42results about How to "Reduce micro segregation" patented technology

The application discloses a Cu-Ni-Co-Sn-P copper alloy which comprises the following components in percentage by weight: 0.2-1.0% of Ni, 0.5-1.5% of Sn, 0.2-1.0% of Co, 0.001-0.01% of P, and the balance of Cu. The tensile strengthsigma b of the copper alloy can reach 550-700MPa, the plastic elongation rate delta is 8-15%, the electric conductivity is 35-45% IACS, the anti-stress-relaxation property (120 DEG C, 1000h) is more than or equal to 95%, the soft-resistant performance (450 DEG C, 3 minutes) is more than or equal to 150HV, and the heat shrinkage rate (450 DEG C, 1 minute) is less than or equal to 0.01%. The invention discloses a preparation method of the Cu-Ni-Co-Sn-P copper alloy.

The invention provides an austempered ductile iron adjusting chemical component. The chemical component uses Mn and Si as a base to substitute Mo and Ni, and contains a plurality of elements comprising Cu, B, Nb and Cr to realize low and micro alloying, so the respective effects of all elements are fully performed, the interactive effect promotion is realized, the hardenability is increased, the alloy consumption is reduced, and the cost is reduced. The invention also provides a new austempered ductile iron quenching technology matched with the austempered ductile iron. The technology is a step austempering technology using step quenching oil and an air isothermal furnace. The heat treatment of a workpiece through the technology realizes crystal grain refinement, good hardenability, high strength and toughness, low hardness (HB190-240) before the step austempering treatment, and good processing performances; and the obtained processed austempered ductile iron has a high hardness (HRC35-56) and extremely less oxidation and deformation, so the precision is guaranteed, and finishing treatments comprising grinding and the like are not needed. Compared with traditional nitrate bath austempering technologies, the austempered ductile iron quenching technology has the advantages of low cost, no generation of large amounts of harmful substances comprising nitrite or the like, low pollution and safety.

The invention discloses a Cu-Ni-Si-Co-Ti-Re copper alloy. The Cu-Ni-Si-Co-Ti-Re copper alloy comprises the following components in percentage by weight: 0.5%-2.0% of Ni, 0.2%-0.9% of Si, 0.5%-2.0% of Co, 0.1%-0.5% of Ti, 0.05%-0.2% of RE and the balance Cu, wherein RE is one or more of Ce, La and Y. The Cu-Ni-Si-Co-Ti-Re copper alloy has tensile strength sigma b which can reach 800-1000 MPa, plastic ductility sigma of 3-10%, electrical conductivity of 45%-55% of IACS, anti-stress-relaxation property greater than or equal to 80% (working for 1000 hours at a temperature of 200 DEG C). The invention further discloses a preparation method for the Cu-Ni-Si-Co-Ti-Re copper alloy.

The invention discloses a magnesium alloy asymmetric continuous large-deformation extrusion processing die, and belongs to the field of non-ferrous metal plastic forming. The asymmetric continuous large-deformation extrusion processing die comprises an upset-extruding cavity at the upper part and an extruding cavity at the lower part, and a forming channel hole can be designed to be in an asymmetric type. The extrusion deformation of one side of a casting material is large while the extrusion deformation at the other side is small, so that the deformation is intensified. Die cores are detachable, and various types of die cores which can be suitable for different sizes are designed, so that different production requirements can be met. After one casting material is deformed, the casting material can be quickly replaced with the next casting material, so that continuous production is realized. The die is mainly used for realizing continuous extrusion forming of a sheet of a magnesium alloy sheet-shaped casting material, and the magnesium alloy sheet-shaped part which is uniform in structure and optimized in performance can be obtained through the processing technology.

The invention discloses a Cu-Fe composite double-melt mixed casting equipment and process, comprising a first melting furnace for heating and melting pure Cu; a second melting furnace for heating and melting Cu-Fe alloy; a mixing chamber, The flow guide tube communicates with the liquid outlets of the first melting furnace and the second melting furnace to mix the heated and melted pure Cu and Cu-Fe alloy; The body is heated and electromagnetically stirred; the crystallizer is docked with the liquid outlet of the mixing chamber; the stopper mechanism is used to control the opening and closing of the liquid outlet and the melt flow of the first melting furnace and the second melting furnace; An air pressure regulating mechanism for adjusting the air pressure in the first melting furnace and the second melting furnace. The casting equipment and process not only solve the problem of inhomogeneous composition and structure of Cu-Fe composite materials in the casting process, but also can significantly improve production efficiency and reduce production costs, and are suitable for industrial scale production.

The invention discloses a method for realizing fine crystal solidification by controlling spherical crystal stabilization. A method of combining oxide crucible, glass purifying, circulating and overheating, medium-frequency electromagnetic induction is adopted under vacuum environment, so that melt which is circulated and overheated by multiple times is slowly cooled to the liquid-phase line temperature. Temperature-equalizing and stirring are carried out by utilizing electromagnetic fields, so that temperature and solute of the whole melt are almost uniformly distributed, wherein the whole melt is enabled to be uniformly cooled integrally during the cooling process. According to the method disclosed by the invention, high-temperature alloy fine-grained structure, which is free of a tricrystal region of the conventional solidified ingot, small in microporosity, provided with fine equiaxed grains with grain size level of about ASTM (American Society for Testing Material) 5 level, small in microsegregation and high in density, can be obtained by the method disclosed by the invention. The grain size of the obtained fully equiaxed ingot is close to that of the spherical crystal and is very beneficial to the subsequent deformation, therefore, the billeting success rate of the high-temperature alloy is effectively improved.

The invention belongs to the technical field of metal material manufacturing, and particularly relates to a production method of an X80 pipeline steel strip with the thickness of 6-10 mm. The production method comprises the following steps: (1) smelting, (2) continuous casting, (3) casting blank heat transferring, (4) casting blank reheating, (5) rough rolling, (6) finish rolling, (7) laminar cooling and reeling, and (8) storing and sampling. The production method can save investment and reduce the occupied land area and energy consumption, and moreover has the advantages of thick and thin slab hot continuous rolling technologies.

The invention relates to a homogenized copper-nickel-tin alloy rod and a preparation method thereof. The formula is as follows in terms of mass percentage: Zn is 0.01%-0.026%, Sn is 7.9%-8.2%, Nb is 0.02%-0.05%, Ni+Co is 14.0%‑16.0%, Fe is 0.01%‑0.02%, Mg is 0.01%‑0.15%, the rest is Cu, and Co accounts for 0%‑5.0% of the total mass of Ni+Co. The preparation method includes batching, smelting, homogenization treatment, forging, aging treatment and grinding steps. The hardness of the bar of the present invention is HRC≥35, and the tensile strength σ b ≥998Mpa, yield strength σ 0.2 ≥950Mpa, elongation δ≥6%, good uniformity of chemical composition of the bar, short production process and low manufacturing cost.

The invention discloses a method for preparing a TiAl alloy turbine blade. The method comprises: 1. establishing a three-dimensional model of the turbine blade, performing slicing processing, and obtaining sliced ​​layer data; , and then preheat the forming substrate; 3. lay the TiAl alloy powder on the preheated forming substrate, and then preheat; 4. perform selective melting scanning on the preheated TiAl alloy powder to form a single-layer solid sheet 5. Steps 3 and 4 are repeated to form electron beam selective melting moldings; 6. TiAl alloy turbine blades are obtained after cooling. The method adopts the electron beam selective area rapid prototyping method to prepare TiAl alloy turbine blades. By preheating the forming substrate and TiAl alloy powder, the forming temperature of TiAl alloy turbine blades is controlled, which reduces the internal thermal stress of TiAl alloy turbine blades and avoids the The deformation and fracture of alloy turbine blades enhance the matching of strength and plasticity of TiAl alloy turbine blades.

The invention relates to a metal smelting method. The metal smelting method comprises the steps that inert gas is continuously fed into molten metal, and parameters of the fed inert gas are adjusted according to various stages of the molten metal so that the molten metal can be located in a continuously-stirred state; and in the upward floating process of micro-bubbles of the inert gas, H and oxide generated in the molten metal are absorbed and entrained out, and escape from the surface of the molten metal, and the purpose of refining the molten metal is achieved. Compared with a conventionalrefining agent method, the metal smelting method has the advantages that the degassing rate is higher, and the slag removal effect is better. In addition, the metal smelting method does not cause thepollution such as exhaust gas / dust containing chlorine and fluorine, is beneficial to environmental protection and reduces the environmental protection cost. By the adoption of the metal smelting method, a furnace door does not need to be opened repeatedly, the contact between the molten metal and the air is reduced, and the metal oxidation burning loss and the energy consumption are reduced. Themetal smelting method further has the technical effects that the temperature field effect and the gravity field effect can be effectively overcome, and the microsegregation of alloy elements is reduced. The invention further relates to a smelting furnace matched with the metal smelting method.

The invention relates to a preparing method for obtaining a complex precise fine grain casting. The preparing method comprises the steps that firstly, melt overheating treatment is conducted; secondly, melt obtained in the first step is cooled to 1,410 DEG C, and the cooling rate ranges from 1.2 DEG C / min to 2 DEG C / min; thirdly, the melt obtained after cooling in the second step is subjected to heat preservation for T hours; thirdly, the melt obtained in the third step is poured into a die shell with the preheating temperature of 1,400 DEG C along a pouring cup under the heating condition that an electromagnetic field serves as a power source; and fifthly, a water cooling copper disc at the lower portion of the die shell is started, the die shell rotates along with the lower water cooling copper disc, the water cooling copper disc integrally moves downwards under connection of a rotation screw, the rotation angular speed ranges from 150 degrees / s to 360 degrees / s, the melt in the die shell downwards moves along with the die shell, after part of the die shell moves out of a heating power source, the temperature of the melt in the die shell is reduced, the metal is crystallized, finally, the melt in the die shell moves and is condensed at the same time along with the water cooling tray, and the complex precise fine grain casting is obtained.