14results about How to "Refined grain structure" patented technology

A high-alloy steel electroslag ingot and its homogenization method are provided, comprising the following steps: S1, electroslag ingot pretreatment: removing surface oxide scale and crack defects, and grinding to a surface roughness Ra≤6.3μm; S2, staged heating: heating to 800-900℃ at a rate ≤100℃ / h and holding for 2-6h; heating to 1000-1100℃ at a rate ≤100℃ / h and holding for 2-6h; heating to 1200-1300℃ at a rate ≤150℃ / h and holding for 10h. -20h; S3, Stepped cooling: Turn off the heating device and cool with the furnace to 800-1000℃, hold for 2-6h; cool to 500-650℃ at a rate of ≤50℃ / h, hold for 2-6h; open the furnace door and introduce cooling air at a speed of 0.5-3m / s to cool to room temperature, obtaining homogenized high-alloy steel electroslag ingots; S4, Post-homogenization testing: the relative standard deviation of each alloying element is ≤5%; the average grain size is ≤10μm; the Brinell hardness fluctuation range is ≤15HBW. This invention eliminates component segregation, refines grain structure, optimizes process parameters, is highly efficient and energy-saving, easy to promote, and has strong practicality.

The application provides a 1700MPa-grade hot forming steel with high cold bending performance and a preparation method and application thereof. A surface layer of the hot forming steel has soft ferrite structure, a subsurface layer has mixed structure of soft ferrite and martensite, and a core layer has carbon-poor martensite structure. The preparation method comprises any one or a combination of at least two of the following conditions: (A) the coiling temperature after hot rolling is 650-700 DEG C; (B) the pickling speed is less than or equal to 150 m / min; (C) the temperature of continuous annealing is 780-830 DEG C; (D) the atmosphere in the furnace is a mixture of nitrogen and hydrogen; (E) the dew point temperature is-35 DEG C to-17 DEG C. Through fine component design and process integration, the application successfully solves the contradiction between material strength and toughness, realizes double guarantee of high strength and high toughness, simultaneously meets the light weight requirement, and improves the competitiveness of existing products.

The invention discloses a corrosion-resistant and high-performance aluminum alloy cable material as well as a preparation method and application thereof, and relates to the technical field of aluminum alloy preparation. The component formula of the conductor is Al-xMg-ySi-zNi-mCe-nSc-qY, x is larger than or equal to 0.05 and smaller than or equal to 0.3, y is larger than or equal to 0.6 and smaller than or equal to 1.4, z is smaller than or equal to 0.35, m is larger than or equal to 0.01 and smaller than or equal to 0.2, n is larger than or equal to 0.03 and smaller than or equal to 0.2, q is larger than or equal to 0.04 and smaller than or equal to 0.1, iron is a main impurity element in the alloy, and the content of the iron is not larger than 0.1%. The aluminum alloy cable material with excellent mechanical properties (the tensile strength is larger than or equal to 122 MPa, and the elongation is larger than or equal to 14%), electrical properties (the conductivity is larger than or equal to 62% IACS) and corrosion resistance (the maximum IGC depth is smaller than 100 micrometers) is prepared by adopting the technological method of flame direct injection smelting, synchronous water quenching pull casting, cold forming machining and non-isothermal aging synchronous heat treatment, and the aluminum alloy cable material is suitable for aluminum alloy cables. The method is short in technological process, good in cable quality, high in corrosion resistance and wide in application prospect.

The invention belongs to the technical field of casting, and provides an investment casting process of a martensitic stainless steel material part, according to the investment casting process of the martensitic stainless steel material part, through introduction of silicon carbide and metamorphism of a rare earth ferrosilicon alloy, the thermal expansion coefficient of steel is reduced, and the performance of the martensitic stainless steel part is improved. And meanwhile, structure grains in the martensitic stainless steel solidification process are remarkably refined, formation of thick and large matrix structures is reduced, and therefore internal stress generated in the casting solidification stage is reduced. And meanwhile, the plasticity and toughness of the material can be improved through the refined crystal grains, the adaptive capacity of the casting to martensite transformation volume change in the subsequent heat treatment process is enhanced, accumulation of internal stress is relieved, and finally cracks are effectively restrained. Compared with existing schemes such as casting temperature optimization and shell deformability adjustment, the process improves the material performance from the structure level through modification treatment, the anti-cracking capacity of the casting can be fundamentally improved, meanwhile, the size precision and the mechanical property of the casting are considered, and the bottleneck of the prior art is broken through.

The present application relates to the technical field of titanium-based cathode roller, in particular to a large-size titanium-based cathode roller and a processing technology thereof, comprising the following processes: step one, taking a blank to carry out high-temperature blooming upsetting, punching, hole expanding, mandrel drawing, and obtaining a ring blank; step two, taking the ring blank obtained in step one to perform dressing and marking inspection; step three, taking the ring blank obtained in step two to perform turning, and obtaining a ring piece; step four, taking the ring piece obtained in step three to perform post-processing, and obtaining a cathode roller. The present application uses a new technology of forging-rolling combination to successfully produce a whole seamless ring piece at one time, which can effectively meet the requirements of the cathode roller on the morphology and mechanical properties at the microstructure level, and eliminate the occurrence of periodic bright band during the production of copper foil by the customer.

The application discloses a method for electron beam fuse additive manufacturing of beta titanium alloy components, and belongs to the technical field of additive manufacturing. The application aims to solve the problems of long preparation period, low efficiency, low utilization rate, serious oxidation, significant beta spot and poor strength and toughness of the prior art. The method comprises the following steps: pretreating the printing wire and the substrate; establishing a three-dimensional entity model based on the target beta titanium alloy component, performing slice processing on the three-dimensional entity model to generate multi-layer two-dimensional slice data, and then importing the slice data into an electron beam fuse additive manufacturing equipment, and setting a scanning path, preheating parameters and printing process parameters; starting the equipment and performing vacuumization, printing the beta titanium alloy according to the set printing parameters and procedures, completing all layers, and obtaining the beta titanium alloy component. The beta titanium alloy component prepared by the application has high density, and provides a reliable technical approach for the preparation of high-performance beta titanium alloy components in the fields of aviation and aerospace.

This invention belongs to the field of aluminum-based composite material preparation technology, and relates to a continuous casting and rolling method for preparing aluminum-based composite material strips. The method involves preparing a reinforcing preform with a thickness not exceeding the roll gap distance in the aluminum-based composite material strip. Before preparing the aluminum-based composite material strip, the casting rolls are water-cooled and run at a set speed. Molten aluminum is injected into the molten pool, and the liquid level is controlled to a set value. Throughout the preparation process, the molten pool liquid level is maintained at the set value. The molten aluminum cools and solidifies upon contact with the roll surface of the casting rolls. Under the casting action of the two casting rolls, an aluminum alloy strip is formed and continuously output from the lower end of the roll gap. During the preparation process, the reinforcing preform moves from top to bottom at a set speed and is immersed in the molten aluminum pool. The molten aluminum penetrates into and fills the interior of the reinforcing preform. The reinforced preform, filled with molten aluminum, gradually solidifies as it moves to the roll gap until it is completely solidified. Then, under the casting force of the two casting rolls, it undergoes rolling deformation to form the aluminum-based composite material strip.

The invention provides a laser vibration cladding device and a method thereof.The device comprises an annular heating cover and an infrared focal plane detector which are arranged in a working cabin with a laser cladding head, and a plurality of independently-controlled infrared heating units evenly distributed in the circumferential direction of the annular heating cover are arranged on the annular heating cover; a workpiece clamping position is arranged below the circle center of the annular heating cover, and the infrared heating units all point to the workpiece clamping position. A multi-channel coaxial powder feeder is further arranged in the working cabin, a plurality of independently-controlled powder bins are integrated in the multi-channel coaxial powder feeder, a powder feeding pipe of the multi-channel coaxial powder feeder is integrated with the laser cladding head, and powder in all channels is converged before entering the powder feeding pipe and conveyed to the laser cladding head through inert gas flow; and an ultrasonic generator, a piezoelectric transducer and a vibration transmission rod are also arranged in the working cabin.

The invention provides neodymium-containing high-corrosion-resistance laser cladding powder for a mining hydraulic oil cylinder and a cladding method, the neodymium-containing high-corrosion-resistance laser cladding powder comprises Nd2O3 powder and alloy powder, the mass percent of the Nd2O3 powder is 0.4%-1.0%, and the balance is the alloy powder; the alloy powder comprises the following components in percentage by mass: 19.2%-20.8% of Cr, 4.0%-8.0% of Ni, 0.3%-0.75% of Mn, 4.5%-8.5% of Mo, 0.04%-0.08% of C, 1.35%-1.52% of Si and the balance of Fe. In an inert atmosphere, the neodymium-containing high-corrosion-resistance laser cladding powder for the mining hydraulic oil cylinder is used for carrying out laser cladding on the outer surface of the mining hydraulic oil cylinder. The cladding method also has the advantages of moderate hardness, good wear resistance, strong purification capability and low hot crack sensitivity on the premise of ensuring that the cladding layer has better corrosion resistance.

This invention discloses a method for synergistic control of residual stress and microstructure in a pulsed current-assisted metal additive manufacturing process, belonging to the field of metal material additive manufacturing technology. The method includes the following steps: S1, setting the process parameters for metal additive manufacturing and planning the area and timing for synchronously applying pulsed current; S2, during the layer-by-layer deposition process of the component, when a high-energy laser beam, electron beam, or electric arc acts on the deposition area to form a molten pool, a pulsed power supply is triggered by a synchronous control unit to apply a pulsed current with preset parameters to the molten pool and the heat-affected zone; S3, through the synergistic effect of the electroplasticity and Joule heating of the pulsed current, thermal stress relaxation, grain refinement, and microstructure homogenization are simultaneously achieved during the manufacturing process. This invention, by employing the above method and precisely controlling the electrical pulse parameters, simultaneously achieves stress relaxation and solidification microstructure optimization during the manufacturing process, significantly improving the dimensional stability, fatigue life, and mechanical properties of the formed component.

The application discloses a kind of GH3536 alloy targeted titanium microalloying and preparation method thereof, and the application is prepared into titanium-containing pre-polymer colloid by acetylacetone titanium, polyvinyl alcohol, polyvinylpyrrolidone, polyethylene imine, citric acid and ethylene glycol, coated on the surface of GH3536 alloy powder and pyrolyzed by program temperature, pre-constructed carbon-nitrogen co-doped porous carbon limited titanium dioxide coating on the surface of powder, then layer-by-layer forming is carried out by using coaxial powder feeding type laser melting deposition process, in situ release titanium atom by carbon thermal reduction reaction in laser molten pool and make it to segregate at the grain boundary of solidification front, while interlayer is supplemented with ultrasonic vibration treatment.The application realizes the targeted microalloying of titanium element in the process of laser melting deposition of GH3536 alloy, improves the distribution form of grain boundary carbide;The elongation after fracture of deposited sample of the application is improved by 39.4%~50.7% compared with untreated sample, and the strength-plastic product is improved by 63.0%, and the grain boundary liquidized crack is inhibited.

This invention discloses a method for improving the microstructure and properties of double-wire submerged arc welded joints for bridge steel, belonging to the field of steel structure welding technology. The method includes: employing a double-sided V-groove design; selecting TMW-C2NiKq welding wire with a Ni content of not less than 0.24% and TMW-B121q flux; maintaining the interpass temperature at 90–130℃ by controlling the current-voltage matching and heat input of the double wires within the range of 80–110 kJ / cm; and effectively suppressing the expansion of the coarse-grained zone and the formation of the weld softening zone by combining alternating positive and negative welding sequences. After welding, the width of the coarse-grained zone of the joint is ≤2.6 mm, the microhardness of the softest zone is ≥140 HV10, and the impact absorption energy at –40℃ is ≥120 J. This method requires no additional equipment, is suitable for the efficient manufacturing of welded structures of 30–50 mm thick bridge steel, and has good process stability and promising engineering application prospects.

The invention discloses 5-series mirror surface aluminum, a preparation method thereof and application of the 5-series mirror surface aluminum in automobile mirror surface aluminum products, and belongs to the technical field of metal materials. The method comprises the steps that S1, a cast ingot is obtained; s2, homogenizing heat treatment; s3, hot rolling treatment is conducted, the initial rolling temperature is 460-480 DEG C, and the final rolling temperature is 270-300 DEG C; s4, cold rolling treatment; s5, intermediate annealing treatment is carried out, the temperature is 300-320 DEG C, and heat preservation is carried out for 5-15 s; s6, mirror surface rolling is conducted; s7, annealing treatment is conducted on a finished product, the temperature is 280-300 DEG C, and heat preservation is conducted for 2-6 h; and S8, machining and anodic oxidation treatment are conducted in sequence, and the 5-series mirror aluminum is obtained. According to the mirror surface aluminum, the Cube texture accounts for 3%-5%, the surface is free of material lines, the glossiness ranges from 600 GU to 680 GU, the tensile strength ranges from 120 MPa to 165 MPa, the yield strength ranges from 80 MPa to 125 MPa, and the ductility ranges from 13% to 18%.

This utility model relates to the field of hammerhead casting technology, and more particularly to a casting mold for a dual-liquid bimetallic composite hammerhead. A casting mold for a dual-liquid bimetallic composite hammerhead includes a fixed frame, a controller, mold bodies, tie rods, a first arc plate, and a second arc plate. The controller is fixedly connected to the upper part of the fixed frame. Mold bodies are symmetrically slidably placed inside the fixed frame. Tie rods are fixedly connected to both sides of the top of the two mold bodies. A casting cavity is formed inside the two mold bodies. A first arc plate is fixedly connected to one side of the top of each mold body, and a second arc plate is fixedly connected to the top of each mold body. This utility model, through the vertical lifting motion of the push plate and the coordinated action of the guide groove on the top block and mold body, efficiently converts the linear motion driven by the motor into the symmetrical separation action of the mold body, achieving automatic mold opening.