81results about How to "Promotes dynamic recrystallization" patented technology

The invention relates to an electroslag remelting technique, in particular to a vacuum/gas shield electroslag remelting continuous directional solidification device and method. The device comprises a power supply, a consumable electrode (1), a water-cooling crystallizer (2) and a gas shield system, wherein the lower part of the water-cooling crystallizer (2) is provided with a water-cooling chassis (7) and a stripping device (13), and a two-circuit control mode is adopted by the consumable electrode (1) to make the stripping speed equivalent with the solidification speed of a cast ingot. The invention has simple operation and low cost, is convenient to control, can be used for producing large-dimension low-segregation directional solidification cast ingots and is suitable for mass production and application.

The invention discloses a regulation and preparation method of a LPSO phase in an Mg-Gd-Er-Zn-Zr alloy, and belongs to the technical field of heat treatment. The Mg-Gd-Er-Zn-Zr alloy is heated up to the medium temperature of 300-350 DEG C in a heat treatment furnace; the temperature is kept for 15-60 minutes; the quenching is performed by hot water of 70 DEG C; then, the Mg-Gd-Er-Zn-Zr alloy is heated up to the high temperature of 480-520 DEG C; the temperature is kept for 3-8 hours; the quenching is performed by the hot water of 70 DEG C; and finally, the Mg-Gd-Er-Zn-Zr alloy is heated up to the secondary-high temperature of 400-460 DEG C; the temperature is kept for 12-50 hours; and the quenching is performed by the hot water of 70 DEG C. The method not only can control the volume fraction and one-dimensional dimension of the LPSO phase in the alloy, but also can effectively eliminate the component segregation of the casting alloy. Through the control process, the volume fraction of the LPSO phase is 3.2-45.67%, the range of the one-dimensional dimension is 25-120 microns, the component segregation and thick primary tissues of the casting alloy can be obviously eliminated, and the mechanical performance of the alloy is obviously improved.

The invention provides a high-strength deformation magnesium alloy containing rare earth samarium, and a preparation method thereof, belongs to the technical field of metal materials, and solves the problem of overhigh rare earth content and poor mechanical property of traditional magnesium alloy. The magnesium alloy disclosed by the invention is prepared from the following ingredients in parts byweight: 1.0-6.6wt% of Sm, 0.5-3.5wt% of Zn, 0.15-1.5wt% of Zr and the balance of Mg. The invention also provides a preparation method for the high-strength deformation magnesium alloy containing rareearth samarium. The high-strength deformation magnesium alloy containing rare earth samarium disclosed by the invention has excellent mechanical property. Mg-3.5Sm-0.6Zn-0.5Zr is taken as an exampleto show that the indoor temperature yield strength and the tensile strength are respectively 415MPa and 423MPa.

The invention discloses a high-plasticity magnesium alloy and a preparation method thereof. The magnesium alloy comprises the following components in percentage by mass: 3-4% of Zn, 0.1-0.6% of Ca, 0.05-0.8% of Mn, and the balance of Mg and inevitable impurities. Ca and Mn are added in a magnesium zinc alloy to prominently refine alloy grains; in hot extrusion process, the dynamic recrystallization can be promoted to stop growth of recrystallized grains, so that the strength and the plasticity of the alloy are synchronously improved, the base surface texture of the alloy can be prominently weakened, and the plasticity of the alloy is improved; in addition, through separation of a second phase and dispersion and separation of nanoscale Mn particles, the strength of the alloy can be effectively improved; the magnesium alloy is high in plasticity; and the component-optimized alloy can reach the ductility of 25-29.8%, the yield strength of 160-205 MPa and the tensile strength of 270-289 MPa.

The invention provides a method for improving Mg-Al-Zn magnesium alloy thermoforming and service performance. The method comprises the steps that Mg-Al-Zn magnesium alloy is subjected to pre-deformation treatment at 25 DEG C to 300 DEG C, twin crystal or low-angle crystal boundaries are introduced, and then aging treatment is conducted. According to the deformation heat treatment method, precipitation of a continuous precipitation phase of the Mg-Al-Zn magnesium alloy can be effectively promoted, and alloy tissue with a uniform, small and dispersively distributed precipitation phase is obtained finally; and alloy strength and plasticity are synchronously improved, and thermoforming performance and service performance of the alloy are improved. The method for improving the Mg-Al-Zn magnesium alloy thermoforming and service performance is reasonable in design, simple in equipment requirement, convenient to operate, low in cost and high in efficiency, distribution of the precipitation phase of the Mg-Al-Zn magnesium alloy is reasonably controlled, the thermoforming performance and service performance of the alloy are improved, and the method has a good industrial application prospect.

The invention provides a heat treatment method of a GH 4780 alloy forging, and relates to the technical field of alloy manufacturing. The method comprises the following step: carrying out solution heat treatment on the GH 4780 alloy forging, wherein the temperature of the solution heat treatment is 1020-1170 DEG C. The GH 4780 alloy forging subjected to heat treatment not only can effectively eliminate the segregation of alloy elements such as Ti, Al and Cr in the smelting process and eliminate metallurgical defects such as cavities, but also can break columnar crystals and promote dynamic recrystallization, thereby refining the crystal grains and improving the strength and plasticity of the alloy forging.

The invention relates to an aluminum-based composite material, in particular to an in-situ nanometer reinforced aluminum alloy for a lightweight automobile anti-collision beam and a preparation method. Through the in-situ synthesis technology, mixed powder of zirconium carbonate, potassium fluoborate and potassium fluotitanate is adopted as a reactant, an acoustomagnetic coupled field is applied in the reaction process, an acoustomagnetic coupled field is applied in the solidification stage, and an evenly-distributed nanometer wild phase clustered composite material of a fine grain structure is obtained. Then, through the optimized hot extrusion technology and quenching technology, material defects are reduced, sub-grains in the material are promoted to generate dynamic recrystallization,fine recrystallized grains are obtained, the strength, plasticity, impact resistance and corrosion resistance of the material are improved, the collision energy absorption effect of the material is improved to the largest degree, and a qualified aluminum-based composite material profile for the automobile anti-collision beam is obtained.

The invention discloses a manufacturing mold and method of high-strength high-toughness fine-grain light alloy tubing. The manufacturing mold comprises an extrusion container, an extrusion cushion and a forming mandrel. The extrusion container is provided with a feeding section and a discharging section. The extrusion cushion is arranged in the feeding section. A separation section and a welding chamber are arranged between the feeding section and the discharging section. Multiple blank channels are arranged on the separation section. The forming mandrel and the extrusion cylinder are coaxial, and the forming mandrel extends out from the discharging section. The manufacturing method comprises the following steps that firstly, light alloy cylindrical blanks are heated to a temperature being a recrystallization temperature or above; secondly, the heated blanks are placed in the extrusion container; thirdly, an extruding machine is switched on, and the blanks are extruded through the extruding machine; and fourthly, under extrusion of the extruding machine, the tubing is obtained finally. The light alloy material adopted by the manufacturing mold and the method is of a quite fine crystal structure and high in yield stress, and therefore the plasticity, the low-temperature super-plasticity and the high strain rate super-plasticity of the tubing can be greatly improved.

The invention discloses a high-strength Mg-Ca-Mn-Al-Zn series wrought magnesium alloy containing gadolinium and yttrium rare earth elements and a preparation method thereof, and belongs to the field of wrought magnesium alloy materials. The high-strength Mg-Ca-Mn-Al-Zn series wrought magnesium alloy comprises the following components in percentage by mass: 0.50-2.00% of calcium, 0.10-2.00% of aluminum, 0.10-2.00% of zinc, 0.10-3.00% of manganese, 0.10-3.00% of rare earth (gadolinium or yttrium), and the balance magnesium and inevitable impurities (Si, Ni, Cu and the like). The preparation method of the magnesium alloy comprises the following steps of: firstly, melting a pure magnesium ingot; after fully melting, adding metal calcium, manganese, aluminum, zinc, rare earth (gadolinium or yttrium) and the like; after fully stirring, casting into an ingot; then, homogenizing the ingot; extruding through a reverse extrusion process to obtain a corresponding extruded profile; and preparing the novel wrought magnesium alloy with high strength and high plasticity through smelting, homogenizing and subsequent extrusion (reverse extrusion) processes. The strength and the toughness of the wrought magnesium alloy are enhanced, and the wrought magnesium alloy has better mechanical properties.

The invention discloses super-thick Q355-grade hot-rolled H-shaped steel with good low-temperature toughness and a production method thereof. The H-shaped steel comprises the following chemical components of, in percentage by mass, 0.12-0.18% of C, 0.10-0.50% of Si, 1.20-1.60% of Mn, 0.02-0.06% of Al, 0.02-0.06% of Nb, 0.0040-0.0100% of N, less than or equal to 0.015% of P, less than or equal to 0.005% of S, the balance Fe and inevitable impurities, with flange thickness of 80-150mm, less than or equal to 0.42% of CEV, and less than or equal to 0.25% of Pcm. The invention further provides an Nb and Al microalloying low-cost component design scheme. With reasonable continuous casting process and rolling process, distribution of AlN and NbC in a continuous casting billet and the H-shaped steel is controlled, a beam blank structure is improved, a H-shaped steel structure is refined, the product mechanical performance is good, and the economic benefits are good.

The invention provides a high-strength wrought magnesium alloy containing rare earth neodymium and yttrium. The alloy comprises the following components in percentages by mass: 5.50-6.50wt.% of Zn, 0.47-0.80wt.% of Zr, 0.45-0.50wt.% of Nd, 0.72-1.00wt.% of Y, less than 0.10wt.% of inevitable impurities and the balance of Mg. A preparation method comprises the following steps: homogenizing a magnesium alloy ingot containing rare earth neodymium and yttrium, and then performing hot extrusion. Crystal grains are remarkably refined, meanwhile, neodymium, yttrium and elements such as magnesium andzinc in the alloy form second phases, and the second phases are re-crushed and distributed into fine dispersed strengthening phases in the hot extrusion process, so that growth of recrystallized crystal grains in the hot deformation process can be effectively hindered, a matrix is strengthened, and good mechanical properties can be obtained; and after hot extrusion, low-temperature aging treatmentis performed, so that the strength can be further improved, and the tensile strength after aging exceeds 400 MPa and is higher than that of most commercial magnesium alloys at present. The alloy is low in cost, a conventional smelting hot extrusion process is adopted, and the alloy has good operability and practicability and is convenient to popularize and apply.

The invention relates to low-cost high-toughness wrought magnesium alloy capable of being extruded at high speed and a preparation method thereof. The alloy is Mg-Bi-Sn-Al-Ca magnesium alloy and comprises, by mass, 2-45 of Bi, 2-4% of Sn, 1-3% of Al, 0.05-0.5% of Ca and the balance magnesium, wherein the mass ratio of Bi to Sn in the alloy is (0.8-1.2):1. The alloy can be used for high-speed extrusion production at the extrusion speed up to 25 m/min, the production efficiency is improved, and meanwhile, the production cost is reduced. Crystalline grains of a finally extruded product are uniform and fine, a large number of second phases are dispersed in a matrix, the comprehensive mechanical property is good, and the alloy is relatively good in flame retardancy.

The invention discloses a high-strength Mg-Ca-Mn-Al-Zn wrought magnesium alloy containing a light rare earth element lanthanum and a preparation method of the high-strength Mg-Ca-Mn-Al-Zn wrought magnesium alloy, and belongs to the field of wrought magnesium alloy materials. The high-strength Mg-Ca-Mn-Al-Zn wrought magnesium alloy comprises the following components of, in percentage by mass, 0.10to 1.50% of calcium, 0.10 to 1.8% of aluminum, 0.10 to 1.9% of zinc, 0.10 to 4.8% of manganese, 0.20 to 3.00% of lanthanum, and the balance magnesium and unavoidable impurities (Si, Ni, Cu and the like); and the preparation method of the magnesium alloy comprises the following steps that a pure magnesium cast ingot is melt firstly, after fully melting is carried out, metal calcium, manganese, aluminum, zinc, light rare earth lanthanum and the like are added, fully stirring is carried out, casting into a cast ingot is carried out, then homogenizing treatment on the cast ingot is carried out, and extruding through a reverse extrusion process is carried out to obtain a corresponding extruded profile. According to the high-strength Mg-Ca-Mn-Al-Zn wrought magnesium alloy containing the light rare earth element lanthanum and the preparation method of the high-strength Mg-Ca-Mn-Al-Zn wrought magnesium alloy, the novel wrought magnesium alloy with high strength and high plasticity is preparedthrough smelting, homogenizing treatment and subsequent extrusion (reverse extrusion) processes, the strength and toughness of the novel wrought magnesium alloy are enhanced, and the novel wrought magnesium alloy has good mechanical properties.

The invention discloses a plastic deformation magnesium (Mg) alloy and a preparation method thereof. The plastic deformation Mg alloy is a Mg-Al-Bi-Sn-Ca-Y alloy, and consists of, by weight percent, 3.0-6.0% of Al, 1.0-3.0% of Bi, 0.5-2.0% of Sn, 0.02-0.05% of Ca, 0.02-0.05% of Y, and the balance Mg, wherein the total content of the element Ca and the element Y is greater than 0.05% and less than0.1%. The plastic deformation Mg alloy and the preparation method thereof adopt lower extrusion temperature and speed to form a large amount of Mg3Bi2 phases, Mg2Sn phases and Mg17Al12, and inhibit excessive growth of second phases by alloying a trace of the elements Ca and Y at the same time. In addition, the element Bi, the element Sn, a trace of the element Ca and a trace of the element Y are simultaneously dissolved into a matrix to improve the texture characteristics of the deformation alloy so as to develop the high-room-temperature-ductility deformation Mg alloy of which the room temperature elongation can reach upwards of 32%.

The invention provides a high-strength wrought aluminum alloy containing rare earth samarium and a preparation method of the high-strength wrought aluminum alloy, and belongs to the technical field ofmetal materials. The problem that an existing aluminum alloy is poor in mechanical property is solved. The aluminum alloy is prepared from the following chemical components of, in percentage by mass,1.5wt.% - 2.5wt.% of Mg, 0.5wt.% - 1.5wt.% of Si, 0.2wt.% - 1.2wt.% of Cu, 0.1wt.% - 0.5wt.% of Sm and the balance Al. The high-strength wrought aluminum alloy containing the rare earth samarium hasexcellent mechanical properties, and by taking Al-2Mg-Si-0.9Cu-0.5Sm as an example, the room-temperature yield strength and the tensile strength of the Al-2Mg-Si-0.9Cu-0.5Sm is 315MPa and 423MPa respectively.

The invention discloses a temperature-controlled rolling technology of magnesium alloy coiled sheets. The steps comprise: (1) performing heating compensation on a magnesium coiled sheet and uncoiling the magnesium coiled sheet; (2) performing sheet heating compensation and adjusting turning directions of the magnesium alloy sheets; (3) measuring tension of the sheet and controlling a crimp force value; (4) performing integrated temperature control on a part which is to bite into the sheet; (5) performing gradient temperature control on the width direction of the part which is to bite into the sheet; (6) through a temperature-controlled roll, performing finishing rolling on the sheet and the sheet deforming; (7) measuring tension of the sheet and controlling a crimp force; (8) performing sheet heating compensation and adjusting turning directions of the magnesium alloy sheets; (9) performing sheet heating compensation and coiling the sheet in rolls; (10) if the thickness of the magnesium plate coil sheet does not reach the thickness (t0) of a target magnesium plate, reversely repeating the steps (1)-(9) on magnesium coiled sheets on a reversible temperature-controlled rolling mill according to the process steps, performing next temperature-controlled finish rolling processing; (11) if the thickness of the magnesium sheet reaches the thickness (t0) of the target magnesium plate, obtaining the magnesium alloy coiled sheet satisfying the thickness requirements.

The invention provides a square bloom continuous casting manufacturing method facilitating elimination of core defects and belongs to the field of large-section square bloom production. According to the square bloom continuous casting manufacturing method, the continuous casting blank soft reduction technology and the hot core high-temperature heavy reduction rolling technology are optimized and combined. The core macrosegregation defects are eliminated in the soft reduction process; heavy-reduction rolling mills are directly arranged behind a continuous casting straightening and withdrawing machine, the online opposite reduction rolling process is implemented by making full use of cold outside and hot inside temperature field features of a casting blank under the complete solidification state of the casting blank to eliminate the defects such as core shrinkage cavity porosity.

The invention discloses an ultra-wide economical duplex stainless steel medium plate and a manufacturing method thereof. The medium axial crystal proportion of a continuous casting billet is not lowerthan 80%; the surface roughness Ra of the casting billet is smaller than or equal to 50 [mu]m, and high-temperature antioxidant coating is sprayed; the preheating section temperature of the casting billet is 960-1100 DEG C, the heating section temperature is 1150-1230 DEG C, and the soaking section temperature is 1220-1250 DEG C; the rough rolling starting temperature is larger than or equal to 1150 DEG C, the first pass reduction amount is larger than or equal to 25%, the subsequent pass reduction amount is smaller than or equal to 20%, the roller speed is 40-70 r/min, and the thickness of an intermediate blank is 60-120 mm; the finish rolling start temperature is larger than or equal to 1050 DEG C, the finish rolling temperature is larger than or equal to 950 DEG C, the rolling reduction rate is smaller than or equal to 20%, product specifications are 2800-4000 mm wide and 20-60 mm thick, and the surface crack rejection rate is decreased from above 10% to below 1.5%. The product iswidely applied to the engineering fields of nuclear power, oil and gas, shipbuilding, papermaking, seawater desalination and the like.

The invention discloses a high-strength rare earth wrought magnesium alloy and a preparation method thereof. The high-strength rare earth wrought magnesium alloy comprises, by mass, 6%-9% of Al, 1.5%-2.5% of Nd, 0.2%-1.5% of Zn, 0.3%-2.0% of Si, 1.2%-2.5% of Zr, 5%-7% of Y, 5%-7% of Gd, 1%-5% of Sm, and the balance Mg and inevitable impurities, wherein (Y+Gd): Sm is equal to 2.8-14; According to the high-strength rare earth wrought magnesium alloy and the preparation method thereof, by adding aluminum, silicon, zinc and various rare earth elements into magnesium alloy raw materials, the tensile strength of the magnesium alloy raw materials is greater than 450 MPa, the elastic modulus of the magnesium alloy raw materials is greater than 55 GPa, the requirements for high strength and high elastic modulus of magnesium alloy in the prior art can be met, and the high-strength rare earth wrought magnesium alloy has the wider application field.

The invention discloses a manufacturing method of a magnesium alloy bar. The manufacturing method of the magnesium alloy bar comprises the following steps that a raw blank is machined, so that the baris obtained; the bar is extruded; the bar is preheated; and the obtained magnesium alloy bar is subjected to hole pattern rolling operation, the rolling operation is conducted in sequence according to the diamond-square mode, 1-4 passes are conducted through the rolling operation, the rolling speed is 0.1m/s-0.5m/s, the bar is rotated by 90 degrees when each pass is changed in the rolling process, finally the square hole serves as the final rolling pass, the correction is conducted for one time, and therefore the final form of the bar can be guaranteed. By the adoption of the manufacturing method of the magnesium alloy bar, the anisotropy of the bar which is extruded to deform can be remarkably improved, and the toughness of the bar can be further improved.

The invention relates to a magnesium alloy plate manufacturing technology. Based on existing mature conventional magnesium alloy which is good in comprehensive performance but cannot completely meet the plate requirement of an automobile body, a micron quasi-crystal intermediate alloy online mixed melting technology, a magnesium alloy plate cast rolling technology and a dynamic recrystallization hot rolling technology are adopted to modify the magnesium alloy and enable the performance of the magnesium alloy to be improved. By means of the producing method, the production cost can be remarkably reduced, the performance of the plate can be improved, and index can be closer to the requirement for sheet metal parts in the automobile industry.

The invention discloses a high-Mn Mg-Ca-Mn-Al-Zn series deforming magnesium alloy and a preparing method thereof, and belongs to the field of deforming magnesium alloy materials. The high-Mn Mg-Ca-Mn-Al-Zn series deforming magnesium alloy comprises, by mass percent, 0.10 to 0.40% of Ca, 0.30 to 2.50% of Al, 0.30 to 2.50% of Zn, 2.00 to 5.00 of Mn and the balance Mg and other inevitable impurities(Si, Ni, Cu and the like), and the preparing method of the magnesium alloy comprises the steps that a pure magnesium ingot casting is melted, after sufficient melting, calcium, manganese, aluminum, zinc and the like are added, after sufficient stirring, pouring is carried out to form the ingot casting, then, homogenization treatment of the ingot casting is carried out, and through a reverse extrusion process, a corresponding extrusion profile is obtained. Through a smelting, homogenization treatment and subsequent extrusion (reverse extrusion) process, the novel deforming magnesium alloy highin strength and high in plasticity can be prepared, the strength and the plasticity can be reinforced, and the good mechanical property is achieved.

The invention discloses a method for improving forging properties of gamma-TiAl alloy through hydrogenation, relates to the method for improving the forging properties of the gamma-TiAl alloy, and aims to improve the hot forming properties of the gamma-TiAl alloy under the conditions that the density of the existing gamma-TiAl alloy is not increased, the creep resistance is not reduced, and the room-temperature ductility is not reduced. The method comprises the following steps: firstly, filling hydrogen to a gamma-TiAl alloy green body; secondly, spraying a high-temperature antioxidant on the surface of the hydrogenated gamma-TiAl alloy billet and preheating; thirdly, forging the hydrogenated gamma-TiAl alloy billet at high temperature, and performing heat insulation to obtain a hydrogenated gamma-TiAl alloy forged piece; fourthly, dehydrogenating the hydrogenated gamma-TiAl alloy forged piece. The method disclosed by the invention is used for improving the forging properties of the gamma-TiAl alloy.

The invention discloses a wrought magnesium alloy containing neodymium samarium light rare earth elements and high Mn content and a preparation method of the wrought magnesium alloy, and belongs to the field of wrought magnesium alloy materials. The wrought magnesium alloy comprises the following components of, in percentage by mass, 0.30% to 1.90% of calcium, 0.30% to 1.50% of aluminum; 0.20% to1.70% of zinc; 0.30% to 2.80% of manganese; 0.30% to 3.00% of light rare earth (samarium or neodymium), and the balance of magnesium and inevitable impurities (Si, Ni, Cu and the like); and the preparation method of the magnesium alloy comprises the following steps that a pure magnesium cast ingot is melt firstly, after fully melting is carried out, metal calcium, manganese, light rare earth (samarium or neodymium) and the like are added, after fully stirring is carried out, casting into a cast ingot is carried out, then homogenization treatment on the cast ingot is carried out, and extrudingthrough a backward extrusion process is carried out to obtain a corresponding extruded profile. According to the wrought magnesium alloy containing neodymium samarium light rare earth elements and high Mn content and the preparation method of the wrought magnesium alloy, the novel wrought magnesium alloy with high strength and high plasticity is prepared through smelting, homogenization treatmentand subsequent extrusion (backward extrusion) processes, the strength and toughness of the novel wrought magnesium alloy are enhanced, and the novel wrought magnesium alloy has good mechanical properties.

The invention relates to a method for simultaneously improving low-carbon low-alloy steel strength and plasticity, and belongs to the technical field of metal materials. According to the method, low-carbon low-alloy steel with both high strength and high plasticity is acquired by subjecting quenched-state low-alloy steel which contains Mo as well as one or more of V, Nb and Ti to tempering treatment, dynamic large deformation and annealing treatment in sequence. Crystalline grains can be further refined through carbides precipitated out of the tempered-state low-carbon low-alloy steel which contains the strong carbide forming elements in the dynamic large deformation process; and in the follow-up annealing process, a large number of fine dispersed carbides are precipitated out, so that the improvement of the steel plasticity can be facilitated when a remarkable second-phase strengthening effect is provided.