30results about How to "Obvious refinement" patented technology

The continuous thin plate blank casting and rolling process for producing high strength V-N micro alloy steel belt includes smelting and refining in electric furnace or converter, continuous casting, heating after solidification inside bottom heating furnace, hot rolling, laminated flow cooling and winding. The continuous thin plate blank casting and rolling process has the technological parameters of: furnace entering temperature of cast blank 900-1050 deg c, homogeneous heating temperature 1050-1250 deg c, initially rolling temperature 1000-1170 deg c, finally rolling temperature 840-950 deg c and winding temperature 530-670 deg c. The molten steel contains: C 0.03-0.08 wt%, Si 0.01-0.8 wt%, Mn 0.1-2.0 wt%, V 0.01-0.20 wt%, Al 0.01-0.06 wt% and N 0.002-0.03 wt%. The produced high strength and fine grain steel belt and plate has ferrite grain size smaller than 6.0 micron, yield strength of 420-700 MPa, and excellent toughness, welding performance and forming performance.

The invention discloses Ti-V composite microalloying superfine bainite non-quenched and tempered steel and a controlled forging and controlled cooling process and a production process thereof. The Ti-V composite microalloying superfine bainite non-quenched and tempered steel comprises following chemical components: by weight, 0.20-0.30% of C, 0.20-0.40% of Si, 1.90-2.10% of Mn, less than or equalto 0.010% of P, 0.030-0.050% of S, 0.40-0.60% of Cr, 0.10-0.20% of V, 0.030-0.050% of Ti, less than or equal to 0.20% of Ni, less than or equal to 0.20% of Mo, 0.015-0.045% of Al, less than or equal to 0.0070% of N, and the balance Fe and inevitable impurity elements; and moreover, Ti-3.43*N is greater than or equal to 0.017%, and Ti*N is less than or equal to 0.00016%. Compared with common bainite non-quenched and tempered steel, the Ti-V composite microalloying superfine bainite non-quenched and tempered steel has the advantages that the bainite structure is refined obviously, the similar tempered sorbite structure is obtained, and the strength and toughness are substantially improved through the high-Ti alloying design and V-N microalloying.

A prepared method of semi-solid spherocrystal A-alloy is to treating the alloy fusant by the process of 'refining after metamorphism' or 'metamorphism after refining'; preparing the semi-solid by the reversible electromagnetic stirring; monitoring the temperature while stirring until the temperature is under the liquid phase 3-5 Deg C., then cooling and geting the product. The efficient of the process has been improved more greatly than the traditional one, and the alloy has been more available crystal nucleus.

The invention discloses a process capable of improving the mechanical properties of an A356.2 aluminum alloy. The process comprises following main steps: a melt combined modification-refinement treatment after alloy melting, casting, solid solution, and a double stage aging heat treatment. Specifically, the process comprises following steps: (1) heating and melting A356.2 aluminum alloy, and adding a refining agent and a modifying agent to process the melt; (2) removing gas from the alloy melt, refining the alloy melt, allowing the alloy melt to stand still, removing the slag, and carrying outcasting to obtain a casting; (3) maintaining the temperature of the casting in a range of 530 to 550 DEG C for 4 to 8 hours, and carrying out quenching by using water with a temperature of 20 to 80 DEG C; and (4) maintaining the temperature of the casting in a range of 100 to 120 DEG C for 0.5 to 2 hours, then maintaining the temperature of the casting in a range of 165 to 185 DEG C for 2 to 6 hours, taking out the casting out of a furnace, and cooling the casting in the air. After processing, the mechanical properties of the A356.2 aluminum alloy are obviously enhanced, the yield strength isimproved by 40 to 50%, and the elongation rate is increased by 20 to 40%.

The invention discloses a magnesium-air battery cathode material and a preparation method thereof, and relates to the technical field of magnesium-air batteries. The magnesium-air battery cathode material comprises the following components in percentages by weight: 1.0-5.0wt% of Zn, 0.1-2.0wt% of Ca and the balance of magnesium. The preparation method comprises the following steps: (1) weighing pure magnesium, pure zinc and Mg-Ca intermediate alloy according to 1.0-5.0wt% of Zn, 0.1-2.0wt% of Ca and the balance of magnesium, and removing oxide skin on the surface; (2) placing an alloy treatedin the step (1) in a crucible to be preheated, and sequentially placing the alloy in the crucible to be melted; and (3) casting molten liquid in the step (2) in a metal mold at a proper temperature for cooling. According to the preparation method, a hydrogen evolution reaction of a metal cathode in an NaCl neutral solution is relieved, the discharging process is optimized at the forming position of the second phase of dotted Ca2Mg6Zn3, the stacking thickness of a discharging product on the surface of the cathode is reduced, and product falling is accelerated.

The invention discloses an ultrahigh-strength aluminum alloy composite strip for an automobile water tank radiator and a manufacturing method for the ultrahigh-strength aluminum alloy composite strip. The composite strip is composed of a core material and a single-sided or double-sided braze welding layer, wherein the thickness of the welding layer on each surface accounts for 5-10% of the total thickness; the core material consists of the following components in percentage by weight: 0.12-0.26% of Fe, less than or equal to 0.12% of Si, 0.30-0.80% of Cu, 1.5-1.8% of Mn, less than or equal to 0.04% of Mg, 0.02-0.15% of Cr, 0.02-0.15% of Zr, 0.02-0.15% of Ti, less than or equal to 0.03% of each of other elements, less than or equal to 0.15% of contents of all other elements, and the balance of aluminum; the welding layer is made of an aluminum-silicon alloy which consists of the following components in percentage by weight: less than or equal to 0.20% of Fe, 8.0-11.0% of Si, less than or equal to 0.10% of Cu, less than or equal to 0.05% of Mn, 0.03-0.06% of Sr, less than or equal to 0.05% of Ti, less than or equal to 0.03% of each of other elements, less than or equal to 0.15% of all other elements, and the balance of aluminum. The ultrahigh-strength aluminum alloy composite strip has very excellent mechanical property after braze welding, and has yield strength which exceeds 70 MPa after braze welding.

The invention provides a method for improving strength of soldered seams on the basis of thin-melt ultrasonic fine crystallization treatment in narrow gaps, and relates to the technical field of material welding. The invention aims at solving the problems that for an existing soldering connection method, due to the fact that the welding cycle is long and the welding temperature is high, soldered seam metal is large in crystal size and nonuniform in texture, and the soldered seams are low in strength. The method comprises the steps that 1, soldering materials and parent metal are assembled into a to-be-soldered part, and parent metal lapping gaps are adjusted and controlled; 2, preliminary soldering is conducted; and 3, thin-melt ultrasonic fine crystallization treatment is conducted. After soldering is conducted through the method, the crystal size of the soldered seams is obviously refined, and toughness of the soldered seams is greatly improved. According to the method, the technology is simple, the operation cost is low, fine crystal strengthening of the soldered seams of aluminum-alloy, copper-alloy, magnesium-alloy and aluminum-matrix composite materials and ceramic and ceramic-matrix composite materials can be achieved, and the method can be used for the engineering application field of complex structural components.

The invention discloses an Mg-Nd-Zn-Zr alloy material containing Y. The Mg-Nd-Zn-Zr alloy material is characterized by comprising the following components in parts by mass: 0.2 of Zn, 0.4 of Zr, 2.0 of Nd, 4-8 of Y, and the balance of Mg. A preparation process is characterized in that pure magnesium, pure zinc, 30% of Zr magnesium zirconium intermediate alloy and 31.72% of Y magnesium yttrium intermediate alloy are smelted by using a RJ-2 covering agent at a smelting temperature of 770 DEG C, are stood by 15 minutes after being totally molten, are poured in an iron mold, preheated to 200 DEG C, at 720 DEG C, and are molded by pouring.

The invention discloses a single-drum vibration mill adopting variable-pitch non-closed-coil springs and media in the mixed density. A main vibration system comprises a vibration motor which is controlled by a frequency converter and used as a vibration exciting source and a grinding drum fixed to the vibration motor; the vibration motor, the grinding drum and an upper mass plate form an upper mass; one end of a main vibration spring group is connected with the upper mass; the other end of the main vibration spring group is connected with a base; and the main vibration spring group comprises the multiple variable-pitch non-closed-coil helical springs, and each spring is formed by coiling one steel wire. The vibration mill has the positive, obvious and unique effects and has the characteristics of being capable of realizing ultrafine particle refining, realizing de-agglomeration and narrowing the powder product distributing zone, low in energy consumption, high in grinding efficiency, high in energy utilization rate, capable of realizing effective energy storage, saving energy, running stably and remarkably reducing the noise, good in vibration isolating effect and the like.

The invention discloses a magnesium-air battery anode material and a preparation method thereof, and relates to the technical field of magnesium-air batteries. The magnesium-air battery anode materialis prepared from the components: 2.0-3.0 wt.% of Al, 0.8-1.1 wt.% of Zn, 1.0- 7.5 wt.% of Gd and the balance of magnesium. The preparation method comprises the following steps that (1) an AZ31 magnesium alloy, pure aluminum, pure zinc and an Mg-Gd intermediate alloy are weighted according to 2.0-3.0 wt.% of Al, 0.8-1.1 wt.% of Zn, 1.0- 7.5 wt.% of Gd and the balance of magnesium, and surface oxide skin is removed; (2) the metal and the alloy of which the oxide skin is removed in the step (1) are put into a preheated crucible, and heating is carried out to 700 DEG C until the metal and the alloy are molten; and (3) the solution in the step (2) is heated to 780 DEG C, the temperature is kept for 5 minutes, rapidly cooling is carried out to 720 DEG C, and the solution is cast into a graphitemold preheated to 200 DEG C for cooling. Hydrogen evolution reaction of a metal anode in a NaCl neutral solution is inhibited, the formation of a needle-like Al2Gd second phase optimizes the discharge process, the falling of discharge products on the surface of an electrode is accelerated, the peeling of anode metal particles is reduced, the discharge reaction area is increased, and the specificcapacity and power density are improved.

The invention relates to a preparation method of a wear-resistant metal-multi-element ceramic composite modified coating on the surface of a titanium alloy, and belongs to the technical field of surface engineering. The preparation method of the wear-resistant metal-multi-element ceramic composite modified coating on the surface of the titanium alloy comprises the following steps: (1) preparing pre-alloyed powder for later use; (2) cleaning the to-be-clad surface of a base material by adopting industrial alcohol, and then carrying out blackening treatment on the surface of the base material; and (3) coaxially conveying the pre-alloyed powder prepared in the step (1) to the to-be-clad surface of a base material, which is treated in the step (2), carrying out laser cladding, and preparing to obtain the wear-resistant metal-multi-element ceramic composite modified coating on the surface of the titanium alloy. The composite modified coating prepared through the preparation method is obvious in grain refinement, the purpose of grain refinement strengthening is achieved, the coating is guaranteed to have high hardness and high toughness at the same time, and therefore the wear resistance of the titanium alloy can be greatly improved, and then the service life of the titanium alloy under a complex working condition is prolonged.

The invention provides a mixed density medium double-plastid vibration mill with convex springs without join of cycles. The vibration mill comprises a main vibration system and a vibration isolation system; the main vibration system comprises a vibration motor controlled by a frequency converter and used as an excitation source, and a milling cylinder fixed to the vibration motor; an upper plastid is made up of the vibration motor, the milling cylinder and an upper plastid plate, and one end of a lower plastid is connected to a main vibration spring set; the lower plastid is connected to the vibration isolation system through the main vibration spring set; the vibration isolation system comprises isolation springs connected to the other end of the lower plastid, and each isolation spring is connected to a foundation through a base; and the main vibration spring set is composed of a plurality of convex coil springs without join of cycles, and each spring is formed by winding a steel wire. The vibration mill provided by the invention has the characteristics of ultrafine particle refinement, disaggregation, narrowing of powder product distribution zone, low energy consumption, high grinding efficiency, high energy utilization rate, effective energy storage, energy saving, stable operation, obvious noise reduction, good vibration isolation effect, etc.

The invention discloses a high-strength heat-conducting magnesium alloy and a preparation method thereof. The magnesium alloy comprises, by weight: Zr: 0.2-0.6%, Zn: 4-6%, Ca: 0.4-0.8% and the balanceMg. The preparation method of the magnesium alloy comprises the steps of burdening, adding a magnesium ingot, adding an intermediate alloy, refining, casting, carrying out solution treatment, carrying out extrusion deformation, carrying out the solution treatment again and carrying out aging treatment. According to the high-strength heat-conducting magnesium alloy and the preparation method thereof, in order to promote the formation of alloy Zn-Ca clusters, different Zn-Ca intermediate alloys are selected during the smelting, and the short-time solution treatment is carried out for 1 h or less after the hot extrusion; the tensile strength of the alloy is greater than 325 MPa, the yield strength of the alloy is greater than 280 MPa, the elongation of the alloy is greater than 15%, and theheat conductivity of the alloy is greater than 120 W.(m.K)<-1>; and the magnesium alloy is high in yield, good in processing formability, easy for realizing industrialization, and capable of being used as a heat dissipation structural material of a power supply and electronic device in the field of new generation aerospace.