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 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 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.