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30results about How to "Increased creep life" patented technology

Turbine blade airfoil having improved creep capability

A turbine blade including an airfoil having a profile in accordance with Table 1 is disclosed. The turbine blade has a plurality of cooling passages extending radially outward through the airfoil. The aerodynamic profile of the airfoil has been reconfigured to reduce airfoil stress for a given operating temperature, thereby resulting in increased creep rupture life of the airfoil.
Owner:ANSALDO ENERGIA SWITZERLAND AG

Turbine blade airfoil having improved creep capability

A turbine blade including an airfoil having a profile in accordance with Table 1 is disclosed. The turbine blade has a plurality of cooling passages extending radially outward through the airfoil. The aerodynamic profile of the airfoil has been reconfigured to reduce airfoil stress for a given operating temperature, thereby resulting in increased creep rupture life of the airfoil.
Owner:ANSALDO ENERGIA SWITZERLAND AG

Lead-free alloy for low-temperature welding welder

InactiveCN101537545AReduce lead poisoning and other disadvantagesIncrease stickinessWelding/cutting media/materialsSoldering mediaIndiumPhosphor
The invention relates to lead-free alloy, which is suitable for use in welding for fixing parts on a substrate and for use on an external electrode for EEFL during the production of electric appliance and electronic products, so that a melting point and welding strength which are better than the prior welding can be obtained without lead. In addition, the alloy is free from lead and can reduce the influences of coal gas and the like generated during welding on human bodies to the maximum degree. Meanwhile, the lead-free alloy has the characteristic that: tin (Sn) is added with 10 to 30 weight percent of bismuthism (Bi), 0.001 to 2.0 weight percent of indium (In), and 0.001 to 0.5 weight percent of phosphor (P), as well as one or more of stibium (Sb), silver (Ag), copper (Cu), germanium (Ge) and gallium (Ga) as additives.
Owner:HEESUNG MATERIAL

Impeller and turbocharger

An impeller (112, 212) comprising a rotation axis (21), a radial direction, a backplate (2) and a number of vanes (9) which are connected to the backplate (2) at a line of connection (22) is provided. Each vane (9) comprises an upstream side (14), a downstream side (15) and an outer side (23). The downstream side (15) of each vane (9) comprises an edge portion (27) which is located near the outerside (23). The vanes (9) project radially over the backplate (2) and the downstream side (15) further comprises a connecting portion (24) connecting the edge portion (27) to the backplate (2) and including an angle with the radial direction. The connecting portion (24) comprises a convex rounded portion which is located near the line of connection (22). Moreover, a turbocharger comprising an inventive impeller (112, 212) is disclosed.
Owner:NAPIER TURBOCHARGERS LTD

Turbine rotor blade of gas turbine

The invention relates to a turbine rotor blade of a gas turbine. The turbine rotor blade of the gas turbine comprises a blade profile, a blade platform, a blade top and a blade root, wherein a coolingair channel loop is arranged in the blade, a cooling air channel and a cooling air channel inlet are arranged in the loop, and ribs are arranged in the cooling air channel; and the blade surface is divided into a blade leading edge and a blade trail edge by a pressure surface and a suction surface. The blade tail edge is provided with a tail edge exhaust slot, a tail edge channel is provided witha guide groove structure, and at least one turbulence column is arranged in the guide groove structure; and the blade root cooling air channel is divided into at least two channels by a partition plate, and the partition plate is gradually bent towards the front edge side of the blade in the airflow direction. According to the turbine rotor blade of the gas turbine, the heat exchange effect of aleading edge channel, the tail edge exhaust slot and cooling air in the blade can be improved, and the leading edge metal temperature close to the blade platform and the metal temperature of the tailedge, the blade platform close to the tail edge and the blade root can be reduced.
Owner:HANGZHOU TURBINE POWER GRP

Method for prolonging long-time service life of magnesium alloy through drying

The invention discloses a method for prolonging the long-time service life of a magnesium alloy through drying. The magnesium alloy comprises, by mass, 0.1-0.65% of calcium, 0.05-1.2% of zinc and thebalance magnesium, and the mass percentage ratio of calcium to zinc is greater than or equal to 0.4; or comprises, by mass, 0.1-0.65% of calcium, 0.05-0.6 % of silicon and the balance magnesium, and the mass percentage ratio of calcium to silicon is greater than or equal to 0.9. The method comprises the steps of preparing a magnesium alloy ingot blank through a semicontinuous casting method, conducting hot rolling or hot extrusion on the magnesium alloy ingot blank to form a plate with the thickness of 2-20 mm, conducting solution treatment on the plate, conducting cold deformation on the plate at true strain of 0.01-0.07 at indoor temperature, conducting baking on the plate at 150-230 DEG C for 10-120 min and then conducting water quenching. Compared with a magnesium alloy not subjected to baking treatment, the yield strength of the magnesium alloy subjected to baking can be improved by 30% or more, and the fatigue and creep life of the magnesium alloy can be prolonged by at least 5 times under the long-time service conditions.
Owner:CENT SOUTH UNIV

Centrifugal compressor impeller cooling

A centrifugal compressor including: a casing; at least one impeller supported for rotation in the casing and provided with a hub, a shroud and an impeller eye; an impeller-eye sealing arrangement, for sealing the impeller in the region of said impeller eye. The centrifugal compressor further includes at least one cooling-medium portlocated at the impeller-eye sealing arrangement, arranged for delivering a cooling medium around the impeller eye.
Owner:NUOVO PIGNONE TECH SRL

Nickel-based welding wire, manufacturing method of nickel-based welding wire and welding process of nickel-based welding wire

ActiveCN114505619AGuaranteed high temperature oxidation resistanceGuaranteed solid solution strengtheningNuclear energy generationWelding/cutting media/materialsHeat transfer tubeDuctility
The invention provides a nickel-based welding wire, a manufacturing method of the nickel-based welding wire and a welding process of the nickel-based welding wire, relates to the technical field of welding materials, and aims to solve the problem of poor welding effect of a heat transfer tube made of an Incoloy800H material. The nickel-based welding wire comprises an outer skin and a flux core filled in the outer skin. The outer skin is an Inconel 625 belt, and the flux core comprises, by mass, 28.0%-32.0% of Co, 19.0%-23.0% of Cr, 7.0%-9.0% of Mo, 1.5%-3.5% of Nb, 1.0%-1.5% of Cu, 1.5%-3.5% of W, 0.6%-1.0% of B, 0.4%-0.6% of La and the balance Ni. According to the nickel-based welding wire provided by the invention, a joint part can keep relatively high tensile strength and ductility under normal-temperature and high-temperature conditions.
Owner:XIAN THERMAL POWER RES INST CO LTD

Sn-based soldering flux and preparation method thereof

The invention relates to a Sn-based soldering flux and a preparation method thereof. The Sn-based soldering flux is mainly prepared by uniformly mixing nano-alumina dispersion strengthened copper Cu-Al2O3 with a molten-state Sn-based alloy. According to the Sn-based soldering flux and the preparation method thereof, the problem of non-uniform dispersion distribution of nano-particles in the Sn-based alloy is solved; and compared with an existing product, the soldering flux has the advantages of being high in tensile strength, high in elongation, high in bonding strength after welding, excellent in high-temperature and low-temperature cyclic impact resistance, high in welding reliability, and the like.
Owner:BEIJING COMPO ADVANCED TECH

High Nb-TiAl alloy added with nano yttrium oxide and preparation method of high Nb-TiAl alloy

ActiveCN110819873ARefinement pitchImprove room temperatureIngotMaterials science
The invention discloses a high Nb-TiAl alloy added with nano yttrium oxide and a preparation method of the high Nb-TiAl alloy, relates to the field of intermetallic compounds and preparation processesthereof, and aims to solve the technical problems of poor high-temperature mechanical property and weak creep resistance of an existing TiAl alloy. The alloy comprises, by mole: Al: 45-48%, Nb: 6-10%, V: 2.5-3.5%, nano yttrium oxide: 0.05-3%, and the balance Ti. The preparation method comprises the steps of briquetting and shaping raw materials; melting alloy block materials, and adding an yttrium oxide prefabricated block for smelting to obtain an alloy ingot; and then carrying out homogenization annealing treatment to finish the preparation. According to the high Nb-TiAl alloy added with the nano yttrium oxide and the preparation method of the high Nb-TiAl alloy, the high-temperature mechanical property and high-temperature creep resistance of the high Nb-TiAl alloy are improved; and the high Nb-TiAl alloy added with the nano yttrium oxide is applied to the field of high-temperature structural materials.
Owner:HARBIN INST OF TECH

Thermal treatment method capable of prolonging long-time service life of welding seams in magnesium-alloy friction stir welding process

InactiveCN110438325AIncrease the degree of lattice distortionIncrease recrystallization nucleation pointFurnace typesHeat treatment furnacesQuenchingWeld seam
The invention discloses a thermal treatment method capable of prolonging the long-time service life of welding seams in the magnesium-alloy friction stir welding process. The method comprises the steps that aging treatment and water quenching are conducted on a magnesium alloy subjected to solution treatment for 0.5 h to 72 h at 180 DEG C to 280 DEG C; friction stir welding is conducted at room temperature, wherein the rotating speed ranges from 100 rpm to 1,000 rpm, and the welding speed ranges from 20 mm / min to 120 mm / min; and annealing treatment is conducted on the welded magnesium alloy for 0.5 h to 10 h at 250 DEG C to 350 DEG C, the magnesium alloy is directly cooled to 100 DEG C to 200 DEG C after being annealed, and then aging treatment and water quenching are conducted for 0.5 h to 6 h. According to the thermal treatment method, a precipitated phase is introduced for the magnesium alloy, the lattice distortion degree is increased, and the crystallization rate is increased; andrare earth magnesium alloy or high-alloyed magnesium alloy which is difficult to recrystallize is rapidly crystallized in the friction stir welding process, so that the yield strength of the weldingseams is improved, and synchronous improvement of the long-time service lives in the directions parallel to or perpendicular to the welding seam direction is achieved.
Owner:CENT SOUTH UNIV

Method for obtaining retained austenite in ferrite heat resistant steel T91

The invention relates to a method for obtaining retained austenite in ferrite heat resistant steel T91. The heat treatment process comprises the following steps: performing heat treatment on a T91 steel pipe subjected to hot rolling, namely heating to the temperature of 1100-1200 DEG C at a speed of 4 DEG C per second, and preserving the temperature for 10-20 minutes; continuously cooling to room temperature at a speed of 3 DEG C per second; determining the initial temperature (Ms) and ending temperature (Mf) of martensite phase transformation of the T91 steel in the heat treatment continuous cooling process according to a changing curve of the obtained linear expansion amount along with temperature; heating another identical T91 steel pipe to the temperature of 1100-1200 DEG C at a speed of 4 DEG C per second, and preserving the temperature for 10-20 minutes; and cooling to an optional temperature between Ms and Mf obtained in the step 1 at a speed of 3 DEG C per second, preserving the temperature for 10-45 minutes, and continuously cooling to room temperature at the speed of 3 DEG C per second. The retained austenite existing in a martensite lath boundary in a film form can be obtained in a sample subjected to heat treatment.
Owner:TIANJIN UNIV

Turbine rotor device with pressing structure

The invention relates to a turbine rotor device with a pressing structure. The turbine rotor device comprises a blade and a wheel disc which are connected through a fir-shaped tenon and mortises in amatched mode, and further comprises a pressing device installed in a gap between the tenon and the mortises in an interference mode, a bottom face supporting plate arranged on the pressing device is located at the bottom of the mortises and attached to the end face of the tenon, and supporting columns are symmetrically arranged in gaps between the two sides of tenon teeth of the tenon and the mortises, so that the tenon teeth are pressed on the inner walls of the mortises. According to the turbine rotor device, the relative positions of the tenon teeth and the mortises are fixed, the area of gaps where cold air passes through is increased, the temperature of a wheel flange part and the connecting positions of the blade tenon and the wheel disc mortises is reduced, the thermal stress of theblade tenon is reduced, and the creep life of the blade tenon, the wheel disc mortise structure and a wheel disc wheel flange is prolonged.
Owner:BEIJING SNECMA SAIC TURBOTECH CO LTD

Fir-tree type disc tenon connecting device

The invention relates to a fir-tree type disc tenon connecting device. The fir-tree type disc tenon connecting device comprises a tenon and a tenon groove which are connected in a matched mode, wherein the tenon comprises a first tenon tooth and a second tenon tooth which are symmetrically arranged in structures; tooth widths of tooth surfaces which are arranged on the first tenon tooth and the second tenon tooth are equal; tooth widths of lower planes which are arranged on the first tenon tooth and the second tenon tooth are equal; pressure angles of the tooth surfaces are the same; a tooth end surface of the second tenon tooth is a plane; the tenon groove comprises a first tenon groove and a second tenon groove, and the first tenon groove and the second tenon groove are correspondingly arranged; the first tenon groove and the second tenon groove are each provided with a plane groove surface adhered to the corresponding tooth surface and a large circular arc connected with the corresponding groove surface in a cutting mode; and the bottom of each groove is a plane. By adopting the fir-tree type disc tenon connecting device, the problem of stress concentration at a connecting partof the blade tenon and the wheel disc tenon groove is greatly improved, so that a cooling air channel between the tenon and the tenon groove is enlarged, the temperature of the connecting part is greatly reduced, the working reliability is good, and the high-quality requirement of an aeroengine for a turbine rotor is met.
Owner:BEIJING SNECMA SAIC TURBOTECH CO LTD

Large-wall-thickness P92 steel welding method

The invention discloses a large-wall-thickness P92 steel welding method. The method comprises the following steps of forming and cleaning a welding groove; preheating the welding groove before welding, and then performing backing by adopting a GTAW welding method; welding a welded joint with a welding rod of phi3.2 with an SMAW welding method, wherein a weaving method for a swinging fast thin layer is adopted during welding; performing polishing inspection on a welding layer, and determining the crack cleaning method; repeating the steps above till welding of the whole welding groove is finished; facing the welding groove by adopting the SMAW welding method; and performing thermal treatment on the welded joint. Through reasonable optimization of parameters in the welding process, a properpreheating temperature, inter-layer temperature and thermal treatment temperature are kept. The performance of the welded joint is matched optimally through adoption of a reasonable welding process, so that the P92 steel welding quality is improved, and beneficial guarantee is provided for the normal running of equipment pipelines.
Owner:陕西榆林能源集团横山煤电有限公司

A kind of rhenium-free nickel-based single crystal superalloy and preparation method thereof

The invention discloses a rhenium-free nickel-based single crystal superalloy and a preparation method thereof. The composition of the rhenium-free nickel-based single crystal superalloy of the present invention is represented by mass percentage as 7.25-7.75% of Cr, 4.8-5.2% of Co, 1.8-2.2% of Mo, 7.8-8.2% of W, and 6.3-6.7% of Ta , 6.0-6.2% Al, 0.12-0.18% Hf, 0.04-0.06% C, 0.003-0.005% B, 0.010-0.030% Y, and the rest is Ni. The preparation of the above-mentioned rhenium-free nickel-based single crystal superalloy comprises the following steps: using a vacuum induction furnace to melt the master alloy, and preparing a cast rod of the master alloy by gravity casting; using the seed crystal method to pass the Bridgeman directional solidification technology at a temperature gradient of 150-250K / cm , the single crystal test bar was prepared at a pulling rate of 5-100 μm / s; the single crystal superalloy was solid solution treated in the range of 1295-1305 °C for 2-4 hours, followed by air cooling, and then in the range of 1090-1310 °C 2-4 hours of high-temperature aging treatment within 2-4 hours, followed by air cooling; then 16-24 hours of low-temperature aging treatment in the range of 850-890 ° C, followed by air cooling.
Owner:NANJING UNIV OF SCI & TECH

A heat treatment method for improving the long service life of friction stir welding welds of magnesium alloys

The invention discloses a thermal treatment method capable of prolonging the long-time service life of welding seams in the magnesium-alloy friction stir welding process. The method comprises the steps that aging treatment and water quenching are conducted on a magnesium alloy subjected to solution treatment for 0.5 h to 72 h at 180 DEG C to 280 DEG C; friction stir welding is conducted at room temperature, wherein the rotating speed ranges from 100 rpm to 1,000 rpm, and the welding speed ranges from 20 mm / min to 120 mm / min; and annealing treatment is conducted on the welded magnesium alloy for 0.5 h to 10 h at 250 DEG C to 350 DEG C, the magnesium alloy is directly cooled to 100 DEG C to 200 DEG C after being annealed, and then aging treatment and water quenching are conducted for 0.5 h to 6 h. According to the thermal treatment method, a precipitated phase is introduced for the magnesium alloy, the lattice distortion degree is increased, and the crystallization rate is increased; andrare earth magnesium alloy or high-alloyed magnesium alloy which is difficult to recrystallize is rapidly crystallized in the friction stir welding process, so that the yield strength of the weldingseams is improved, and synchronous improvement of the long-time service lives in the directions parallel to or perpendicular to the welding seam direction is achieved.
Owner:CENT SOUTH UNIV

A heat-resistant flame-retardant magnesium alloy and its deformation heat treatment method

InactiveCN110438380BSignificant age strengtheningIncreased creep lifeSolution treatmentIngot
The invention discloses a heat-resistant flame-retardant magnesium alloy and a thermo-mechanical treatment method thereof. The magnesium alloy comprises the following elements by mass: 3-16% of Gd, 4-8% of Er, 0.2-1% of Ca, 0.02-0.2% of Zn and the balance being Mg, wherein the mass ratio of Ca to Zn is >= 3. Magnesium alloy ingot billets are prepared by semi-continuous casting, and subjected to hot rolling or hot extrusion to form a plate being 5-25 mm in thickness, the plate is subjected to solid solution treatment, aging is performed at 200-260 DEG C, and water quenching is performed; and then, true strain is performed between room temperature and 100 DEG C, then aging is performed at 150-220 DEG C, and water quenching is performed. The alloy prepared in the invention contains a honeycomb microstructure consisting of a prismatic-plane precipitated phase, a prismatic-plane dislocation, a basal-plane precipitated phase and a basal-plane dislocation; the effect of the synchronous improvement on the heat-resistant and flame-retardant properties of the magnesium alloy is significant; simple equipment, low production cost and high efficiency are achieved; and the magnesium alloy is suitable for use in the industries of aeronautics and astronautics, railway trains and automobile lightweight.
Owner:CENT SOUTH UNIV

Metallic wall section cooling method

Provided is a metallic wall section cooling method for partially cooling the outer surface of a pipe for circulating steam. The temperature of a pressurized fluid is 500-700 DEG C and the temperatureof the outer surface of the pipe is at least 200 DEG C. The temperature difference in the plate thickness direction of the pipe is no greater than 300 DEG C. The temperature difference at a cooled portion in the pipe axial direction of the pipe is 500 DEG C if the dimension of the pipe in the pipe axial direction is within the range of + / -100 mm. The temperature difference in the pipe circumferential direction of the pipe is no greater than 50 DEG C.
Owner:MITSUBISHI POWER LTD

Turbine rotor device with cooling and pressing structure

The invention relates to a turbine rotor device with a cooling and pressing structure. The turbine rotor device comprises blades and a wheel disc which are matched and connected through a fir-shaped tenon and a mortise, and further comprises the cooling and pressing device which is arranged in a gap between the end surface of the tenon and the bottom of the mortise in an interference manner, the cooling and pressing device is provided with a lower main supporting column and upper branch supporting columns which are symmetrically arranged. According to the turbine rotor device with the coolingand pressing structure, the main supporting column and the branch supporting columns form a plurality of cold air channels with the tenon tooth end face and the mortise respectively, so that the relative positions of the tenon teeth and the mortise are fixed, the effective convection area of cold air is increased, the space of a cold air channel and the effective convection area are increased, thetemperature of the rim part and the temperature of the joint of the blade tenon and the wheel disc mortise are reduced, the thermal stress of the blade tenon is reduced, and the creep life of the blade tenon, the wheel disc mortise structure and the wheel disc rim is prolonged.
Owner:BEIJING SNECMA SAIC TURBOTECH CO LTD

Method for controlling residual ferrite and martensite slab structure in 9Cr-ODS steel

The present invention relates to a method for controlling residual ferrite and martensite slab structure in a 9Cr-ODS steel. The method comprises: mixing pre-alloyed powder and nano-scale Y2O3 according to a mass ratio of 99.65:0.35, wherein the pre-alloyed powder comprises, by mass, 1 part of Fe, 9 parts of Cr, 1.5 parts of W, 0.2 part of V, 0.07 part of Ta, and 0.1 part of C; carrying out mechanical ball milling in a ball mill, heating to a temperature of 800 DEG C by using discharging plasma sintering, carrying out thermal insulation for 5-10 min, continuously heating to a temperature of 1100 DEG C, and carrying out thermal insulation for 10-15 min to obtain a 9Cr-ODS martensite steel having a molding compactness of more than 99%; and carrying out heat treatment on the sintering-state 9Cr-ODS martensite steel, heating to a temperature of 1100 DEG C at a heating rate of 10-40 DEG C / min, carrying out thermal insulation, and cooling to a room temperature. According to the present invention, with the method, the content of the residual ferrite in the 9Cr-ODS martensite steel is effectively controlled, and the ultrafine nano-scale martensite slab can be obtained during the cooling process.
Owner:TIANJIN UNIV

A turbine rotor device with a compact structure

The invention relates to a turbine rotor device with a pressing structure. The turbine rotor device comprises a blade and a wheel disc which are connected through a fir-shaped tenon and mortises in amatched mode, and further comprises a pressing device installed in a gap between the tenon and the mortises in an interference mode, a bottom face supporting plate arranged on the pressing device is located at the bottom of the mortises and attached to the end face of the tenon, and supporting columns are symmetrically arranged in gaps between the two sides of tenon teeth of the tenon and the mortises, so that the tenon teeth are pressed on the inner walls of the mortises. According to the turbine rotor device, the relative positions of the tenon teeth and the mortises are fixed, the area of gaps where cold air passes through is increased, the temperature of a wheel flange part and the connecting positions of the blade tenon and the wheel disc mortises is reduced, the thermal stress of theblade tenon is reduced, and the creep life of the blade tenon, the wheel disc mortise structure and a wheel disc wheel flange is prolonged.
Owner:BEIJING SNECMA SAIC TURBOTECH CO LTD
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