equal to 0.012% of N and the balance of iron and inevitable impurities. In the manufacture method of the plastic mold steel, a quenching and tempering heat treatment process is not used, and direct air cooling after forging is carried out, thus prehardened plastic mold steel with thickness above 600 mm and uniform hardness from core to surface is manufactured. According to the plastic mold steel disclosed by the invention, the limit that the existing non-quenched and tempered mold steel has thickness smaller than 400 mm is overcome, and the requirements of mold industries on low-cost high-quality large-sized prehardened plastic mold steel are reached.

The invention discloses a rare earth-contained heat-resistant magnesium alloy and a preparation method thereof, belongs to the technical field of magnesium alloy preparation. The heat-resistant magnesium alloy disclosed by the invention comprises the following materials by weight: 2 to 8 percent of Sm, 0.5 to 6 percent of Gd, 0.1 to 2 percent of Zn, 0.1 to 1.5 percent of Zr, and Mg and inevitable impurity elements in balancing amount, wherein the total weight of the impurity elements is equal to or smaller than 0.02 percent. By adding ally elements (Sm, Gd and Zn) to replace Y and Nd of WE series alloies, and adjusting corresponding heat treatment processes to ensure that the prepared magnesium alloy has excellent indoor temperature intensity, high-temperature strength and plasticity, the indoor temperature intensity, high-temperature strength and plasticity of the magnesium alloy prepared according to the preparation method are more excellent than those of the conventional WE series commercial magnesium alloies; the preparation method of the magnesium alloy prepared according to the preparation method is lower than that of the conventional WE series commercial magnesium alloies. The process is simple; industrialized application is facilitated.

The invention provides a degradable corrosion-resistant high-toughness Zn-Fe-X zinc alloy for a human body and application thereof and relates to the field of medical implant materials. The zinc alloy contains a Zn element, a Fe element and an X element, wherein the X element is at least one of Mg, Ca and Sr, the mass percent of Zn element is 89.92-99.997%, the mass percent of Fe element is 0.002-10%, and the mass percent of X element is 0.001-0.08%. According to the zinc alloy provided by the invention, the cost of added materials is low, degradation products of all ingredients of a prepared alloy material can be degraded through human body metabolism, the corrosion resistance is far higher than that of a magnesium alloy, the degradation rate is greatly lowered, a longer-time mechanical support can be provided, and the strength and toughness of the alloy material are good.

The invention discloses 690 MPa grade high-strength low-yield-ratio medium-manganese steel medium-thickness steel and a manufacturing method, and relates to the technical field of steel smelting. Thesteel comprises the following chemical components of, in percentage by mass, 0.05%-0.10% of C, 4.1%-4.7% of Mn, 0.15%-0.4% of Si, less than or equal to 0.010% of P, less than or equal to 0.003% of S,0.01%-0.05% of Ti, less than or equal to 0.6% of Ni + Cr + Mo, and the balance Fe and inevitable impurities. The requirements of ultra-high strength steel safety performance and construction cost in acomplex environment in the field of engineering machinery can be met.

The invention discloses an ultrahigh steel Q960E thick plate, and relates to the field of ultrahigh-strength steel thick plate producing and manufacturing. The ultrahigh steel Q960E thick plate comprises chemical components including, by mass percent, 0.15%-0.18% of C, 0.20%-0.50% of Si, 0.80%-1.30% of Mn, smaller than or equal to 0.010% of P, smaller than or equal to 0.003% of S, 0.30%-0.50% of Cr, 0.40%-0.60% of Mo, 0.80%-1.0% of Ni, 0.008%-0.030% of Ti, 0.015%-0.050% of Nb, 0.0008%-0.0025% of B and the balance Fe and inevitable impurities. The medium-high carbon and alloying component design is adopted, controlled rolling and offline heat treatment methods are adopted for assistance, and the ultrahigh-strength steel thick plate with the thickness being 90 mm is provided.

The invention discloses a material of a stirring head for friction stir welding and a preparation method thereof, and relates to the technical field of the friction stir welding. The material of the stirring head is prepared from W, 10%-20% by weight of Re and 0.3%-1.0% by weight of ZrC. By adding the nano ZrC into the material of the stirring head, the cost can be effectively reduced on the basisof ensuring the mechanical property and the high-temperature wear resistance of the material. According to the preparation method, it is ensured that the added ZrC material can exist in a nanometer form, and stress concentration can be effectively avoided due to good high-temperature stability of the ZrC material.

The invention relates to a high-strength and heat-resisting rare earth aluminum alloy containing rare earth samarium and a preparing method of the high-strength and heat-resisting rare earth aluminumalloy and belongs to the technical field of alloys. The aluminum alloy comprises the following components including, by mass percent, 5%-6% of Zn, 2%-3% of Mg, 1%-2% of Cu, 0.1%-0.2% of Sm and the balance Al and inevitable impurities. Various second phases, uniform and fine microstructures and weak base plane textures are evenly distributed in the alloy, and therefore the alloy can have high strength and high plasticity. The invention further discloses a preparing method of the high-strength and heat-resisting rare earth aluminum alloy material, nano-order and micron-order second phases and grains with the size being relatively fine are evenly distributed in the tissue of the prepared aluminum alloy, and the mechanical performance of the aluminum alloy is obviously improved.

The invention discloses novel platinum-based high-temperature resistance strain alloy and a preparation method thereof. The alloy is prepared from the following chemical components in percentage by mass: 15 to 40 percent of Rh, 4 to 10 percent of Mo, 2 to 8 percent of Re, 0.5 to 3 percent of Cr, and the balance of Pt. The alloy can also be added with 0 to 2 percent of M (M is at least one of Ni, Zr, Y and Sc). A finish product is prepared by adopting the processes of preparing an alloy ingot in a high-frequency induction smelting furnace, hammer cogging at a high temperature, performing stableheat treatment and the like. The alloy material has high tensile strength and electrical resistivity, low resistance temperature coefficient, excellent high-temperature mechanical properties and oxidation resistance, and resistance-temperature characteristic is linear in the temperature range of 0 to 1,050 DEG C, the novel platinum-based high-temperature resistance strain alloy can be widely applied to the stress-strain test of a hot end component at over 1,000 DEG C in the fields, such as spaceflight, aviation, heavy machinery, petrochemical industry and nuclear industry, and ensures the safety and reliability of an operating system.

The invention relates to a preparation method for Fe-Mn-Al alloy, and belongs to the technical field of lightweight and high strength alloy preparation. The preparation method comprises the steps that by weight, 12.0-14.0% of Al, 18.0-30.0% of Mn and the balance Fe are mixed evenly and proportionally; mixed powder is subjected to tabletting and then is smelted under the protection of inert gas, melts are continuously stirred in the smelting process, and when the temperature of alloy melts reaches 1520-1550 DEG C, a water-cooling copper mold is adopted to cast a sample; the obtained sample is subjected to heat preservation at the 1000 DEG C for 2-3 hours under the protection of inert gas and then subjected to oil quenching, alloy after oil quenching continues to be heated to 550-650 DEG C at the atmosphere of inert gas and subjected to tempering treatment, after heat preservation is conducted for 2-4 hours, the alloy is cooled to the indoor temperature along with a furnace, and the Fe-Mn-Al lightweight and high strength alloy is obtained. The method is relatively simple and reliable, and the prepared Fe-Mn-Al alloy is high in strength, light, good in oxidation resistance and good in corrosion resistance.

The invention discloses a near-beta type titanium alloy with good matching of strength and plasticity and a preparation method thereof, and belongs to the field of titanium alloys. According to the preparation method, medium-sized crystal grains in the sintered alloy are crushed and refined after upsetting, drawing and cogging in a single-phase region. Then a rolled bar is subjected to one-step quasi-beta bar rolling at a phase transformation point by utilizing a relatively high phase transformation point caused by high oxygen content of the alloy, crystal grains are crushed again, and a coordinated structure of non-uniform crystal grains and a multi-stage layered second phase is realized by virtue of dynamic precipitation and partial recrystallization of the second phase under the actionof thermal coupling. Non-uniform mixed crystals comprise ultrafine beta crystal grains and coarse beta crystal grains, and the multi-stage layered second phase comprises a layered primary alpha phase,a strip-shaped grain boundary alpha phase and a beta transformation structure. After short-time heat treatment, the non-uniform mixed crystal structure is reserved, the multi-stage layered second phase is increased from ternary to quaternary through the separated fine-needle-shaped alpha phase, and the alloy maintains good plasticity while having high strength.

The invention relates to a powder metallurgy preparation method of a Fe-Mn-Al series alloy, and belongs to the technical field of powder metallurgy preparation. The powder metallurgy preparation method comprises the steps that firstly aluminum powder, manganese powder and iron powder are evenly mixed to obtain Fe-Mn-Al mixed powder; under the protection of argon, the obtained Fe-Mn-Al mixed powderis smelted to be qualified alloy liquid, then the alloy liquid is injected into a tundish located above an atomizing nozzle, the alloy liquid flows out from a leakage hole in the bottom of the tundish and encounters high-speed argon airflow with the pressure being 6 MPa to be atomized to be small droplets when passing through an HK-03 type annular hole nozzle, the atomized droplets are rapidly solidified in a closed atomizing cylinder to be Fe-Mn-Al alloy powder, and the Fe-Mn-Al alloy powder passes through a label screen which is 100 meshes; and the obtained Fe-Mn-Al alloy powder is subjected to pressing forming, in the hydrogen environment, temperature is improved to 800-1200 DEG C and sintering is conducted for 4-8 h, after sintering is completed, furnace cooling is conducted till thetemperature reaches the room temperature, and a block-shaped Fe-Mn-Al alloy is obtained. According to the powder metallurgy preparation method, the corrosion resistance, the specific strength, the high-temperature oxidation resistance and the like of the obtained Fe-Mn-Al alloy are greatly improved.

The invention provides an equiaxial high-strength zirconium alloy and a preparation method thereof, and belongs to the technical field of alloys. The equiaxial high-strength zirconium alloy comprises strengthening elements and the balance Zr; on the basis of the mass of the equiaxial high-strength zirconium alloy, the strengthening elements comprise 0.1%-3% of Sn and 0.5%-4.5% of Hf; and the equiaxial high-strength zirconium alloy is composed of a phase including equiaxial alpha grains. The zirconium alloy contains a certain amount of Sn element, the Sn element can enter a Zr matrix, so that replacement solid solution strengthening is realized; when the content of the Sn element is relatively high, the excessive Sn element can generate Zr4Sn second-phase particles, so that a second-phase strengthening effect is achieved; Hf further has a solid solution strengthening effect; all the elements are matched, so that the zirconium alloy has high strength; and Ti is continuously added on the basis of the strengthening elements, Ti and Zr can form an infinite solid solution, and the strength of the zirconium alloy can be further improved.

The invention discloses a powder metallurgy preparation method for a Ni-Cr-Al-Fe high-temperature alloy, and belongs to the technical field of high-temperature alloys. According to the powder metallurgy preparation method, Ni-Cr-Al-Fe alloyed powder is obtained through a gas atomization method, a nano-powder body is extruded into blocks, sintering is conducted in the hydrogen environment through avacuum double-tube heating furnace, thus Ni-Cr-Al-Fe alloying is achieved again, and the Ni-Cr-Al-Fe blocky alloy is obtained. During sintering, oxidation of powder is effectively reduced through using of reductive gas, generating of other oxide impurities is reduced, the grains of the Ni-Cr-Al-Fe high-temperature alloy prepared through a nanotechnology are refined, meanwhile, chemical propertiessuch as corrosion resistance, specific strength and high-temperature oxygen resistance of the Ni-Cr-Al-Fe high-temperature alloy are greatly improved, and the application requirements of gas turbinescan be met.

The invention discloses a preparation method of a Ni-Cr-Al-Fe-series high-temperature alloy, and belongs to the technical field of a high-temperature alloy. The method comprises: uniformly mixing ironpowder, chromium powder, aluminium powder and nickel powder via ball milling to obtain a mixed material; in a condition with the pressure in a range of 20-50 MPa, performing sheeting moulding on themixed material to obtain a metal sheet, putting the metal sheet in a vacuum electric arc melting furnace, in a condition with an argon protection atmosphere and electromagnetic stirring, performing electric arc melting till the temperature of the alloy solution is 1540-1560 DEG C, and performing water-cooling copper-formed mold casting to obtain an alloy A; and putting the alloy A in an argon atmosphere, performing thermal insulation at 1200-1250 DEG C for 0.5-1.5 h, performing oil hardening, putting the obtained product in an argon atmosphere, performing heating till the temperature reaches 550-650 DEG C, performing tempering treatment for 3-6 h, and cooling the furnace to the room temperature to obtain the Ni-Cr-Al-Fe-series high-temperature alloy. The prepared Ni-Cr-Al-Fe-series high-temperature alloy is high in tensile strength, elongation percentage and yield strength and can meet the application requirement of a gas turbine.

The invention discloses medium carbon ferromanganese medium-thick steel for 800MPa engineering machinery and a manufacturing method of the medium carbon ferromanganese medium-thick steel, and relatesto the technical field of iron and steel smelting. The medium carbon ferromanganese medium-thick steel comprises the chemical components in percentage by mass of 0.05%-0.08% of C, 4.8%-5.8% of Mn, 0.10%-0.35% of Si, P being smaller than or equal to 0.010%, S being smaller than or equal to 0.003%, 0.01%-0.05% of Ti, 0.7%-1.2% of Ni+Cr+Mo, and balance Fe and inevitable impurities. The medium carbonferromanganese medium-thick steel can have excellent core mechanical properties than common 800MPa high-intensity structural steel, and requirements for extra-high-intensity steel safety performance and low manufacturing cost in the engineering machinery trade under complete adverse environment, can be met.

The invention relates to the technical field of metallurgy, in particular to low-carbon, low-phosphorus, low-aluminum, high-nitrogen and ultralow-sulfur steel and a preparation method thereof.The low-carbon, low-phosphorus, low-aluminum, high-nitrogen and ultralow-sulfur steel comprises C, Si, Mn, P, S, Alt, N, Ni, V and the balance Fe and inevitable impurities; the method comprises the steps that molten iron of the low-carbon, low-phosphorus, low-aluminum, high-nitrogen and ultralow-sulfur steel is obtained; the molten steel is sequentially subjected to KR desulfurization, converter smelting and LF furnace refining, and molten steel is obtained; the molten steel is subjected to continuous casting and rolling, and a steel coil is obtained; by controlling the chemical components of the low-carbon, low-phosphorus, low-aluminum, high-nitrogen and ultralow-sulfur steel, the stability of the components in the steel grade is realized, and the toughness and plasticity of the steel are improved; and by controlling the processes of KR desulfurization, converter smelting and LF furnace refining, the cleanliness of the molten steel is improved, and the stability of the content of each component is maintained.