11results about How to "Improve high temperature durability" patented technology

The invention provides a high-temperature alloy for manufacturing a nickel-copper alloy hot extrusion die, which is characterized by comprising the following components in percentage by weight: 0.02 to 0.08 percent of C, less than or equal to 0.15 percent of Si, less than or equal to 0.15 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.01 percent of S, 14.0 to 17.0 percent of Cr, 7.5 to 9.5 percent of Mo, 2.2 to 2.6 percent of Nb, 1.0 to 1.6 percent of Al, 2.2 to 2.8 percent of Ti, 0.005 to 0.015 percent of B, 0.01 to 0.05 percent of Zr, 21.0 to 24.0 percent of Fe and the balance of Ni. The preparation method of the alloy comprises the following processes: firstly, alloy raw materials are subjected to vacuum induction melting and then cast into ingots, then electroslag ingots are obtained through electroslag remelting, then the electroslag ingots are subjected to multi-heating-number forging, and then heat treatment is carried out. The highest use temperature of the alloy reaches 1000 DEG C, and the oxidation rate at 1000 DEG C is as low as 0.08 g / m < 2 >. H; at the temperature of 650 DEG C, the tensile strength reaches 1000 MPa, the yield strength reaches 850 MPa, the fatigue strength is higher than 400 MPa, and the lasting time of the load of 700 MPa reaches 80 h; the service life of a nickel-copper alloy hot extrusion die made of the alloy can reach 25000 times.

The invention discloses a local rolling forming method for a high-temperature alloy gradient structure dual-performance disc and the disc. The two sides of the disc piece are provided with annular groove structures stretching across the disc center to the disc edge partial area. The forming method comprises the steps that a high-temperature alloy disc blank is installed to a mandrel of a clamping part to rotate at the constant speed; the high-temperature alloy disc blank is heated, a disc center area of the high-temperature alloy disc blank is cooled, the temperature of the high-temperature alloy disc blank is formed, and a high-temperature alloy rolling forming temperature gradient interval is kept; according to the thickness of the high-temperature alloy disc blank, the first deformation ratio and the second deformation ratio, the first axial pressing amount of each pass of rolling in the disc center area and the second axial pressing amount of each pass of rolling in the disc edge area are set, the two sides of the high-temperature alloy disc blank are rolled outwards in the radial direction of the disc center area from the specific position of the disc center area in sequence, and a disc piece is formed; and carrying out water cooling treatment on the heat-treated disc to room temperature. According to the invention, the purpose of accurately controlling the crystal double-organization structure in the integral forming of the high-temperature alloy with lower production cost and manufacturing period can be achieved.

The invention relates to a nickel-based single-crystal high-temperature alloy and a preparation method thereof, and relates to the technical field of single-crystal high-temperature alloys. According to the main technical scheme, the nickel-based single crystal high-temperature alloy is prepared from the following chemical components in percentage by mass: 6 to 8 weight percent of Cr, 7 to 9 weight percent of Co, 1 to 3 weight percent of Mo, 7 to 9 weight percent of W, 5 to 7 weight percent of Ta, 5 to 7 weight percent of Al, 0.5 to 2 weight percent of Ti, 0.5 to 1 weight percent of Nb, 0.008 to 0.013 weight percent of N and the balance of Ni. After the Nb and the trace element N are introduced, the void ratio in the as-cast alloy is reduced by 35%, the void ratio of the heat-treated alloy is reduced to 28% after treatment of a set heat treatment process, and the high-temperature strength and the endurance life of the low-cost second-generation single-crystal high-temperature alloy are further improved. The nickel-based single-crystal high-temperature alloy is particularly suitable for manufacturing hot-end high-temperature components with long service life and high reliability in the fields of aviation, aerospace, energy and the like.

The embodiment of the invention discloses a nickel-based superalloy for brush sealing and a preparation method and application thereof. The nickel-based high-temperature alloy is prepared from the following components in percentage by weight: 0.03 to 0.10 percent of C, 0.01 to 0.08 percent of Mn, 19.00 to 21.00 percent of Cr, 3.20 to 3.70 percent of Al, 2.00 to 4.00 percent of Fe, 1.00 to 3.60 percent of Mo, 0.01 to 0.50 percent of Co, 0.001 to 0.05 percent of La and the balance of nickel and inevitable impurities. When the alloy is stretched at the room temperature, the tensile strength reaches 1200 MPa or above, the yield strength is within the required range, the average oxidation rate is reduced to 0.0006 g / m < 2 >. H or below, and the alloy has good oxidation resistance, does not crack during forging machining, has good hot working performance and meets the design and use requirements of advanced aero-engines and gas turbines.

The invention discloses a high-strength anti-steam oxidation coating material and a coating, a preparation method and application thereof, and belongs to the technical field of corrosion prevention of inner walls of through-flow components of thermal power generating units. The high-strength steam oxidation-resistant coating material disclosed by the invention is composed of the solid-phase component and the liquid-phase component, and all the components play a synergistic role, so that the steam oxidation resistance of a coating is improved, and meanwhile, the mechanical property of the coating is enhanced, so that the coating is prevented from cracking in the service process, and the service life of the coating is prolonged. The problem that an existing coating cracks in a high-temperature environment is solved.

A method for manufacturing ultra-high durability titanium alloy using laser additive manufacturing, relating to the field of metal material additive manufacturing, includes the following steps: S1: loading titanium alloy powder into a powder feeding device and fixing a substrate in a forming chamber; S2: after the water and oxygen content in the forming chamber is below 50 ppm, laser forming begins, depositing the molten titanium alloy powder along a planned path to form a dense metal component; after one layer is formed, the next layer is deposited after a set time interval; S3: after deposition is complete, the deposited sample is removed from the forming chamber, the sample is cut to prepare a titanium alloy specimen, and the phase transition point T of the titanium alloy specimen is measured. β S4: Based on the phase transition point T β Based on the measurement results, the titanium alloy samples underwent a first heat treatment and a second heat treatment to obtain the final titanium alloy component. By controlling the solidification process of laser additive manufacturing and precisely matching the dual heat treatments, a titanium alloy component with good high-temperature tensile properties and excellent high-temperature creep resistance was obtained.

The present invention provides a nonaqueous electrolyte solution which contains a nonaqueous solvent and a lithium salt, wherein: the nonaqueous solvent contains acetonitrile in an amount of 3% by volume to 97% by volume relative to the total amount of the nonaqueous solvent; the lithium salt contains a cyclic anion-containing lithium salt that is represented by formula (1) (wherein Rf moieties may be the same as or different from each other, and each represents a fluorine atom or a perfluoro group having 4 or less carbon atoms); and the content of the cyclic anion-containing lithium salt that is represented by formula (1) is from 0.001 to 5 in terms of the molar ratio relative to the content of the acetonitrile.

The present application relates to a kind of high chromium nickel-based superalloy 3D printing structural member heat treatment method.The above-mentioned heat treatment method includes the following steps: high chromium nickel-based superalloy 3D printing structural member is placed into heat treatment furnace;Vacuumizing treatment is carried out to heat treatment furnace;High chromium nickel-based superalloy 3D printing structural member in vacuum environment is heated for the first time, until heated to 600 ℃±10 ℃;High chromium nickel-based superalloy 3D printing structural member is kept for the first preset time period;High chromium nickel-based superalloy 3D printing structural member in vacuum environment is heated for the second time, until heated to 800 ℃±10 ℃;High chromium nickel-based superalloy 3D printing structural member is kept for the second preset time period;High chromium nickel-based superalloy 3D printing structural member is cooled to room temperature.The use of heat treatment method can improve the processing efficiency of high chromium nickel-based superalloy 3D printing structural member, reduce processing cost, improve high temperature endurance performance, so that tensile property, elongation and impact performance are all beyond the level of forging.

The invention discloses a method for improving the high-temperature endurance performance of a deformed nickel-iron-chromium-based high-temperature alloy pipe, which belongs to the technical field of deformation and hot treatment processes of metal materials, and comprises the following steps: carrying out cold deformation on a solid-solution-state nickel-iron-chromium-based high-temperature alloy pipe at room temperature, and then keeping the temperature for 0.5-1 hour at 127-187 DEG C above the gamma'phase precipitation starting temperature; and finally, at the temperature 7-57 DEG C higher than the gamma'phase precipitation starting temperature, heat preservation is conducted for 1-2 h, and the precipitation-strengthened nickel-iron-based high-temperature alloy is obtained. According to the solid-solution-state ferro-nickel-chromium-based alloy pipe treated through the method, under the condition that the original structure grain size is not changed, the sigma CSL (sigma is smaller than or equal to 29) grain boundary proportion is reduced, precipitation of grain boundary and intracrystalline strengthening phases is promoted, precipitation of grain boundary harmful phases in the aging and high-temperature service process is restrained, good matching between the alloy grain boundary strength and the intracrystalline strength is achieved, and the service life of the alloy pipe is prolonged. And meanwhile, the endurance strength and plasticity of the alloy at high temperature are improved.

The invention discloses an anti-radiation nickel-chromium alloy for a modular reactor cladding. The anti-radiation nickel-chromium alloy is prepared from the following elements in percentage by mass: 30%-45% of Cr, 0.5%-3% of Mo, 0.1%-0.4% of Al, 0.3%-0.6% of Fe, 0.05%-0.3% of W, 0.1%-0.25% of Ti, 0.03%-0.2% of C, 0.01%-0.2% of Ce and the balance of Ni and inevitable impurity elements. The preparation method of the alloy comprises the following steps: 1, uniformly mixing materials; 2, vacuum melting; thirdly, multi-heating-number forging is conducted; and 4, heat treatment cooling. According to the nickel-chromium alloy, Ni serves as a matrix, Cr and Mo serve as main alloying elements, a stable and uniform solid solution strengthening austenite phase is formed, and the alloy has excellent mechanical strength, corrosion resistance, radiation resistance and machining performance; the comprehensive mechanical property and the structural stability of the alloy are guaranteed through multi-heating-number forging and heat treatment.

The invention belongs to the technical field of high-temperature alloys, and particularly relates to a nickel-based high-temperature alloy component for additive manufacturing and a preparation method of the nickel-based high-temperature alloy component. The component comprises the following chemical components: 0.14 wt%-0.2 wt% of C, 21 wt%-23 wt% of Co, 0.09 wt%-0.13 wt% of B, 0.015 wt%-0.025 wt% of Zr, 0.25 wt% < = C + B < = 0.32 wt%, and the atomic ratio of C to B is greater than or equal to 1.2. The average grain size of the component is 300 microns or above, on one hand, the grain boundary strength is remarkably improved, on the other hand, the grain boundary proportion in the alloy structure is low, the high-temperature durability of the nickel-based high-temperature alloy component can be improved, the requirement for long-time use at the temperature of 900 DEG C or above is met, and the durability life of the component obtained through testing at the temperature of 900 DEG C and the pressure of 172 MPa is 35 h or above.