32results about How to "Toughness does not decrease" patented technology

The invention provides a deep-cooling surface-layer continuous-rolling preparation method for a gradient strip. Grains in the surface-layer area are promoted to be refined through plastic deformation of the surface layer of a material, and meanwhile, recrystallization of ultra-fine grains in the plastic deformation process is restrained through ultralow-temperature deformation, so that a nano-structure is formed on the surface of the material; through multi-pass deep-cooling surface-layer rolling, the strip of a gradient structure is formed through a rolled piece, the surface layer of the material is of an ultra-fine grain structure, and coarse grains are located on the central area of the material; and compared with a material which is prepared through traditional cold rolling, the strength of the material is greatly improved under the condition that the material has better plasticity. Compared with the prior art that deep-cooling surface-layer rolling is only suitable for pure aluminum and aluminum alloy materials currently, through the technique, the tenacity of the material is hardly reduced, and the strength of the material can be improved by 30% or over.

The invention relates to medium-carbon alloy cast steel shots and a manufacturing method thereof. Each medium-carbon alloy cast steel shot comprises the following chemical components in percentage by mass: 0.35 to 0.45 percent of carbon, 0 to 0.2 silicon, 0.45 to 0.5 percent of manganese, 0.8 to 1.2 percent of chrome, 0 to 0.015 percent of sulfur, 0 to 0.020 percent of phosphor and the balance of iron and inevitable impurities. The manufacturing process comprises the following steps of: mixing and smelting, namely, smelting the raw material composition mixed proportionally into liquid steel, pouring the liquid steel into a tundish and performing deoxygenation by adopting an deoxidant; preparing shots by a centrifugally forming method, namely, pouring deoxygenized liquid steel into a centrifugal disc which rotates at a high speed, throwing out the liquid steel under the action of a centrifugal force to make the liquid steel fall into a cooling water pool, and taking the liquid steel out and drying the cooled steel to obtain formed cast steel shots; and performing heat treatment, namely, heating the formed cast steel shots until the temperature reaches 860 to 880 DEG C, performing cold quenching after keeping the temperature for 20 to 40 minutes, tempering for 40 to 80 minutes at the temperature of between 350 and 500 DEG C, and after tempering, cooling rapidly by a steel plate vibrating screen water cooling method to produce the medium-carbon alloy cast steel shots. The medium-carbon alloy cast steel shots and the manufacturing method thereof have the advantages of guaranteeing the high rigidity of the steel shots, avoiding crack generated in the centrifugally forming process and the heating tempering process, improving the toughness and the like.

The invention discloses a high-alloy tool steel plate and a production method thereof. The steel plate is prepared from the chemical components in percentage by mass: 0.5 to 0.6 percent of C, 0.15 to0.35 percent of Si, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, 1.5 to 1.8 percent of Mn, 0.25 to 0.35 percent of Mo, 0.07 to 0.12 percent of V, and the balanceFe and inevitable impurities. The production method comprises the processes of heating, rolling and heat-treating. According to the high-alloy tool steel plate and the production method thereof provided by the invention, by adopting the composition design without Cr and Ni adding and with low Mo, and through optimizing the heat treatment process, the performance of the steel plate is ensured, theimpact toughness is improved, and a greater benefit is brought for the manufacturing and using departments; and the produced high-alloy tool steel plate has favorable mechanical property and processability, has an excellent pressure casting performance, and meets the production needs of large die molds requiring high hardness such as pressure casting dies, supporting tools and die holders.

A PBT heat-conducting and heat-resistant material for LED lamp holders and a preparation method thereof, relating to a heat-resistant plastic material and a preparation method thereof, the heat-conducting and heat-resistant PBT mainly consists of a resin matrix, a reinforcement system, a heat conduction system, and a lubrication system , Composition of antioxidant system. Among them, the resin matrix is ​​PBT; the reinforcement system is glass fiber; the lubrication system is TAF lubricant and calcium stearate; the antioxidant system is antioxidant 1010. The thermally conductive and heat-resistant PBT material prepared by the present invention uses glass fiber as a reinforcing skeleton, uses ethylene-methyl acrylate-glycidyl methacrylate terpolymer (E-MA-GMA) as a compatibilizer, and is filled with AlN. The thermal conductivity factor maintains good strength and toughness while ensuring the high thermal conductivity of the PBT material. At the same time, the advantages of PBT plastics such as easy processing and low mass production cost can make the thermal conductive plastic used in LED lamp holders and other related fields.

The invention belongs to the technical field of alloy materials, and particularly relates to a high-strength and high-toughness aluminum alloy wheel die forging and a preparation method thereof. The high-strength and high-toughness aluminum alloy wheel die forging is composed of the following elements in percentage by mass: 0.78 percent to 0.84 percent of Si, 1.18 percent to 1.24 percent of Mg, 0.38 percent to 0.42 percent of Cu, 0.20 percent to 0.25 percent of Fe, 0.12 percent to 0.15 percent of Mn, 0.23 percent to 0.26 percent of Cr, 0.01 percent to 0.05 percent of Ti, 0.01 percent to 0.03 percent of Sc and the balance Al. According to the high-strength and high-toughness aluminum alloy wheel die forging and the preparation method thereof provided by the invention, by optimizing alloy components, assisting in adding silicon nitride powder and adopting the optimized aluminum bar heating process, solid solution process and aging process after die forging, the comprehensive performancerequirement of the aluminum alloy die forging is met, and the prepared aluminum alloy die forging is good in surface quality, good in performance of finished forgings in industrial production and excellent in comprehensive mechanical property.

The invention relates to a method for improving properties of H13 die steel by adding nitrogen and belongs to the field of metal materials. In the method, chemical compositions of conventional H13 steel are improved, the strength, hardness and abrasive resistance of the die steel are improved by adding solid solution nitrogen element, and the toughness is not reduced. The nitrogen element is added by a method of adding a chromium nitride preliminary alloy, and other elements are added by a conventional method. In order to ensure yield of the nitrogen element during smelting, and reduce overflowing in the process of smelting and air bubbles during solidification, a smelting temperature is strictly controlled to be higher than a melting point within 50 DEG C, and the casting is quickly performed after the alloys completely smelt. The nitrogenous H13 die steel comprises the following chemical compositions by percentage: 0.28 to 0.40 percent of carbon, 0.8 to 1.2 percent of silicon, 0.2 to 0.5 percent of manganese, 4.75 to 5.5 percent of chromium, 1.10 to 1.75 percent of molybdenum, 0.8 to 1.2 percent of vanadium, 0.02 to 0.08 percent of nitrogen, less than or equal to 0.03 percent ofphosphorus, less than or equal to 0.03 percent of sulfur and the balance of Fe. A forge piece after thermal treatment has the following properties: the hardness value is 53 to 55HRC, the tensile strength is over 1,800MPa, the yield strength is over 1,480MPa, the impact absorption power value is between 15 and 16 J, the strength and hardness are higher than those of the H13 steel, and the toughness is not lower than that of the H13 steel.

The invention discloses an anti-carburizing construction process for casting a cooling water pipe in a blast furnace cooling wall, belonging to the technical field of the preparation of the metallurgical machinery. The invention provides an anti-carburizing construction process for casting the cooling water pipe in the blast furnace cooling wall without carburizing on the outer surface of the cooling water pipe and forming a carburizing layer. The anti-carburizing construction process comprises the following steps: bending the cooling water pipe, and derusting the bended cooling water pipe; then spraying an Al2O3 layer of which thickness is no more than 0.10-0.15mm on the outer surface of the cooling water pipe; then painting a water-based zircon powder paint layer of which thickness is no more than 0.2mm on the outer surface of the qualifiedly sprayed cooling water pipe, and drying; and finally embedding the cooling water pipe in a casting mould cavity, assembling the mould and casting the cooling wall, wherein the Al2O3 coating is directly formed through the chemical combination of the molten Al wire and oxygen in air during the spraying process.

The invention discloses a PBT heat conducting and heat resisting material for an LED lamp holder and a preparation method of the PBT heat conducting and heat resisting material and relates to a heat resisting plastic material and a preparation method thereof. The heat conducting and heat resisting PBT mainly comprises a resin matrix, a reinforcing system, a heat conducting system, a lubricating system and an antioxidant system; the resin matrix is PBT; the reinforcing system is glass fibers; the lubricating system comprises a TAF lubricant and calcium stearate; the antioxidant system is an antioxidant 1010. According to the heat conducting and heat resisting PBT material prepared by the preparation method disclosed by the invention, the glass fibers are used as a reinforcing framework, anethylene-methyl acrylate-glycidyl methacrylate (E-MA-GMA) terpolymer is used as a compatibilizer, and AIN is filled as a heat conducting factor; better strength and toughness are kept under the condition of ensuring high heat conductivity of the PBT material; meanwhile, the PBT plastic has the advantages of easiness in processing, batch production, low cost and the like, so that the heat conducting plastic is applied to the related fields of LED lamp holders and the like.

The invention discloses a composite membrane reinforced by an inclusion complex of ring molecules and a polymer. The composite membrane is mainly formed by a polymer layer consisting of a linear polymer or a branch polymer and an inclusion complex layer formed by serially sleeving the ring molecules on partial chain links of the polymer which are compounded and accumulated layer by layer. The preparation of the composite membrane mainly comprises the following steps: a polymer component and a ring molecule component are dissolved into a solvent respectively to be prepared into a solution; anda substrate material is alternately immersed into the solution prepared by the polymer component and the ring molecule component, is kept stand for a period of time, and is taken out to remove excessive adhesive substances, and a multi-layer membrane system can be obtained by circulating the process. Compared with the prior art, a supermolecular multi-layer membrane greatly strengthens the mechanical property and the friction-resistant performance of the multi-layer membrane by introducing a self-assembling inclusion component of the polymer and the ring molecules, and has broad varieties of selectable polymers and broad application prospect.

The invention discloses a Ni-Mo steel plate for low-temperature high-toughness X100 pipe fittings. The chemical composition of the steel plate is C: 0.09-0.12%, Mn: 1.5-1.9%, Si: 0.1-0.3%, and S: ≤0.003%, P: ≤0.015%, Nb: 0.04~0.065%, Ti: 0.008~0.03%, V: 0.02~0.10%, Alt: ≤0.06%, N:≤0.010%, O: ≤0.006%, Mo : 0.40~0.50%, Cu: ≤0.35%, Ni: 0.51~0.65%, Cr: ≤0.35%, Ca: ≤0.01%, and the rest is Fe. The manufacturing process includes molten steel smelting-external refining-slab reheating-TMCP process-quenching and tempering heat treatment. The finished product has high strength and high low-temperature toughness, which matches the welding of X100 main pipeline. The process window improves the yield and qualification rate of steel products.

The invention relates to the technical field of cylinder liner processing, in particular to a method for preparing a mud pump cylinder liner. Step 1: Roughly process the cylinder liner liner; Step 2: Perform heat treatment on the rough-processed cylinder liner liner; Step 3 1. Process and polish the cylinder liner liner after the magnetic field heat treatment in step 2; step 4, heat the cylinder liner coat to 400-500°C and install and machine the polished cylinder liner liner to obtain the mud pump cylinder liner. The surface hardness and wear resistance of the liner prepared by the present invention are improved, and the hardness of the bimetallic cylinder liner is increased from the existing 58-61HRC to 63-64HRC. At the same time, the toughness and other mechanical properties of the cylinder liner prepared by the present invention are improved. .

The invention discloses a low-alloy steel plate and a heat treatment method for the steel plate. The strong-strength low-alloy steel plate comprises the following chemical components in percentage by weight: 0.12 to 0.20 percent of C, 0.20 to 0.60 percent of Si, 1.20 to 1.80 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.030 percent of S, 0.020 to 0.080 percent of Nb, less than or equal to 0.050 percent of V, 0.010 to 0.060 percent of Ti, 0.015 to 0.045 percent of Al and the balance of Fe and trace impurities. According to the low-alloy steel plate and the heat treatment method for the steel plate, the strength loss of the steel plate after heat treatment can be effectively reduced, the yield strength and the tensile strength of the steel plate are strengthened by more than 30MPa compared with those of a conventional normalized steel plate, the alloy element content of the normalized steel plate can be effectively reduced, and the production cost is lowered.

The invention discloses a cutting tool which utilizes laser cladding technology to strengthen the cutting edge. Including the cutter body and the handle body, the cutting edge line position of the cutter body is clad with a layer of cladding layer formed by wear-resistant cemented carbide mixed powder, and the cemented carbide mixed powder is composed of nickel-based alloy powder and tungsten carbide powder The mass percentage of nickel-based alloy powder is 40%-70%, and the mass percentage of tungsten carbide powder is 30%-60%. The nickel-based alloy powder is composed of Cr: 18%-23%, Fe : 4%~7%, Nb: 2%~4.5%, Mo: 8%~11.5%, Al: 0.2%~0.4%, Ti: 1%~2.5%, C: 0.1%~0.6%, Si: 0.2 %~0.5%, Mn: 0.2%~0.6%, V: 1.5%~2.5%, the balance is Ni. The advantages of the present invention are that the cladding layer and the cutter body achieve good metallurgical bonding, the cladding layer structure is fine and uniform, and the dilution rate is low; after the cutter body is sharpened, the hardness, sharpness, corrosion resistance and wear resistance of the blade are improved. Both have been greatly improved, the cost is low, and the toughness will not be reduced while increasing the hardness of the blade.

The invention belongs to the technical field of alloy materials, and in particular relates to a high-strength and high-toughness aluminum alloy wheel die forging and a preparation method thereof. The high-strength and high-toughness aluminum alloy wheel die forging is composed of the following elements by mass percentage: Si: 0.78-0.84%, Mg: 1.18%-1.24%, Cu: 0.38%-0.42%, Fe: 0.20%-0.25%, Mn: 0.12% to 0.15%, Cr: 0.23% to 0.26%, Ti: 0.01% to 0.05%, Sc: 0.01% to 0.03%, and the balance Al. The present invention optimizes the alloy composition, assists in adding silicon nitride powder, and adopts optimized aluminum rod heating process, solid solution and aging process after die forging to meet the comprehensive performance requirements of aluminum alloy die forgings, and the prepared aluminum alloy die forgings The surface quality is good, the performance of finished forgings in industrial production is good, and the comprehensive mechanical properties are excellent.

The invention provides a deep-cooling surface-layer continuous-rolling preparation method for a gradient strip. Grains in the surface-layer area are promoted to be refined through plastic deformation of the surface layer of a material, and meanwhile, recrystallization of ultra-fine grains in the plastic deformation process is restrained through ultralow-temperature deformation, so that a nano-structure is formed on the surface of the material; through multi-pass deep-cooling surface-layer rolling, the strip of a gradient structure is formed through a rolled piece, the surface layer of the material is of an ultra-fine grain structure, and coarse grains are located on the central area of the material; and compared with a material which is prepared through traditional cold rolling, the strength of the material is greatly improved under the condition that the material has better plasticity. Compared with the prior art that deep-cooling surface-layer rolling is only suitable for pure aluminum and aluminum alloy materials currently, through the technique, the tenacity of the material is hardly reduced, and the strength of the material can be improved by 30% or over.

The invention discloses an aging treatment method for a cobalt-based alloy wire. The aging treatment method comprises the following steps that 1, a heating furnace containing sand with the grain size smaller than 500 micrometers is heated to the needed aging temperature; and 2, the cobalt-based alloy wire machined to the needed diameter is inserted into the sand in the first step to be subjected to heat preservation for the needed aging duration. According to the aging treatment method, it is guaranteed that the heating temperature of the cobalt-based alloy wire is constant, the cobalt-based alloy wire can be prevented from being in direct contact with air, and oxidization is avoided; the temperature is rapidly increased to the aging temperature, the heat preservation time is shortened, and therefore defect elimination and atom segregation can be facilitated; meanwhile, coarse grains can be avoided, and it is guaranteed that the toughness of the cobalt-based alloy wire is not reduced while the strength of the cobalt-based alloy wire is improved; the problem that strict sealing performance, operation complexity, the vacuum pumping and releasing long-time characteristic and the like are required under the vacuum heating condition can be avoided, operation is convenient, and high efficiency is achieved; and the problem of the uneven structure of the cobalt-based alloy wire is solved, and the aging treatment method can be widely applied to coil heat treatment.