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54results about How to "Improve comprehensive mechanical properties" patented technology

Method for continuously casting titanium alloy near single-crystal ingot by using electromagnetic cold crucible

A method of continuously founding the titanium alloy to be close to an single crystal ingot with a magnetic field belongs to a method of making the titanium alloy to be close to the single crystal ingot. The method solves the problem that the container material is easy to pollute the alloy and thus affect the physical and mechanical performances of the single crystal alloy during preparation of single crystal in the current directional solidification methods. The procedures of the invention are as follows: 1. vacuum pumping is conducted in a furnace (4), and then argon is re-charged. 2. induction coils (3) are arranged out of a water-cooled copper crucible (2), and spread on the outer surface of the water-cooled copper crucible (2). 3. a material rod (3) enters into the induction coils (3), the titanium alloy charge enters into the cavity of the water-cooled copper crucible (2), and the diameter of the upper part of the charge is small. 4. After heating, pulling is conducted, the feeding speed must strictly match with the pulling action; a rod enters into a crystallizer (9); the material rod forms close single crystal after pulling, and obtains the single crystal ingot after processing the outer layer. The invention realizes high-grade, high-efficiency, safety, special and low-cost single crystal preparation method for the titanium alloy material.
Owner:HARBIN INST OF TECH

Coextrusion processing method of magnesium alloy

The invention discloses a coextrusion processing method of a magnesium alloy. According to the method, a coextrusion mould is adopted, wherein the coextrusion mould comprises an upper end vertical extrusion channel. The method comprises the following steps of: step one, carrying out homogenization treatment on a magnesium alloy casting blank material; step two, heating the coextrusion mould, wherein the temperature of the coextrusion mould is 10 DEG C-30 DEG C lower than that of the magnesium alloy blank material, and a lubricating agent is uniformly coated on extrusion channel of the coextrusion mould after being heated; and step three, heating the magnesium alloy blank material subjected to homogenization treatment to 250 DEG C-400 DEG C, carrying out one-way uniform speed extrusion from the upper end of the magnesium alloy blank material so as to ensure that the magnesium alloy blank material flows and is subjected to compressional deformation towards an S type channel from the vertical channel. According to the coextrusion processing method provided by the invention, the coextrusion deformation technology is adopted, thus refinement effect of magnesium alloy grains is greatly improved, the comprehensive mechanical property of a magnesium alloy material is improved, and heat treatment gate and a complicated compressional deformation working procedure in the compressional deformation process are reduced.
Owner:NO 59 RES INST OF CHINA ORDNANCE IND

Production method of X70 hot-rolled medium plate for submerged pipeline

ActiveCN102181796AImprove transverse and longitudinal strength and low temperature toughnessImprove comprehensive mechanical propertiesSteel platesAlloy element
The invention provides a production method of an X70 hot-rolled medium plate for a submerged pipeline. The medium plate comprises the following components in percentage by weight: 0.035 to 0.07 percent of C, 0.10 to 0.35 percent of Si, 1.40 to 1.85 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.0035 percent of S, 0.01 to 0.06 percent of Alt, 0.035 to 0.07 percent of Nb, 0.008 to 0.020 percent of Ti, 0.10 to 0.30 percent of Mo, 0.10 to 0.25 percent of Ni, 0.10 to 0.25 percent of Cr, 0.10 to 0.25 percent of Cu and the balance of Fe and inevitable impurity elements. In the steel plate manufacturing process, the effects of the alloy elements and the potential of an excavation thermo-mechanical control process are fully exerted through an optimized blank type design, a strict heating schedule and a reinforced thermo-mechanical control process in coordination with an appropriate amount of Ni, Cr and Cu alloy elements, so that an organization form based on a uniform fine acicular ferrite is obtained on a steel plate with the whole wall thickness, and the medium plate has relatively high horizontal and longitudinal tensile strength and high low-temperature toughness, and completely meets the requirements of high performance of steel for a deepwater submerged pipeline.
Owner:SHOUGANG CORPORATION

Method and cooling system for improving comprehensive mechanical property of normalized steel plate

The invention discloses a method for improving the comprehensive mechanical property of a normalized steel plate. The running time of the steel plate in a heating region in a normalizing furnace is reasonably prolonged and the running time of the steel plate in a thermal insulation region in the normalizing furnace is reasonably shortened, so that the austenite grain growth is avoided to provide favorable conditions for subsequent accelerated cooling. The steel plate is quickly cooled to be 600-700 DEG C from the normalizing temperature in a way of normalizing, atomizing and cooling, so that the mist cooling with higher heat exchange efficiency increases the supercooling degree of the structural transformation of the steel plate and effectively prevents the austenite grain growth; and grains are refined, so that the effect of improving the strength by structure refinement in the heat treatment process of the steel plate is given full play. The invention further provides a cooling system for improving the comprehensive mechanical property of the normalized steel plate. Therefore, the equipment is simple, the investment is low, the surface quality of the steel plate can be improved, and the practicality is better.
Owner:WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD

Novel Mg-Y-Nd-(La+Ce)-Zr biodegradable magnesium alloy and manufacturing method thereof

The invention discloses an Mg-Y-Nd-(La+Ce)-Zr biodegradable magnesium alloy and a manufacturing method thereof. The Mg-Y-Nd-(La+Ce)-Zr biodegradable magnesium alloy is characterized in that the magnesium alloy is manufactured from the following components in percentage by mass: 3.0-4.5% of Y, 2.0-3.5% of Nd, 0.3-1.0% of Zr, 0.05-0.5% of lanthanum cerium composite rare earth, and the balance beingmagnesium and inevitable impurities, wherein the impurity content is less than or equal to 0.1%, and lanthanum content and cerium content in the lanthanum cerium composite rare earth each account for50%; and the manufacturing method comprises the steps: batching, casting, annealing, extruding, and obtaining finished products. According to the magnesium alloy and the manufacturing method, a multi-element and small-amount design method is adopted, the proportion is scientific and reasonable, the manufacturing process is simple, the manufactured magnesium alloy is high in compactness, reliable in quality, excellent in mechanical property and corrosion resistance, controllable in degradation speed and excellent in biocompatibility, meanwhile, a cardiovascular stent made of the magnesium alloycannot be damaged for deformation and can be well matched with human tissues, and therefore the magnesium alloy has wide application prospects in the medical field.
Owner:CHINA WEAPON SCI ACADEMY NINGBO BRANCH

Method for optimizing track of complex revolved body and system

The invention discloses a method for optimizing a track of a complex revolved body and a system capable of realizing the method. According to the method, an initial track is generated according to a component laying angle and a material curvature requirement, then an offset track is generated by adopting equidistant offset, and the track is optimized by adopting an automatic fiber laying path optimization method adopting local adjustment and global optimization. According to the method, the variable curvature algorithm is fully utilized to generate the initial trajectory, the advantage of highefficiency of the equidistant bias algorithm is fully utilized on the basis of considering the structural design requirement and the fiber placement manufacturability requirement, the bottleneck thatthe manufacturability of the complex revolving body fiber placement trajectory is difficult to meet the design requirement is broken through, therefore, high-performance, high-efficiency and high-precision laying forming of the complex revolved body continuous fiber reinforced composite material can be achieved. Based on the optimized track, the manufacturability requirement and the structural requirement are met, and the comprehensive mechanical property of the component can be remarkably improved.
Owner:CHENGDU AIRCRAFT INDUSTRY GROUP +1

Preparation method of non-homogeneous layered-structure commercial pure titanium

The invention discloses a preparation method of non-homogeneous layered-structure commercial pure titanium, and belongs to the field of commercial pure titanium manufacturing. The method comprises thesteps that homogenized annealing treatment is conducted on the commercial pure titanium with the thickness of 10-15 mm to obtain homogeneous tissues with the average grain size of 70 microns; 80-90%of cold rolling treatment is conducted on the commercial pure titanium to form traditional belt-shaped coll-rolling tissues; incomplete recrystallization annealing cold rolling treatment is conductedon the commercial pure titanium at the temperature of 450-500 DEG C for 5-60 min to finally prepare the non-homogeneous layered-structure commercial pure titanium. Mechanical experiment results show that the commercial pure titanium with the structure has the buckling strength of 550-660 MPa and the tensile strength of 630-750 MPa, particularly the uniform elongation can be greater than or equal to 4%, and the elongation at break can be greater or equal to 15%. The non-homogeneous layered-structure commercial pure titanium has the advantages that the problem of lower commercial pure titanium strength is solved, the non-homogeneous layered-structure commercial pure titanium can be allowed to have better extendability and plasticity, and the strength and plasticity matching performance of the non-homogeneous layered-structure commercial pure titanium is improved to make industrial application production convenient.
Owner:NANJING UNIV OF SCI & TECH +1

Particle-reinforced fiber-woven composite material and preparation method thereof

The invention discloses a particle-reinforced fiber-woven composite material and a preparation method thereof, and relates to a fiber-woven composite material. A fiber cloth layer as a basic element is impregnated with particle slurry, a fiber cloth layer containing particle slurry is laminated on the fiber cloth layer containing particle slurry, impregnating and laminating are repeated to form a particle-containing fiber woven preform blank, an interface layer is deposited on the particle-containing fiber woven preform blank, and a ceramic matrix is densified in the preform blank containing the interface layer to form the particle reinforced fiber woven composite material. The method comprises the following steps of: (1) preparing impregnated particle slurry; (2) preparing a fiber woven preform containing particles; (3) preparing an interface layer; and (4) preparing a ceramic matrix to obtain the particle-reinforced fiber woven composite material. The uniformity of the particle-containing fiber woven preform can be improved, the pore defects in the preform can be reduced, the density can be improved, the material performance can be improved, the preparation steps can be simplified, the production energy consumption can be reduced, and the production efficiency can be improved.
Owner:XIAMEN UNIV

Secondary quenching treatment device and rod-shaped workpiece processing method

The invention discloses a secondary quenching treatment device and a rod-shaped workpiece processing method. The quenching treatment device comprises a primary induction heater assembly, a primary quenching assembly, a secondary induction heater assembly, a secondary quenching assembly and a transmission mechanism. In the process of processing and treating an automobile anti-collision rod, the rod-shaped workpiece can sequentially pass through the primary induction heater assembly, the primary quenching assembly, the secondary induction heater assembly and the secondary quenching assembly through the transmission mechanism, so that different heat treatments can be respectively carried out on the core layer and the surface layer of the rod-shaped workpiece section by section on the same production line to improve the comprehensive mechanical properties of the rod-shaped workpiece; and the transmission mechanism is simple in structure, convenient to assemble and efficient and stable in transmission, so that the rod-shaped workpiece can spin while advancing in the length direction of the rod-shaped workpiece and can be evenly heated and quenched while being processed and treated, andthe heat treatment quality of products can be improved.
Owner:JIMEI UNIV

Hybrid FRP (Fiber Reinforced Plastics)-steel composite bar sea sand concrete beam

The invention discloses a hybrid FRP (Fiber Reinforced Plastics)-steel composite bar sea sand concrete beam, which comprises sea sand concrete, and a plurality of upper composite bars, a plurality of lower composite bars and a plurality of hoops fixedly arranged in the sea sand concrete. The hoops are uniformly fixed and tied on the outer surfaces of the upper composite bars and the lower composite bars along length directions of the upper composite bars and the lower composite bars; the upper composite bars and the lower composite bars are respectively arranged on the upper end and the lower end of the bar sand concrete, and comprise reinforcing steel bars and FRP fiber cloth coating the outer surfaces of the reinforcing steel bars; the FRP fiber cloth of each upper composite bar is made of the same material or different materials; the FRP fiber cloth of the plurality of lower composite bars adopts at least two materials; the FRP fiber cloth is adhered with the sea sand concrete; the FRP fiber cloth of the lower composite bars comprises at least two of carbon fiber cloth, glass fiber cloth, basalt fiber cloth and aramid fiber cloth. The hybrid FRP-steel composite bar sea sand concrete beam provided by the invention has no need to desalt sea sand, and has good strength and a bearing performance.
Owner:GUANGDONG UNIV OF TECH

Multifunctional ABS composite material

The invention provides a multifunctional ABS composite material, which is characterized being composed of the following components in parts by weight: 60 to 90 parts of ABS resin, 10 parts of ABS-g-MAH, 5 to 10 parts of alkali-free chopped glass fiber, 0.5 to 1.0 part of ferroferric oxide, 2 to 3 parts of composite carbon black, 0.5 to 0.8 part of lubricant, 5 to 10 parts of phosphorus flame retardant, 5 to 10 parts of nitrogen flame retardant, 0.5 to 1.0 part of silicon synergist, 2 to 3 parts of antistatic agent, and 0.5 to 1.0 part of antioxidant 1010. The phosphorus flame retardant and nitrogen flame retardant or the phosphorus flame retardant and silicon synergist are used together to generate a synergetic effect so as to improve the flame retardant efficiency, moreover, the toxic gas released during the burning process is reduced, and the provided ABS composite material has the advantages of low smoke and toxicity. Furthermore, the ABS composite material has a good mechanical property and a good electromagnet shielding performance, and has the advantages of rapid heat radiation, high electromagnet shielding efficiency, long-lasting antistatic effect, high mechanical strength, and easiness for flow processing. The application range of the ABS composite material is enlarged.
Owner:QINGDAO BOYANDA IND TECH RES INST GENERAL PARTNERSHIP
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