116 results about "Tissue inhomogeneity" patented technology

The invention belongs to the field of metal part manufacturing, and particularly discloses a metal part manufacturing system and method adopting the micro-casting-forging and milling-grinding in-situcomposite. The system involves a micro-casting-forging module, a milling module, a five-axis linkage workbench and a control device, wherein the micro-casting-forging module is connected with the milling module and comprises a fusion deposition sub-module and a roller-pressing rolling sub-module, the five-axis linkage workbench is positioned below the micro-casting-forging module and the milling module, and is used for containing metal parts to be formed, and the control device is connected with the fusion deposition sub-module, the roller-pressing rolling sub-module, the milling module and the five-axis linkage workbench. According to the system and method, micro-casting-forging and a milling process are composited to process and manufacture the metal parts, so that the problems that whenthe metal parts are made through the additive manufacturing, the structure is not uniform, the deformation is serious, the residual stress is large, the structure performance is poor, and the surfacequality is poor are solved, and the system and method is especially suitable for processing a high-performance complicated special-shaped element.

The invention provides an ultrahigh-strength rare earth-magnesium alloy board and a preparation method thereof, relating to a magnesium alloy board and a preparation method thereof. By the invention, the problems of rough grains, non-uniform structure and poor performance of the magnesium alloy board prepared by the existing rolling method are solved. The ultrahigh-strength rare earth-magnesium alloy board is prepared from the components in percentage by mass: 2.0-17.0% of Gd, 3.0-18.0% of Y, 0.5-3.5% of Zn, 0.1%-1.5% of Zr and 76.0-94.0% of Mg. The preparation method comprises the following steps of: firstly preparing a rare earth-magnesium alloy cast ingot by sand casting, metal casting or semi-continuous casting; then homogenizing and annealing, cutting into rolling blanks, and then carrying out breakdown rolling to obtain a rolled board; and finally aging to obtain the ultrahigh-strength rare earth-magnesium alloy board. The preparation method provided by the invention is mainly used for preparing ultrahigh-strength rare earth-magnesium alloy boards.

The invention provides a preparation method for a TiAl alloy plate of a uniform structure and relates to the preparation method for the TiAl alloy plate. The preparation method for the TiAl alloy plate of the uniform structure aims at solving the problems that the structure of an existing TiAl alloy plate is nonuniform, and the comprehensive performance is reduced. The preparation method comprises the steps that 1, blank preparing is conducted to obtain a cuboid TiAl alloy rolling blank; 2, sleeving is conducted to obtain a sleeved TiAl alloy blank; 3, double-step heat treatment is conducted before high-temperature rolling to obtain a TiAl alloy blank subjected to double-step heat treatment; 4, high-temperature rolling and heat preserving during passes are conducted to obtain a TiAl alloy plate subjected to high-temperature rolling; 5, stress relief annealing is conducted to obtain an annealed TiAl alloy plate; and 6, a sleeve is removed through machining, so that the TiAl alloy plate is obtained. The preparation method for the TiAl alloy plate of the uniform structure has the advantage that the TiAl alloy plate of the uniform structure is obtained by adopting double-step heat treatment before rolling. The preparation method is mainly used for preparing the TiAl alloy plate of the uniform structure.

Provided are boron-containing weather-proof thin strip steel and a manufacturing method thereof. The manufacturing method comprises performing double roller thin strip continuous casting to produce boron-containing weather-proof steel; after a cast strip is processed through a crystallizing roller, adopting a mode of spraying dry ice to perform uniform strengthened cooling on the cast strip, cooling the cast strip to below 1,280 DEG C, and enabling the cooling speed to be 200-300 DEG C / s, so that precipitation of thick and large BN is promoted, emergency of low-melting-point-phase B203 and precipitation of tiny AlN are avoided, and the aims of homogenizing austenite grains and reducing yield ratio are achieved; then performing austenite on-line recrystallization rolling; then performing atomization cooling on the strip steel undergoing hot rolling, and enabling the cooling temperature to be 10-70 DEG C / s; and enabling coiling temperature to be 650-750 DEG C. Steel with low yield ratio can be obtained through the manufacturing method, and the problems that steel produced by thin strip continuous casting are universally uneven in structure, high in yield ratio and difficult to form and cannot meet the requirements for cold rolling materials are effectively solved.

The invention relates to super-thick steel and a heating process thereof, in particular to super-thick high-level boat plate steel and a normalizing process thereof. The super-thick steel comprises the following components by weight percent: 0.06% to 0.18% of C, 1.00% to 1.60% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.005% of S, smaller than or equal to 0.35% of Si, 0.03% to 0.30% of Ni, 0.03% to 0.20% of Cr, 0.02% to 0.25% of Cu, 0.020% to 0.050% of Alt, 0.010% to 0.040% of Nb, 0.003% to 0.060% of V and the balance of Fe. The normalizing temperature ranges from 880 DEG C to 940 DEG C; the temperature keeping time ranges from 0.8H minutes to 1.5H minutes, wherein H is the thickness of a steel plate; and the cooling speed is from 1 DEG C / S to 5 DEG C / S. The defects of nonuniform internal and external structures, obvious performance fluctuation, and the like in the rolling process of the super-thick plate are eliminated by normalization, thereby the productquality is improved, the product competitiveness is enhanced and the defects of the structure of the super-thick high-level boat plate steel are eliminated.

The invention relates to steel made of boron containing microalloy and resisting atmosphere corrosion, and a manufacturing method of the steel. Steel containing boron and resisting atmosphere corrosion is produced through twin-roll thin strip continuous casting, a crystal roll produced through strip casting is sprayed with dry ice, cast strips are uniformly cooled in an strengthened manner, and are cooled below 1,280 DEG C quickly, the cooling rate is 200 to 300 DEG C / s, the strip steel subjected to boronizing is cooled in such a cooling way to promote the separation-out of thick and large BN (Boron Nitride), prevent the occurrence of low-melting-point B2O3 and the separation-out of fine ALN and achieve the purposes of uniforming austenite crystals and reducing the tensile ratio; and then, austenite is subjected to on-line recrystallization rolling, atomoization cooling and coiling. Through the invention, the steel with lower tensile ratio can be manufactured, the problems of steel produced through strip casting that the structure is non-uniform, the tensile ratio is higher, the moulding is difficult, and the requirement of cold rolled material cannot be met are effectively solved, the use requirement of cold rolled base materials is met, and the steel can be directly used in a way of replacing the cold rolling by the hot rolling.

The invention relates to boron-containing micro-alloy weather resisting steel and a manufacturing method thereof. The boron-containing weather resisting steel is continuously cast by a twin-roll thin strip, a cast strip is uniformly reinforced and cooled by spraying dry ice after exiting a crystallization roll, the cast strip is rapidly cooled to the temperature lower than 1280 DEG C at the speed of 200-300 DEG C / s, precipitation of thick BN can be promoted in the cooling mode, B2O3 with a low melting point and precipitation of thin AlN are prevented, accordingly, austenite crystal grains are homogenized, and the yield ratio is reduced. Online austenite recrystallization rolling and anti-oxidation rapid cooling at the speed of 80-200 DEG C / s are performed, and the coiling temperature is 500-600 DEG C. The steel with the low yield ratio can be obtained, and the ubiquitous problem that steel continuously cast by a thin strip is inhomogeneous in structure, high in yield ratio, difficult in forming and incapable of meeting the requirement of cold rolling of materials is solved.

The invention provides an aluminum alloy strip for a mobile phone battery shell and a manufacturing method thereof, relates to an alloy strip and a manufacturing method thereof, and solves the problems of low tensile strength, high elongation after breakage and high earing rate of a conventional 3003-H14 aluminum alloy strip applied to the mobile phone battery shell, and uneven grain structures of alloys prepared by the conventional manufacturing method. The aluminum alloy strip is made from Si, Fe, Cu, Mn, Mg, Zn, Ti and Al. The tensile strength of the aluminum alloy strip is between 190MPa and 210MPa, the elongation after breakage of the aluminum alloy strip is between 2.0 and 4.0 percent, and the earing rate of the aluminum alloy strip is between 3 and 4 percent. The manufacturing method comprises the following steps of: mixing the materials; melting, casting, homogenizing annealing, hot rolling, and cold rolling to obtain the aluminum alloy strip for the mobile phone battery shell. The aluminum alloy strip for the mobile phone battery shell can improve the strength of the mobile phone battery shell and reduce wall thickness at the same time so as to improve the capacity of the battery shell.

Provided is a process for preparing an ultra-fine / nanometer W-Cu-Ni composite powder. Firstly according to the proportion of W-Cu-Ni ingredients, relative metal salt is prepared to mixed salt solution with a concentration of 10-30wt% percents, a small amount of acids are added to control the pH, and surfactant gels are added to control particles in solution to reunite, thereby obtaining a mixed salt sol colloid of a homogeneous system. The mixed salt sol colloid is sprayed, dried, burned, and two-stage or multi-stage reduction is applied between 150 and 900 DEG C and under H2 atmosphere, and the ultra-fine / nanometer W-Cu-Ni composite powder is obtained. By adopting the ultra-fine / nanometer W-Cu-Ni composite powder prepared by the invention, the proportion of ingredients can be adjusted, and the proportion of ingredients of each element in powder is capable of being adjusted according to the requirement of alloys property. The powder has good coking characteristic, the density of alloys is high, and the characteristic that inhomogeneous organization when the content of CU is high in W-Cu alloys system is overcome.

The invention relates to a preparation method of a high-performance TiAl alloy plate. The preparation method of the high-performance TiAl alloy plate aims at solving the problems that in the hot rolling process of existing TiAl alloy, due to the crystal grain growth, the nonuniform structure and stress concentration, a plate is cracked, the solid solution heat treatment process is tedious after rolling, the comprehensive performance of a TiAl alloy plate is lowered, and particularly plasticity is obviously lowered. The preparation method comprises the first step of preparation of TiAl alloy blank, the second step of sheathing, the third step of first-stage high-temperature rolling, the fourth step of second-stage high-temperature rolling, the fifth step of third-stage high-temperature rolling and the sixth step of mechanical machining and sheath removing. By means of the preparation method, crystal grains are thinned, the structure is made uniform, the plate is prevented from being cracked in the rolling process, the high-temperature deformation ability of the TiAl alloy plate is improved, and the large-size TiAl alloy plate with the excellent performance can be obtained.

A diffusion connection method of carbide ceramic relates to a carbide ceramic welding method. The diffusion connection method aims at solving the problem that when a metal middle layer is used for connecting the carbide ceramic and composite ceramic, a residual metal middle layer is formed in a welded joint, and the structure of the welded joint is inhomogenous. The diffusion connection method comprises the steps of: 1, carrying out surface cleaning; 2, electroplating a Ni metal layer; and 3, welding, thus completing the diffusion connection of the carbide ceramic. The diffusion connection method has the advantages that 1, the welded joint without the residual middle layer and with the homogeneous structure is formed, the welding residual stress caused by the residual middle layer in a common diffusion welding joint is relieved, the room-temperature mechanical property of the welded joint is increased, and the high-temperature mechanical property and oxidation resistance of the welded joint are also increased; and 2, the diffusion connection method is simple and practicable without needing complex working procedures and equipments. The diffusion connection method of the carbide ceramic, provided by the invention, is mainly used for diffusion welding of the carbide ceramic.

The invention relates to a tungsten-copper composite material, wherein tungsten and copper are mutually clad and through, and the tungsten-copper composite material comprises the following components in percentage by weight: 60-90 percent of tungsten and the balance of copper. A preparation method of the tungsten-copper composite material comprises the following steps of: washing a tungsten filament with acid, cleaning, and carrying out three-dimensional or two-dimensional braiding to obtain a tungsten filament braided body; placing a copper material into a graphite container, placing the obtained tungsten filament braided body on the copper material, and holding a temperature of 1200-1350 DEG C for 0.5-2h under a vacuum environment with the vacuum degree being larger than 1*10<-3>Pa; cooling to the room temperature in a furnace, and then removing redundant copper from the surface of the obtained green body to obtain the tungsten-copper composite material. The tungsten-copper composite material prepared with the preparation method has the advantages of avoiding the problem of nonuniform texture caused by nonuniform mixing of tungsten and copper alloy prepared by applying a traditional process.

The invention discloses a preparation method for a copper-niobium composite rod for an Nb3Sn superconducting wire with high critical current density. The method comprises the following steps of firstly, processing an oxygen-free copper rod into an outer hexagonal inner-circle thin-wall copper pipe; secondly, placing an Nb rod into the hexagonal copper pipe, placing the hexagonal copper pipe into an oxygen-free copper sheath, placing the oxygen-free copper rod at the central zone of the oxygen-free copper sheath and sealing to obtain a CuNb composite sheath; and lastly, carrying out heating, thermal insulation and extrusion on the CuNb composite sheath to obtain the CuNb composite rod. According to the method, the Nb rod with the fine initial grain size is placed into the hexagonal thin-wall copper pipe to carry out assembly, welding and extrusion to obtain the CuNb composite rod, so that the processing of a CuNb single rod is removed, and the problems of line breakage and core breakage after stretch in the subsequent processing process of the superconducting wire, which are caused by uneven texture after extrusion due to the coarse initial grain size of an Nb ingot, are solved, the efficiency is improved and the quality risk of the processing process is reduced.

The invention discloses a high-end anodic oxidation aluminum strip for the 3C (computer, communication and consumer electronic) industry and a production method of the high-end anodic oxidation aluminum strip. Chemical alloy elements of the aluminum strip comprise Si, Fe, 0.04-0.08% of Cu, Mn, 2.3-2.5% of Mg, Cr, Zn, 0.008-0.012% of Ti and the balance Al, wherein the percent of Si is smaller than or equal to 0.03%, the percent of Fe is smaller than or equal to 0.05%, the percent of Mn is smaller than or equal to 0.01%, the percent of Cr is smaller than or equal to 0.01%, and the percent of Zn is small than or equal to 0.01%. The production method includes: smelting the aluminum alloy elements to obtain aluminum alloy ingots by casting; subjecting the aluminum ingots to end sawing and surface milling; performing soaking and heating treatment; sequentially carrying out cold rough rolling and hot finish rolling; subjecting aluminum alloy coils to intermediate annealing or stabilization treatment, and finally cleaning, dividing and packaging. By the aluminum strip produced according to the production method, quality problems of high internal hydrogen content, texture nonuniformity, surface black lines, streaks and the like in production of aluminum alloy strips for electronic appliances in the prior art can be solved effectively.

The invention belongs to the technical field of high-temperature alloy die forging, and particularly relates to a high-temperature alloy turbine disc forge piece organization and performance thermal machining method. A performing die forging plus bearizing plus die forging method includes the steps that the specification and size of the wild shape required by finish forging are determined, a finish forging die and a performing die forging die are prepared, performing die forging is conducted, bearizing is conducted till the wild shape required by the finish forging is formed, and the finish forging is conducted; an annular blank is determined according to the forge piece shape to serve as the wild shape; first-fire forging of a titanium alloy bar is forged through the performing die, and the heating number integrates traditional upsetting, punching and saddling processes; preformed forge piece core materials generated after forming die forging is conducted are removed; bearizing is conducted on a performing forge piece till the wild shape size required by finish forging is formed; one-fire finish forging is conducted till forming is finished. According to the method, the problems that the final forge piece of the high-temperature alloy turbine disc forge piece is uneven in organization and residual stress due to the blank making process of more heating numbers and smaller deformation are avoided.

The invention discloses a crystalline grain control method for a GH690 alloy shear cover of an explosion valve and belongs to the technical field of material machining. The method aims to solve the problems that the structure of a forge piece of the GH690 alloy material shear cover of the explosion valve is not even, and crystalline grains abnormally grow up. A heat treatment machining is organically combined with a forging machining, and the machining method that large deformation free forging is implemented at a high temperature (1020 DEG C to 1150 DEG C), small deformation foetal die forging is implemented at a medium temperature (710 DEG C to 850 DEG C), and the inhibition function of carbide second-phase particles on moving of a grain boundary is used for restraining the abnormal growth of the crystalline grains in forging machining of the shear cover in an auxiliary mode is provided. According to the crystalline grain control method for the GH690 alloy shear cover of the explosion valve, the forging piece forming and crystalline grain refinement are conducted synchronously, and the shear cover forge piece is obtained through heating twice; the machining limitation that a forging piece with the simple structure is subjected to high-temperature multiple-time hierarchical forging machining at present is overcome; the forging heating number is reduced; the follow-up heating treatment of the forging piece of the GH690 nickel-based alloy sheer cover is avoided. The structure with even carbides and refined crystalline grains of the GH690 alloy shear cover of the explosion valve forged through the method can be obtained.

The invention provides a preparation method of a tantalum 2.5 tungsten alloy. The preparation method comprises the following steps: after preparing tantalum powder and tungsten powder in proportion, putting the powder into a drum mixer to be mixed for 24 hours; sieving the mixed powder with a 120-mesh sieve to obtain fine powder; pressing the fine powder into an alloy bar with a 500ton oil press; putting the alloy bar into a vacuum sintering furnace to be sintered to obtain a raw ingot blank; smelting the raw ingot blank at least twice with a vacuum electron beam furnace to prepare an alloy ingot blank; putting the alloy ingot blank into a high frequency furnace to be heated to 1400 DEG C, then taking out the alloy ingot blank and forging the alloy ingot blank for many times, thus obtaining a finished product of ingot blank. The preparation method has the beneficial effects that through full mixing of tantalum powder and tungsten powder and many times of smelting, the problem of nonuniformity of ingot blank tissues is solved and the problems that the blanks easily fall off and become brittle are improved.

The invention discloses a Ti2AlNb-based alloy fusion welding joint heat treatment process, wherein the steps for carrying out after-welding heat treatment on a Ti2AlNb-based alloy fusion welding joint comprise: heating to achieve a three-phase region (O+[alpha]2+B2), carrying out thermal insulation until the structure change is uniform, and carrying out furnace cooling; and using three-phase region (O+[alpha]2+B2) high temperature annealing to adjust the composition, the size and the grain boundary morphology of the precipitated phase in the joint structure, and eliminate the welding joint residual stress. According to the present invention, the problems that the structure of the intermetallic compound Ti2AlNb-based alloy fusion welding joint is not uniform and the comprehensive mechanical property is poor can be solved; with the after-welding heat treatment method, the welding joint structure can be improved, and the joint room temperature and high temperature comprehensive mechanical properties can be improved so as to obtain the high quality welding joint; and the Ti2AlNb-based alloy fusion welding joint heat treatment process is mainly used for the after-fusion welding heat treatment process of the intermetallic compound Ti2AlNb alloy.

A technology for eliminating the mix-crystal structure of the Nb microalloyed steel manufactured by EAF-CSP flow features that the reasonable technological flow and chemical components, and reasonable technological steps including conticasting, soaking, removing scales, hot rolling and coiling are used.

The invention discloses a method for coating a surface of reinforcement in a composite material, and relates to a method for coating a surface of reinforcement. The method can be used for solving the problems of coated tissue non-uniformity, poor compactness and coverage incompleteness in the conventional method for coating the surface of the reinforcement. The method comprises the following steps: 1, mixing reinforcement with metal powder, and obtaining mixed powder after ultrasonic cleaning; 2, pouring the mixed powder into distilled water or a salt solution, heating, coating, and then taking out the reinforcement; and 3, sintering the reinforcement. According to the method for coating the surface of the reinforcement in the composite material, a netlike structural coating is uniformly covered on the surface of the coated reinforcement, and the coating has small and compact tissues; and in the later composite material preparation process, the wetting property between the reinforcement and a substrate is greatly promoted, and the interface reaction between the reinforcement and the substrate is effectively controlled. By utilizing the method for coating the surface of the reinforcement in the composite material, the surface state of the reinforcement can be preferably regulated, and a technical guarantee is provided for the later prepared composite material to achieve excellent mechanical property.

The invention relates to a method for controlling cooling after a forging steel part is forged, and belongs to the field of steel forging and heat treatment. The method is characterized in that a forged workpiece is immerged into a uniform-speed cooling medium for cooling; a cooling process takes the fact that a non-equilibrium state structure is not generated on a surface as a principle and can adopt a cooling mode of cooling to proper temperature and then equalizing the temperature or other cooling modes according to the size of a material and a workpiece. The method for controlling cooling after forging, which is disclosed by the invention, can solve the problems of rough and large structure, hereditary structures, such as a banded structure, and structure nonuniformity of the traditional forging stock, ensure the rigidity uniformity of the forging stock, impulse the popularization of a dry cutting technology, improve the mechanical properties, namely anisotropy, impact ductility and the like of a product which is subjected to heat treatment, improve the uniformity of a structure which is not subjected to the heat treatment and effectively cooperate with the heat treatment deformation control.

The invention relates to alloy steel for a high-pressure container. The alloy steel comprises the following components in percentage by weight: 0.27 to 0.33 percent of C, 0.60 to 1.00 percent of Mn, 1.40 to 1.70 percent of Si, less than or equal to 0.003 percent of S, less than or equal to 0.006 percent of P, 0.80 to 1.20 percent of Cr, 0.30 to 0.50 percent of Mo, 0.10 to 0.15 percent of V and the balance of Fe and inevitable impurities, wherein the total content of impurity elements and gas, namely, S+P+H+O+N is less than or equal to 100 ppm. In the smelting process of the invention, the form of electric furnace or electric furnace and electroslag remelting is replaced by the form of vacuum induction furnace and consumable electrode vacuum furnace, so that the problem of low toughness, particularly low fracture toughness caused by the low impurity of an original type of steel; in a processing procedure, high-speed forging or steam hammering of which the processing ratio is more than 5 is replaced by high-speed forging and radial forging of which the processing ratio is more than 10, so that the problems of non-uniform grain size and structure caused by non-uniform forging of the original type of steel are solved; and in a thermal refining process, the form of quenching and high temperature tempering is replaced by the form of quenching and low temperature tempering, and the sorbite structure of the original type of steel is replaced by a martensite structure, so that the problem of insufficient intensity is solved.

The invention discloses a forging process method of TI2AlNb alloy large-size disk parts. The forging process method optimizes the base technical parameters of thermal deformation of alloy according to the optimal deformation and organization control conditions of the alloy, by reasonable control to heating modes, heating temperature, forging deformation rate and deformation degree of blanks as well as final optimization of post-forming thermal treatment schedules, effectively solves the problems of crack proneness, uneven organization and the like during the forging process due to temperature rise and drop differences and uneven deformation of every parts, and accordingly can be applied to forging the large-size disk parts. The forging process method of the TI2AlNb alloy large-size disk parts sets norms and standards for alloy blank forging processes, can guarantee that the forged TI2AlNb alloy large-size disk parts are intact in appearance and has no defects such as cracks, the size allowance of the TI2AlNb alloy large-size disk parts can meet the machining requirements, the chemical components and the mechanical properties of the TI2AlNb alloy large-size disk parts can meet the design requirements. Therefore, the forging process method of the TI2AlNb alloy large-size disk parts is very applicable to popularization in application of large-size disc-shaped structural parts.

The invention provides a cable type welding wire which is used in the field of high-entropy alloy preparation. The cable type welding wire comprises a central welding wire body and a plurality of encircling welding wire bodies, wherein the encircling welding wire bodies are spirally wound and twisted around the central welding wire body, and the adjacent encircling welding wire bodies are tangentially connected; the diameter of the encircling welding wire bodies is equal to or less than that of the central welding wire body, and the number of the encircling welding wire bodies is three or more; raw materials of the encircling welding wire bodies and the central welding wire body are selected according to a formula of a high-entropy alloy; and the raw materials comprise metal wires. The invention also provides a method for preparing high-entropy alloy parts by using the cable type welding wire. With the method, the problems of high cost, low preparation efficiency, inconvenient adjustment of alloy components, uneven chemical composition and structure, and high rate of defects such as air holes, cracks, slag inclusion, gaps and shrinkage holes in the prior art are solved.

The invention discloses a production process of an aluminum alloy plate for a notebook computer. The production process comprises the following steps: controlling the chemical components of a cast ingot; uniformly heating the cast ingot, heating the cast ingot to 470-500 DEG C, and keeping the temperature for 10-50 hours; heating the cast ingot; hotly rolling raw materials; cutting; coldly rolling; straightening; sawing; and packing. The control of the chemical components of the cast ingot comprises the steps of controlling the Mg content in aluminum alloy to be 2.2-2.4%, the Cr content to be 0.15-0.20% and the use amount of a waste material in the aluminum alloy to be less than 35%, and adding a grain refiner in a casting process of the cast ingot. Compared with an existing production process, the production process has the advantages that the internal organization macro-segregation of the cast ingot is reduced, the content of impurities is effectively controlled, the production amount and size of a difficultly soluble interphase of the casting process are reduced, and the good effects in refining grains and controlling coarse compounds are achieved. The production process realizes the uniform control of large-scale cast ingot components and solves the problem that the internal organization of the aluminum alloy plate is non-uniform.

The invention belongs to the technical field of titanium alloy disk die forging and relates to a die forging method for a titanium alloy disk. The method is a hot machining method capable of improving organization and performance of variable-cross-section titanium alloy disk forgings. According to the method, a forging die and a tool special for secondary-heating are designed and manufactured according to a variable-cross-section structure of titanium alloy die forgings, and cavities matched with the forging die and the tool special for secondary heating correspond to the shapes of the forgings; titanium alloy bars are prepared into annular blanks through an ordinary method; die forging first-heating is completed through an ordinary die, and ring blank positioning and preliminary forming are achieved; and in the secondary-heating production process, the tool special for secondary heating is placed in a lower die body of the ordinary die, then forging is conducted, and final forming of the blanks is completed. By means of the die forging method for the titanium alloy disk, the problems that precious metal is wasted, the filling effect of the forgings is poor, and the final forgings are uneven in organization, substandard in flaw detection and poor in fracture toughness due to multiple heating times and smaller deformation when aircraft engine titanium alloy fan disk forgings are forged through the a traditional die are avoided.

The invention provides a die forging forming technology for a GH4169 alloy forge piece to solve the problems that when a hydraulic machine or a counter-blow hammer is utilized for carrying out die forging on the GH4169 alloy forge piece in the prior art, the forge piece is poor in stability and uneven in tissue, and large-depth mixed crystals exist on the surface of the forge piece. The die forging forming technology comprises the first step of feeding bar stock, the step of heating the bar stock to manufacture a blank, the step of carrying out heating and thermal insulation on the manufactured blank before forging, the step of carrying out die forging forming on the blank on which heating and thermal insulation are carried out before forging, and the step of carrying out heat treatment on the die forging formed forge piece. The die forging forming technology is characterized in that a high-power screw press is utilized for carrying out die forging forming on the blank heated before forging.

The invention provides a preparation method of a tantalum 10 tungsten alloy. The preparation method comprises the following steps: after preparing tantalum powder and tungsten powder in proportion, filling the powder into a drum mixer to be fully mixed and screening the powder to obtain fine powder; pressing the fine powder into an alloy bar with a 500ton oil press; putting the alloy bar into a vacuum sintering furnace to be sintered to obtain a raw ingot blank; smelting the raw ingot blank at least twice with a vacuum electron beam furnace to prepare an alloy ingot blank; putting the alloy ingot blank into a high frequency furnace to be heated to 1400 DEG C, then taking out the alloy ingot blank and forging the alloy ingot blank for many times, thus obtaining a finished product of ingot blank. The preparation method has the beneficial effects that through full mixing of tantalum powder and tungsten powder and many times of smelting, the problem of nonuniformity of ingot blank tissues is solved and the problems that the blanks easily fall off and become brittle are improved.

The invention discloses a temperature control device and method for additive manufacturing. According to the temperature control device, a front preheating part is arranged at the front end of a printing head, and a rear cooling part is arranged at the rear end of the printing head. Before a formed part enters a printing position, the difference between the surface temperature of the formed part and the temperature of a printing portion can be reduced, and the frequency of the phenomenon that due to the large temperature difference, the organizations of the formed part are not uniform can be reduced. Due to the fact that the rear cooling part is arranged behind the printing head, the formed part can be rapidly cooled by the cooling gas after printing is accomplished, the situation that dueto the fact that the temperature is too high, the formed part is oxidized by the surrounding air is avoided, and the surface quality of the formed part is improved. According to the temperature control system and method for additive manufacturing, on the basis of control over the temperature of a molten pool in the additive manufacturing deposition process and the cooling speed in the solidification process, the front preheating device and the rear cooling device are added, and therefore zone control of the temperature field of the formed part is achieved, the forming defect is avoided, the distribution of the temperature field in the additive manufacturing process is improved, and the internal property of the formed part can be improved.