448results about How to "Improve tissue uniformity" patented technology

The invention discloses an economical non-quenched and non-tempered micro-alloyed plastic die steel plate and a making method thereof. The economical non-quenched and non-tempered micro-alloyed plastic die steel plate comprises 0.32-0.40wt% of C, 0.20-0.50wt% of Si, 1.00-1.50wt% of Mn, 1.20-1.70wt% of Cr, 0.20wt% or less of Mo, 0.0025wt% or less of B, 0.03wt% or less of Ti, 0.03wt% or less of Nb, and the balance Fe. The making method comprises the following steps: carrying out converter smelting, LF+RH refining and continuous slab casting; heating the obtained slab at 1200-1230DEG C, carrying out precision rolling at 900-950DEG C, and carrying out finishing rolling at 870-920DEG C; carrying out controlled cooling after the steel plate rolling; and tempering the steel plate obtained after the controlled rolling and controlled cooling at 550-600DEG C to obtain the finished pre-hardened plastic die steel plate having a bainite structure. The yield strength, the normal temperature impact toughness and the cross section hardness of the steel plate are above 800MPa, above 20J and 310-350HB respectively. The making method is suitable for the production of pre-hardened plastic die steel plates with the specification of below 120mm from 320mm continuous casting blanks.

The invention provides a preparation method of a TC4ELI titanium alloy bar. The preparation method comprises the following steps of: (1) carrying out cogging forging; (2) carrying out upsetting forging; (3) carrying out precise forging; (4) carrying out shearing, straightening and annealing treatment in sequence, thereby obtaining the cylindrical TC4ELI titanium alloy bar with the cross-section diameter of 15mm-90mm. The invention also provides a preparation method of the TC4ELI titanium alloy bar. The preparation method comprises the following steps of: (1) carrying out cogging forging; (2) carrying out upsetting forging; (3) carrying out precise forging; (4) rolling; (5) carrying out shearing, straightening and annealing treatment in sequence, thereby obtaining the cylindrical TC4ELI titanium alloy bar with the cross-section diameter of 8mm-15mm. The preparation method is simple in process, strong in repeatability and suitable for large-scale industrial production; the TC4ELI titanium alloy bar prepared by adopting the preparation method is uniform and fine in structure, high in microscopic structure level and excellent in mechanical property.

The invention discloses a preparation method of copper-coated tungsten composite powder, belonging to the technical field of powder metallurgy. Corresponding tungsten powder and blue vitriod are employed according to the weight ratio of composite powder to be prepared and the tungsten powder is pre-treated; copper sulphate and seignette sol are dissolved into solution; bipyridine is added and NaOH is used to adjust pH value to 12-14; an appropriate amount of formaldehyde solution and the tungsten powder are added; the mixture is heated and then stirred continuously in constant-temperature bathing at 30-60 DEG C until the tungsten powder is red; the tungsten powder is washed, dried, reduced and annealed, thereby obtaining copper-coated tungsten composite powder. The preparation method of copper-coated tungsten composite powder has wide application range and is applicable to tungsten-powder coating coppers with different finenesses and shapes. The preparation method of copper-coated tungsten composite powder prepares copper-coated tungsten composite powder in different content ratios according to different requirements. The copper-coated tungsten composite powder obtained by the method of the invention has excellent sintering activity, thereby improving the combination property of tungsten copper alloy.

The invention discloses a GH4169 high-temperature alloy bar. The specification of the bar is phi 200-300 mm, the flaw detection level of the bar is not smaller than phi 1.2-9 dB, and the grain size is at the level 6 to the level 8. The invention further discloses a manufacturing method for the GH4169 high-temperature alloy bar. The method includes the steps that billet forging of the first heating number is carried out on a GH4169 ingot which is subjected to homogenizing heat treatment, and the ingot is subjected to two-upsetting and one-drawing processes; an obtained billet is subjected to reversing upsetting-drawing forging of the second and third heating numbers; drawing-out forging of the fourth and fifth heating numbers is carried out; and then chamfering and rolling forging of the sixth and seventh heating numbers is carried out to obtain the GH4169 high-temperature alloy bar. By means of the manufacturing method, the structure homogeneity of the bar is effectively improved, and the flaw detection level of the bar with the specification being phi 200-300 mm is made to reach more than phi 1.2-9 dB; after the bar is subjected to heat treatment, the macrostructure is uniform, and the grain size reaches the level 6 to the level 8; meanwhile, the performance of the large-specification bar subjected to standard heat treatment can meet corresponding standard requirements.

The invention relates to a process for homogenizing aluminum alloy, in particular to a process for homogenizing high-quality 6061 aluminum alloy for a reaction chamber liner of a plasma etcher, belonging to the technical field of non-ferrous metal heat treatment technique. The 6061 aluminum alloy comprises 0.4-0.6 wt% of Si, 0.8-1.2 wt% of Mg, 0.15-0.4 wt% of Cu, 0.01-0.35 wt% of Cr, less than 0.15 wt% of Fe, less than 0.15 wt% of Mn, less than 0.15 wt% of Ti and the balance of Al. The process provided by the invention comprises the following steps: carrying out furnace-heating on 6061 aluminum alloy cast ingots, keeping the temperature at 560+/-5 DEG C for 9 hours, discharging, and carrying out water quenching at room temperature. The homogenizing treatment can enhance the structural homogenity of the aluminum alloy matrix, redissolve the Mg2Si phase, and nodulize the iron-containing phase, thereby enhancing the effect of anodic oxidation and the corrosion resistance of aluminum alloy after anodic oxidation.

The invention relates to a hot-rolled steel wire rod for a large bridge cable rope zinc-plated steel wire over the 2000 MPa level. Chemical components of the steel wire rod comprise, by weight percentage, 0.90-1.10% of C, 0.20-0.60% of Si, 0.30-0.90% of Mn, smaller than or equal to 0.010% of P, smaller than or equal to 0.005% of S, 0.10-0.40% of Cr, 0.010-0.070% of Al, 0.02-0.15% of V, smaller than or equal to 0.05% of Cu, 20-40 ppm of Ca, 20-90 ppm of N and the balance Fe and inevitable residual elements. The content of sorbite texture of the steel wire rod is larger than or equal to 95%. Thethrough ring range of the tensile strength is smaller than or equal to 70 MPa (uniformity). After the steel wire rod is subjected to drawing and zinc plating, the tensile strength of the zinc-platedsteel wire is larger than or equal to 2000 MPa, and the number of torsions is larger than or equal to 12. According to the technical flow of the steel wire rod, pretreatment of molten iron is carriedout, steel is smelted through a converter or an electric furnace, LF refining is carried out, RH degassing treatment is carried out, continuous casting of 390*510 cogged ingot is carried out, a blankis reheated, the blank is rolled, the surface of an intermediate billet is subjected to finishing, the intermediate billet is reheated, the intermediate billet is rolled, the steel wire rod is subjected to EDC water bath toughening treatment, and the steel wire rod is collected and packed.

The invention relates to a preparation method of a TiBw/Ti-6Al-4V composite bar adopting a quasi-continuous reticular structure and solves problems that existing Ti-6Al-4V composites are harsh in technological condition, high in equipment requirement, low in production efficiency, difficult to produce on a large scale and the like. The method comprises steps as follows: low-energy ball milling and mixing are performed on spherical Ti-6Al-4V powder and TiB2 powder firstly; then TiB2/Ti-6Al-4V mixed powder is placed in a metal sheath for cold press molding, and vacuum degassing and sheath sealing welding are performed to obtain an extrusion billet; finally, short-time pre-sintering is performed on the obtained extrusion billet, and hot extrusion deformation is performed on the pre-sintered extrusion billet to obtain a required material. The method can be applied to preparation of a TiBw/Ti-6Al-4V composite adopting the quasi-continuous reticular structure.

The invention relates to high-quality H13 rear earth mold steel and a production method thereof, and belongs to the technical field of mold steel making. The high-quality H13 rear earth mold steel provided by the invention comprises the following ingredients based on weight percent: 0.37-0.42% of C, 0.80-1.20% of SiO, 0.20-0.50% of Mn, 5.00-5.50% of Cr, 1.20-1.75% of Mo, 0.80-1.20% of V, not greater than 0.025% of P, not greater than 0.005% of S, 0.001-0.010% of rear earth element, and the balance of Fe. The production method of the mold steel provided by the invention comprises the following steps of electric furnace smelting, ladle furnace LF refining, VD furnace vacuum degassing, rear earth-magnesium-calcium composite line feeding, argon-protected pouring, forging, annealing and thermal treatment. The mold steel provided by the invention has the following great advantages of high purity, high tissue uniformity, high mechanical property and isotropy, effectively improves the service life of a mold, and reduces production cost.

The invention discloses non-quenched and tempered steel for automobile parts and a production process thereof. The non-quenched and tempered steel comprises less than or equal to 0.20% of Ni, 0.010-0.025% of Ti, 0.012-0.025% of Nb and 0.013-0.019% of N. The process comprises converter smelting, LF refining, RH vacuum treatment, continuous casting and rolling. According to the non-quenched and tempered steel, through reasonable design of components, trace elements such as Ni, Nb, Ti and N are added to refine grains and improve the strength and toughness of the material; refining is carried outthrough a narrow component control technology, soft reduction is used in the continuous casting process, reasonable parameters are adopted to reduce the low-power defects of a casting blank, and the density of the material can be improved; and the structure is uniform through a high-temperature diffusion process in the rolling process, the grains are refined through a controlled cooling and controlled rolling technology, the strength is improved, and finally the comprehensive performance of the material is greatly improved.

The invention discloses a GH4169 high-temperature alloy free-forged bar billet. The GH4169 high-temperature alloy free-forged bar billet is characterized in that the specification is phi 250mm-350mm,the flaw detection level is not lower than phi 0.4dB-6dB, and the grain size is grade 8-9. The invention further discloses a preparation method of the bar billet. The preparation method comprises thefollowing steps that firstly, GH4169 high-temperature alloy cast ingots are smelted through a combined triple smelting process of vacuum induction smelting, electroslag remelting and vacuum self-consuming remelting, and high temperature homogenization treatment is carried out; secondly, upsetting, stretching, cogging and forging are carried out on the GH4169 high-temperature alloy cast ingots; then the billet materials obtained after cogging are deformed by upsetting and stretching, and the billet materials with the diameter of 400mm-500 mm are obtained; and finally, continuous remelting drawing forging is carried out on the billet materials obtained after upsetting and stretching at high-temperature to obtain the GH4169 high-temperature alloy free-forged bar billet with the diameter of 250mm-350mm. According to the preparation method , the grain size of the bar billet is controlled to be grade 8-9, the grain size grade difference from an edge part to a core part is controlled to be 1grade or within, and the structure uniformity of the large bar billet is improved.

The invention discloses a forging method for improving the microstructure uniformity of TC18 titanium alloy bars. The method comprises the following steps: heating TC18 titanium alloy ingots, carrying out upsetting and rolling forging once, and pressing down the forged ingots in a downward pressing process to crush an original cast microstructure; and carrying out upsetting and rolling forging on the obtained forging stock at a temperature being greater than a beta phase transition point 2-3 times, carrying out upsetting and rolling forging on the obtained forging stock at a temperature being smaller than the beta phase transition point 2-4 times to prepare a 16-surface object, and carrying out precise forging on the 16-surface object at a temperature of Tbeta-50DEG C once to finally produce TC18 titanium alloy bars with the diameter of 160-260mm. The method improves the microstructure uniformity of the TC18 titanium alloy bars and effectively reduces the deformation microstructure risk through adopting a less upsetting and rolling + high control precision precise forging technology on the premise of guaranteeing the refinement and fragmentation of the microstructure; and the method reduces the production cost and the quality risk and shortens the production period of the bars through reducing the forging frequency and adopting continuous melting, and is suitable for large-scale batch production of the TC18 titanium alloy bars.

The invention discloses a super-pure electro-slag remelting method for a super-invar alloy, which comprises the following steps of: a) preparing a self-melting electrode rod, namely performing vacuum induction melting on the components of the self-melting electrode rod of the super-invar alloy: 32 to 34 weight parts of Ni, 3.5 to 5.5 weight parts of Co and 60.5 to 64.5 weight parts of Fe, and casting to obtain a round rod, namely the self-melting electrode rod for electro-slag remelting; and b) performing electro-slag remelting, namely heating slag for electro-slag remelting, which is prepared from 40 to 85 weight parts of CaF2, 10 to 30 weight parts of GaO2 and 30 to 5 weight parts of Al2O3 into a melted state, pouring into a crystallizer, descending the self-melting electrode rod into the melted slag for electro-slag remelting, ensuring that liquid drops of the melted self-melting electrode rod pass through the melted slag layer and react with the slag, recrystallizing purified steel liquid at the bottom of the crystallizer to obtain an electro-slag ingot, forging to obtain a black rod, and performing solid solution and stabilization treatment to obtain the super-invar alloy. The purity of the super-invar alloy is improved, the structure is optimized, the thermal expansion coefficient is smaller, the processability of the alloy is improved, and the yield of a product is greatly improved.

The invention provides a TIG (tungsten inert gas) welding method for auxiliary mechanical vibration droplet transfer and a TIG welding device for the same. The TIG welding device comprises a TIG power supply, a wire feeder, a guide tube, an auxiliary mechanical vibration device, a wire feeding nozzle and a welding wire, wherein the wire feeder is connected with the guide tube, the guide tube is connected with the wire feeding nozzle, and the auxiliary mechanical vibration device is fixed to a frame. A vibration rod is driven to vertically vibrate in a reciprocating manner by an internal body driving motor and a transmission device, and a buffer spring is sleeved between the vibration rod and a contact. The TIG welding method includes the steps: igniting an arc heating workpiece, forming a molten bath after arc is stable, and then starting the wire feeder to automatically feed in the welding wire; and starting the auxiliary mechanical vibration device, leading the vibration rod, the contact and the welding wire to mechanically vibrate, and performing welding under the action of auxiliary mechanical vibration. The TIG welding device is simple, convenient in operation and high in applicability, and compared with digital control equipment, the TIG welding device greatly reduces cost and is convenient for industrial popularization.

The invention belongs to steel; it is a kind of die steel to be exact. The component of the die steel is composed of as follows: C, Mn, Si, S, P, Cr, M0, V, Ni, Cu, Nb, Fe margin. The die steel in this invention has these functions such as higher isotropism and the organization is uniform, it is able to endure heatproof strain, high temperature impact, polishing and burnish print, corrode, it is suitable to the forge hot mould and special mould that has strict request of polishing, figure, it can be apply to mechanical manufacture industry broadly.

The invention provides a method for preparing a TiAl-based composite material plate, and relates to a method for preparing the composite material plate. The method solves the problems that TiAl-based alloy prepared by the prior process has poor uniformity and compactness in texture and serious internal oxidation phenomenon, and only block body TiAl-based composite material can be prepared by a composite strengthening and toughening method. The method of the invention comprises the following steps that: firstly, aluminum-based composite material plates and pure tatinium plates are alternately laminated and subjected to hot pressing and hot rolling to prepare a multilayer composite plate; and secondly, the multilayer composite plate is subjected to heat treatment to prepare the TiAl-based composite material plate. The TiAl-based composite material plate obtained by the method has good uniformity and compactness in texture, and has no internal oxidation; and compared with the block body TiAl-based composite material, the plate type TiAl-based composite material has convenient use and wide application field.

The invention relates to a laser cladding repair process for cross shafts. The process comprises the following steps of: A. carrying out treatment on the surface of the cross shaft, and carrying out failure analysis; B. carrying out 80-150 DEG C overall preheating on the cross shaft; C. according to failure analysis results of the cross shaft, optimizing process parameters, and carrying out laser cladding, wherein adopted alloy powder comprises the following components in percentage by weight: less than or equal to 0.1% of C, 10-13% of Cr, 1.5-2.5% of B, 1-2% of Si, 0.5-1.2% of Mo, 8-12% of Mn, 6-12% of W, 5-15% of TiO2, and the balance of Fe; and D. carrying out detection. According to the laser cladding repair process for the cross shafts, disclosed by the invention, through carrying out the laser cladding on the surface of the cross shaft, the size of the cross shaft can meet the application requirements, and the hardness and the wear resistance of the cross shaft subjected to repair exceed the original hardness and the original wear resistance of the cross shaft.

The invention relates to the field of processing of metal laminated plate belts, in particular to a method for rolling a magnesium-aluminum laminated plate by a drum-shaped corrugated roller. The method comprises the following steps of selecting a magnesium alloy plate with the same length and width as a clad plate and a pure aluminum or aluminum alloy plate as a base plate, cleaning the surface of the metal plate, buckling and assembling the ground surfaces of the base plate and the clad plate together, or buckling and stacking and assembling together. In the first pass, when the drum rolleris used for rolling the magnesium-aluminum laminated plate, a stress peak value can be formed on the lowest metal interface of the laminated plate, and the combination of the middle part of the laminated plate and the wave trough of the wave interface is promoted. In the second pass flattening process, a stress peak value is formed on the edge part of the laminated plate with poor bonding and themetal interface at the wave peak part during the first pass rolling of the plate, large plastic deformation is generated at the same time, and the bonding of the edge part of the laminated plate is promoted. According to the process, rolling is carried out twice in sequence, the bonding of the whole interface is promoted, and the bonding strength of the interface of the laminated plate is improved.

The invention relates to a device and a method for the counter-gravity casting of solidification process controlled titanium-based alloy. The device comprises a smelting system and a suction casting system, wherein casting mold heaters are mounted on the inside surface of an upper furnace body of the suction casting system; liquid riser tube heaters are fixedly arranged on the inside surface of a transition chamber between the upper furnace body and a lower furnace body. According to the device and the method, during counter-gravity casting, ceramic casting molds are subjected to heating and heat preservation through induction heating devices of the upper furnace body, so that the pouring temperature of the ceramic casting molds is greatly increased, the fluidity of titanium-based alloy melt is improved, and also, the complete mold filling of titanium-based alloy liquid metal is realized; through adjusting the power of the casting mold heaters, the change of different cast part cooling speeds in the range between 1,400 DEG C and the room temperature can be realized, the aims of controlling the cooling speed and solidification path of cast parts is achieved, thus, alpha crystal grains are spheroidized, and the cast parts with excellent tissue uniformity are obtained.