349 results about "Creep" patented technology

A kind of alloy, which is anti-squirming, and the components of it and the weight percent of them is: 1.5-10%Y, 0.15-2.0%Zr, 0.3-2.0%Nd, 2.5-8%Gd, and one kind or several kinds of components among Sm, Dy, Tb, Ho, Er, Tm and Eu is also contained, the other is Mg. the following steps are contained in the method: (1) To prepare material (2) To improve the temperature of warm-up stove and melting stove (3) To warm up the material (4) To melt the purified magnesium ingots in batches (5) To melt the other materials, which has been warmed up, in the Mg solution. (6) To distribute equably the alloy components in the Mg solution. (7) To make into casting ingot, cast, billet, board material, pipe material, model material, stick material, line material and all kinds of forged piece. The Mg alloy can fulfill the need owing a higher mechanics performance and anti-squirming performance under high temperate, and the anti-causticity performance is higher than the Mg in existence.

The invention discloses a high-temperature creep deformation prediction and creep damage analysis method for a high-chrome steel component. The method comprises the following steps of: establishing a theoretical model, determining material parameters, designing a numerical integration algorithm, carrying out the secondary development of finite element software, carrying out the creep damage analysis of the component and the like. Compared with an existing technical scheme, the method disclosed by the invention is characterized in that a great improvement is carried out, the accurate prediction of the creep behavior and the creep damage of the high-chrome steel component can be realized, and therefore, the method has an important application value in the fields of the security design and the residual life evaluation of high-temperature high-pressure components in a supercritical generator set.

The invention relates to a Mn-containing creep-resisting rolled zinc alloy belt material. The material comprises the following components in percentage by weight: 0.5 to 3.0 percent of copper, 0.01 to 2.0 percent of manganese, 0.05 to 0.3 percent of titanium and the balance of zinc and less than 0.05 percent of impurities. An alloy component can also contain the following component in percentage by mass: 0.01 to 0.5 percent of X, wherein the X is at least one of aluminum and rare earth elements (Ce+La). A method for preparing the material comprises the following steps of: smelting by a protective covering method and adding alloy elements in the forms of pure zinc, Zn-Cu, Zn-Ti, Cu-Mn, pure aluminum and Ce+La composite rare earth, wherein a smelting temperature is between 650 and 740 DEG C; pouring at the temperature of between 420 and 480 DEG C; uniformly annealing cast ingots at the temperature of between 350 and 380 DEG C for 6 to 10 hours; performing hot rolling for multiple times at the temperature of between 220 and 280 DEG C, wherein total deformation is between 60 and 95 percent; performing cold rolling, wherein the total deformation is between 50 and 80 percent; and after rolling, annealing at the temperature of between 180 and 200 DEG C for 2 to 3 hours. The alloy of the invention has high creep resistance, hot processing performance and mechanical property and is suitable for the fields of building decoration, transportation, instruments, meters and the like.

The invention relates to a polyether-ether-ketone composite material which consists of polyether-ether-ketone, nanoparticles, filling materials and addition agent materials. The composite material comprises 75 to 95 portions of polyether-ether-ketone powders, 5 to 10 portions of the nanoparticles, 10 to 20 portions of the filling materials and 2 to 5 portions of the additive agents by weight. The filling materials are glass fiber, carbon fiber, quartz powder and MoS2 or toner. A method of compression moulding forming adopted is that: materials is prepared according to the formula; materials are mixed: the materials prepared according to designed requirements poured into an automatic material mixing machine for evenly mixing, the mixing time is between 0.5 minute and 3 minutes, then compressing process is carried out, and the blended mixture is sent to a mould cavity for moulding. The material can be used for sealing materials products. Various valve sealing elements produced by the invention has properties of creep resisting, corrosion resistance, heat resistance and pressurization, etc.; the ability of pressurization and wear resistance of the material are improved, and at the same time the cost is lowered by 10 to 20 percent or even higher, thus being beneficial to using and promotion of the materials.

The invention provides a preparation method of a material increase manufactured nickel-based high-temperature alloy reserved with the Laves phase. GH4169 high-temperature alloy with the Laves phase distributed in a dispersed particle shape is prepared through the preparation method, and compared with industrial forged and cast isometric crystal high-temperature alloy, the high-temperature mechanical properties, especially the high-temperature creep property, the high-temperature endurance life and the like are greatly improved. The preparation method comprises the following steps that firstly, in a processing rood, GH4160 high-temperature alloy powder or wire materials are processed through a high-energy beam heat source to be continuously melted and deposited on a base plate, so that the GH4169 high-temperature alloy reserved with the Laves phase is prepared; secondly, the prepared GH4169 high-temperature alloy reserved with the Laves phase is naturally cooled in the processing room and taken out after the temperature of the GH4169 high-temperature alloy is below 100 DEG C; and thirdly, two stages of heat treatment is conducted on the GH4169 high-temperature alloy which is taken out of the processing and reserved with the Laves phase in sequence, the first stage is completed by conducting heat preservation for 8-24 hours under the condition that the GH4169 high-temperature alloy is heated to the temperature of 700-740 DEG C, then the second stage is completed by cooling the GH4169 high-temperature alloy to the temperature below 600-640 DEG C along with a heat preservation furnace and then conducting heat preservation for eight hours, and finally air cooling is conducted till the indoor temperature is reached, so that the material increase manufactured nickel-based high-temperature alloy reserved with the Laves phase is obtained.

The invention discloses a device for testing material creep under the coupling action of tensile stress and the environment. The device comprises a support, a weight, a heating jacket, a container containing a saturated inorganic salt solution, a strain demodulator, a power supply, a temperature controller, a strain sensor and a test piece, wherein the support comprises a positioning plate, an upper spherical hinge, an upper clamping head, a supporting rod, a bearing plate, a base plate, a lower clamping head and a lower spherical hinge; the supporting rod is connected with the bearing plate through a sliding bearing; the test piece is embedded in a groove in the upper clamping head and a groove in the lower clamping head; the weight is positioned on the bearing plate; the heating jacket covers on the outer side of the support; the container is positioned between the support and the heating jacket; the strain sensor is adhered to the outer wall surface of the test piece; and the temperature controller is connected with the ring-shaped heating jacket. By adopting the device, the reliability of the test process can be improved, and the accuracy of results is ensured. Meanwhile, the invention also discloses a test method for the test device. The method is simple and easy to operate, and can keep that the test piece does not generate stress relaxation in the process of long-term load application, and the stress is uniformly distributed.

The invention provides a high temperature strain foil performance parameter tester and a test method thereof. The high temperature strain foil performance parameter tester is composed of a heating system, a heat preservation system, a temperature control system, a circulation system, a support system and a loading system. The tester and the test method of the invention can test technical parameters of the high temperature strain foil such as null shift, thermal output, thermal delay, mechanical delay, change of sensitivity coefficient with temperature, creep deformation of the high temperature strain foil, creep deformation of constant strength calibration beams made of measured target material and the like. The tester and the test method of the invention feature high test precision, good high temperature repeatability and reliable test results, thus providing data correction for long-term high temperature strain monitoring.

A high strength and creep resistant soft magnetic Fe—Co alloy includes, in weight %, Fe and Co such that the difference between the Fe and Co is at least 2%, at least 35% Co, and 2.5%≦(V+Mo+Nb), wherein 0.4%≦Mo and/or 0.4%≦Nb. This alloy can further include B, C, W, Ni, Ti, Cr, Mn and/or Al. A vanadium-free high strength soft magnetic Fe—Co alloy includes, in weight %, Fe and Co such that the difference between the Fe and Co is at least 2%, and at least 15% Co, the alloy further satisfying (0.1%≦Nb and 0.1%≦W) or 0.25%≦Mn. This alloy can further include B, C, Ni, Ti, Cr and/or Al.

The invention discloses a quick isothermal forging method and device for preparing a less-deformable alloy cake blank. The device comprises a heating device, an automatic feeding device, a horizontal hydraulic forging device, a blank positioning device and a flame heating device. A mould material used by the device is a nickel-based alloy with creep strength which is higher than the flow stress of a forged high-temperature alloy under corresponding forging temperature and deformation rate. In the method, a homogenized electroslag remelting continuous directional solidification technology or other processes with maneuverability can be selected for preparing a high-alloyed less-deformable alloy directional solidification billet, as well as a fine grain billet prepared by adopting the processes, such as powder metallurgy and the like. The method and the device have the advantages of short production period, convenience for control and low cost, and are suitable for mass production of large-size high-clean and uniform tissue high-alloying less-deformable alloy cake blanks.

The invention relates to an operational method for measuring creep parameters and infiltration parameters of smashed rocks simultaneously, which realizes loading of axial pressure and infiltration pressure difference by the aid of a smashed rock creep-infiltration full-process coupling testing device. The operational method includes: firstly, determining initial height of rock in a cylinder before loading, starting an axial loading device then, starting an electric test pump to saturate rocks, applying axial load, injecting water to the rocks to infiltrate according to set water pressure, finally changing the axial load to perform the creep-infiltration test of the next-grade stress stage. The infiltration characteristic parameters are obtained by matching of a scatter diagram of hole pressure gradient and average infiltration speed and the Forchheimer formula, and the creep parameters are obtained by matching of Kelvin-Volgt creep model and an axial strain time curve. The operational method has the advantages that creep model during creep and infiltration full-process couple of the smashed rocks can be acquired, mutual affection of creep and infiltration can be indicated through the parameters, operation results can provide theoretical basis for theoretical analysis and numerical value simulation of creep-infiltration of the smashed rocks.

The invention relates to a micro alloyed oxide dispersion-strengthening ferrite steel, wherein the chemical formula of the steel is Fe-(14-16)Cr-(1-3)W-(0.3-1.0)Ti-(0.3-0.6)Y2O3-(0.5-3)Cu. The preparation method of the steel comprises the following steps of: thermosetting and moulding after mixing and ball milling Fe-Cr-W, Ti, Y2O3 and Cu in proportion, or thermosetting and moulding after mixing ball milling powder and Fe-Cr-W alloy powder in the ratio of 1: (2-4), and then carrying out solution treatment or solution and ageing treatment, thus micro Cu alloyed oxide dispersion-strengthening ferrite steel is obtained. In the invention, Cu is introduced into a matrix lattice by mechanical alloying; nano-scale copper-rich second phase is precipitated from a matrix in the thermosetting, moulding and heat treatment process; and the strength and high-temperature creep resistance of alloy are greatly improved. The invention has the advantages of simple preparation process, short preparation period, low preparation cost and low impurity content, and is easy to operate. The prepared alloy has good room-temperature and high-temperature mechanical properties and is applicable to industrial production.

The invention relates to a composite high-temperature molybdenum disilicide-base material and a preparation method thereof. The method can prepare the composite high-temperature material under lower production cost, which has the highest room temperature toughness equivalent to that of high-temperature alloys, higher high temperature intensity, high temperature creep resistant performance and certain plastic processing performance; the substrate of the composite high-temperature material is a composite substrate composed of MoSi2 and Si3N4, wherein the average crystal grain size of the MoSi2 is smaller than 2 microns, and the average grain diameter of the Si3N4 particulates is smaller than 1 microns. The method adopts the following technical proposal: Mo2N powder or powder of Mo5Si3 or Mo3Si are used as initial powder to obtain composite powder Mo3Si-Mo5Si3-Si3N4 or Mo5Si3-MoSi2-Si3N4 after being processed by siliconization or nitridation-siliconization, the composite powder is further enhanced and mixed with materials such as Si powder, SiC powder and the like, and is pressing molded, and then a blank is sintered under the temperature of 1415 to 1550 DEG C, and finally the sintered blank is plastic deformed, thus obtaining a required dense article of the composite high-temperature material.

The present invention discloses a multiaxial creep-fatigue prediction method based on ABAQUS, which comprises: S1: establishing an ABAQUS finite element model, and defining the viscoplastic constitutive equation of the material to be tested by means of the user subroutine UMAT; S2: determining the model parameters required by the viscoplastic constitutive equation; S3: establishing the fatigue damage calculation model and creep damage calculation model of the multiaxial stress-strain state of the material to be tested; S4: establishing an ABAQUS finite element model under the multiaxial stress-strain state, and calculating the stress-strain tensor of each cycle based on the defined viscoplastic constitutive equation and the model parameters; S5: calculating the equivalent stress and equivalent plastic strain by means of the user subroutine USDFLD, and superimposing the fatigue damage and creep damage of each cycle according to the linear cumulative damage criterion to obtain the crack initiation life of the material to be tested based on the fatigue damage calculation model and creep damage calculation model in combination with the stress-strain tensor.

The invention discloses an alloy creep resistant heat resistant steel submerged arc welding stick, mainly comprising the following elements by percentage: 0.05 to 0.18% of C, 0.80 to 1.20% of Mn, 0.40 to 0.80% of Si, not more than 0.010% of S, not more than 0.35% of Cu, 2.20-3.80% of Cr, 0.40 to 0.80% of Ni, 0.8 to 1.40% of Mo, 0.90 to 1.30% of W, 0.30 to 0.80% of V, 0.20 to 0.50% of Ti, 0.08 to 0.16% of B, not more than 0.05% of Al, and balance of Fe. The alloy creep resistant heat resistant steel submerged arc welding stick is applied to the welding of heat-resisting steel 2.23 Cr-1Mo and 12CrMoWVB alloy hat-resisting steel, and SA-335P22 steel of a nuclear power boiler, a gas turbine generator, a high pressure steam pipe, a petroleum chemical industry and a nuclear power device at a working temperature of 600 DEG C. The welding process parameters of the alloy creep resistant heat resistant steel submerged arc welding stick comprise: a welding stick diameter is phi4.0mm, a coordinated welding agent is SJ101, a welding current is 550A, a welding voltage is 30V, and an inter-channel temperature is 135-165 DGC C. The alloy creep resistant heat resistant steel submerged arc welding stick can service for long-term under the high temperature of 600 DEG C without the occurrence of creep rupture phenomenon.

The invention provides a bauxite-based low-creep mullite product, which belongs to the field of fire-resistant materials. The bauxite-based low-creep mullite product is prepared by the following steps of: adding quartz sand, a sillimanite mineral, corundum, industrial aluminum oxide, kaolin and the like into high-alumina bauxite serving as a base material; proportioning, homogenizing, mixing, shaping and drying the mixture; and sintering the mixture at the temperature of 1,650 DEG C under the normal pressure to obtain the low-cost and high-grade bauxite-based low-creep mullite fire-resistant product. In the preparation, a composite technology route is adopted, the mineral composition is optimized and the mullitization during the production and use is effectively controlled, so the high-grade fire-resistant material product can be obtained, the superior high temperature performance of the mullite is brought into full play and the creep is small and the expansion is slight in the use of the product; and the preparation of the product can fully utilize the available resources of China, improve the comprehensive utilization value of the resources and optimize the product structure. The product can be widely applied to the parts, such as heat storage chambers, small furnaces, feeding ports, material passage systems and the like, of glass melting furnaces and other high temperature industrial furnaces.

The invention discloses a preparation method of superfine grain nano-structure oxide dispersion strengthened steel. The preparation method comprises the following steps of: performing ball-milling mechanical alloying on alloy powder which is prepared by an atomization method or pure metal element powder in a corresponding constituent element ratio, metal Ti powder and Y2O3 powder in a nanometer scale in vacuum or under Ar gas protection so as to form solid solution alloy powder which is rich in supersaturated Y, Ti and O; and putting the supersaturated solid solution alloy powder into a mould, and performing solidification sintering in spark plasma sintering equipment so as to obtain the superfine grain nano-structure oxide dispersion strengthened steel, wherein sintering environment can be vacuum or inert gas; a sintering temperature is between 800 and 1,200 DEG C; heat preserving time is between 1 and 15min; and pressure is between 10 and 200MPa. The grain size of the alloy is refined from a micron level to a level which is equal to or less than 500 nanometers by the method, the characteristic microstructure and the irradiation resistance performance of the nano-structure oxide dispersion strengthened steel are maintained, and the alloy strength and the high temperature creep strength are greatly improved, so that the using requirement of core parts of an advanced nuclear reactor on the high temperature resistance and the irradiation resistance of materials are met.

The invention relates to a tin, silver and copper based lead-free composite solder with enhanced nanometer-structure and a preparation method thereof, which belong to the technical field of the manufacturing of metal-based lead-free composite solders. The existing spreading process for SnSn-Ag-Cu series lead-free solder is characterized by poor processing performance, short creep rupture service life and high cost. The composite solder of the invention consists of 97 wt percent to 99 wt percent of commercial Sn-3.0Ag-0.5Cu solder paste and 1 wt % to 3 wt % of enhanced particles (POSS1, POSS2 or POSS3). The solder paste consists of 85 wt percent of Sn-3.0Ag-0.5Cu solder and 15 wt % of flux. The tin, silver and copper based lead-free composite solder with enhanced nanometer-structure is prepared by stirring and mixing the solder paste and enhanced particles according to the component concentration for 15 to 30 minutes. The composite solder of the invention has the advantages of good wettability and good creep rupture resistance, high shearing strength, excellent mechanical property, long creep rupture service life of the soldered joint and simple preparation process, etc.

The invention provides a method for manufacturing an austenite series heat-resistant alloy pipe and an austenite series heat-resistant alloy pipe manufactured by the method, the austenite series heat-resistant alloy pipe is excellent in creep strength of hot working/cold working position after heat treatment. The method for manufacturing the austenite series heat-resistant alloy pipe comprises bending, expanding, hot working or cold working an alloy pipe after heat treatment to form a working portion, and after baking with the condition that the rate of coverage of carbonized matter in grain boundaries of the metallographic structure of the working portion and an intermetallic compound is below 50%, wherein the alloy pipe comprises chemical composition as following, by mass, 0.02 % to 0.13 % of C, less than 1 % of Si, less than 2 % of Mn, less than 0.03 % of P, less than 0.01 % of S, 25 % to 36 % of Cr, 40 % to 60 % of Ni, less than 0.3 % of Al, 2.0 % to 10.0 % of W, 0.05 % to 1.5 % of Ti, 0.002 % to 0.03 % of Zr, 0 % to 3 % of Mo, 0 % to 1.5 % of Nb, 0 % to 15 % of Co, 0 % to 0.05 % of Ca, 0 % to 0.05 % of Mg, 0 % to 0.2 % of rare earth element, 0 % to 0.2 % of Hf, 0 % to 0.2 % of B, 0 % to 1.5 % of V, 0 % to 2.0 % of Ta, 0 % to 3.0 % of Re, and the reminder comprising Fe and inevitable impurities.

The invention relates to a device and a method for measuring high-temperature creep volume deformation of rocks. The technical problem that creep volume deformation of a sample cannot be directly measured by an existing device is solved. According to the scheme adopted by the invention, the device for measuring the high-temperature creep volume deformation of the rocks comprises a triaxial test kettle, an axial displacement sensor, a magnetostrictive liquid level meter, a confining pressure control port, a gas loading system, a liquid loading system, a data acquisition and processing system and five control valves. The method comprises the following steps: 1) firstly, connecting all parts; 2) carrying out gas and liquid loading on a confining pressure cavity of the triaxial test kettle, sothat the confining pressure cavity is loaded to the target confining pressure of the sample; 3) applying axial pressure to carry out a creep test under target temperature and pressure, 4) recordinginitial data of the sample in a data acquisition and processing system, setting a data recording interval and carrying out automatic data recording, and 5) calculating high-temperature creep volume deformation and volume strain of the rock sample through a formula according to the recorded data.

The invention discloses a device and a method for measuring the stress evolution in a metallic thin film when a current is loaded. A sample placing device is provided, and current loading is realized through the wire contact between the metallic thin film and the sample placing device. A metallic thin film sample is placed in a dovetail-shaped groove in a metallic material placing platform, the metallic thin film sample is in wire contact with metallic placing platform by gravity to ensure that the metallic thin film and the metallic placing platform are conductive, the Joule heat and the electric creep curvature of the metallic thin film change when the current is applied, and then a plurality of laser stress measurement devices are used to measure the stress evolution in the metallic thin film when the current is loaded. No external force is applied on the thin film sample to realize in-situ measurement of the stress evolution in the metallic thin film when the current is loaded and consequently analyzes the creep deformation behavior of the metallic thin film in a heat/force/electricity multiple coupling field. The method has the advantages of simplicity, accuracy, etc.

The invention discloses a longevous mullite brick for a hot blast stove. The brick is prepared from the following raw materials in percentage by weight: 75-95% of mullite containing 70-80wt% of Al2O3, 0-20% of sillimanite and 4-6% of Guangxi white mud, and further comprises 2-4% of lignin based on total weight of the above three raw materials. The preparation method comprises the following steps: a, weighing the raw materials in proportion, and adding water, mixing and stirring to prepare a green brick; b, drying; and c, firing: the sintering temperature is 1380-1480 DEG C. The sillimanite is added into the mullite, so that the creep resistance of the brick can be remarkably improved. Particularly, the sillimanite is mullitized under a condition of a high temperature over 1400 DEG C and accompanies volume expansion, the expansion just can offset or partially offset contraction generated in the high-temperature using process, so that the material has good creep resistance.

The invention relates to a method for preparing a porous mullite heat insulating material at low cost. The method specifically comprises the following operation steps of: (1) raw material pretreatment; (2) material mixing; (3) foaming; (4) slurry injection; (5) demoulding and drying; and (6) sintering. The obtained mullite heat insulating material has the porosity in the range from 85% to 93%, the volume density in the range from 0.21 to 0.36 g/cm<3>, the heat conductivity coefficient in the range from 0.05 to 0.10 W/(m.K) and the compressive strength in the range from 1.0 to 3.0 MPa. The heat insulating material prepared by the invention takes mullite as the principal crystalline phase, and mullite is low in heat conductivity, low in specific density and good in thermal stability, and has unique advantages such as excellent creep resistance and erosion resistance and the like; and the major raw material utilized in industrial waste: coal ash; and as a result, a technical route which is low in cost, high in added value and simple in technical process is provided for comprehensive utilization of the coal ash.

The invention provides a no-destructive testing method and a no-destructive testing device for creep cavity damage of a high chromium martensitic heat-resistant steel joint. The detection difficult problem of the creep cavity damage of a novel high chromium martensitic heat-resistant steel joint is solved by adopting a nonlinear ultrasonic technology. The damage degree of the joint is evaluated byusing high-order harmonics generated by interaction between high-energy radio frequency pulse and micro defects inside a material. According to the no-destructive testing method disclosed by the invention, the high-temperature creep damage degree of the high chromium martensitic heat-resistant steel joint is detected by using a nonlinear ultrasonic technology, and the quantitative relation between a creep cavity and nonlinear ultrasonic parameters is established, so that the quantitative evaluation of the creep cavity damage during the service of the novel high chromium martensitic heat-resistant steel joint is realized and further long-term safe operation of an ultra-thermal power unit is ensured.