356 results about "Creep" patented technology

The invention relates to the technical field of powder metallurgy, in particular to a preparation process of a graphene composite profile prepared from brass waste, which comprises the following steps: selecting the brass waste containing different components according to the application scene of the graphene composite profile; the brass waste materials are smashed into brass block-shaped smashed materials; the preparation method comprises the following steps: adding 0.001-10% by mass of graphene into the brass block-shaped crushed aggregates, and carrying out wet ball milling to form a first-size mixed powder liquid; carrying out semi-solid rotary shearing and stirring processing on the mixture; and continuously extruding the graphene-brass mixed base material to form a graphene composite profile blank, and carrying out post-process to obtain the graphene composite profile capable of overcoming brass spot, line and surface defects. According to the invention, a powder metallurgy process is combined with a medium-temperature continuous extrusion process, so that the brass waste is efficiently and directly recycled without pollution, and the physical properties and chemical properties such as hardness, strength, conductivity, corrosion resistance and high-temperature creep resistance of the composite material are greatly improved. The invention further correspondingly discloses the graphene composite profile and application.

The invention discloses a method for preparing a foam core composite material component, and relates to the technical field of composite material component preparation. The foam core composite material component consists of two parts: foam and a composite material outer skin. The preparation method proposed by the invention comprises the following steps: firstly laying a layer of foam film on the foam, and then laying the outer skin. Common composite material forming processes such as molding, autoclave, and bag pressing can be adopted. In the preparation method of the invention, the foam film is not affected by the shape of the foam core composite material component and the mold structure during the forming process, and can provide internal expansion force, reduce the influence of the prepreg glue content, surface weight, etc. on the thickness difference of the blank; reduce the foam processing size error and the influence of the mold processing size; reduce the influence of high temperature creep during the foam forming process; reduce the influence of mold temperature unevenness, pressure unevenness, and thermal expansion coefficient difference; and greatly improve the reliability of the internal quality of the sandwich composite material component.

The invention relates to the technical field of alloy performance prediction, in particular to a nickel-based superalloy creep prediction method considering hot corrosion environment damage, and the method comprises the following steps: obtaining a nickel-based superalloy test piece; calibrating an equivalent hot corrosion damage coefficient according to data of the hot corrosion-creep test; calculating equivalent hot corrosion damage according to the thickness of the control element depletion layer and the equivalent hot corrosion damage coefficient; acquiring a creep constitutive model; equivalent hot corrosion damage is introduced into the creep constitutive model, and a hot corrosion-creep constitutive model is obtained; and according to the hot corrosion-creep constitutive model, predicting the creep of the hot corrosion environment damage of the nickel-based superalloy. According to the method, the creep life of the nickel-based superalloy in the hot corrosion environment can be predicted to be within 1.2 times of an error scattering band, and the creep damage condition of the nickel-based superalloy in the hot corrosion environment can be reflected.

The invention belongs to the field of high-temperature alloy powder metallurgy, and particularly relates to a low-cost and high-performance GH4079 alloy workpiece and a powder metallurgy forming method thereof. The powder metallurgy forming method comprises the steps that GH4079 spherical powder is adopted for preparing a GH4079 alloy blank, solid solution and aging heat treatment is conducted on the GH4079 alloy blank, and a GH4079 alloy workpiece is obtained; solid solution and aging heat treatment is conducted on the GH4079 alloy blank, the whole heat treatment process is simple, the process is simple and convenient, consumed time is short, energy consumption is lower, the method is suitable for industrial application, the obtained GH4079 alloy workpiece is excellent in mechanical property, and under the room temperature condition, the tensile strength is larger than 1500 MPa, the yield strength is larger than 1020 MPa, the ductility is larger than 20%, and the percentage reduction of area is larger than 25%; and under the condition of 650 DEG C / 882 MPa, the endurance life is longer than 210 h.

The invention discloses an annular furnace heat-resistant supporting forged chassis and an additive manufacturing process and a fixing device thereof, and belongs to the technical field of plating of metal materials, and the annular furnace heat-resistant supporting forged chassis comprises the steps that heat-resistant alloy steel base metal with specific components is prepared; carrying out laser texturing and nickel-based alloy bottom layer pretreatment on the surface of the steel plate; performing laser cladding on high-silicon high-temperature alloy powder containing niobium and rare earth elements to form a functional cladding layer, and performing gradient cladding on the edge of the atmosphere guide hole; and finally, carrying out heat treatment and assembling with a fan-shaped refractory brick fixing device. A composite oxide film and a multi-scale strengthening system are constructed, hydrogen resistance and brittleness resistance are effectively achieved, interface thermal stress is relieved, cracking and stripping of a cladding layer are avoided, a fixing device adapts to thermal expansion, the atmosphere is dredged, and the annealing uniformity of a steel coil is improved; the problems of creep deformation, hydrogen embrittlement, cladding layer stripping and thermal stress cracking of a traditional supporting component under the conditions of high temperature, heavy load and nitrogen and hydrogen atmosphere are solved.

The invention discloses a preparation method of a TA11 alloy bar with high creep resistance. The preparation method comprises the following steps: S1, ingot casting preparation: performing VAR smelting on an alloy for three times to obtain a TA11 alloy ingot with components meeting requirements; s2, intermediate billet forging is conducted, specifically, the qualified cast ingot obtained in the S1 is subjected to two-heating-number forging at the temperature higher than the beta phase transformation point temperature, and an intermediate billet is obtained; s3, multi-heating-number circulating forging is conducted, specifically, the TA11 alloy intermediate blank obtained in the S2 is subjected to five-heating-number forging deformation within the range above and below the beta phase transformation point temperature, and an intermediate precision forging blank which is uniform in structure and high in alpha phase content is obtained; and S4, finish forging machining of a finished product bar is conducted, specifically, finish forging machining is conducted on the TA11 alloy intermediate finish forging blank obtained in the S3 at the temperature below the phase transformation point temperature, and the TA11 alloy bar with the high creep resistance is obtained. The TA11 alloy bar prepared through the method is high in alpha-phase content and stable in control, the structure is uniform and consistent, and the high-temperature creep resistance is stably controlled to be smaller than or equal to 0.15%.

The invention belongs to the technical field of rock engineering, discloses a carbonaceous slate unsteady creep model construction method based on time-stress evolution, and aims to solve the problem that creep parameters of existing carbonaceous slate cannot be accurate due to the fact that the creep parameters are regarded as constants or expressed by a nonlinear function. The unsteady creep model comprises an improved generalized Kelvin body and a Newton body with a switch, wherein the Newton body takes the stress level into consideration, and the improved generalized Kelvin body is connected with the Newton body with the switch in series. According to the method, more accurate creep parameters of the carbonaceous slate can be obtained, and a theoretical model is provided for tunnel surrounding rock creep deformation research and tunnel long-term stability analysis of a carbonaceous slate stratum tunnel penetrating through an extremely high crustal stress area.

The invention belongs to the technical field of conductor materials, and particularly relates to a creep-resistant high-strength high-conductivity aluminum alloy conductor material and a preparation method and application thereof. In the preparation process of the creep-resistant high-strength high-conductivity aluminum alloy conductor material provided by the invention, Be, Mo, Co and the like are introduced into the aluminum alloy conductor material through the intermediate alloy, and AlB3 is used for boronizing treatment; meanwhile, an expansion extrusion process is introduced between aluminum alloy continuous casting and continuous rolling processes, pre-aging treatment is carried out after solid solution heat treatment, and final aging treatment is carried out after drawing treatment; the components and the preparation process of the aluminum alloy conductor material are improved, the comprehensive performance such as conductivity, creep resistance and strength is remarkably improved, the comprehensive performance requirements of new energy automobiles on aluminum alloy conductors can be met, and the technical problem that in the prior art, the comprehensive performance of the aluminum alloy conductor material is poor is solved.

The invention discloses a high-temperature-resistant austenite heat-resistant casting alloy material and an application method thereof, and belongs to the technical field of austenite heat-resistant casting alloy materials. The alloy material comprises C, Si, Mn, Cr, Al, Nb, Ti, Zr, N, Mo, W, Y, Ni and Fe elements with specific mass percentage content. Wherein the mass percentage contents of the C, Cr, Al and Ti elements meet the condition that the value of f1 obtained by the calculation model 1 meets the condition that f1% is larger than or equal to 2%, and f1% represents the volume percentage content of an M23C6 precipitated phase of the alloy material at the application temperature of 1100 DEG C or above. The alloy material obtained by the invention has remarkable high-temperature creep resistance in an extreme high-temperature environment, has a stable and compact oxidation film and reinforced carbide, and can keep excellent structural stability and high-temperature mechanical properties under a long-term service condition.

The invention belongs to the technical field of high-temperature alloys. Specifically, the invention provides a forming method of the NiCr20TiAl high-temperature alloy rolled metal, and the invention further provides the NiCr20TiAl high-temperature alloy rolled metal prepared by the forming method. The forming method comprises the following steps: heating a NiCr20TiAl high-temperature alloy square billet to about gt; the method comprises the following steps: heating a billet to a temperature in the range of 1120 DEG C to about 1200 DEG C, holding the billet at the temperature for about 1 to about 2 hours, and then subjecting the held billet to rolling. According to the forming method, the grain size uniformity of the rolled NiCr20TiAl high-temperature alloy bar can be improved, the total cross-section grain size of the bar ranges from 3 grades to 8 grades, the total cross-section grain size grade difference is smaller than or equal to 3 grades, and therefore the optimal high-temperature durability performance is achieved.

The invention belongs to the technical field of alloys, and provides a lightweight refractory multi-principal-element alloy with excellent high-temperature creep property, and a preparation method and application thereof. The general formula of the light refractory multi-principal-element alloy with the excellent high-temperature creep property is TiaVbAlcCrdMoe, wherein 43% < = a < = 48%, 43% < = b < = 48%, 2% < = c < = 8%, 2% < = d < = 8% and 1% < = e < = 5%, a + b + c + d + e = 100%, and a, b, c, d and e are mole percentages. The alloy presents an isometric crystal structure in a complete recrystallization state in a thermal mechanical treatment state, the phase structure is a single-phase body-centered cubic BCC structure, the alloy has low density and shows excellent creep property at 650 DEG C / 100 MPa, the creep time exceeds 90 h, and the creep elongation is lower than 10%.

The invention discloses an overflow brick, device and method for stably producing substrate glass, and belongs to the technical field of liquid crystal substrate glass manufacturing. According to the overflow brick provided by the invention, a split type arched overflow brick structure is adopted, so that the influence of the gravity of the overflow brick on the production stability is weakened; meanwhile, a supporting and clamping device of an L-shaped structure is introduced, and negative effects caused by creep deformation are counteracted by applying horizontal clamping acting force. The fixed connecting surface of the first brick body and the second brick body is designed to be the arched curved surface, and the clamping acting force provided by the supporting and clamping device is combined, so that the overall structural stability of the overflow brick is enhanced, and the overflow brick can work stably in a high-temperature and long-time working environment; the creep phenomenon possibly occurring in the production process of advanced-generation substrate glass can be inhibited, and deformation is effectively resisted; and the molten glass is ensured to overflow and pull down in a stable and uniform state, so that the thickness uniformity of the overflow glass is improved, and the production quality of the substrate glass is improved.

The invention provides a method for connecting a titanium-aluminum material and a nickel-based superalloy and a brazing filler metal composition, and relates to the technical field of material welding, and the brazing filler metal composition for connecting the titanium-aluminum material and the nickel-based superalloy comprises a high-entropy alloy middle layer and a Cu middle layer. The Cu intermediate layer is introduced between the high-entropy alloy intermediate layer and the base metal nickel-based superalloy, the low melting point of the Cu intermediate layer is utilized, the Cu intermediate layer is melted into a liquid phase in the welding process, a high-temperature liquid phase environment is formed, element diffusion of the high-entropy alloy intermediate layer and the nickel-based superalloy is facilitated, element exchange between the high-entropy alloy intermediate layer and the nickel-based superalloy is promoted, and the welding quality is improved. And the welding temperature is reduced by 30-100 DEG C, the welding temperature is reduced to 1100-1160 DEG C, the welding temperature is lower than the Ni-based high-temperature alloy solution treatment temperature, Ni-based high-temperature alloy grain growth is avoided, the high-temperature creep property of the Ni-based high-temperature alloy grain growth is kept, the joint structure is optimized, and the welding quality is improved.

To provide a high Ni alloy containing Nb and N that has superior high-temperature creep strength.SOLUTION: A high Ni alloy having superior high-temperature creep strength, the alloy comprising, in mass%, C: 0.08% or less, Cr: 20-30%, Ni: 23-60%, Al: 0.01-0.20%, Ti: 0.05% or less, B: 0.0002-0.0050%, N: 0.10-0.30%, O: 0.006% or less, Ca: 0.0001-0.0050%, at least one of Mo and W in an amount of Mo+0.5×W: 0.01-1.50% (less than 1.50%), Nb: 0.10-0.65%, and at least one of V and Ta in a total amount of 0.01-0.60%, and satisfying the following [Limiting Expression A], and characterized in that the total amount (Nb) of Nb precipitated in the steel material is 0.11 mass% or less. [Limiting Expression A] 0.65≤Nb%+2×V%+Ta%≤1.60.SELECTED DRAWING: Figure 1

The invention discloses a dam material transient-creep parameter progressive optimization inversion method, and belongs to the technical field of dam material parameter inversion, and the method comprises the steps: carrying out the alternating progressive optimization inversion of a multi-objective function set of a transient parameter and a creep parameter until the inversion precision corresponding to the inversion parameter optimal solution obtained through two times of continuous inversion is the same, and obtaining a transient-creep parameter optimal solution; and taking the optimal solution of the transient parameter and the creep parameter obtained by the current inversion as a transient-creep parameter inversion result. According to the method, the transient and creep parameters of the dam are efficiently and accurately identified, so that the inversion precision and the calculation efficiency are improved, the physical rationality of the result is ensured, and reliable support is provided for safety monitoring and risk assessment in the operation period of the dam.

The invention provides a high-temperature-resistant creep-resistant tungsten alloy, and relates to the technical field of powder metallurgy, the tungsten alloy comprises, by mass, 3-8 wt% of Re, 0.2-1 wt% of carbide, 0.1-0.5 wt% of boride, and the balance tungsten and inevitable impurities; the carbide is selected from one or more of TiC, ZrC, TaC and HfC; the boride is selected from one or more of TiB2 (titanium diboride), HfB2 (hafnium diboride) and ZrB2 (zirconium diboride). The high-temperature-resistant creep-resistant tungsten alloy is prepared by adding low-content rhenium, carbide and boride into pure tungsten and adopting a unique preparation method, and the technical defects that an existing tungsten-rhenium alloy is insufficient in strength and creep resistance at the ultrahigh temperature (larger than or equal to 2000 DEG C), and a traditional multi-pass processing technology is complex are overcome.

The invention provides a surrounding rock creep anchor rod timeliness test system under a high ground stress-high temperature coupling effect, and the system comprises a sample, an anchor rod drawing loading system, a confining pressure pressurization assembly, a heating assembly and a data monitoring assembly, and the confining pressure pressurization assembly and the heating assembly apply confining pressure and a temperature field to the sample; the high ground stress-high temperature coupling environment of the deep composite rock mass is simulated, a sample is placed in the high ground stress-high temperature coupling environment of the simulated deep composite rock mass, various parameter data of the sample are detected in real time through the data monitoring assembly, and then various parameter data monitored by the data monitoring assembly in real time are analyzed, so that the high ground stress-high temperature coupling environment of the deep composite rock mass is simulated. The influence of the creep effect of the deep composite rock mass on the anchoring performance of the anchor rod is deeply researched, so that the anchoring interface damage evolution rule under the multi-strain-rate coupling effect is disclosed.

The invention provides a method and a system for evaluating the creep life of a single crystal blade repaired by hot isostatic pressing, and relates to the technical field of engine blade repair. Comprising the following steps: obtaining the porosity of a single crystal blade subjected to hot isostatic pressing repair; the porosity is input into a quantitative mapping model, material creep performance parameters of the repaired single crystal blade are obtained, and the material creep performance parameters comprise critical slitting stress and an initial creep damage rate; and based on the service condition of the single crystal blade, substituting the material creep performance parameters into a creep life prediction model, and calculating to obtain the predicted creep life of the single crystal blade. According to the method, the quantitative mapping model of the porosity and the mechanical property parameters is established, the limitation of traditional dependence on destructive long-time tests is broken through, efficient and nondestructive evaluation of the creep life of the repaired blade is achieved, the evaluation result is reliable, the maintenance efficiency is remarkably improved, and the cost and the risk are reduced.

The invention discloses a heat-resistant aluminum alloy material and a preparation method thereof, and relates to the technical field of metal material metallurgy, and the heat-resistant aluminum alloy material comprises the following components in parts by weight: 78-85 parts of pure aluminum ingot; 4-6 parts of electrolytic copper blocks; 1.5 to 2.5 parts of magnesium ingot; 0.8 to 1.5 parts of zinc particles; 2 to 3.5 parts of metal nickel powder; 0.1 to 0.3 part of titanium-aluminum alloy; 0.05 to 0.15 part of a zirconium-aluminum alloy; 0.08 to 0.2 part of scandium aluminum alloy; 0.05 to 0.12 part of a cerium rare earth metal block; according to the aluminum alloy material disclosed by the invention, the high-temperature performance of the aluminum alloy material is remarkably improved by optimizing the composition proportion of the alloy. Elements such as copper and nickel are added to form a stable strengthening phase, so that the high-temperature strength and the creep resistance are enhanced; due to introduction of rare earth elements cerium and scandium, crystal grains are refined, and the thermal stability of the material is improved; and through compound addition of zirconium and titanium, grain boundary migration at high temperature is further inhibited, the softening phenomenon is effectively delayed, and the material still keeps excellent mechanical properties and oxidation resistance in a long-term high-temperature environment.

According to the method for establishing the rock fractional order creep model under the disturbance effect, test results of rock samples under different confining pressures are obtained, a strain-time curve of the rock samples is drawn according to the creep test results, a proper creep model is obtained in combination with a basic element model, and the rock fractional order creep model is established under the disturbance effect. And respectively adding a damage model and a fractional order model into the creep model, and establishing a damage fractional order creep model. Compared with a traditional model, the fitting result of the improved creep model is consistent with the test result, it is indicated that the improved fractional order model can express the creep behavior of tuff under the complex stress condition, and the defect that the traditional model is difficult to describe the accelerated creep stage is overcome; the evolution law of rock mechanical parameters in the whole creep process is displayed through fractional order change.

The invention discloses an analysis method for determining surrounding rock-support stabilization time based on a viscoelastic-plastic model, and the method comprises the steps: determining geological parameters of surrounding rock through on-site tunnel face photographing and geological investigation, and obtaining creep mechanical characteristic parameters of the surrounding rock through an indoor test; preliminarily determining an excavation and support scheme of the tunnel; the standing time of the surrounding rock and the surrounding rock-structure stabilization time of the preliminarily determined excavation and support scheme are calculated according to a tunnel viscoelastic-plastic model and a longitudinal deformation curve; judging whether the stabilization time of the surrounding rock-support structure meets the time required by the secondary lining installation safety step pitch or not, if so, carrying out excavation construction according to a designed excavation and support scheme, and if not, adjusting the support scheme and recalculating to determine the stabilization time for investigating the section surrounding rock. According to the method, the creep mechanical effect of the surrounding rock is fully considered, and evaluation of the joint tunnel stabilization time is more specific, scientific and quantitative.

The invention relates to a method for obtaining a layer at least partially made of a nitride (N), first comprising the provision of a stack comprising at least one assembly of pads (1000A1-1000B4) extending from a substrate (100). Each pad comprises at least one creep section (220A1-220A5) and one crystalline section (300A1,300A5) surmounting the creep section (200A1-200A5). Then, a crystallite (510A1-510A5) is epitaxially grown on at least some of said pads until coalescence of the crystallites, so as to form a nitride layer (550A). The pads of the assembly are distributed over the substrate, such that the relative arrangement of the pads of the assembly is such that during the epitaxy of the crystallites, the progressive coalescence of the crystallites is always done between, on the one hand, a crystallite or a plurality of coalesced crystallites and, on the other hand, an isolated crystallite.

The invention belongs to the technical field of welding stress prediction, and discloses a welding residual stress and evolution prediction method, the method aims to evaluate and predict the residual stress and evolution of a welding member, and the method comprises the following steps: experimental measurement and fitting of material creep model parameters; the creep model is input into finite element software, and welding simulation is conducted; key point position stress values of the welding component at different time nodes under different welding process parameters are extracted; and training a neural network model by taking the welding process parameters as input features and the stress values extracted by finite element simulation as output features. According to the prediction method, the influence of welding residual stress evolution on a welding component is considered, calculation resources and time are saved, the calculation time can be shortened from 10 hours to 10 s, the prediction error is within 95% compared with finite element simulation, and the method has the advantages that the implementation process is easy to control, and the method is suitable for popularization and application. And an effective solution is provided for engineering on-line prediction of welding residual stress and evolution thereof.

The invention discloses a plate heat exchanger weld creep damage assessment method, system and equipment and a medium, and relates to the technical field of industrial equipment nondestructive testing. The method comprises the following steps: acquiring an infrared thermal image and equipment monitoring data of a welding seam area; preprocessing the infrared thermal image, marking a damage state according to the preprocessed image and equipment monitoring data, and constructing a training sample set; constructing an improved convolutional neural network, performing parameter iterative optimization on the improved convolutional neural network by using the training sample set, and determining the trained network as a damage assessment model; and evaluating real-time monitoring data by using the damage evaluation model, and visually displaying an evaluation result. Through non-contact thermal image acquisition and intelligent algorithm analysis, an internal correlation between a macroscopic temperature field and material microscopic damage is established, and finally real-time, accurate and quantitative evaluation of the creep damage of the welding seam of the in-service plate heat exchanger is realized.

The invention relates to the field of ceramic materials, in particular to a high-temperature-resistant ceramic formula which comprises the following components in percentage by mass: 45-60% of alpha-aluminum oxide; 15 to 25% of stabilized zirconia (3YSZ); 8-15% of beta-phase silicon carbide; 5-10% of alpha-phase silicon nitride; 2-5% of rare earth oxide; 20-35% of ceramic polishing waste; and 0.5-2% of a nano reinforcing agent. Through alpha-AlO / 3YSZ / beta-SiC / alpha-SiN multiphase synergy, a 1600 DEG C stable interpenetrating network structure is formed, the highest use temperature is increased, and the high-temperature creep resistance is excellent; ceramic polishing waste is introduced, raw material cost is reduced, and waste utilization rate is increased; through dynamic vacuum gradient control and laser remelting post-treatment, the yield is increased; a compact layer (porosity is smaller than or equal to 0.5%) of 50 microns is formed on the surface through laser remelting, and the material has triple functions of high temperature resistance, wave absorption and corrosion resistance in combination with a Yion implantation technology.

The invention provides a coal gangue aggregate concrete creep deformation prediction method and system, and belongs to the field of coal gangue aggregate concrete creep deformation prediction. The method aims at solving the problem that a coal gangue aggregate concrete creep performance prediction method does not exist at present. According to the method, a Counto model based on a two-phase composite material theory is utilized to construct an expression of influence of the coal gangue aggregate on a concrete creep final value and a creep development trend, the corresponding expression is introduced into an European standard EC2 creep model, and finally a coal gangue aggregate concrete creep prediction model is established. According to the method, the concrete creep final value amplification coefficient expression is introduced, the amplification coefficient is introduced into the European standard EC2 model, the creep deformation model expression and the amplification coefficient are not mentioned in an existing method, and the blank in the aspect of coal gangue aggregate concrete creep performance prediction is filled up; the effectiveness of the coal gangue aggregate concrete creep deformation prediction model designed by the invention is proved through tests.

The invention discloses a full-stage creep life prediction method coupling residual stress and creep damage, and belongs to the technical field of creep life prediction. The prediction method comprises the steps that a welding workpiece finite element model is established, welding process simulation is conducted, and welding residual stress distribution data are obtained; a heat treatment process creep constitutive model is established, postweld heat treatment stress release damage simulation is conducted on the welded workpiece on the basis of the welding residual stress distribution data, and stress and strain distribution data obtained after heat treatment serve as historical parameters of subsequent service of the welded workpiece; creep damage simulation is conducted on the service process of the welded workpiece on the basis of the stress and strain distribution data obtained after heat treatment, and creep damage in the service process is obtained; and setting a judgment basis for creep failure of the welding workpiece, and determining the creep life of the welding workpiece. According to the invention, physical continuity of internal state evolution of the material in the process from welding manufacturing to service can be realized, and creep damage in the service process can be accurately simulated.

The invention discloses a method for testing compression creep performance of a metal material under a constant-temperature condition, relates to the technical field of high-temperature performance testing of metal materials, and aims to solve the problem of inaccurate creep measurement at a constant temperature. According to the invention, a full-process compression creep performance test method of constant temperature control, loading compensation and strain correction is constructed, the test accuracy and the result consistency of the metal material in a constant temperature environment are improved, closed-loop control is realized through actual measurement temperature, time delay prediction and retaining ring heating are introduced, the constant temperature stability is ensured, and the test accuracy is improved. A micro-stepping compensation mechanism is adopted to maintain constant pressure stress, a loading state is automatically recovered after interruption, then system deformation is deducted through main and auxiliary link cooperation and a compliance template, strain measurement precision is ensured, distortion caused by boundary friction is overcome in combination with end face stick-slip detection and equivalent strain correction, and the accuracy of strain measurement is improved. Finally, automatic output of performance parameters is achieved through steady-state segment extraction and anomaly recognition, and the effectiveness, reproducibility and engineering applicability of test data are guaranteed.

The invention discloses a method and a device for predicting creep deformation of a nickel-based single-crystal high-temperature alloy under creep-oxidation interaction, and belongs to the technical field of material engineering and computational mechanics, and the method is based on microstructure distribution characteristics of the nickel-based single-crystal high-temperature alloy after a creep test in vacuum and atmospheric environments. According to the method, a dynamic growth multilayer geometric model considering oxidation influence is established, and a method capable of predicting alloy creep deformation in different environments is developed by combining a creep constitutive model considering microstructure evolution based on a test observation result. The method mainly comprises the following steps: providing a multilayer geometric model considering oxidation influence; establishing growth kinetic models of different layers; obtaining microstructure evolution laws at different depths; building a multi-scale creep deformation prediction framework considering microstructure evolution; and acquiring model parameters and predicting creep deformation. The invention provides a set of method capable of accurately predicting the creep deformation of the alloy in different environments.

The invention relates to metallurgy, and more particularly to a sheet material made of titanium alloys that are resistant to high heat and oxidation and exhibit structural stability under prolonged operational exposure to temperatures in a range of up to 800° C. and can be used for manufacturing components of a vehicle exhaust system. The present titanium alloy sheet material for the manufacture of components contains: 1.5-3.0 wt % aluminium, 0.1-0.5 wt % molybdenum, 0.1-0.6 wt % silicon, not more than 0.2 wt % iron, not more than 0.15 wt % oxygen, not more than 0.1 wt % carbon, not more than 0.03 wt % nitrogen, not more than 0.015 wt % hydrogen, and the balance titanium. The sheet material has high creep resistance and oxidation resistance values, as well as a stable structure under prolonged operational exposure to temperatures in a range of up to 800° C. The material is suitable for cold forming.