63results about How to "Refining as-cast grain" patented technology

The invention discloses high-strength wrought magnesium alloy and a preparation method thereof and belongs to the technical field of light metal materials. The high-strength wrought magnesium alloy comprises the following components in percentage by weight: 2.0-6.5% of Zn, 0.1-3.0% of RE, 0.1-2.0% of Ca and the balance of Mg and inevitable impurities; the high-strength wrought magnesium alloy also can comprise grain refiners Mn and/or Zr. Zn is a main strengthening element in the alloy, and can improve the room temperature strength of magnesium alloy through solid solution strengthening and aging precipitation strengthening; Ca is used for promoting precipitation, refining grains and improving high-temperature strength of alloy; and a small amount of RE is used for restraining recrystallization, refining deformed alloy grains, regulating texture and improving plasticity of alloy. According to the invention, by replacing expensive rare earth elements with cheap common alloying elements, a strengthening effect similar to that of rare earth is generated, the rare earth content is completely replaced or lowered and the cost of alloy is reduced while strength is guaranteed.

The invention discloses a high-strength corrosion-resistant aluminum alloy profile and a preparation method thereof. The aluminum alloy profile comprises an aluminum alloy base body and a ceramic coating. The aluminum alloy base body is prepared from Cu, Si, Fe, Cr, Mg, Mn, Zn, Ti, Li, Ni, Zr, Y, W, V and the balance Al. The ceramic coating is prepared from SiC, Cr2O3, NiO, Cr3C2, Al2O3 and Si3N4. According to the high-strength corrosion-resistant aluminum alloy profile, ceramic powder is arranged on the surface of the aluminum alloy base body through plasma cladding, and then laser remelting is conducted, so that the obtained aluminum alloy profile has good mechanical performance such as strength, hardness and impact toughness; and meanwhile, the high-strength corrosion-resistant aluminum alloy profile has the beneficial effects of being resistant to corrosion, good in abrasion resistance, long in service life and the like.

The invention discloses a thermo-mechanical treatment process of a great-length Cu-Cr-Zr-Si alloy contact line. The process includes: smelting Cu-Cr-Zr-Si alloy, with Cu accounting for 0.30% to 0.50%, Cr accounting for 0.10% to 0.15% and Zr accounting for 0.01% to 0.02% in content, with a combined protective layer composed of mixed inert gas and a covering dried charcoal protective layer, in an induction furnace; and performing drag casting with a horizontal continuous casting system with electromagnetic stirring and a local heater to obtain rods 16 to 120mm in length. By high-frequency inductive thermal rolling, step heating and water-cooling solidification, cold rolling, split ageing and finish drawing or cold rolling, the alloy contact line having symmetrical grooves in two sides, 110 mm<2> to 150 mm<2> in sectional area and 1800 to 2000 m in singular length. The process has the advantages that metallurgical quality of products is high, and the performances meet the needs of various overhead line systems for modern high-speed railways and low-speed heavy duties.

The invention discloses aluminum alloy for an anti-chloridion-corrosion type aluminum alloy oil pipe and a pipe manufacturing method of the aluminum alloy. The aluminum alloy comprises, by weight, 6.90%-7.49% of Zn, 2.10%-2.30% of Mg, 0.05%-0.10% of Cu, 0.10%-0.30% of Mn, 0.10%-0.30% of Cr, 0.01%-0.02% of Ti, 0.15%-0.2% of Zr, 0.05%-0.1% of Sc, and the balance Al and inevitable impurities. The strength performance of the aluminum alloy is improved significantly through matching of the high-content Zn and the low-content Mg. The strength and the repeated loading resistance of the aluminum alloy are improved through the appropriate-content Mn and the appropriate-content Cr, and the good plasticity and toughness of the aluminum alloy are ensured. The micro-content Ti, the micro-content Zr and the micro-content Sc serve as supplement and improvement. The structure stability and the performance reliability of the aluminum alloy are ensured through grain refinement and precipitation strengthening. The aluminum alloy for the anti-chloridion-corrosion type aluminum alloy oil pipe is high in overall specific strength, good in corrosion resistance, low in cost, good in processability and high in qualified product ratio.

The invention discloses preparation and an ageing treatment process for a Al-Mg-Si-Er aluminum alloy plate material, belonging to the technical field of metal alloy. The preparation method comprises the following steps: preparing metal ingots by adopting a semi-continuous casting method; homogenizing the metal ingots; respectively performing hot rolling and cold rolling on a rolling mill of 310*480mm, wherein the heating temperature of the hot rolling is 450 DEG C; and preserving the temperature for 2 hours, wherein the final rolling thickness is about 2mm. One process condition is that: 1 to 50 hours of ageing heat treatment is performed at 180 DEG C after solution treatment; and the other process condition is that: 1 hour of regression heat treatment is performed at 220 DEG C based on 7 hours of ageing at 180 DEG C, and the alloy is re-aged for 1 to 24 hours at 150 DEG C after regression treatment. The alloy treated by the process has higher strength, the 230MPa using performance requirement of the alloy can be well fulfilled, and the corrosion resistance and plasticity of the alloy can be improved.

The invention discloses a high magnetic induction orientated high-silicon steel plate thin strip and a preparation method thereof. The thin strip comprises the following ingredients: less than or equal to 0.04% of C, 5.0-6.7% of Si, 0.05-0.2% of Mn, 0.015-0.04% of Als, less than or equal to 0.2% of Nb, less than or equal to 0.1% of V, less than or equal to 0.5% of Cu, 0.006-0.010% of N, 0.007-0.02% of S and the balance of Fe and impurities. The method comprises the following steps that: carrying out hot rolling on a plate blank obtained by casting, carrying out acid pickling on a hot rolling plate to remove an oxidization layer, and then, carrying out warm rolling; then, carrying out decarburizing annealing on a cold rolling thin plate; carrying out nitridation processing, and coating thesurface of the steel strip with separant, and carrying out secondary recrystallization annealing and purification annealing; and finally, carrying out flattening stretching annealing. By use of the thin strip, the heating temperature of the plate blank is lowered, inhibitor behaviors and recrystallization tissues are regulated and controlled, so that the harmonious collocation of an inhibition force-tissue-texture in a secondary recrystallization process is realized, the high magnetic induction orientated high-silicon steel plate thin strip with sharp Goss ([110](001)) texture characteristicscan be produced on a large scale, production cost is greatly lowered, and the thin strip has a wide application prospect.

The invention discloses a Gd-Lu-containing aluminum alloy section bar for space flight and aviation and a preparation method thereof. The Gd-Lu-containing aluminum alloy section bar comprises, by weight, 5.2-6.4% of Zn, 1.8-2.6% of Mg, 1.5-2.0% of Cu, 0.3-0.6% of Mn, 0.25-0.35% of Cr, 0.1-0.3% of Si, 0.15-0.25% of Fe, 0.05-0.1% of Ti, 0.04-0.08% of Zr, 0.2-0.4% of Gd, 0.1-0.2% of Lu and the balance Al. Gd and Lu rare earth elements are added into an Al-Zn-Mg-Cu series aluminum alloy and through alloying, alloy as-cast grains are refined, strengthening phase precipitation density is improved, strengthening phase distribution is uniform, recrystallization is inhibited, crystal boundary movement is prevented, re-crystal grain growth is inhibited, alloy strength is substantially improved and stress corrosion resistance and welding performances of the alloy are improved. Gd and Lu replace Sc and are added in the Al-Zn-Mg-Cu series aluminum alloy so that a production cost is not greatly improved and alloy strength is greatly improved. The Gd-Lu-containing aluminum alloy section bar can be widely used in the field of space flight and aviation.

The invention discloses a high-strength corrosion-resistant aluminum alloy section bar for doors and windows. The high-strength corrosion-resistant aluminum alloy section bar consists of the following components in percentage by weight: 1.2-1.8% of Mg, 1-1.5% of Cu, 0.3-0.5% of Mn, 5-8% of Zn, 0.02-0.2% of Sc, 0.02-0.1% of Ti, 0.01-0.1% of Cr, 0.05-0.25% of Fe and 0.05-0.3% of Yb. The high-strength corrosion-resistant aluminum alloy section bar is prepared by the following process: smelting raw materials and putting the smelted raw materials on an extruder to extrude at an extrusion speed of 5-40m/min; after extrusion is ended, cooling the raw materials to a temperature lower than 50 DEG C to carry out stretching and straightening, thereby obtaining an extruded part; putting the extruded part into a heat preserving furnace to carry out thermal treatment, carrying out degreasing, chromizing, washing and drying on the extruded part after a washing process, and then carrying out powder spraying on the extruded part to obtain the high-strength corrosion-resistant aluminum alloy section bar. The high-strength corrosion-resistant aluminum alloy section bar for doors and windows disclosed by the invention is high in strength, and is good in corrosion resistance; and doors and windows manufactured by the high-strength corrosion-resistant aluminum alloy section bar are not liable to deformation and color change, and are long in service lifetime.

The invention discloses an automobile corrosion-resistant die-casting aluminum alloy and a preparation method thereof, and belongs to the field of aluminum alloy die-casting processing. The automobilecorrosion-resistant die-casting aluminum alloy comprises, by weight, 6.5%-7.6% of Si, 1.4%-2.1% of Mg, 0.8%-1.3% of Cu, 0.05%-0.11% of Sr, 0.4%-0.9%of Zn, 0.4%-0.8% of Mn, 0.2%-0.6% of Fe, 0.2%-0.5%of Y, 0.03%-0.05% of Er, less than or equal to 0.5% of other metals and non-metals, and the balance Al. The automobile corrosion-resistant die-casting aluminum alloy is prepared by the steps of melting, refining, standing, die casting, solid solution quenching treatment, aging treatment and the like. The aluminum alloy has the advantages that the corrosion resistance is greatly improved, the tensile property at high temperature is good, the toughness is high, and the extrusion resistance is good; and the preparation method is simple and feasible in process, and has the advantages of being highin safety and low in production process cost, and the produced aluminum alloy casting meets the use requirements of the workpiece needing to bear a large dynamic load.

The invention discloses an aluminum alloy sodium-free refining agent containing rare earth. The aluminum alloy sodium-free refining agent comprises, by weight, 50-60 parts of KCl, 30-35 parts of K2CO3, 10-15 parts of LiCl, 30-35 parts of AlF3, 10-12 parts of potassium fluoroaluminate, 5-10 parts of CaF2, 5-10 parts of carbon powder, 15-25 parts of light calcium carbonate, 2-8 parts of CaO, 2-5 parts of fluorite and 5-10 parts of rare earth. By means of the refining agent, no impurity sodium is introduced into the aluminum alloy refining process, rare earth metal is added, and therefore the mechanical performance of alloy can be effectively improved.

The invention relates to the field of manufacturing of large-section thick large blanks, in particular to a pressure casting method of a purified homogenized compacted fine-grained large steel blank. According to the method for improving quality of a large steel blank by pressure effect, the problems that the existing large-section blank experiences gross segregation, shrinkage cavity and porosity, inclusion and grain coarseness can be solved; the large steel blank can be purified, homogenized, compacted and fine grained during manufacturing; yield of the blank is significantly improved; on such basis, gravity riser feeding is replaced with pressure feeding to allow non-riser casting, and yield of the blank can be significantly increased. The pressure casting method is applicable to manufacturing of large-section steel blanks, including round billets, square billets and flat billets, is applicable to manufacturing of large blanks of aluminum alloy, magnesium alloy and high-temperature alloy and is also applicable to manufacturing of complex castings of ferrous metals and nonferrous metals.

The invention discloses a welding wire matched with AI-Mg-Si series aluminum alloy during use. The welding wire is prepared from the following main chemical components in percentage by weight: 1.2-1.5 percent of Mg, 0.8-1.0 percent of Si, 0.2-0.3 percent of Cu, 0.4-0.5 percent of Fe, 0.1-0.15 percent of Cr, 0.15-0.2 percent of Ce, 0.1-0.2 percent of Er and the balance of Al. A preparation process of the welding wire comprises the following steps: mixing the raw materials in proportion, smelting by adopting a medium-frequency induction resistance furnace and casting under the protection of argon gas into a cast ingot; beheading and milling the homogenized cast ingot and then extruding to prepare an alloy wire rod; performing coarse, medium and fine wire drawing on the alloy wire rod and then performing scraping and cleaning treatment to obtain the welding wire. The welding wire prepared by the preparation process disclosed by the invention has the following advantages that a smelting process is stable and easy to realize, the drawing performance of the welding wire is good, and a drawing device is subjected to sealing treatment to prevent the surface oxidation of the welding wire; as rare earth elements are added, the welding wire structure is refined; impurities in the welding wire are less and low in content, so that the toughness of the welding wire is promoted to be improved; scraping and ultrasonic cleaning are adopted for surface treatment, so that the simplicity and no pollution are realized; the welding wire is low in burn rate, difficult to break and good in mechanical property.

The invention discloses an electroslag remelting slag system for duplex stainless steel. The electroslag remelting slag system is prepared from the following components in percent by weight: 50.0-65.0% of CaF2, 8.0-15.0% of Al2O3, 3.0-10.0% of CeO2, 15.0-20.0% of CaO, 3.0-5.0% of MgO, 1.0-3.0% of SiO2 and the balance impurities which are not more than 1%. According to the slag system, the slag viscosity changes gently as the temperature is reduced, and the high temperature plasticity and the strength of slag can be also improved, so that bleed-out and slag leakage are prevented. The conductivity of the slag can be reduced, the chemical stability of the slag can be improved, and the system has better deoxidizing and desulfurizing effects and inclusion absorption action, thereby playing a role of purifying molten steel deeply. As-cast grains can be refined, and the strength and the toughness of steel are improved. The electroslag remelting slag system is uniform to transfer heat and goodin lubricating effect, and the slag layer is kept stable and is melted uniformly.

The invention belongs to the technical field of magnesium alloy and particularly relates to magnesium alloy for a notebook computer. The magnesium alloy for the notebook computer comprises the following components according to atomic percent: 2-8% of Al, 0.1-2% of Zn, 0.1-0.6% of Mn, 0.2-1.5% of Ce, 0.2-1.5% of Nd, 5-10% of Ca, 0.1-2% of Bi and the balance of Mg; the magnesium alloy is also filled with graphite fiber accounting for 1-5wt% of the total mass of the magnesium alloy; the surface of the magnesium alloy is subjected to pickling and activating treatment, and a pickling solution is prepared from the following components in mass ratio according to a formula: 50-75% of Na3PO4.12H2O, 15-25% of H3PO4 and 8-25% of KMnO4; and the pickling and activating treatment lasts for 1-10 min. Compared with the prior art, the magnesium alloy is relatively high in mechanical property and corrosion resistance and relatively low in inflammability.

The invention relates to the technical field of metal materials and machining technology of the metal materials and discloses an ultrahigh-plasticity aluminum alloy and a preparing method thereof. Thealuminum alloy comprises, by weight percent, 0.8%-1.2% of Mg, 0.4%-0.8% of Si, 0.2%-0.4% of Fe, 0.2%-0.5% of Cu, and the balance Al. The preparing method of the aluminum alloy comprises several processes of burdening, smelting, casting, homogenizing treatment and extruding deformation treatment. When the aluminum alloy is prepared, the aluminum alloy composition components and the use amounts ofall the components are reasonably controlled, a wrought aluminum alloy microstructure with the structure still being of the single phase is obtained, and in addition, the structure is uniform; and dueto a solution strengthening effect of various elements, the phenomenon that elements are excessively added, a second phase is generated, and the subsequent extruding deformation treatment process ishindered is avoided, the problem of difficult aluminum alloy extruding is solved, grain growth in the extruding process is avoided, and the high-toughness aluminum alloy with the small and uniform alloy microstructure is obtained finally. The method is simple and easy to operate, low in requirement for equipment, low in cost and suitable for large-scale production.

The invention discloses a high-heat-dissipation air-ventilation tray type cable bridge, and relates to the technical field of cable bridges. The high-heat-dissipation air-ventilation tray type cable bridge comprises a bridge bottom plate and bridge side plates arranged on the two sides of the bridge bottom plate, wherein the bridge bottom plate is composed of a plate body I, a plate body II, a plate body III and a plate body IV in a spliced manner, wherein the plate body I comprises a side edge I and a side edge II which are opposite to each other; the plate body II comprises a side edge III and a side edge IV which are opposite to each other; the plate body III comprises a side edge V and a side edge VI which are opposite to each other; the plate body IV comprises a side edge VII and a side edge VIII which are opposite to each other; the side edge I is fixedly connected with the bridge side plate; the side edge II is hinged to the side edge III; the side edge IV is hinged to the sideedge V; the side edge VI is hinged to the side edge VII; the side edge VIII is fixedly connected with the other bridge side plate. The invention further discloses a preparation method of the high-heat-dissipation air-ventilation tray type cable bridge. The width of the bridge can be adjusted according to needs, the cables can be placed in a classified mode, and meanwhile, the bridge has high heatdissipation performance.