42results about How to "Improved low cycle fatigue performance" patented technology

An Fe—Ni—Cr alloy formulated to contain a strengthening phase that is able to maintain a fine grain structure during forging and high temperature processing of the alloy. The alloy contains a sufficient amount of titanium, zirconium, carbon and nitrogen so that fine titanium and zirconium carbonitride precipitates formed thereby are near their solubility limit in the alloy when molten. In the production of an article from such an alloy by thermomechanical processing, a dispersion of the fine titanium and zirconium carbonitride precipitates form during solidification of the melt and remain present during subsequent elevated processing steps to prohibit austenitic grain growth.

The invention provides an all-steel-assembled buckling restrained brace with the lateral side capable of being inspected. Welded joints at the ends of stiffening ribs are smoothed, the low-cycle fatigue performance of the brace is effectively improved, the plastic deformation capability of steel is adopted, and meanwhile the state of an inner core can be easily judged through the lateral side after a seism. The all-steel-assembled buckling restrained brace solves the problems that the deformation or damage state of the inner core cannot be conveniently evaluated rapidly after a seism, the welded joints at the ends of the stiffing ribs have quality defects, and the damaged inner core cannot be conveniently replaced. The buckling restrained brace achieves the aims that the deformation state of the inner core can be judged without detaching, and whether the inner core should be replaced or not can be rapidly evaluated after a seism; the welded joints at the ends of the stiffing ribs are processed, the middle cross section of the inner core is possibly damaged, and the low-cycle fatigue performance of the brace is improved; an assembled scheme is adopted, and the damaged inner core can be conveniently replaced. The all-steel-assembled buckling restrained brace comprises the inner core, the end stiffing ribs, two restrained face plates, gaskets, limiting grooves and high-strength bolts.

The invention discloses an in-series disc spring large deformation energy consumption beam column node, which comprises an assembly type column, an assembly type beam and a disc spring combination type damper, wherein the disc spring combination type damper consists of an energy consumption rod, a disc spring set, an internal thread sleeve, an outer sleeve, a sliding guide rod and an extrusion nut, one end of the disc spring combination type damper is fixed on the fixed plate of a surface of the assembly type beam, and the other end passes through the flange plate of the assembly type column and presses tightly the flange plate. By adjusting the pressure of the extrusion nut, tensile deformation generated by the two ends of the disc spring combination type damper can be fully supplied by the energy consumption rod under the action of small and moderate earthquakes, the other part is supplied by the compressive deformation of the disc spring set, so that the disc spring combination typedamper has better deformability, and the fatigue performance of the disc spring combination type damper is conducive to being improved.

The invention provides low-yield strength building earthquake-resistance steel, which comprises the following chemical components (in weight percentage): 0.01 to 0.05 percent of C, 0.02 percent of Si, 0.05 to 0.15 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.006 percent of S, 0.01 to 0.05 percent of Al, less than or equal to 0.005 percent of N, 0.01 to 0.10 percent of Ti, and the balance of Fe and inevitable impurity elements. The invention also provides a method for producing the earthquake-resistance steel. The earthquake-resistance steel has excellent comprehensive mechanical properties, a yield strength of 140 to 180MPa, an elongation of more than 50 percent, excellent plastic deformation capacity, excellent zero degree centigrade impact toughness, an excellent low cycle fatigue property and excellent welding performance, and is suitable to be used in building earthquake-resistance design to protect main buildings and is simple in production process, low in cost and suitable for large-scale production.

The invention discloses a dual-core visual inspection buckling restraint support. The dual-core visual inspection buckling restraint support comprises two energy consumption inner core panels, two sets of end stiffening plates, two end connecting plates, a plurality of sets of connecting positioning plates and a peripheral restraint component; the two energy consumption inner core panels are arranged in parallel in the panel thickness direction, the end stiffening plates are rectangular plates, the two opposite sides of each set of end stiffening plates are perpendicularly and fixedly connected with the parallelly-arranged energy consumption inner core panels, and the other sides of the end stiffening plates and the end sides of the energy consumption inner core panels are located in the same plane; the end connecting plates are fixedly connected with the end sides of the two energy consumption inner core panels and one sides of the end stiffening plates; and the connecting positioning plates are also rectangular plates, in the parallelly-arranged energy consumption inner core panels, the two opposite sides of the connecting positioning plates are perpendicularly and fixedly connected with the energy consumption inner core panels, and all the connecting positioning plates are located in the same plane and distributed at equal intervals.

The invention discloses a vertical type bamboo-shaped round rod energy consumption rod comprising a core part, an outer restraint part and a locating pin. The core part is composed by connecting a plurality of mutually-perpendicular energy dissipation sections, intermediate limiting sections, bamboo sections and two-end connecting sections along the longitudinal coaxial axis. The intermediate limiting sections are located in the middle of the core part. The bamboo sections and the energy dissipation sections are distributed at intervals, arranged on the two sides of the intermediate limiting sections and form a whole together with the intermediate limiting sections, and the two ends of the outer sides of the bamboo sections and the energy dissipation sections are fixedly connected with the two-end connecting sections to form the core part. The cross sections of the intermediate limiting sections, the bamboo sections and the two-end connecting sections are all circular. First holes are formed in the middles of the intermediate limiting sections in the diameter direction. The energy dissipation sections are cut and manufactured in the length direction, so that the cross sections of the energy dissipation sections are two parallel opposite sides, the other two short sides are original arc lines, under the effect of the axial tensile pressure, the energy dissipation sections of the core part enter yielding through the formed new cross section areas, while the intermediate limiting sections, the bamboo sections and the two-end connecting sections always remain elastic.

The invention discloses a manufacturing method of 100-MPa low-yield-point architectural antiseismic steel. The steel comprises the following chemical components in percentage by mass: at most 0.01% of C, at most 0.02% of Si, 0.05-0.1% of Mn, 0.01-0.06% of Al, at most 0.01% of P, at most 0.004% of S, at most 0.004% of N, 0.01-0.08% of Ti, and the balance of Fe and inevitable impurities. The method comprises the following steps: refining, continuous casting, heating, rough rolling, electromagnetic induction heating, finish rolling, laminar cooling, coiling and the like. The yield strength of the 100-MPa low-yield-point architectural antiseismic steel is up to 80-120 MPa, and the elongation percentage is greater than 50%; and the steel has the advantages of favorable plastic deformation, favorable impact toughness, lower alloy cost, practical technique, favorable weldability and favorable low cycle fatigue property.

The invention discloses an austenitic stainless steel continuous tube with low carbon and high strength and a preparation method thereof. The austenitic stainless steel continuous tube comprises the components in percentage by mass: at most 0.03% of C, at most 1.00% of Si, 4.00-8.00% of Mn, at most 0.050% of P, at most 0.005% of S, 18-20% of Cr, 3-5.0% of Ni, 1.2-3.5% of Cu, 0.20-0.30% of N, at most 0.3% of Mo and the rest Fe and unavoidable impurities. The preparation method comprises the steps of (1) manufacturing a coil plate; (2) longitudinally shearing the coil plate and lengthening a steel band; and (3) forming the steel band, using laser welding, conducting rapid cooling after welding, and thus obtaining the stainless steel continuous tube. The produced continuous tube has high strength, low cost and good corrosion resistance by optimizing the alloy content and improving the manufacturing process.

The invention discloses a modularized bamboo-shaped buckling restrained brace which comprises a core part, an outer restraining part and a structure connecting part. The core part comprises a plurality of circular energy dissipation sections and a plurality of elastic sleeves. Each circular energy dissipation section comprises a middle section and connecting sections at two ends. The core part is located inside the outer restraining part. The inner surface of the outer restraining part closely attaches to or is tangent to the outer surfaces of the elastic sleeves of the core part. One end of the structure connecting part extends into the outer restraining part, and the other end thereof extends out of the outer restraining part to be connected with a structure. The modularized bamboo-shaped buckling restrained brace has the advantages that the circular energy dissipation sections and elastic sleeves of the modularized bamboo-shaped buckling restrained brace can be produced in batch in factories, the circular energy dissipation sections and elastic sleeves can be selected and combined according to the length requirement of the buckling restrained brace, and accordingly the modularized production and design of the core part can be achieved.

The invention discloses steel for a 160MPa grade weather-resistant low yield point damper and a a preparation method. The chemical components comprise 0.02-0.03wt% of C, 0.01-0.03wt% of Si, 0.10-0.25wt% of Mn, less than or equal to 0.015wt% of S, 0.030-0.050% of P, 0.025-0.045wt% of Als, 0.10-0.20wt% of Ni, 0.20-0.40wt% of Cr, 0.20-0.50wt% of Cu, 0.015-0.030wt% of Ti, 0.0010-0.0020wt% of B, less than or equal to 0.0040wt% of N, less than or equal to 0.0020wt% of O, less than or equal to 0.00015wt% of H, less than or equal to 0.25wt% of Ceq and the balance of Fe and inevitable impurities. A steel plate and a steel strip for the 160MPa grade weather-resistant low yield point damper are prepared by the following steps: pre-treatment desulfurization of blast furnace molten iron; converter smelting of molten iron; deoxidizing alloying of molten steel; LF furnace refining of molten steel; VD vacuum refining of molten steel; casting of molten steel; heating of a steel blank; descaling of the steel blank; controlled rolling and controlled cooling of the molten steel; finish rolling and cooling and the like. The steel disclosed by the invention overcomes the defect that existing steel for the low yield point damper is poor in weather resistance, so that the service life of the damper is prolonged, and the using and maintenance costs are lowered.

The invention discloses a heat treatment method for regulating and controlling static and dynamic load mechanical properties and anisotropy of an SLM titanium alloy. The SLM forming manner enables a microstructure of a formed part to have an obvious thick columnar crystal structure, so that the mechanical properties of the formed part have obvious anisotropy. The SLM Ti-6Al-4V formed part is subjected to heat treatment including circulating spheroidizing annealing and solid solution aging, and a double-state structure is obtained. After heat treatment, the plasticity of a sample piece is greatly improved (the elongation reaches 18.35%), the mechanical properties exceed the forging standard, the sample stability is improved, and the anisotropy of plasticity is greatly reduced; after circulating spheroidizing annealing and solid solution aging heat treatment, the fracture toughness of the sample piece is 85.5 MPa, and the anisotropy is smaller than or equal to 15%; when the strain amplitude is larger than or equal to 0.9%, the low-cycle fatigue performance of the sample piece subjected to heat treatment is higher than that of a forged piece; the crack propagation path in the double-state structure is longer than that of the forged piece; when the strain amplitude is 0.7%-0.9%, the low-cycle fatigue performance is equivalent to that of the forged piece; and when the strain amplitude is smaller than or equal to 0.7%, the low-cycle fatigue performance is smaller than that of the forged piece.

The invention discloses a novel assembled buckling-restrained brace. The novel assembled buckling-restrained brace comprises an outer connecting plate and an anti-instability steel pipe, the outer connecting plate is fixedly connected with a force transmission round pipe, the force transmission round pipe is nested in the anti-instability steel pipe, the end, away from the outer connecting plate,of the force transmission round pipe is connected with a round connecting end plate in a welded mode, and the other end of the round connecting end plate is connected with a dumbbell-shaped energy consumption cone steel bar in a friction welded mode, cross stiffening ribs are embedded in the ends, away from the connecting plates, of the force transmission round pipes, the circle centers of the force transmission outer connecting plates, the circle centers of the anti-instability steel pipes, the circle connecting end plates, the circle centers of the dumbbell-shaped energy dissipation cone steel bars, the circle centers of the cross stiffening ribs and the circle centers of the force transmission round pipes are located on the same axis, gaps of 2 mm are formed in the force transmission round pipes and the anti-instability steel pipes, and the cross stiffening rib is connected with the circular connecting end plate in a welding manner and is not fixedly connected with the force transfer circular pipe. The structure is convenient to machine, easy to install, environmentally friendly, capable of improving production efficiency, stable in structural form and capable of remarkably enhancing energy consumption capacity and improving shock resistance and shock absorption capacity of the structure.

The invention discloses a damage-controllable energy dissipator. The energy dissipator comprises an extrusion rotating part, deformable connecting plates, a friction energy dissipation sheet and a base plate, a sliding groove is formed in the upper part of the extrusion rotating part, a sliding part is connected in the sliding groove, a first friction lug plate and first yield lug plates are connected to the lower part of the extrusion rotating part, a second friction lug plate and second yield lug plates are connected to the base plate, the first friction lug plate and the second friction lugplate are hinged through a first pin shaft, the end, which penetrates out of the first friction lug plate and the second friction lug plate, of the first pin shaft is provided with an elastic elementin a penetrating mode and then is locked by a locking nut, the friction energy dissipation sheet is clamped between the first friction lug plate and the second friction lug plate, one ends of the deformable connecting rods are hinged to the first yield lug plates through second pin shafts, and the other ends of the deformable connecting rods are also hinged to the second yield lug plates throughsecond pin shafts. The energy dissipator has the advantages that the energy dissipation and seismic mitigation effects can be fully exerted, in addition, the damage development degree of the energy dissipator can be effectively controlled, and the energy dissipation and seismic mitigation effects are guaranteed.

The invention discloses a method for eliminating the shrinkage defect of a nickel-based turbine blade, and in particular relates to a method for eliminating the shrinkage defect of a M38 nickel-based alloy turbine blade through utilizing a hot isostatic pressing technology. The method is characterized by sequentially comprising the followings steps of: selecting a nickel-based turbine blade with the shrinkage defect under the internal quality standard as a treatment object, cleaning and drying the treatment object, putting the cleaned and dried nickel-based turbine blade into a graphite heating furnace, heating the graphite heating furnace while filling argon, then cooling along with the furnace, air cooling and the like. After the method is adopted, the service life of the turbine blade can be prolonged, moreover, waste products can be recycled, and the waste can be reduced.

The invention discloses a design and a manufacturing method of a soft steel material with a damping anti-seismic device for a bridge, and relates to a steel formula. The detailed ratio which is designed in a formulaaccording to the mass percentage ratio of a component element of a steel type refers to the claim. The manufacturing method comprises the steps of smelting, continuous casting, round steel rolling, round steel finishing and finished product forging. A low-carbon aluminum killed steel with a specified chemical component range is prepared according to the formula and the manufacturingmethod, and meanwhile, element contents of P and Swhich influence plastic performance are strictly controlled, and the residual element contentsare controlledand thennot only tensile strength and yield strength of the soft steel are guaranteed to be within a certain strength range, but also the specific value of the yield strength and the tensile strength is not greater than 0.72, and a manufactured anti-seismic isolation device is excellent in equivalent damping ratio and low-cycle fatigue performance, so that the use requirements of stress and energy absorption and seismic resistance of a railway bridge comprehensive working condition are met.

The invention discloses an earthquake loss avoiding self-recovery type metal double-barrel space damping energy dissipation device, and belongs to the field of civil engineering structure energy dissipating and damping. An energy dissipation barrel A, an energy dissipation barrel B, a limiting ring plate, a limiting baffle, a limiting groove plate, a limiting ring cavity, a connecting piece, a positioning hanging plate and a thin rubber pad are included. The earthquake loss avoiding self-recovery type metal double-barrel space damping energy dissipation device is characterized in that the twoenergy dissipation barrels are adsorbed and fixed through a connecting piece magnet, meanwhile, the contact faces of the two energy dissipation barrels are matched and inset through grooves and flanges to form meshing, and accordingly double-barrel three-dimension relative deformation is restrained; each energy dissipation barrel is internally provided with a stretching and extrusion deformation limiting device, and the energy dissipation barrel deformation range can be controlled; when the relative stretching and deformation of the double barrels are too large, the adsorbed contact faces areseparated and recover from deformation, and when deformation is little, adsorbing and meshing can be conducted, and the double barrels recover into a whole. By means of the earthquake loss avoiding self-recovery type metal double-barrel space damping energy dissipation device, stable plastic energy consumption can be generated within a certain deformation range of the energy dissipation barrels, the earthquake loss avoiding self-recovery type metal double-barrel space damping energy dissipation device can adapt to space three-dimension deformation and large displacement, the initial state canbe automatically recovered, repairing after the earthquake is avoided, the structure is simple, and installation is convenient and fast.

The invention discloses a preparation method for steel plates and steel strips for low-cost 225 MPa-stage low-yield-point dampers. The preparation method comprises the following four steps of heatinga steel billet, descaling, rough rolling, finishing rolling and cooling, specifically, low-carbon aluminum killed steel billets are heated, high-pressure water sprays the high-temperature steel billets for descaling, then the steel billets are sent into a reversible double-rack furnace coiling rolling machine for reciprocating rough rolling and finishing rolling, the steel strips operate on cooling roller ways after rolling is completed and enter a laminar flow cooling section to be cooled, the finished plates are rolled or sheared on line, then stack cooling is conducted till the indoor temperature is reached, and thus steel with the thickening being 6-30 mm for the 225 MPa-stage low-yield-point dampers is obtained. According to the preparation method, expensive micro-alloying elements donot need to be added, smelting means such as furnace external refining and vacuum treatment are not needed, heat treatment does not need to be conducted after rolling, and thus the production cost islow. The steel plates and the steel strips obtained through the preparation method have low yield strength fluctuation, good plasticity and good toughness and have excellent impact and welding performance and low-cycle fatigue performance.

The invention discloses a manufacturing method of 100-MPa low-yield-point architectural antiseismic steel. The steel comprises the following chemical components in percentage by mass: at most 0.01% of C, at most 0.02% of Si, 0.05-0.1% of Mn, 0.01-0.06% of Al, at most 0.01% of P, at most 0.004% of S, at most 0.004% of N, 0.01-0.08% of Ti, and the balance of Fe and inevitable impurities. The method comprises the following steps: refining, continuous casting, heating, rough rolling, electromagnetic induction heating, finish rolling, laminar cooling, coiling and the like. The yield strength of the 100-MPa low-yield-point architectural antiseismic steel is up to 80-120 MPa, and the elongation percentage is greater than 50%; and the steel has the advantages of favorable plastic deformation, favorable impact toughness, lower alloy cost, practical technique, favorable weldability and favorable low cycle fatigue property.