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4042results about How to "Improve impact toughness" patented technology

Centrifugal casting high-speed steel composite roll and manufacture method thereof

The invention relates to a centrifugal casting high-speed steel composite roll and a manufacture method thereof and belongs to the field of casting. The composite roll is composed of outer layer high-speed steel, middle layer graphitic steel and core high-strength nodular cast iron by centrifugal compounding. The centrifugal casting high-speed steel composite roll is based on the conventional high-carbon high-vanadium high-speed steel roll, the content of vanadium is appropriately reduced, niobium is added at the same time, and the Nb / V is controlled to be 0.3 to 0.5 so that Nb and V form complex carbide (V, Nb) C so as to avoid forming segregation under the action of centrifugal force. A roll core of the high-speed steel composite roll adopts high-strength nodular cast iron, and a multivariate graphite steel middle layer is poured between an outer layer and the roll core for preventing interfusing elements of Cr, B, and the like which cause embrittlement when the nodular cast iron is poured to be fused with the outer layer high-speed steel. Microalloying processing for refining the organization is carried out on a roll surface high-speed steel material and the middle layer graphitic steel so as to achieve the purpose of improving the thermal cracking capacity of the roll material. The centrifugal casting high-speed steel composite roll has high overall performance, long service life and good economic benefits.
Owner:BEIJING UNIV OF TECH

Manufacturing method of multilayer shell-core composite structural part

The invention discloses a manufacturing method of a multilayer shell-core composite structural part, which comprises the following steps of: (1) respectively preparing feed for injection forming of a core layer, a transition layer and a shell layer, wherein powder in the feed of the core layer and the powder in the feed of the shell layer are selected from one or a mixture of some of metal powder, ceramic powder, or toughened ceramic powder and are different from each other, and the powder in the feed of the transition layer is gradient composite powder; (2) respectively manufacturing blanks of the multilayer shell-core composite structural part layer by layer with a powder injection forming method; (3) degreasing the blanks; and (4) sintering the blanks to obtain the multilayer shell-core composite structural part. The multilayer shell-core composite structural part is manufactured with the powder injection forming method, and has the advantages of high surface hardness, abrasion resistance, uniform thickness of the shell layer, stable and persistent performance, strong binding force between the shell layer and the core layer due to the transition layer, good integral bending strength and good impact toughness and is difficult to crack.
Owner:SUZHOU DINGAN ELECTRONICS TECH

High strength bainitic steel rail and heat treatment process thereof

The invention provides a high strength bainitic steel rail and a heat treatment process thereof. The steel rail comprises the following chemical compositions by weight percentage: 0.10%-0.32% of C, 0.80%-2.00% of Si, 0.80%-2.80% of Mn, Cr less than 1.50%, 0.10%-0.40% of Mo, 0-0.5% of Ni, wherein Mn, Cr and Ni satisfy the relation of: Mn+Cr+0.5Ni<=2.8%, and the balance of Fe and unavoidable impurities. The process is as below: conducting hot rolling on the steel rail or air cooling on the steel rail to room temperature, then reheating to 850-1000 DEG C for austenization; cooling the steel rail head to 620-570 DEG C with a cooling rate of 0.3-15 DEG C / s; when the temperature is lower than 620-570 DEG C, cooling to 350-200 DEG C with a cooling rate of 0.5-5 DEG C / s; and then conducting air cooling to room temperature. The invention avoids generation of excessive unstable thick M-A islands in granular bainite during air cooling to room temperature in hot rolling, reduces the risk of straightening fracture (or delayed fracture)of hot-rolled steel rail, and improves the adaptability of steel production process. The steel rail has tensile strength higher than 1400MPa, and realizes optimum matching of strength, toughness and ductility, and excellent rolling contact fatigue resistance and wear resistance.
Owner:ANGANG STEEL CO LTD

High-performance polyimide molding powder material suitable for 3D printing and 3D printing molding method

The invention discloses a polyimide powder composite material for 3D printing which includes a powder material and an adhesive. The powder material comprises, by weight, 100 parts of polyimide molding powder, 0.5-1 part of a thermal stabilizer and 5-10 parts of a reinforcing agent. The adhesive comprises, by weight, 60-80 parts of main sticky material, 5-20 parts of a pigment, 5-20 parts of filler, 2-10 parts of a flexibilizer, 0.5-1.5 part of a levelling agent and 1-10 parts of a pigment-and-filler dispersing and wetting agent. The powder composite material is used in a manner of matching 1 part by weight of the powder material with 0.1-0.5 parts by weight of the adhesive. The powder composite material broadens a selectable range of present 3D printing materials. The high-performance polyimide molding powder is used as a powder layer of 3D printing and a liquid adhesive is sprayed onto the powder layer to produce a product in a layer-by-layer bonding manner. With addition of the pigment to the adhesive, a full-color prototype product can be produced and a color model can express more useful information. A polyimide product, which is produced through a powder-adhesive 3D printing technology, is excellent in high temperature resistance performance and is high in mechanical strength.
Owner:INST OF CHEM CHINESE ACAD OF SCI

Nylon engineering plastics for high-speed transit railway track and manufacture method thereof

The invention relates to nylon engineering plastics and a manufacture method thereof, in particular to nylon engineering plastics for high-speed transit railway tracks and a manufacture method thereof. The nylon engineering plastics comprise the following components in percentage by weight: 35 to 60 percent of nylon resin, 20 to 35 percent of glass fibre, 0 to 10 percent of inorganic mineral, 16 to 30 percent of compatilizer, 0.3 to 0.5 percent of light stabilizer, 0.1 to 0.3 percent of coupling agent, 0.1 to 0.5 percent of antioxygen and 0.4 to 1 percent of lubricant, wherein the compatilizer is one kind of or a mixture of two kinds of Maleic anhydride grafted EPDM (Ethylene Propylene Diene Monomer) rubber and maleic anhydride grafted POE (Polyolefin Elastomer), and the melt flow rate of the compatilizer is 0.5 to 1.5g/10min. The manufacture method comprises the steps of: adding the compatilizer into an extruder in a lateral feeding addition method under the condition that the melt temperature is 220 to 280 DEG C and the mixing time is 1-5min; and controlling the rotate speed of a screw between 300 and 450rpm. According to the invention, the tensile strength, the impact toughness and the size stability can all meet the requirements for the operation of high-speed trains with running speed more than 300km/h.
Owner:NANJING JULONG SCI&TECH CO LTD

High-ground stress quasi-3D visible model testing bench frame apparatus

The invention discloses a test bench device of quasi three-dimensional visualization models with high geostress and comprises a reaction wall device, a door-typed reaction frame is arranged in the side periphery of the reaction wall device, a hydraulic loading device is arranged between the door-typed reaction frame and a model body, and a plurality of observing windows are arranged surrounding the position of a perforated chamber on the reaction wall device. The test bench device can be used for implementing the experimental research on the geomechanical plane strain models in the stability research of underground engineered tunnels under high geostress condition. The test bench device has the following advantages: 1. a steel frame of the model adopts a high-intensity alloy steel material, thus having good intensity, rigidity and toughness, strong corrosion resistant capacity, and repeated and recycled use in a long time; 2. an external loading method is adopted, thus conveniently realizing jobs such as the installation and the replacing of loading equipment such as hydrostatic triggers, etc.; 3. a toughened glass is arranged surrounding a hole of the reaction wall, thus being convenient for observing the deformation and the crack propagation situation in the surrounding of the hole; 4. an assorted control system of hydraulic loading is combined, thus conveniently realizing graded loading and simulating real geostress distribution situation as accurately as possible.
Owner:SHANDONG UNIV

Method for adding rare earth metal into steel to improve performance

The invention relates to the field of manufacturing of high-quality metal materials, in particular to a method for adding rare earth metal into steel to improve the performance. In the smelting process of molten steel, the degree of purity of the molten steel and the degree of purity of the high-purity rare earth metal are strictly controlled; the high-purity rare earth metal is added into a steel ladle; the content of sulfur in the molten steel is below 200 ppm and the total oxygen content is below 40 ppm before the high-purity rare earth metal is added; and the total oxygen content of the added high-purity rare earth metal is below 200 ppm. The method is applicable to the processes such as a converter BOF-ladle refining LF-vacuum degassing RH or VD-continuous casting CC / mold casting MC flow, an electric arc furnace EAF-ladle refining LF-vacuum degassing RH or VD-continuous casting CC / mold casting MC flow and a converter BOF / intermediate frequency furnace GOR / AOD(-ladle refining LF)-continuous casting CC / mold casting MC flow, prepares high-quality carbon structural steel, low alloy steel, medium-high alloy steel, tool and mould steel, bearing steel, spring steel, stainless steel and electrical steel, and solves the bottleneck problems that due to a conventional rare earth adding process, the performance of rolled steel is not stable and a water gap is blocked in the production process.
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI

High-performance bridge weathering steel containing Mo and preparation method thereof

The invention belongs to the field of manufacture of low-alloy steel, in particular to high-performance bridge weathering steel containing Mo and a preparation method thereof. The invention provides bridge weathering steel containing Mo with the high performance, which comprises the following chemical components by mass percent: 0.02-0.05 percent of C, 0.20-0.30 percent of Si, 1.0-1.50 percent of Mn, at most 0.02 percent of P, at most 0.010 percent of S, 0.20-0.40 percent of Cu, 0.40-0.60 percent of Cr, 0.20-0.40 percent of Ni, 0.1-0.30 percent of Mo, 0.04-0.07 percent of Nb, 0.005-0.015 percent of Ti, at most 0.02 percent of Al and the balance of Fe and inevitable impurities. The high-performance bridge weathering steel containing Mo adopts two stages of rolling. The rough rolling and bloom rolling temperature of the first stage is 1050-1070 DEG C, the precision rolling and bloom rolling temperature of the second stage is 900-950 DEG C, and the finish rolling temperature is 800-850 DEG C. The high-performance bridge weathering steel containing Mo disclosed by the invention has good mechanical property, welding performance and atmospheric-corrosion resistance performance. The high-performance bridge weathering steel containing Mo adopts an Ultra-low carbon design, and the production cost is low.
Owner:NORTHEASTERN UNIV LIAONING +1

Low-cost steel plate for building structure and manufacturing method thereof

The invention discloses a low-cost steel plate for a building structure and a manufacturing method thereof. The steel plate comprises the following chemical components: C accounts for 0.14 percent to 0.17 percent, Si accounts for 0.20 percent to 0.50 percent, Mn accounts for 1.30 percent to 1.50 percent, P is equal to or less than 0.012 percent, S is equal to or less than 0.005 percent, Alt accounts for 0.020 percent to 0.060 percent, and the balances are Fe and unavoidable foreign impurities. (1) No noble metal elements such as Nb, V, Ti, Ni, Cr, Mo and the like, are added in the steel, the requirement of Q345GJ strength level is met completely though the chemical components C-Si-Mn-Al, and the cost is low; (2) the steel is purer, P is equal to or less than 0.012 percent, and S is equal to or less than 0.005 percent; (3) the impact toughness is good at the temperature of minus 40 DEG C, and the Charpy impact energy of a V-shaped notch is equal to or higher than 80 J; (4) the earthquake resistance is good, and the actual yield ratio is respectively smaller than 0.78; and (5) the lamellar tearing resistance is excellent, and the actual Z-direction section shrinkage ratio in the total-thickness direction is equal to or higher than 38 percent. The hot-rolling Q345GJEZ35 steel plate used for the building structure and provided with thickness of 20-90 mm can be produced, and the steel plate and the manufacturing method can be applied to the manufacture of the steel structure of the high-rise building, have good comprehensive performance and simple production process, can realize the batch production and have low cost.
Owner:SHOUGANG CORPORATION

High-strength-and-toughness low alloy wear resistant steel and manufacturing method thereof

The invention relates to high-strength-and-toughness low alloy wear resistant steel and a manufacturing method thereof, belonging to the technical filed of metallurgy. The high-strength-and-toughness low alloy wear resistant steel comprises the following components by weight percent: 0.15-0.20% of C, 0.1-0.5% of Si, 1.2-1.6% of Mn, less than or equal to 0.015% of P, less than or equal of 0.005% S, 0.02-0.04% of Al, 0.016-0.022% of Ti, 0.16-0.20% of Cr, 0.16-0.22% of Mo, 0.001-0.0015% of B and the balance of Fe, and simultaneously the carbon equivalent Ceq (%) is less than or equal to 0.55. The manufacturing method comprises the following steps: smelting molten steel and pouring into a slab, and carrying out rough rolling after heating and heat insulation; and then carrying out complete quenching treatment, or sub-temperature quenching treatment, or carrying out the complete quenching treatment and then carrying out the sub-temperature quenching treatment, and adopting low temperature tempering to eliminate stress after the quenching. The method of the invention ensures higher hardness, simultaneously can obviously improve the impact toughness of steel plates, increase the impact resistance of the steel plates, and prolong the service life of mechanical equipment, and can obtain wear resistant steel plates with different strength and toughness grades by using the steel with same components and different quenching processing methods.
Owner:NORTHEASTERN UNIV +1

Method for improving low-temperature impact toughness of high strength thick steel plate

The invention discloses a production method for improving the low-temperature impact toughness of a high strength thick steel plate, and belongs to the technical field of medium and thick steel plate production. The steel comprises the following chemical compositions: 0.05 to 0.15 percent of C, 0.15 to 0.40 percent of Si, 0.90 to 1.60 percent of Mn, less than 0.01 percent of P, less than 0.01 percent of S, 0.10 to 0.80 percent of Ni, 0.1 to 0.5 percent of Mo, 0.0008 to 0.0015 percent of B, 0.01 to 0.06 percent of microalloy element Nb, 0.01 to 0.07 percent of V, 0.01 to 0.03 percent of Ti and the balance of Fe; the thick steel plate is produced by soft reduction technology in a continuous casting process under the condition that a compression ratio is less than 4.0; and by a heat treatment process which comprises the steps of quenching, quenching and tempering, the texture of the steel plate after double quenching is controlled to be a hybrid texture with a hard phase and a soft phase, and the requirements on steel plate strength and low-temperature toughness are met at the same time. Under a small compression ratio, the thick steel plate has the performance equivalent to that of a thin steel plate by the combination of the heat treatment process and texture control; and compared with the methods such as die casting, forging and the like, the method is simple and feasible, and has high yield and low production cost.
Owner:SHOUGANG CORPORATION
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