36results about How to "Improve as-cast structure" patented technology

The invention discloses a high-strength and high-conductivity CuAg alloy material with a continuous fiber tissue and a preparation method thereof. The material consists of Cu, Ag, etc. Cu and Ag alloyingot with a columnar structure is obtained by a directional solidification technology, and continuous fibrous tissue structure is obtained by the technologies of extruding, drawing, etc. The components of the alloy material are as follows: 5-10wt% of Ag and balance of Cu. The preparation method of the CuAg alloy comprises the following steps: (1) preparing chemical composition; (2) vacuumizing asmelting room and a directional solidification room; (3) smelting the alloy; (4) directionally solidifying; (5) hot extruding; (6) hot processing; and (7) drawing wire or rolling. The material is applicable to slide contact material such as a middle-load and low-load switch, a breaker, a contactor, a micromotor slip ring, a commutating sheet, and the like, high-pulse magnetic field conductor material, an integrated circuit lead wire frame, a fish torpedo lead wire, an electric conduction reed, etc.

The invention discloses an abrasion-proof and corrosion-resistant nickel-based alloy wire and a preparation method thereof. The alloy wire comprises the following components: 17-21% of C, 20-25% of Co, 1.8-2.2% of W, 6.4-9.5% of Mo, 1.4-1.8% of Al, 3.2-4.5% of Ti, 0.1-0.5% of Nb, 0.1-0.5% of Hf, 1.2-1.8% of Ta, 0.03-0.06% of Re, 0.01-0.05% of Ce, 0.02-0.1% of C, 0.005-0.015% of B, 0.02-0.07% of Zr, 0.005-0.008% of Mg, and the balance Ni. The preparation technology of the alloy comprises the steps of vacuum smelting, remelting, forging, hot rolling, drawing, solid solution treatment and aging treatment, namely, raw materials are prepared and smelted based on mass percent and then smelted; the smelted materials are forged and rolled into obtain alloyed wire rods; the alloyed wire rods are drawn at a plurality of times to obtain phi 0.05-0.4mm alloy wires; finally the alloy wires are subjected to solid solution treatment and aging treatment. The abrasion-proof and corrosion-resistant nickel-based alloy wire can be used as a brush wire material for brush sealing of an aircraft engine, a gas turbine, etc., thus the brush sealing effect can be effectively improved, and the service life can be prolonged.

The invention relates to a super advanced double-phase stainless steel smelting process method of a CD3MWN material. According to the invention, internal control components during double-phase stainless steel smelting is designed, wherein C is less than or equal to 0.030 wt%, Si is less than or equal to 0.90 wt%, Mn is 1.20-2.50 wt%, P is less than or equal to 0.020 wt%, S is less than or equal to0.015 wt%, and Cr is 26.2-27.5 wt%, Ni is 6.2-7.6 wt%, Mo is 2.2-3.4 wt%, Cu is less than or equal to 0.80 wt%, W is less than or equal to 0.80 wt%, N is 0.32-0.38 wt%, B is 0.0010-0.0100 wt%, Ba is0.0002-0.0100 wt%, and Ce+La is 0.005- 0.030 wt%; and %Cr+3.3 (%Mo+0.5%W)+16%N is less than or equal to 45, the content of trace elements B, Ba, Ce, and La can be precisely controlled; the N content is increased to 0.30% or more, and at the same time, nitrogen holes in the casting can be avoided; and the content of harmful elements such as sulfur, oxygen, hydrogen and the like is minimized to improve the purity of the molten steel. The cast casting has high strength and excellent corrosion resistance. In the stainless steel, a ferrite phase and an austenite phase are close to 50%, the castinglife is prolonged. the production costs are greatly reduced, and purposes of energy saving and environmental protection can be realized.

The invention discloses a method for forging a mold cavity (concavity) module. By means of hot machining, multi-heating-number and multi-direction forging is adopted, rolling reduction of different heating numbers and in different directions is controlled, and internal structures are improved. According to the mold cavity (concavity) forged through forging tools such as a wide anvil, a narrow anvil, a marking knife and a big platform, it is guaranteed that the dimension and appearance are qualified. Normalizing and tempering are adopted in heat treatment, so that structure hardness is uniform. Compared with the prior art, the method has the advantages that 1, the smelting steel tapping temperature is controlled, big ingot as-cast structures are improved, and composition segregation is reduced; 2, by means of the multi-heating-number and multi-direction forging mode, the mechanical properties of the large-cross-section module can meet standard requirements; 3, according to the mold cavity (concavity) forged through the forging tools such as the wide anvil, the narrow anvil, the marking knife and the big platform, the defect that billet iron smelting is nonuniform is overcome, and dimension and appearance requirements are met; and 4, the mold cavity (concavity) module which approximates to a mold in appearance is forged, machining procedures during mechanical mold machining can be simplified, time is saved, and waste of metal materials is reduced.

The invention provides a low-density high-strength magnesium-lithium alloy and a preparation method thereof. The components and mass percentages of the magnesium-lithium alloy are: 11-15% Li, 0.5-4% Al, 0.05-0.5% Zr, 0.2~1.2%La, 0.1~0.6%Ce, the total amount of impurity elements Fe, Ni, Cu, Si≤0.2%, and the balance is Mg. The preparation method of the magnesium-lithium alloy involved in the present invention includes vacuum induction melting and plastic deformation treatment. The magnesium-lithium alloy processed by means of alloying, crystal grain refinement and deformation treatment in the present invention has high strength and plasticity under the premise of ensuring low density, and at the same time has excellent machining performance.

The invention provides a square bloom continuous casting manufacturing method facilitating elimination of core defects and belongs to the field of large-section square bloom production. According to the square bloom continuous casting manufacturing method, the continuous casting blank soft reduction technology and the hot core high-temperature heavy reduction rolling technology are optimized and combined. The core macrosegregation defects are eliminated in the soft reduction process; heavy-reduction rolling mills are directly arranged behind a continuous casting straightening and withdrawing machine, the online opposite reduction rolling process is implemented by making full use of cold outside and hot inside temperature field features of a casting blank under the complete solidification state of the casting blank to eliminate the defects such as core shrinkage cavity porosity.

The invention discloses a process for producing die steel by utilizing a converter continuous casting mode. The process comprises a steel making continuous casting process and a steel rolling process. The steel making continuous casting process comprises the following process steps of: converter smelting, LF (Ladle Furnace) refining, continuous casting, slow cooling and other process steps; and the steel rolling process comprises the following process steps of: heating, scale removal by using high pressure water, rolling, straightening, stacking, slow cooling and other steps. By using the die steel produced by the invention, the contents of gas and occluded foreign substances in the die steel can be reduced, the thermal stress and the structural stress for slowing a steel blank down are eliminated, a thick and nonuniform cast structure inside the steel blank is improved, and the problems of flaw detection disqualification and finished product crack of the die steel are solved. By using the process, the aim of producing the die steel by using a converter is achieved, the production cost is reduced, and the economic benefit is increased.

The invention provides an aluminum-scandium alloy target blank and a preparation method and application thereof, and relates to the technical field of aluminum-scandium alloys. The preparation methodof the aluminum-scandium alloy target blank comprises the following steps that an aluminum source and a scandium source are placed in a water cooling copper crucible, the water cooling copper crucibleis filled with inert gas after being vacuumized, electric arc melting is carried out repeatedly, and molten alloy liquid is obtained; the molten alloy liquid is condensed under inert gas shielding, and an aluminum-scandium alloy ingot is obtained; and the aluminum-scandium alloy ingot is sequentially subjected to electromagnetic stirring and repeated thermal mechanical treatment, and the aluminum-scandium alloy target blank is obtained. According to the aluminum-scandium alloy target blank and the preparation method and application thereof, electric arc melting is carried out under a vacuum and inert atmosphere, and the oxygen content in an aluminum-scandium alloy is reduced; by means of repeated electric arc melting, electromagnetic stirring and repeated thermal machining, the structureof the as-cast aluminum-scandium alloy is improved, and the defects of the as-cast aluminum-scandium alloy are repaired; the utilized water cooling copper crucible is high in cooling speed, segregation of scandium in the aluminum-scandium alloy is reduced, and the target blank is even in crystal particle, free of segregation, even in microstructure, high in density and good in film-forming property.

The invention provides an aluminum-scandium alloy target material, a preparation method and application thereof and a vacuum consumable electro-arc furnace, and relates to the technical field of target material preparation. The preparation method of the aluminum-scandium alloy target material comprises the following steps: after an aluminum source and a scandium source are mixed, a mixture is subjected to pressing and assembly welding, and an obtained assembly welding electrode is subjected to vacuum arc melting twice in a water-cooling copper crucible; and then repeated thermomechanical processing, machining and binding are carried out, the aluminum-scandium alloy target material is obtained, and the water-cooling copper crucible is provided with a water jacket and an arc-stabilizing coil. According to the aluminum-scandium alloy target material, the vacuum arc melting is carried out in the water-cooling copper crucible twice, pollution to scandium due to adoption of a refractory material in a traditional smelting furnace is avoided, the cleanliness is high, and the oxygen content is low; due to rapid cooling and subsequent thermomechanical processing in the water-cooling copper crucible, the structure of the aluminum-scandium alloy target material is improved, defects are overcome, the obtained aluminum-scandium alloy target material has a uniform microstructure and uniform average grain size and has no obvious defect of pores and segregation, and the density and the finished product rate of the aluminum-scandium alloy target material are high.

The invention discloses a heat-resistant alloy resisting sulfur corrosion. The heat-resistant alloy is prepared from the following components in percentage by weight: 0.025-0.25 percent of C, 1.30-2.50 percent of Si, 1.00-2.50 percent of Mn, 20-30 percent of Cr, 17-27 percent of Ni, 0.75-2.50 percent of Nb, 0.6-1.50 percent of Mo, 1.0-2.5 percent of Al, 0.6-1.5 percent of V, 0.001-0.050 percent of Ce+La, at most 0.035 percent of P, at most 0.030 percent of S and the rest being Fe. The invention further discloses a rod production method of the heat-resistant alloy resisting sulfur corrosion. According to the heat-resistant alloy and the rod production method, the alloy rod has relativley high strength and good high-temperature sulfur corrosion resistance.

The invention discloses casting piece steel for railway vehicle swing bolster side frame and a preparation method thereof. The casting piece steel comprises the following chemical components in percentage by weight: 0.23%-0.29% of C, 0.30%-0.50% of Si, 0.80%-1.00% of Mn, not greater than 0.030% of P, not greater than 0.030% of S, not greater than 0.30% of Cu, 0.20%-0.50% of Ni, 0.30%-0.40% of Cr, 0.020%-0.050% of Al, not greater than 0.10% of rear earth, and the balance of Fe and inevitable impurities. The preparation method of the casting piece steel comprises the following steps: firstly, adding materials corresponding to C, P, S, Cu and Ni into an eccentric-bottom electric arc furnace, melting the materials into molten steel, and controlling the carbon content in the molten steel to not less than 0.50%; carrying out oxidation and decarbonization by using oxygen gas, discharging steel when the temperature of the molten steel is not less than 1630 DEG C, adding refining slag, lime, a deoxidizing agent, manganese-iron alloy, silicon-iron alloy and chromium-iron alloy into every ton of steel ladles while the steel is discharged to the steel ladles, and then, carrying out molten steel refining; after casting a casting piece, feeding the casting piece steel into a gathering-releasing chain type thermal treatment line for carrying out normalizing to obtain the casting piece steel for manufacturing the swing bolster side frame. The casting piece steel disclosed by the invention has the effects of purifying steel, improving a cast structure, reducing component segregation, carrying out microalloying in steel and deteriorating impurities.