74results about How to "Refining as-cast structure" patented technology

The invention provides a composite metamorphic cast aluminum alloy. The composite metamorphic cast aluminum alloy comprises, by weight, 8.0 % to 10.5 % of Si, 0.17 % to 0.3 % of Mg, 0.2 % to 0.5 % of Mn, 0.1 % to 1.0 % of Yb, 0.5 % to 3.0 % of sodium salt, less than 0.2 % of Fe, less than 0.1 % of Sn, less than 0.1 % of Cu and less than 0.05 % of Pb and the balance Al, wherein the Fe, the Sn, the Cu and the Pb are limited impurity elements. The invention further provides a preparation method and application of the composite metamorphic cast aluminum alloy. Due to metamorphism of the heavy rare earth element Yb and the alloying function, the casting-state structure of the alloy is significantly refined, strength and toughness of the alloy are improved, oxidation blending imported by the sodium salt metamorphism is reduced, and the compactness of a casting is improved.

A aluminum alloy material consists of Si 9.5-11.5wt%, Cu 2.0-3.0wt%, Mg 0.3-0.4wt%, mixed rare earth RE 0.1-0.3wt%, Mn is less than or equal to 0.5, Zn is less than or equal to 1.0, Fe is less than or equal to 1.0, Al residue. The mixed rare earth RE consists of La 5-80wt%, Ce 5-40wt%, Nd 1-20wt%, Y 1-20wt%, Pr 1-20wt%. It achieves good flowing, mechanical and cutting machining performance.

The invention discloses a near-alpha titanium alloy with high dynamic performance. The near-alpha titanium alloy is composed of, by mass percent, 5.0%-6.8% of Al, 1.5%-2.4% of Zr, 1.0%-1.9% of Mo, 1.5%-2.5% of V, 0.05%-0.30% of Fe, 0.05%-0.14% of O, and the balance Ti. The sum of the mass percents of the components is 100%. The invention further discloses a preparation method of the titanium alloy. The as-cast structure of a large cast ingot is refined and the microcosmic uniformity of cast ingot components is improved through a purification and high-homogeneity smelting method; and meanwhile, as the content of Al and the content of O are controlled, it is guaranteed that the WSTi6211F titanium alloy has enough strength, the plasticity and the toughness of the WSTi6211F titanium alloy are greatly improved, and the purpose of improving the dynamic performance of the titanium alloy is achieved in combination with a high-temperature homogenizing treatment and cyclic forging process.

The invention discloses environmental self-lubricating wear-resistant copper alloy, comprising the following components by mass percent: 5-13% of Sn, 2-9% of Ni and/or Co, 2-11% of Bi, 0.05-0.3% of Zr, 0.05-0.5% of RE, the balance of Cu and inevitable impurities, wherein the content of the impurity is smaller than or equal to 0.3%, the RE is Ce-La misch metal. Meanwhile, the preparation method of the environmental self-lubricating wear-resistant copper alloy is disclosed. The environmental self-lubricating wear-resistant copper alloy has the advantages that the conventional wear-resistant copper alloy containing lead is replaced, and the environmental self-lubricating wear-resistant copper alloy is the wear-resistant copper alloy material with environment-friendly and self-lubricating effects. The alloy solidification molding process is interfered by adopting a strong pulsed electromagnetic physical field in the manufacturing process, the as-cast segregation and loosening of the obtained environmental self-lubricating wear-resistant copper alloy are significantly reduced, the alloy is fine and even in as-cast structure, and high in density, the hardness of the molded casting is greater than 70HB, the tensile strength is greater than 230MPa, and the alloy density is greater than 8.7g/cm<3>. The environmental self-lubricating wear-resistant copper alloy has good overall performance, the preparation method is good in stability, and low in cost, the preparation process is green and free of pollution, and industrialization is easily achieved.

The invention provides a preparation method of a TC17 titanium alloy flat square section bar. The preparation method comprises the following steps that (1) a riser and an ingot bottom of a TC17 titanium alloy cast ingot are cut off, and surface defects are removed; (2) billet forging is performed on the TC17 titanium alloy cast ingot, and primary forging stocks are obtained; (3) first middle forging is performed on the primary forging stocks, and first middle forging stocks are obtained; (4) second middle forging is performed on the first middle forging stocks, and second middle forging stocks are obtained; (5) sawing is performed on the second middle forging stocks, then forming forging is performed, and a semi-finished flat square section bar is obtained; and (6) heat treatment is performed on the semi-finished flat square section bar, and the TC17 titanium alloy flat square section bar with the length of 850 mm to 1600 mm, the width of 132 mm and the thickness of 65 mm to 100 mm is obtained. The preparation method has the advantages of integral technical scheme, strong process controllability, uniformity in product texture and shape, excellent overall performance, high batch stability and high yield and is suitable for large-scale industrial production.

The invention belongs to the technical field of metal materials and relates to a high-strength Mg-Li-Al-Y-Ca alloy and a preparation method thereof. The alloy is prepared from components in percentage by weight as follows: 4wt%-12wt% of Li, 2wt%-6wt% of Al, 1wt%-3wt% of Y, 0.5wt%-1.5wt% of Ca and the balance of Mg and impurity elements including Si, Fe, Cu and Ni, and the total quantity of the impurity elements is smaller than 0.02wt%. The alloy is prepared with the method comprising steps as follows: (1) material baking, (2) material addition, (3) casting, (4) plastic deformation, and (5) heat treatment technology. Certain mass of Y elements and certain mass of Ca elements are added to a Mg-Li-Al alloy, a strengthening phase having the high heat stability is introduced into an alloy solidification structure; meanwhile, the solidification structure is promoted to be refined; and the high-strength Mg-Li-Al-Y-Ca alloy has the relatively low density and the excellent mechanical property through plastic deformation and the heat treatment technology.

The invention relates to low alloy wearing resistance corrosion resistance steel which is suitably used in the ocean mud-sand wearing and corrosive environment, which is produced by the following steps: Mn-Si-Cr-Mo system non-carbide bainite alloy steel is taken as research basis, the carbon content and other alloy element contents are properly adjusted, elements of Al, Nb and rare earth contributing to improving the corrosion resistance of the alloy steel are added for modification, and the Mn-Si-Cr-Mo-Al system non-carbide bainite steel is formed by the progression quenching heat treatment process, so that the low alloy wearing resistance corrosion resistance steel is obtained. The steel has good obdurability, wearing resistant and corrosion resistant comprehensive performance and welding repair performances, and can be used to solve the problem of repairing worn blades of a centrifugal pump of a ship, and can also be applied to other ocean wearing resistance welding parts.

The invention provides a magnesium-zinc-zirconium-yttrium-magnesium alloy which comprises the following components in percentage by weight: 2.0-4.0% of zinc, 0.2-0.5% of zirconium and 0.9-5.8% of yttrium and the balance magnesium and impurity. The invention improves optional heat deflection temperature range of the alloy by controlling zinc content in the magnesium-zinc-zirconium series magnesium alloy and adding yttrium element with a proper proportion; higher deflection temperature is favorable for improving the heat deflection plasticity of magnesium alloy and improving extrusion rate; and meanwhile, alloy crystalline grain is refined by the action that high melting point second phase containing yttrium prevents crystalline grains from growing in the heat extrusion deformation recrystallization process so as to obtain magnesium alloy with moderate strength and favorable plasticity. The magnesium-zinc-zirconium-yttrium-magnesium alloy with the optimal proportion has the room-temperature tensile strength of 279 MPa, yield strength of 184 MPa and elongation percentage of 28%.

The invention provides a technological method for improving the equiaxed crystal ratio of bistable ferrite stainless steel continuous casting billets. The technological method comprises the steps of aprimary melting furnace, AOD, VOD, LF and continuous casting. According to the technological method provided by the invention, the equiaxed crystal ratio of the bistable ferrite stainless steel continuous casting billets is improved largely, and the cold machining and molding performances of ferrite stainless steel as well as the surface quality of products are improved; and the problems of nozzle clogging and blockage caused by TiN and TiOx generated by adding excessive Ti in the continuous casting technological process are solved effectively.

The invention relates to a method for improving the plasticity of cast Al-Li alloy. The method includes the steps that alloying elements capable of forming Al3M particles of the L12-type structure with Al are added in the casting process of the cast Al-Li alloy; and the alloying elements include at least two of Zr, Sc, Er and Yb. Through combined addition of the alloying elements capable of forming the Al3M particles of the L12-type structure with the Al in the cast Al-Li alloy, the alloy as-cast structure can be refined obviously, the alloy can be promoted to separate out coherency Al3M particles in the solid solution process, the precipitation density of composite particles Al3(M and Li) in the cast Al-Li alloy is increased ultimately, and thus alloy plasticity is improved. By adoption of the method, the cast Al-Li alloy can be further subjected to short-time 'preageing' treatment at a low temperature before solid solution, the number of the Al3M particles in an alloy matrix can be further increased, and the alloy plasticity is improved.

The invention discloses a low-cost titanium alloy and a preparation method thereof. In the titanium alloy, titanium is used as a main body element, and an alpha stable element B and a beta stable element Fe are used as alloy elements. The titanium alloy is composed of 0.5-5 wt.% of Fe, 0.05-0.2 wt.% of B, and the balance of titanium and inevitable impurities. The preparation method comprises the following steps: adding raw materials into an argon-introduced cold crucible levitation melting furnace according to the designed alloy component proportion, repeatedly melting to obtain a cast ingot, carrying out cogging forging on the cast ingot at the temperature of higher than the phase transformation point, sampling the forged alloy, carrying out heat treatment, and finally, carrying out structure and performance characterization. The titanium alloy provided by the invention has the advantages of uniform alloy components, fine structure, high tensile strength (up to 750-850 MPa), high elongation percentage (10-15%) and low cost, and can substitute partial high-price titanium alloys in some fields.

The invention discloses a component design and preparation method for a zinc-aluminum alloy pipe. The zinc-aluminum alloy pipe comprises, by weight, 36.00%-69.00% of zinc, 31.00%-64.00% of aluminum, 0.01%-1.00% of copper, 0.01%-1.00% of magnesium, 0.01%-1.0% of tin, 0.01%-1.00% of silver, 0.01%-2.00% of titanium, 0.01%-0.50% of boron, 0.01%-0.70% of cerium and 0.01%-0.20% of praseodymium, and the sum of the weight percentage is 100%. The obtained zinc-aluminum alloy pipe can be used for manufacturing a mold and a pipe fitting in a complex shape and used for manufacturing a delay element in the civil explosive industry according to the component and performance differences, so that an existing lead-antimony alloy pipe which is severe in environmental pollution and toxicity is replaced; and meanwhile, zinc-aluminum alloy is light in proportion and cheaper than a copper alloy material, the cost can be obviously reduced, and the zinc-aluminum alloy pipe can be widely used in metallurgy, mines, light industry, food, chemical industry, printing, mechanical equipment and other fields.

The invention discloses grain-refined manganese-lithium alloy and a method for manufacturing the same. The manganese-lithium alloy comprises, by mass, from 11.0% to 15.0% of Li, form 1.0% to 3.0% of Al, from 0.1% to 0.5% of La, lower than or equal to 0.3% of impurities and the balance manganese. The method for manufacturing the grain-refined manganese-lithium alloy includes heating a formula amount of the pure manganese, a formula amount of the pure lithium, a formula amount of the pure aluminum and a formula amount of manganese-lanthanum master alloy under conditions of vacuumizing and feeding of inert gas until the temperature reaches 720 DEG C to obtain alloy; preserving heat at the temperature of 700 DEG C after the alloy is completely melted, and allowing the alloy to stand for 15 minutes; and pouring melted alloy liquid in molds to obtain as-cast manganese-lithium alloy. The grain-refine manganese-lithium alloy contains rare earth La, structures of grains of the grain-refine manganese-lithium alloy are fine and uniform, the strength and the plasticity are improved, and the grain-refine manganese-lithium alloy is excellent in follow-up processing property, low in production cost and suitable for industrial large-scale production.

The invention relates to a 2XXX series aluminum alloy and a preparation method thereof, and belongs to the technical field of non-ferrous metal alloys. The problems of low strength and poor toughness of the 2XXX series aluminum alloy in the prior art are solved. The 2XXX series aluminum alloy comprises the following chemical components in percentage by mass: 3.9-4.5 percent of Cu, 0.5-1.0 percent of Mg, 0.5-1.2 percent of Mn, 0.3-0.8 percent of Si, 0.1-0.2 percent of Zr, less than or equal to 0.1 percent of Ti, less than or equal to 0.4 percent of Fe, less than or equal to 0.1 percent of Zn, less than or equal to 0.05 percent of single impurity, less than or equal to 0.15 percent of total impurity and the balance of Al. The preparation method of the 2XXX series aluminum alloy comprises the steps that 1, pure Al, an Al-Cu intermediate alloy, an Al-Mg intermediate alloy, an Al-Si intermediate alloy, an Al-Mn intermediate alloy and an Al-Zr intermediate alloy are weighed according to the mass percent of all the elements to serve as raw materials; 2, the raw materials are refined to obtain an aluminum alloy smelting solution, and cast into a cast ingot; and 3, the cast ingot is sequentially subjected to homogenization, forging and pressing, solution treatment and aging treatment, and the 2XXX series aluminum alloy is obtained. The strength and toughness of the 2XXX series aluminum alloy are improved.

The invention provides hot-rolled round steel for a high-carbon-manganese-chromium grinding ball. The hot-rolled round steel is prepared from the following components: 0.72 to 0.82 percent of C, 0.17to 0.35 percent of Si, 0.70 to 0.90 percent of Mn, 0.010 to 0.030 percent of P, 0.010 to 0.030 percent of S, 0.50 to 0.70 percent of C, 0.20 to 0.30 percent of In, 0.10 to 0.20 percent of Ag, 0.15 to0.25 percent of Cu, 0.080 to 0.100 percent of Ga, 0.20 to 0.26 percent of Ni, 0.10 to 0.14 percent of Zn, 0.14 to 0.16 percent of Sn and the balance of Fe and unavoidable impurities. The round steel provided by the invention contains relatively high elements including carbon, manganese, tin and the like and can be obtained by refining a casting-state structure of steel, so that the prepared grinding ball has relatively great rigidity; when an object with relatively great rigidity is ground, good wear resistance can be ensured; meanwhile, the round steel also contains the chromium element withrelatively high content, so that the round steel has a relatively strong corrosion-resisting capability and the round steel is suitable for being used in various fields for grinding.

The invention relates to wear-resistant steel and belongs to the technical field of metal smelting. The wear-resistant steel is prepared from the following components in percent by mass: 0.88-0.94% ofC, 0.20-0.30% of Si, 0.90-1.00% of Mn, 0.50-0.60% of Cr, 0.20-0.60% of W, 0.10-0.25% of V, 2.50-3.00% of Zr, 0.010-0.050% of Ti, 0.020-0.050% of Y, less than or equal to 0.025% of P, less than or equal to 0.025% of S, less than or equal to 0.25% of Cu and the balance of Fe and inevitable impurities. The wear-resistant steel has the beneficial effects that the problems of low strength and poor wear resistance of the existing low-carbon wear-resistant steel is solved; the wear-resistant steel is finer in crystal and fuller in internal density, and a grinding ball prepared by the wear-resistantsteel is larger in hardness and good in wear resistance.

The invention discloses a preparation method of Al-Zn-Mg-SC series aluminum alloy powder for metal 3D printing. The preparation method comprises the steps of batching, vacuum melting, casting, homogenization treatment, ingot surface post-treatment and pulverizing. The invention also discloses the aluminum alloy powder prepared by the method. The aluminum alloy powder is used for 3D printing of a workpiece, and the tensile strength of the prepared workpiece is 500-550 MPa, the yield strength is 450-505 MPa, and the elongation is 9%-12%. The metal 3D printing aluminum alloy powder meeting high-strength part printing requirements is prepared, the chemical components are uniform, and the grain sizes basically range within 40-60 micrometers.

The invention provides steel special for an abrasion-resistant grinding ball. The steel special for the abrasion-resistant grinding ball comprises 0.88%-0.94% of C, 0.20%-0.30% of Si, 0.90%-1.00% of Mn, no more than 0.025% of P, no more than 0.025% of S, 0.50%-0.60% of Cr, 0.010%-0.050% of Ti, 0.20%-0.30% of In, no more than 0.25% of Cu, 0.080%-0.100% of Ga, 0.20%-0.26% of Ce, 0.10%-0.14% of Zn, 0.14%-0.16% of Sn, and the balance Fe and inevitable impurities. By adoption of the technical scheme, crystals of the steel are fine, and the internal density of the steel is high; the grinding ball prepared from the steel is high in hardness and good in abrasion resistance; and the steel special for the abrasion-resistant grinding ball is low in production cost and suitable for being used for grinding in various fields.