1416 results about "Plasticity" patented technology

The invention discloses preheating-free welding maritime work steel with excellent low-temperature toughness and a preparation method of the preheating-free welding maritime work steel, and belongs to the field of steel and iron material preparation. The produced steel plate has good comprehensive mechanical properties through alloy component-secondary rolling-controlled cooling process coupling design, the problem that the strength, plasticity, low-temperature toughness and preheating-free post-welding performance of the steel plate are difficult to match and harmonize is solved, the steel plate has ultrahigh-strength plasticity, excellent low-temperature toughness and excellent Z-direction performance, and room-temperature preheating-free welding can be achieved.

The invention belongs to the field of advanced metal plastic processing, and particularly relates to a difficult-to-deform metal ultra-thin strip rolling device and method.The device comprises an uncoiler, a high-strength rolling mill and a coiler which are sequentially arranged, and the inlet side and the outlet side of the high-strength rolling mill are each provided with a pair of equal-diameter rollers; the equal-diameter roller is composed of a copper conductive roller and a ceramic insulating roller, the copper conductive roller on the inlet side and the copper conductive roller on the outlet side are electrically connected to the positive electrode and the negative electrode of the pulse power source respectively, and a strip blank on the uncoiling machine sequentially penetrates through the equal-diameter roller on the inlet side, the high-strength rolling mill and the equal-diameter roller on the outlet side and then is wound on the coiling machine. And a working roll, which is in contact with the strip blank, on the high-strength rolling mill is an insulating ceramic working roll. The pulse current in the method can induce dynamic recrystallization, an ultra-fine grain or nanocrystalline structure is obtained, and the strength and plasticity matching of the product is superior to those of a traditional process. Meanwhile, long-time high-temperature oxidation can be avoided by adopting pulse current to heat the strip blank, and the surface is bright.

The invention discloses an Al-Mg-Zn aluminum alloy plate with excellent strong plasticity and light weight characteristics as well as a preparation method and application of the Al-Mg-Zn aluminum alloy plate. The alloy comprises the following components in percentage by mass: 5.0%-5.5% of Mg, 1.5%-2.0% of Zn, 0.4%-0.5% of Mn, 0.1%-0.3% of Cu, 0.15%-0.25% of Sc, 0.1%-0.15% of Zr, 0.05%-0.15% of Ag, less than or equal to 0.1% of impurities and the balance of Al. The density is not more than 2.63 g / cm < 3 >, the tensile strength is not less than 470 MPa, and the ductility is not less than 23%. The preparation method comprises the steps of high-purity raw material smelting and casting, two-stage homogenization, hot rolling, intermediate annealing, cold rolling, solid solution treatment and single-stage aging. Wherein the total pressing amount of hot rolling is 80-85%, the total pressing amount of cold rolling is 20-35%, and the single-stage aging time is 120-140 DEG C * 16-24 h. The microstructure of the alloy is characterized in that the average size of dispersed AlSc particles is smaller than or equal to 100 nm, the area fraction of deformed grains is larger than or equal to 70%, the average size of nanometer beta-AlMg and T-Mg (Al, Zn) composite precipitated phases is smaller than or equal to 20 nm, the number density is larger than or equal to 1 * 10 < m >, the area fraction of micron-order second phases is smaller than or equal to 0.5%, and the alloy is only formed by impurity Fe. According to the method, the traditional two-stage aging process is simplified, low density, high strength and high plasticity are synchronously improved, and the method is suitable for large-scale industrial application.

The invention relates to a forging method of a high-strength, high-creep-resistance and high-structure-stability Ti1100 alloy bar, belongs to the technical field of titanium alloys, and aims to solve the problems that in the forging process of an existing method, macrosegregation is prone to occurring; at least one of the problems that the process is difficult to control due to narrowing of a machining window, forging is difficult due to great increase of deformation resistance, cracking is caused due to plasticity reduction, and the Ti1100 alloy bar is poor in structure stability and short in service time are solved. According to the forging method of the Ti1100 alloy bar, through one-heating-number blooming forging, one-heating-number grain refinement and homogenization forging and 2-4-heating-number cross-phase region forging, the problem of macrosegregation caused by high alloy element content in the forging process is solved; and the problems that the process is difficult to control due to narrowing of a machining window, forging is difficult due to great increase of deformation resistance, and cracking is caused due to plasticity reduction are solved.

The invention provides a seamless steel pipe for a hollow anchor rod and a strength regulation and control method thereof. Alloy steel round steel is heated and then subjected to hot piercing to be manufactured into a hollow pipe blank; the hollow pipe blank is subjected to spheroidizing annealing treatment and then cooled, and a first treated steel pipe is obtained; wherein the ferrite grain size D1 of the first treated steel pipe is calculated according to a spheroidizing annealing grain size model; the first treated steel pipe is subjected to cold finish rolling forming and cleaned to obtain a second treated steel pipe; the ferrite effective grain size Ddef of the second treatment steel pipe is calculated according to the cold deformation grain refinement model; recrystallizing and annealing the second treated steel pipe to obtain the seamless steel pipe; the ferrite grain size D2 of the seamless steel pipe is calculated according to the recrystallization grain evolution model; the yield strength Rp0.2 of the seamless steel pipe is calculated according to a strength model; reverse design of the yield strength of the seamless steel pipe is achieved, and meanwhile it is guaranteed that the seamless steel pipe has good plasticity.

The invention belongs to the technical field of metallurgical materials, and discloses austenite-martensite dual-phase steel and a preparation method and application thereof.The austenite-martensite dual-phase steel comprises, by mass, 0.1%-0.3% of C, 10%-20% of Cr, 6%-10% of Ni, 0.5%-1.5% of Al, smaller than or equal to 0.005% of P, smaller than or equal to 0.005% of S and the balance Fe. A basic strength platform is provided through dislocation strengthening, a nano precipitated phase regulates and controls phase transformation kinetics through chemical partition and enhances dislocation storage capacity, the gradual TRIP effect maintains plastic deformation capacity through phase transformation plasticity and secondary hardening, and finally the requirements for the strength and plasticity of the austenite-martensite dual-phase steel are met at the same time. And when the yield strength at the liquid nitrogen temperature exceeds 2 GPa, the plasticity exceeds 20%.

This invention provides a high-strength, high-ductility austenitic stainless steel and its production method. The composition is: C 0.045%-0.085%, N 0.10%-0.40%, Si 0.90%-1.55%, Cr 16%-20.1%, Ni 7.5%-12.5%, Mn 1.5%-3.5%, Mo 1.5%-3.0%, Nb 0.08%-0.22%, Ti 0.015-0.065%, O≤0.005%, P≤0.003%, S≤0.003%, with the remainder being Fe and unavoidable impurities. Compared with existing technologies, this invention obtains a reasonable grain size and second-phase particles through nitrogen, titanium, and niobium alloying, combined with low-temperature rolling and appropriate annealing and aging heat treatment, thus developing an austenitic stainless steel with excellent mechanical properties. It achieves excellent ductility at a high strength level, with a strength-ductility product as high as 60 GPa·s.

The invention relates to the technical field of machining simulation, in particular to a composite material ring piece low-stress machining method based on finite element analysis. The method comprises the following steps: constructing a two-dimensional finite element model of the composite material ring piece; grid division is carried out on the geometric model, and the structure is decomposed into units; setting boundary conditions and loads of the simulation model; defining material attributes including density, thermal conductivity, specific hot melting, elastic modulus, Poisson's ratio, plasticity and creep; setting processing and heat treatment parameters, including processing procedures, processing amount, heat treatment temperature and time; the simulation model is operated, and the response of the geometric model under the given boundary and loading condition is obtained; and analyzing an operation result, summarizing an influence rule of machining parameters and heat treatment setting on machining stress, and optimizing a machining scheme. According to the method, a stable component low-stress machining scheme can be rapidly obtained through an analogue simulation technology for the machining process of the composite material ring piece, and high-precision machining of the large-size fiber reinforced composite material ring piece is achieved.

The invention discloses an ultrahigh-strength maraging steel wire as well as a preparation method and application thereof, and belongs to the field of steel product manufacturing. The steel wire alloy comprises the following components in percentage by weight: 0.02%-0.05% of C, 0.10%-0.35% of Si, 0.20%-0.60% of Mn, 0.60%-2.50% of Cr, 18.5%-22.0% of Ni, 8.0%-13.0% of Co, 1.2%-2.0% of Ti, 3.0%-5.5% of Mo, 0.10%-0.50% of Al, less than or equal to 1.50% of Cu, less than or equal to 1.50% of Nb, less than or equal to 0.05% of V, less than or equal to 0.04% of N, less than or equal to 0.02% of La + Ce and the balance of Fe and inevitable impurity elements. And the equivalence ratio Nieq / Creq of nickel to chromium is greater than or equal to 1.80. The steel wire provided by the invention has ultrahigh strength, excellent toughness and plasticity, wear resistance, heat resistance, drawing performance and bending and twisting performance.

The invention discloses an additive manufacturing method for in-situ regulation and control of a TiB / TiC titanium-based heterostructure through laser deposition, and belongs to the technical field of composite material preparation. According to the method, laser path planning is carried out based on three-dimensional modeling and layered slicing; the preparation method comprises the following steps: ball-milling and mixing titanium alloy powder, nano boron carbide powder and trace rare earth powder according to a specific proportion, and carrying out vacuum drying; and addition of trace rare earth is beneficial to grain refinement and improvement of reinforcement phase distribution and interface bonding. Under the action of a high-energy laser beam, the mixed powder is fused in an argon protective atmosphere, an in-situ reaction is carried out at the same time, and TiB and TiC reinforced phases are generated; the gradient component design can be implemented in the laser deposition process, specifically, the powder feeding proportion of B4C powder is dynamically controlled through a program, the gradient of the B4C powder is increased from the bottom layer to the surface layer in the direction perpendicular to the substrate, and therefore the gradient heterostructure with the enhanced phase content and performance gradually changed is formed. According to the method, the problems of non-uniform reinforcement phase distribution, obdurability mismatch, plasticity loss and the like in a traditional method are solved, the prepared composite material or gradient component has high strength (the tensile strength reaches 987.66 MPa) and good plasticity and toughness matching, no crack defect exists, and the method is suitable for manufacturing of high-performance parts in the fields of aerospace and high-end machine manufacturing.

The invention discloses a preparation method of high-toughness nickel-based alloy composite powder for additive manufacturing. The method comprises the steps that nickel-based alloy matrix powder and nanometer reinforced particles are fed into a forming cavity, under the inert atmosphere and cooling conditions, a spiral blade is driven to rotate at the high speed of 15000-30000 rpm, meanwhile, the pressure in the cavity is maintained to be 2-8 MPa, and treatment is conducted for 30-120 minutes; and through the synergistic effect of kinetic energy and high-speed airflow, combination of size selective milling and cold welding is achieved, and the core-shell structure composite powder with matrix powder evenly coated with nano-reinforced particles is prepared. According to the preparation method, ball-milling-medium-free design is adopted, powder pollution and sphericity deterioration are avoided, and the prepared composite powder has high sphericity and fluidity, is suitable for the laser additive manufacturing process and can effectively refine grains, inhibit element segregation, cooperatively improve the strength and toughness of components and solve the problem of high-plasticity inversion.

The invention belongs to the technical field of copper alloys, and particularly relates to a method for regulating and controlling a copper alloy texture through gradient temperature control deformation. The method for regulating and controlling the copper alloy texture through gradient gradient temperature control deformation comprises the following step that gradient gradient temperature control deformation is conducted on a copper-based material. According to the method, the texture type and distribution can be effectively regulated and controlled, and the Brass texture content is greatly reduced; in addition, by means of the method, the content of the Y texture beneficial to plasticity can be increased, and the plastic deformation capacity of the copper alloy is greatly enhanced on the basis that the strength of the copper alloy is kept.

The invention discloses a high-strength and high-plasticity copper alloy and a preparation method thereof. The high-strength and high-plasticity copper alloy is prepared by mixing Cu-Al pre-alloyed spherical powder and CuO powder according to the mass ratio of (100-150): 1, wherein the Cu-Al pre-alloyed spherical powder and the CuO powder are different in particle size range. The solid solution state Al element part in the high-strength plastic copper alloy is oxidized into Al2O3 through CuO, and the Al2O3 exists in a Cu matrix. The preparation method comprises the following steps: (1) mixing Cu-Al pre-alloyed spherical powder with CuO powder, and drying; (2) cold isostatic pressing treatment; (3) vacuumizing, sintering at a high temperature in a protective atmosphere, and cooling; (4) vacuumizing, reducing in a reducing atmosphere, and cooling; and (5) after preheating, the copper alloy reduction blank is placed in a rotary forging die, rotary forging and air cooling are conducted, and the copper alloy is obtained. The high-strength plastic copper alloy is good in conductivity and mechanical property and high in plasticity. The method is simple in process, environmentally friendly, low in cost and suitable for industrial production.

The application discloses an easy-to-cut steel with excellent plasticity and drilling performance and a preparation method thereof, and the preparation method comprises the following steps: converter smelting, LF refining, continuous casting, hot rolling and air cooling line cooling; in the continuous casting step, the water quantity of a crystallizer is 130-140 m 3 / h, and the secondary cooling water quantity is 0.8-1.0 L / kg; in the air cooling line cooling step, the cooling speed is 1-1.5 DEG C / s from the spinning temperature to greater than 650 DEG C, and the cooling speed is 2-4 DEG C / s in the range of 650 DEG C-500 DEG C; under the condition of not adding easy-to-cut elements and increasing production cost, the plasticity and drilling performance of the easy-to-cut steel are significantly improved by controlling the manganese sulfide inclusion size, hardness and structure of the rolled material.

The invention discloses a manufacturing process of an NO7718 nickel base alloy nut for nuclear equipment. The manufacturing process comprises the steps of material preparation, hot forging, shot blasting, solid solution heat treatment, physical and chemical detection, finish machining, precipitation hardening heat treatment and detection packaging. The hot forging near-net forming technology is adopted, the shape of the nut blank is directly obtained through plastic deformation, the cutting allowance of machining is greatly reduced, a large number of raw materials are prevented from becoming sweeps, the material utilization rate is remarkably increased, and the raw material cost is effectively reduced; by accurately controlling the initial forging temperature, the final forging temperature and the cooling speed of hot forging as well as subsequent solution treatment and precipitation hardening treatment, grains can be refined, and the precipitation form and distribution of a strengthening phase can be controlled, so that the microstructure of the material is optimized, and the material obtains more excellent comprehensive mechanical properties such as higher strength, plasticity and toughness cooperation; and the harsh working condition requirements of nuclear equipment can be better met. The process provided by the invention ensures the stability and consistency of product performance.

The invention provides a cylindrical part differential temperature thinning deep drawing die and a forming method, and relates to the technical field of thinning deep drawing. A female die is provided with a first sub-cavity with the horizontal diameter gradually reduced, so that the side wall of a cylindrical blank is gradually thinned in the axial direction in the deep drawing process, meanwhile, the female die and the cylindrical blank are integrally heated through a heating part, and the cylindrical blank is heated through a second sub-cavity with the horizontal diameter gradually reduced; the material fluidity is enhanced, plastic deformation is facilitated, the plasticity of the material is ensured, the bottom and the side wall of the barrel-shaped blank subjected to deep drawing are locally cooled through the cooling component, the flow stress is improved, the material strength is improved, excessive thinning is restrained, therefore, the wall thickness distribution of the barrel-shaped part is effectively controlled, and the defect risk in the forming process is reduced; and the size precision and the product quality of the cylindrical part are improved.

The application belongs to the field of high-entropy alloys, and particularly relates to a preparation method of an ultra-high strength and plasticity product Fe50Mn30Co10Cr10 alloy. Firstly, a cast slab is prepared through vacuum induction melting, then the cast slab is subjected to multi-pass hot rolling with a reduction ratio of 70% to 75%, and after pickling, the cast slab is subjected to multi-pass warm rolling with a reduction ratio of 80%, and finally, high-temperature short-time annealing is carried out at 1050 to 1150 DEG C to obtain a final annealing plate. In the application, the phase transformation behavior in the alloy deformation process is inhibited by controlling the hot rolling and warm rolling temperatures, and the rolling plasticity of the material is improved. Meanwhile, by optimizing the annealing process, the grains are refined as much as possible, and a certain dislocation density is retained, and the strength and plasticity of the alloy are improved through the comprehensive action of multiple strengthening mechanisms. The prepared Fe50Mn30Co10Cr10 alloy has a tensile strength of 1050 to 1280 MPa, an elongation of 35% to 58%, and a strength and plasticity product of 40 to 73 GPa.

The invention discloses a heat treatment method for regulating and controlling lamellar structures of TiAl alloy forgings, and belongs to the technical field of heat treatment of alloy materials. According to the method, the obtained forged TiAl alloy is placed in a heat treatment furnace with the temperature of T alpha + / -10 DEG C, after heat preservation is conducted for 5-30 min, multi-stage step-by-step cooling is conducted, the TiAl alloy with the fine near-lamellar structure is obtained, the multi-stage step-by-step cooling mode comprises two modes, the first mode is furnace cooling + air cooling, and the second mode is furnace cooling + air cooling + oil cooling; by regulating and controlling the critical temperature point, the cooling speed and possible short-time heat preservation of each cooling stage, accurate control over lamellar regularity, lamellar cluster size and grain refinement degree is achieved, generation of Widmannstatten structures and metastable structures is effectively inhibited, and the structure uniformity and the strength and plasticity matching performance are remarkably improved.

The invention relates to a delayed fracture resistant non-quenched and tempered 14.9-grade high-strength cold heading steel wire rod and a preparation method thereof. The wire rod comprises the following chemical components: 0.33%-0.55% of C, less than or equal to 0.10% of Si, 1.5%-2.3% of Mn, 0.4%-0.6% of Cr, 0-0.04% of Nb, 0-0.1% of V, 0-0.1% of Ti, 0.004%-0.008% of B, more than or equal to 0.020% of Als, less than or equal to 0.040% of Alt, less than or equal to 0.015% of P, less than or equal to 0.010% of S, less than or equal to 1ppm of H and the balance of Fe and impurity elements. Fine control is adopted in the steelmaking process, the H content is strictly controlled to be lower than 1 ppm, a hydrogen trap is manufactured by adding microalloy elements such as Nb, V and Ti, and the delayed fracture resistance is improved; the air cooling speed of the rolled hot-rolled wire rod is precisely controlled, so that the structure of the hot-rolled wire rod is lath bainite, and high strength is realized by utilizing a medium-carbon bainite structure; the finished wire rod has high strength, high plasticity, excellent low-temperature impact toughness and good delayed fracture resistance.

The invention relates to a steel wire rod for a non-quenched and tempered fastener, a production method of the steel wire rod and the fastener, and the steel wire rod is characterized in that through component design, an element B is added on the basis of strengthening elements such as carbon, silicon and manganese, so that excellent hardenability and plasticity of steel are guaranteed; the tensile strength of the steel wire rod obtained through the production process of converter smelting, LF refining, bloom continuous casting, cogging, steel wire rod rolling and offline salt bath of the steel wire rod is 1050-1250 MPa, and the percentage reduction of area is 65-70%; the steel wire rod is subjected to drawing and cold heading to produce the fastener, thermal refining can be omitted, the technical requirements of the 12.9-grade fastener can be met, and the production cost and the carbon emission are effectively reduced.

The invention discloses a laser powder bed molten high-strength, high-plasticity and high-work-hardening titanium alloy and a preparation method and application thereof.The preparation method comprises the steps that two kinds of titanium alloy powder with different Mo equivalents are mixed according to a certain mass ratio to form mixed powder, and the mixed powder is put into laser powder bed melting equipment; the titanium alloy is finally obtained through layer-by-layer forming by laser powder bed melting equipment according to a slicing path and process parameters of a three-dimensional model, the microstructure of the prepared titanium alloy comprises hexagonal martensite alpha 'and orthorhombic martensite alpha', and in a preferable scheme, under the condition that heat treatment is not needed, the yield strength of the titanium alloy is larger than or equal to 950 MPa, the tensile strength is larger than or equal to 1250 MPa, and the tensile strength is larger than or equal to 1250 MPa. The alloy has the advantages of high strength, high plasticity and excellent work hardening capacity, can meet the requirements of forming and high mechanical properties of titanium alloy components in complex shapes, and is especially suitable for the fields of aerospace, automobiles, weapon armors, ships, oceans and the like, and the ductility is greater than or equal to 14%, and the work hardening capacity is greater than or equal to 250 MPa.

The invention discloses a high-strength and high-plasticity low-melting-point aluminum alloy brazing material and a preparation method and application thereof, and relates to the technical field of solder manufacturing. The low-melting-point aluminum alloy welding flux is prepared from the following components in percentage by weight: 10 to 14 percent of Si, 4 to 20 percent of Cu, 0.04 to 0.25 percent of Eu, 0.78 to 0.82 percent of Fe, 0.13 to 0.17 percent of Mn, 0.08 to 0.12 percent of Mg, 0.18 to 0.22 percent of Zn and the balance of aluminum and inevitable impurities. The Al-Si-Cu ternary alloy is constructed to form a low-melting-point eutectic phase, the melting point of the material is effectively reduced, meanwhile, Eu atoms are doped, the aluminum matrix is subjected to the pressure stress effect, the interplanar spacing is reduced, the grain size of the matrix aluminum phase is reduced, the elemental Si phase is refined, the eutectic Al-Si phase content is increased, and precipitation of the brittle Al2Cu phase is restrained; therefore, the aluminum alloy solder has high tensile strength and elongation after fracture under the condition that the melting point is low.

The invention discloses high-wear-resistance environment-friendly pre-hardened low-crack-sensitivity saw blade steel and a manufacturing method thereof. The high-wear-resistance environment-friendly pre-hardened low-crack-sensitivity saw blade steel comprises the following chemical components in percentage by weight: 0.16 to 0.25 percent of C, 0.3 to 0.8 percent of Si, 1.2 to 1.6 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.010 percent of S, 0.10 to 0.40 percent of Cr, less than or equal to 0.45 percent of Mo, 0.01 to 0.08 percent of Als, 0.0005 to 0.0020 percent of B, 0.010 to 0.030 percent of Ti, 0.0015 to 0.0035 percent of Mg, 0.2 to 0.4 percent of TiB2 and the balance of Fe and inevitable impurities. Ti / (Mg + B) is equal to 5.0 to 6.0, and B / TiB2 is equal to 0.0025 to 0.0050; the manufacturing method comprises the steps of smelting and refining, continuous casting, heating, rolling, cooling and straightening. Production of the high-performance pre-hardened saw blade steel is achieved through the low-carbon multi-element composite microalloying and controlled rolling and controlled cooling processes, the saw blade steel has good matching of strength, plasticity and toughness, meanwhile, online pre-hardening is achieved, offline oil quenching and tempering treatment are omitted, and environment-friendly pre-hardening production of the saw blade steel is achieved.

A kind of titanium alloy plate local heat / electricity / ultrasonic multi-field coupling assisted progressive forming device and its use method, relate to a kind of titanium alloy plate progressive forming device and its use method.The present application is to solve the technical problems of the existing titanium alloy plate progressive forming method relatively slow heating speed, high energy consumption, poor product quality.The device of the present application realizes two-stage heating by local non-contact heating and pulse current self-resistance heating, improves the heating rate, improves the material plasticity by the "electroplasticity" effect generated by pulse current, reduces the material deformation resistance by the "ultrasonic softening" effect generated by ultrasonic field, improves the formability, and improves the forming quality by multi-field coupling.The present application realizes the reduction of material deformation resistance and plasticity by the coupling of heat, electricity and ultrasonic multi-energy field in the deformation process of sheet metal, and significantly improves the formability of material.

The invention provides a method for inhibiting cracks of an additive manufacturing nickel-based superalloy and application of the method. The method comprises the steps that a selective laser melting technology is adopted, nickel-based alloy powder is subjected to 3D printing, so that the nickel-based alloy powder is formed layer by layer, and a printing component is obtained; wherein during printing, interlayer rotation is carried out, and after printing of each layer is completed, the layer is subjected to same-path instant remelting with the same laser scanning path and the same 3D printing process condition; the printing component is subjected to sectional type heat treatment, the sectional type heat treatment comprises a first stage, a second stage and a third stage, the heat treatment temperature of the first stage is 650-850 DEG C, the heat treatment temperature of the second stage is 950-1200 DEG C, and the heat treatment temperature of the third stage is 650-850 DEG C, so that the nickel-based superalloy is obtained. According to the method, the crack inhibition effect of the additive manufacturing nickel-based superalloy can be improved, and the strength and plasticity of the additive manufacturing nickel-based superalloy are improved.

The invention belongs to the technical field of material forming and manufacturing, and discloses a hot gas expansion-explosion composite forming method for forming a complex deep-cavity thin-wall component. According to the hot air expansion-explosion composite forming method, a mold unit, an air pressure loading unit and an explosion unit are needed; the method comprises the following steps: mold preheating; feeding and die assembly are carried out; compressed air is filled, and pre-expansion is carried out; fuel is sprayed, and explosion forming is conducted; releasing pressure; and opening the mold and taking the part. The method has the advantages that hot gas bulging forming utilizes metal high-temperature plasticity and evenly-distributed flexible air pressure loading, and the plate forming performance is improved; explosive forming has a very high deformation rate, high plastic deformation can be achieved within a very short time, and the forming performance of the plate can be further improved through the combined action of the strain rate effect and the inertia force. According to the method, the plastic deformation capacity of the material can be remarkably improved by combining the two, and forming of the complex deep-cavity thin-wall component is facilitated.

The invention discloses a preparation method of a high-toughness beta titanium alloy wire. The preparation method comprises the following steps: providing a beta titanium alloy coiled wire; the coiled wire is subjected to multi-pass roller die hot drawing, and a first middle wire is obtained; performing eye mold hot drawing, sizing and rounding on the first middle wire rod to obtain a second middle wire rod; carrying out on-line short-time solution treatment on the second intermediate wire rod and cooling the second intermediate wire rod; performing eye mold hot drawing on the wire rod subjected to solution treatment to obtain a third middle wire rod; and the third middle wire rod is subjected to eye mold cold drawing, and the beta titanium alloy wire rod of the final specification is obtained. According to the preparation method of the high-toughness beta titanium alloy wire rod, the problems that crystal grains are coarse and large due to repeated solid solution of titanium alloy, sufficient precipitation behaviors cannot be obtained due to direct solid solution, the solid solution cold tensile strength is too high, the plasticity is low and cold plastic forming is difficult to achieve due to sufficient large deformation and cold deformation after solid solution, and the contradiction between the processing technology and the material performance is solved.

This invention relates to the field of metallic materials technology, and more particularly to a negative enthalpy duplex stainless steel material and its preparation method, which possesses high strength, high plasticity, and high corrosion resistance. The negative enthalpy duplex stainless steel material is Fe... a Cr b Ni c Mo d Mn e C f Si g Ti h Al i V j Wherein, a, b, c, d, e, f, g, h, i, and j correspond to the mass percentages of each element: a = 60-70 wt%, b = 15-20 wt%, c = 10-15 wt%, d = 0-5 wt%, e = 1-5 wt%, f = 0.015 wt%, g = 0-1 wt%, h = 0-3 wt%, i = 0-0.5 wt%, j = 0-0.5 wt%, and d, g, h, i, and j are not zero. This series of negative enthalpy duplex stainless steel materials all contain ferrite and austenite in their structure, and the microstructure and mechanical properties of the alloy can be controlled by adjusting the proportions of different metal elements. This series of negative enthalpy duplex stainless steel materials exhibits high strength and high ductility. Simultaneously, negative enthalpy duplex stainless steel materials exhibit excellent corrosion resistance.

The invention relates to the technical field of alloy materials, in particular to a tungsten-zirconium active material and a preparation method thereof. The tungsten-zirconium active material provided by the invention is prepared from the following elements in percentage by mass through a specific preparation method: 55-85% of W, 10-35% of Zr and 3-30% of other elements, and the other elements are more than two of Ti, Nb, Hf and Mo. The content of W is controlled to be 55-85%, so that the density of the material is 11 g / cm < 3 > or above, the high strength of the material is ensured, and the material has kinetic energy penetration capacity; the content of Zr is 10% or above, and it is guaranteed that the material has certain activity; and the addition of other elements such as Ti, Nb, Hf and Mo inhibits the generation of a W2Zr brittle phase, so that the plasticity of the tungsten-zirconium active material is improved. And by combining with a specific preparation method, the prepared tungsten-zirconium active material has high plasticity while having high strength and high density.

The invention discloses an ultrasonic and current-assisted bulging device and method for a metal special-shaped pipe fitting, and belongs to the field of material processing engineering. In order to solve the problems that some high-strength metal pipes are difficult to bulge, large in deformation resistance, prone to cracking and prone to local thinning, the metal pipes are heated through current, media in the metal pipes vibrate through an ultrasonic vibration system, the media in the metal pipes are pressurized through a pressure applying system, and the metal pipes are heated through the ultrasonic vibration system. By utilizing the characteristic that a medium in the metal tube is solid at room temperature and is liquid after being heated, the bulging process is completed for the metal tube. Through the current heat effect, the heating efficiency can be remarkably improved, and the forming efficiency and quality of the metal pipe are finally improved by utilizing the potential of the current in the aspect of improving the plasticity of the metal material. Ultrasonic vibration is applied to the metal pipe through the ultrasonic vibration device, the elongation and thickness uniformity of the material are effectively enhanced, and forming of the high-strength metal pipe is facilitated. The device and the method are mainly used for forming the difficult-to-deform metal pipe.