12results about How to "Reduced hot cracking tendency" patented technology

The invention belongs to the technical field of semi-continuous casting devices, and relates to a large-size highly-alloyed magnesium-rare earth alloy round ingot semi-continuous casting device which comprises a crystallizer, a dummy ingot base and a flow dividing disc, a plurality of stages of arc bosses are arranged on the inner bottom face of the dummy ingot base, and the radiuses of the arc bosses are sequentially increased from top to bottom; the core part is used for promoting high-temperature melt to quickly flow to the edge part and reducing the temperature difference between the core part and the edge part; the flow dividing disc comprises a vertical pipe and a plurality of fan-shaped flow dividing areas, the flow dividing areas are arranged in the circumferential direction of the vertical pipe, and the high-temperature melt flows in from the vertical pipe, flows out of the flow dividing areas and enters the crystallizer, so that the radial flow of the high-temperature melt is more uniform. According to the invention, the uniformity of melt flow, the uniformity of temperature and the uniformity of solute and structure of the cast ingot are obviously improved, the hot cracking tendency is reduced, and the cracking problem in the casting process is reduced. The prepared large-size high-toughness magnesium alloy cast ingot is free of cracks, segregation, slag inclusion and other defects of the structure, and the percent of pass is larger than 98%.

The invention relates to the technical field of aluminum alloy materials, in particular to an aluminum alloy material, an aluminum alloy conductor wire core and a preparation method and application of the aluminum alloy conductor wire core. The aluminum alloy material comprises, by mass, 0.3%-1.0% of iron (Fe), 0.03%-0.2% of magnesium (Mg), 0.1%-0.8% of manganese (Mn), 0.08%-0.3% of zirconium (Zr), 0.004%-0.03% of boron (B), 0.015%-0.65% of rare earth (RE), 0-0.12% of silicon (Si) and the balance aluminum (Al) and inevitable impurities, the single impurity is not larger than 0.03%, and the sum of the impurities is not larger than 0.1%. Wherein the rare earth (RE) is prepared from the following components in percentage by mass: 0.003 to 0.1 percent of lanthanum (La), 0.004 to 0.15 percent of cerium (Ce) and 0.008 to 0.4 percent of scandium (Sc). The prepared aluminum alloy material has the characteristics of high conductivity, high strength, heat resistance, corrosion resistance and good fracture and impact toughness, is very suitable for being used as a cable conductor, and is particularly applied to places with high requirements on high temperature, vibration, movement, corrosion and the like, such as power cables, electrical connecting wires, drag chain cables applied to metal smelting places and the like.

The present invention provides an anodized aluminum alloy powder for laser additive manufacturing, which belongs to the technical field of aluminum alloys. The aluminum alloy powder includes the following components in mass percentage: Mg2‑5%, Mn0.2‑1.5%, Zr0.5‑1.5%, Cu0.05‑0.20%, Fe0.1‑0.2%, and the rest is Al. The aluminum alloy powder proposed by the present invention can be used for additive manufacturing, and can also be anodized. The surface oxide film of the obtained finished product is uniform and has good glossiness, which is beneficial to subsequent color plating. The hollow powder rate of the aluminum alloy powder provided by the present invention is low, which effectively reduces the probability of defects such as pores and cracks in the additive manufacturing metal parts, and improves the performance and life of the parts.

The invention relates to an aluminum alloy soldering lug and a preparation method and application thereof, and belongs to the technical field of welding. The aluminum alloy soldering lug disclosed by the invention is prepared from the following elements in percentage by mass: 3.0 percent to 4.5 percent of Si, 2.0 percent to 3.5 percent of Fe, 0.8 percent to 1.2 percent of Mg, 0.10 percent to 0.25 percent of Zr, 0.05 percent to 0.15 percent of Sc, 0.02 percent to 0.08 percent of Er, 0.05 percent to 0.12 percent of Ti, 0.005 percent to 0.02 percent of B and the balance of Al and other inevitable impurities. The mass ratio of (Zr + Sc) / Fe is 0.08 to 0.15; the mass ratio of Mg to Si is 0.25 to 0.35; the mass ratio of (Fe + Si) to (Zr + Sc + Er) is 20-25; the problems that laser welding aluminum alloy is thick in weld joint structure and uneven in performance, and a dissimilar material welding interface is embrittled are fundamentally solved.

The invention provides a low-segregation aluminum-tin alloy round cast ingot and a preparation method thereof, and belongs to the technical field of aluminum alloy casting forming. The low-segregation aluminum-tin alloy round cast ingot provided by the invention is prepared from the following components in percentage by mass: 5.5 to 7.0 percent of Sn, 0.7 to 1.3 percent of Cu, 0.7 to 1.3 percent of Ni, less than or equal to 0.15 percent of Fe, 0.15 to 0.25 percent of Si, 0.15 to 0.25 percent of Zr, 0.01 to 0.20 percent of Ti, 0.15 to 0.25 percent of Sb, 0.02 to 0.10 percent of P and the balance of Al. By using various elements such as zirconium, titanium, silicon, antimony and phosphorus, a synergistic effect can be achieved, and the uniformity of the tin content of the aluminum-tin alloy is remarkably improved. The result of the embodiment shows that even if the diameter of the low-segregation aluminum-tin alloy round cast ingot is larger than or equal to 250 mm, the low-segregation aluminum-tin alloy round cast ingot cannot crack in the casting process, and meanwhile element distribution uniformity is good.

This invention discloses a high-elongation cast Al-Cu-Zn-Mg alloy with good resistance to hot cracking. The alloy composition, by mass percentage, includes: Cu 3.5–4.5%, Mg 0.4–1.5%, Mn 0.2–0.5%, Ti 0.10–0.2%, Zn 2.5–3.5%, with the balance being Al and unavoidable impurity elements. Addressing the limitations of existing Al-Cu casting alloys, such as wide solidification temperature range, poor fluidity, and hot cracking, this invention provides a high-Zn-content Al-Cu-Zn-Mg alloy with good resistance to hot cracking. This alloy has a low melting point, a narrowed solidification temperature range, and excellent resistance to hot cracking and mechanical properties. It can be used for various high-strength cast aluminum alloy structural parts, effectively avoiding casting defects such as hot cracking, shrinkage cavities, and porosity, and significantly improving the overall mechanical properties of the alloy.

The invention discloses a heat-resistant cast aluminum alloy, and belongs to the technical field of high-performance aluminum alloys. The heat-resistant cast aluminum alloy is obtained by sequentially adopting melting, purifying, casting, solution treatment and aging treatment, and the heat-resistant cast aluminum alloy comprises the following elements in percentage by mass: 5-12% of Cu, 0.5-2.0% of Ca, less than or equal to 0.8% of RE, less than or equal to 0.3% of Mn, less than or equal to 0.5% of Ti and the balance of Al and inevitable impurities. RE is Ce, La, Sc or Er. According to the invention, reasonable compatibility of elements such as Cu, Ca and the like and a micro rare earth element regulation microstructure are adopted, so that an Al8Cu4Ca eutectic phase and an Al2Cu eutectic phase are mainly formed in the alloy, and excellent casting performance and high room-temperature and high-temperature mechanical properties of the alloy are ensured.

The invention belongs to the field of metal-based composite materials, and relates to a high-strength and high-conductivity copper-based composite material and a preparation method thereof. Comprising the following steps: taking out a part from an original copper base as a prefabricated copper base and smelting the prefabricated copper base; adding active elements into the prefabricated copper melt, and uniformly stirring and mixing; adding nano ceramic particles into the prefabricated copper alloy melt, and uniformly stirring and mixing; smelting the residual original copper base at a high temperature, adding the copper alloy reinforced melt into the residual base copper melt, and uniformly stirring and mixing; and cooling is carried out under mechanical vibration, part of active elements are separated out of the copper base and form a liquid phase enrichment layer on the surfaces of the nano ceramic particles, and finally solid solution coating is formed, so that interface energy and wettability of the copper base and the nano ceramic two phases are reduced, uniform distribution of the nano ceramic particles in the copper base is promoted, and the high-strength and high-conductivity copper-based composite material is obtained. By means of the preparation method, the preparation difficulty and the production cost can be reduced, and the obtained composite material can have the conductivity and the mechanical property at the same time.

The present invention discloses a melt processing device and method for preparing super-large aluminum alloy ingots. The device is mainly composed of an annular electromagnetic melt processor, a hot top, a crystallizer, a crystallizer water tank, a graphite ring, an ingot guide and a lifting mechanism; the annular electromagnetic melt processor is placed in the crystallizer, concentric with the crystallizer, and a line port and a connecting mechanism are arranged on its top, and it is connected to the lifting structure, and can be moved up and down in the height direction of the crystallizer through the lifting mechanism, and positioned at a corresponding position in the crystallizer; the lower end of the hot top is sealed and connected to the crystallizer through a graphite ring; the crystallizer water tank is arranged on the periphery of the crystallizer. The device is used for melt processing, and in the semi-continuous casting process, the annular electromagnetic melt processor is applied to the alloy melt to achieve effective uniformity of the temperature field and composition field of the super-large volume alloy melt, and to achieve effective control of the melt flow, so as to prepare high-quality super-large aluminum alloy ingots with uniform and fine structure and uniform composition.

The invention belongs to the technical field of alloy materials, and provides a nickel-based superalloy and powder, a TiC-doped nickel-based superalloy and powder as well as a preparation method and application of the TiC-doped nickel-based superalloy and powder. The nickel-based high-temperature alloy powder comprises, by mass, 8%-10% of Cr, 13%-17% of Co, 2%-5% of Al, 4%-5% of W, 4%-5% of Mo, 1%-2% of Ti, 6%-8% of Ta, 0.005%-0.1% of C, 0.005%-0.1% of B and the balance Ni. By reasonably controlling the content of elements in the nickel-based superalloy powder, the printing performance of the nickel-based superalloy powder is good, and cracks of the obtained nickel-based superalloy are small; furthermore, titanium carbide powder is doped in the nickel-based superalloy powder, the printing performance of the nickel-based superalloy powder can be further improved, and the obtained nickel-based superalloy doped with titanium carbide hardly has cracks and has excellent mechanical properties.

The invention discloses an alloy for preparing an anti-snakelike shock absorber seat of a train built-in bogie and a preparation method of the alloy, and belongs to the technical field of metal materials. The alloy comprises the following components in parts by weight: 5%-8% of Zn, 1.5%-3% of Mg, 2.0%-5% of Cu, 0.1%-0.5% of Zr, 0.04%-0.5% of Ti, 0.05%-0.5% of Y, 2.5%-4.5% of Si, 0.05%-0.5% of Co, 0.1%-0.5% of Nb and the balance of Al and inevitable impurities. Through cooperation of Zn, Mg, Cu, Si, Co, Nb and other components, the prepared alloy product has excellent tensile strength, yield strength and percentage elongation after fracture, and the mechanical property of the alloy is remarkably improved.

The present invention discloses a composition design method of a 6XXX series high-strength aluminum alloy welding filling material, comprising the following steps: determining the composition of the welding parent material; setting an ideal weld composition according to the parent material composition, the weld should have a fine and uniform equiaxed grain structure and the ability to quickly precipitate a strengthening phase through post-weld baking, ensuring that the weld and the heat-affected zone have excellent mechanical properties; using a filler material and a parent material of known composition for welding, and after determining the welding process, measuring the fusion ratio and the volatility of easily burnt elements; according to the parent material composition, the ideal weld composition, the fusion ratio and the volatility of easily burnt elements, the composition of the new welding filling material is calculated by the following formula: New welding filling material composition = ideal weld composition / (1-fusion ratio)*(1-volatility)-parent material composition*fusion ratio / (1-fusion ratio). The welding filling material designed by this method can improve the strength of the welded joint and meet the welding manufacturing requirements of high-end equipment.