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

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 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 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.