238 results about "Creep" patented technology

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 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%.

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.

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 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.

The invention discloses a residual creep life prediction method based on microscopic damage characteristics. The residual creep life prediction method comprises the following steps: acquiring interrupt samples in different damage states through a creep interrupt test; quantitatively characterizing the grain boundary orientation difference and the geometric necessary dislocation density of the interrupted sample by using an electron back scattering diffraction technology; a quantitative damage index is constructed based on the grain boundary orientation difference and the geometric necessary dislocation density, the quantitative damage index is used as an internal variable to be coupled into a Marson-Miller parameter model, and a microscopic-macroscopic associated residual life prediction model is established; and through a microscopic-macroscopic associated residual life prediction model, predicting the residual life of the material under different service times to obtain the residual creep life. According to the method, the microscopic damage state in the material can be directly and quantitatively reflected, early, sensitive and accurate prediction of the residual creep life of the in-service component is realized, and a reliable basis is provided for safe operation and maintenance decision of an overdue service unit of a power plant.

The application relates to a high-entropy alloy with excellent creep performance and a preparation method thereof. a Co b Cr c Ni d Ta p Al q M n wherein 10<=a<=20, 20<=b<=25, 10<=c<=20, 25<=d<=35, 5<=p<=10, 0<=q<=8 and 0<=n<=5. The preparation method comprises the following steps: allocating raw materials according to designed components, then carrying out smelting under a protective atmosphere, and then carrying out solid solution water quenching treatment + hot rolling treatment and again solid solution treatment, and then quenching after heat preservation at 750 DEG C to 950 DEG C. The product is obtained by reasonably regulating and controlling components, heat deformation and heat treatment processes. The product has a service life of 1245h under high-temperature creep conditions of 750 DEG C / 350MPa, is far higher than similar products, has a tensile strength of greater than 1.5GPa at room temperature, breaks through the bottleneck that Laves eutectic high-entropy alloys have no tensile plasticity at room temperature, and has a wide engineering application prospect.

The invention discloses high-endurance-strength high-silicon martensite heat-resistant steel for a lead-bismuth reactor and a preparation method of the high-endurance-strength high-silicon martensite heat-resistant steel, and belongs to the technical field of corrosion-resistant and heat- The heat-resistant steel comprises C, Si, Cr, Ni, Mo, W, Mn, V, Nb and N, the Mo equivalent is 0.8-1.2, the CNB is smaller than 14, and the balance is Fe and inevitable impurities. The formation of a compact SiO2 protective film is promoted by increasing the content of Si, and meanwhile, Mo and W are adopted for synergistic solution strengthening and are matched with N, V and Nb to form a dispersed MX precipitated phase. The heat-resistant steel is prepared through the processes of smelting, homogenizing, forging, hot rolling, normalizing and tempering, and a full-martensite structure can be obtained. And the obtained material has good liquid lead and bismuth corrosion resistance, room-temperature and high-temperature mechanical properties and relatively high high-temperature endurance strength, and is suitable for structural materials serving in high-temperature liquid lead and bismuth environments such as a lead-cooled fast reactor and the like.

Provided is an alloy material with which it is possible to obtain high creep strength and excellent welding hot cracking resistance and hot workability. This alloy material contains, in mass%, 0.050 to 0.100% of C, 1.00% or less of Si, 1.50% or less of Mn, 19.00 to 23.00% of Cr, 30.00 to 35.00% of Ni, 0.010% or less of N, 0.15 to 0.70% of Al, 0.15 to 0.70% of Ti, 0.0001 to 0.0030% of B, 0.0010 to 0.5000% of Nb, 0.01 to 1.00% of Mo, and 0.0001 to 0.0200% of Ca, with the remainder being Fe and impurities, and satisfies formula (1) and formula (2), and also satisfies formula (3) when B is less than or equal to 0.0010%. 0.60 lt, 0.60 lt; al + Tilt; 1.20 (1), 3.3-41 C-Si + 2Mo + 3Ti + 245B-12Nb < = 2.00 (2), and 0.4 + 67 C + 1.3 Si + 5.5 Mo + 5.2 Ti + 13.4 Nb < = 8.25 (3).

The invention discloses a material creep behavior prediction method and device based on a physical mechanism weighted network, and aims to solve the problems of low prediction precision and poor physical interpretability of an existing data-driven model under a small sample condition. The method comprises the following steps: constructing a physical mechanism weighting network which comprises a plurality of weighting mechanism units; each weighting mechanism unit is formed by coupling a weighting layer and a physical mechanism layer, the physical mechanism layer is packaged with a preset creep physical mechanism model, and the weighting layer is configured to represent a competition and conversion relationship of different physical mechanisms under an external load condition through a learnable weighting function; training the physical mechanism weighting network by using creep experiment data of a material so as to determine parameters of the weighting function; and predicting the creep behavior of the target material under a given stress-temperature condition by using the trained physical mechanism weighting network. According to the method, high-precision and physically interpretable creep prediction under small samples and a wide load domain is realized.

The invention provides a double-phase high-cobalt alloy strip and a preparation method thereof, and belongs to the field of metal materials. The double-phase high-cobalt alloy strip is composed of the following chemical components of 1.5%-4.0% of Fe, smaller than or equal to 0.2% of C, smaller than or equal to 0.002% of T.O, smaller than or equal to 0.001% of N, 0-1% of Mn, 0.5%-5% of Si, Cr, Mo and a matrix element Co. Wherein Cr and Mo meet the following relational expressions: 20% < = [Cr] + [Mo] < = 25% and 0 < = [Mo] / [Cr] < = 4, in the expressions, [Cr] represents the mass fraction of Cr, and [Mo] represents the mass fraction of Mo. According to the preparation method, a double-phase structure, the inclusion content and a strengthening phase are precisely regulated and controlled through element matching, the room-temperature plasticity and the cold machining capacity are remarkably improved while the high-temperature mechanical properties (such as strength and creep resistance) of the alloy are guaranteed, and synchronous optimization of the machining property and the mechanical property is achieved.

The invention discloses a method for improving the high-temperature creep property of a magnesium-rare earth alloy, and belongs to the field of alloy preparation. The invention aims to solve the problem that the high-temperature creep property is sacrificed while the room-temperature strength is improved by the conventional grain refining process. The method comprises the following steps: 1, sequentially carrying out solid solution heat treatment and boiling water quenching on the WE43 alloy; secondly, the upper surface of the WE43 alloy plate is plated with a FeCoCrNi high-entropy alloy film layer through a magnetron sputtering method; and 3, ply rolling. The method is used for improving the high-temperature creep property of the magnesium-rare earth alloy.

An austenitic stainless alloy material that has excellent creep strength and excellent stress relaxation cracking resistance is provided. An austenitic stainless alloy material according to the present disclosure contains, in mass %, C: 0.03 to 0.12%, Si: 0.05 to 2.00%, Mn: 0.05 to 3.00%, P: 0.03% or less, S: 0.010% or less, Ni: 18.0 to less than 25.0%, Cr: 22.0 to less than 30.0%, Co: 0.04 to 0.80%, Ti: 0.002 to 0.010%, Nb: 0.1 to 1.0%, V: 0.01 to 1.00%, Al: 0.001 to less than 0.030%, and N: 0.10 to 0.35%. The number density of precipitates having an equivalent circular diameter of 0.5 to 2.0 μm is 5000 pieces / mm2 or more.

The invention discloses a method for improving creep resistance of a rare earth magnesium alloy, which comprises the following steps: S1, casting an ingot blank according to the mass percent of each component (0-6% of Y element, 1-3% of Nd element, 0.1-0.5% of Zr element and the balance of Mg element) in the rare earth magnesium alloy; s2, the ingot blank is subjected to solution treatment; s3, the material obtained after solution treatment is subjected to rolling deformation, the rolling deformation temperature ranges from 450 DEG C to 520 DEG C, the reduction rate ranges from 15% to 25%, and the roller linear speed ranges from 2 mm / s to 200 mm / s; and S4, the rolled and deformed material is subjected to aging treatment, the aging treatment temperature ranges from 180 DEG C to 260 DEG C, and the aging treatment time ranges from 5 h to 70 h. According to the method disclosed by the invention, an originally harmful and unavoidable precipitation-free zone formed along a grain boundary is converted into a precipitation-free zone which is beneficial to creep resistance and is uniformly distributed along an intragranular deformation zone, and the creep resistance is remarkably improved.

Provided is an austenitic heat-resistant steel having excellent creep rupture strength and excellent creep rupture ductility. The austenitic heat-resistant steel has a chemical composition comprising, in terms of mass%, 0.01-0.40% C, up to 3.00% Si, up to 3.00% Mn, up to 0.100% P, up to 0.100% S, 20.0-35.0% Cr, 20.0-48.0% Ni, 0.1-5.0% Mo, 0.01-1.50% Ti, 0.01-0.50% V, up to 0.030% N, up to 0.100% Al, 0.0001-0.0200% B, etc., and has an average austenite crystal grain size of 0.0-5.0 in terms of ASTM No. In the austenitic heat-resistant steel, the Ti, V, and Mo contents and a Ti amount, a V amount, and a Mo amount that are determined from an electrolytic extraction residue satisfy expression (i) and expression (ii).　(i): TiER+VER+MoER≤1.000 (ii): 1.00≤(Ti+V+Mo)-(TiER+VER+MoER)

The preparation method of the high-temperature-creep-resistant nano-composite pressure vessel steel comprises the following steps that a lead sulfide precursor is dissolved in an organic solvent, and heating reaction is conducted under the inert gas condition to generate lead sulfide quantum dots; mixing quantum dots with amphiphilic molecules, and performing ultrasonic emulsification to form a quantum dot colloidal solution; mixing the quantum dot colloidal solution with supercritical carbon dioxide to form a homogeneous fluid phase; the steel matrix is placed in a high-pressure reaction kettle, the homogeneous fluid phase is introduced, permeation is conducted for 2-4 h under the conditions that the pressure is 10-15 MPa and the temperature is 50-70 DEG C, and a steel billet is obtained; the steel billet is placed in hot isostatic pressing equipment, heat preservation and pressure maintaining are conducted for 1-2 h in the inert gas environment under the conditions that the pressure ranges from 150 MPa to 200 MPa and the temperature ranges from 800 DEG C to 900 DEG C, and then the steel billet is cooled to the room temperature; semiconductor quantum dots are introduced into a metal matrix, atomic-scale interface strengthening is achieved through the quantum effect and the supercritical fluid permeation technology, and the steady-state creep rate of the material at the temperature of 600 DEG C can be reduced to 1 / 10 of that of a traditional process by combining the microcosmic strengthening advantage of the quantum dots and the macroscopic permeation advantage of supercritical fluid.

The invention belongs to the technical field of aluminum alloys, and particularly relates to a high-strength and high-toughness microalloyed Al-Cu-Mg alloy with good creep property as well as a preparation method and application of the high-strength and high-toughness microalloyed Al-Cu-Mg alloy. The preparation method of the microalloyed Al-Cu-Mg alloy comprises the following steps that raw materials are weighed and fully mixed; performing vacuum drying after mixing; a micro-alloyed Al-Cu-Mg alloy is prepared by adopting a selective laser melting technology; the raw materials comprise, by mass, 96% of Al-Cu-M alloy powder, 1%-2% of Si powder and 1%-2% of Zr powder. Based on Si-Zr composite microalloying, the alloy which is free of obvious hot cracks and high in compactness is prepared through the selective laser melting technology at the high scanning speed, and the double-peak grain structure of the alloy is promoted to be further refined or transformed into a fine equiaxed crystal structure, so that the strength plasticity and creep property of the aluminum alloy are obviously improved.

The invention discloses a method and a device for predicting spatial and temporal distribution characteristics of a microstructure of a nickel-based single-crystal high-temperature alloy under creep-oxidation interaction, and belongs to the technical field of high-temperature structural material service performance prediction.The method comprises the following steps: performing creep tests of different temperatures, stresses and durations based on vacuum and atmospheric environments respectively; obtaining microstructure morphology characteristics and microscopic parameter distribution in the nickel-based single crystal superalloy under different environments and test conditions; quantifying the spatial-temporal distribution evolution law of the volume fractions of gamma'phases in the creep samples under different temperatures and stresses in vacuum and atmospheric environments; establishing a periodic cell element model and a microstructure evolution model; and predicting the spatio-temporal evolution law of the channel width of the gamma-phase matrix in the stress creep sample at different temperatures in the atmospheric environment. According to the method, spatial and temporal distribution of the microstructure caused by interaction of creep and oxidation is considered, a microstructure evolution behavior prediction framework is constructed in combination with a physical mechanism, and the distribution rule of the microstructure is accurately described.

The application belongs to the technical field of heat-resistant magnesium alloy materials, and more particularly relates to a high-creep-resistance Mg-Al-Ca-Mn magnesium alloy and a preparation method and application thereof. The application provides a Mg-Al-Ca-Mn magnesium alloy preparation method capable of considering cast structure refinement and densification, grain boundary second phase stabilization, matrix solute content improvement and intracrystalline dispersion precipitation strengthening by utilizing extrusion casting to provide a refined and dense initial organization basis, utilizing first-stage solid solution treatment to reduce the coarsening and fracture tendency of the grain boundary second phase in the subsequent high-temperature solid solution process, utilizing second-stage solid solution treatment to improve the matrix solute content, and forming intracrystalline fine and dispersed precipitated phases through aging treatment. Through the synergistic cooperation among the treatment processes, the synergistic creep resistance effect of grain boundary strengthening and intracrystalline strengthening is realized, the creep resistance performance of the alloy is significantly improved, and the prepared magnesium alloy is suitable for preparing lightweight structural parts serving under medium-high temperature load conditions.