627 results about "Cooling rate" patented technology

The invention relates to a high-permeability ultralow-coercive-force soft magnetic stainless steel heat treatment process which comprises the following steps: in a nitrogen atmosphere, firstly heating a hot-rolled wire rod to 900-950 DEG C at a heating rate of 30-50 DEG C / h, preserving heat for 4-6 hours to obtain a fine grain structure of equiaxial recrystallization ferrite, then cooling to room temperature at a cooling rate of less than or equal to 15 DEG C / h to homogenize the ferrite structure, and finally cooling to room temperature at a cooling rate of less than or equal to 15 DEG C / h to obtain the high-permeability ultralow-coercive-force soft magnetic stainless steel. The soft magnetic stainless steel is obtained. The method has the advantages that the maximum magnetic conductivity of the soft magnetic stainless steel is improved, the coercive force of the soft magnetic stainless steel is reduced, and the plasticity index of the soft magnetic stainless steel is improved.

The invention relates to a preparation method of beryllium-copper alloy. The preparation method comprises the following steps: (S1) accurately weighing the following raw materials by mass: copper, beryllium, copper-yttrium alloy, copper-titanium alloy, copper-manganese alloy and nano ytterbium powder; (S2) the raw materials are added into a vacuum induction furnace, the temperature is increased to 1400-1600 DEG C under the inert atmosphere, after the raw materials are completely molten, a covering agent is spread on the melt, smelting, standing and slagging-off are conducted under the stirring condition, the melt is poured into a mold under the condition of 1100-1200 DEG C, and a beryllium copper alloy ingot is obtained; and (S3) the beryllium-copper alloy ingot is subjected to face milling treatment, solution treatment, cold machining deformation treatment and aging treatment in sequence, and the product beryllium-copper alloy is obtained. A small amount of metal elements are added, aging treatment is carried out under the microwave condition, and then slow cooling is carried out at the constant cooling rate, so that the overaging phenomenon can be remarkably inhibited, the hardness of the alloy is improved, and meanwhile, the mechanical property, especially the stress relaxation resistance, is also improved.

The invention discloses a pipeline steel plate for carbon dioxide conveying and a preparation method thereof. In the heating procedure of the preparation method, the soaking temperature is TNbC + (40-100) DEG C, and the soaking time is 30-50 min; in the first hot rolling procedure, multiple passes are included, the plate thickness after rolling is 3.2-4.2 t, the initial rolling temperature is Tnr + (5-25) DEG C, and the final rolling temperature is Tnr + (0-20) DEG C; in the water cooling process, the final cooling temperature is Ar3-20 DEG C-Ar3 + 15 DEG C; in the second hot rolling procedure, multiple passes are included, the plate thickness t after rolling is larger than or equal to 38 mm, and the initial rolling temperature and the final rolling temperature are both Ar3-20 DEG C-Ar3 + 15 DEG C; in the ultrafast water cooling process, the water inlet temperature is larger than or equal to Ar < 3-30 > DEG C, the final cooling temperature is Bs-(460-300) DEG C, and the cooling rate is 9-22 DEG C / s; and in the air-cooling self-tempering process, the steel plate is air-cooled to the room temperature on a cooling bed.

The invention discloses a control method and a preparation method for quenching deformation of a die casting, and the control method comprises the following steps: carrying out partitioned cooling on the die casting subjected to solution treatment to obtain the actual deformation of the cooled die casting; a simulation model is established, and the simulation deformation of the die casting is obtained; the simulation deformation amount is compared with the actual deformation amount; carrying out simulation optimization on the partitioned quenching cooling process of the die casting on the basis of the corrected model; performing quenching cooling test on the die casting based on the simulated and optimized partition quenching cooling process, and correcting the partition quenching cooling process based on the result of the cooling rate; performing partition quenching cooling on the die casting on the basis of the corrected partition quenching cooling process, obtaining corrected deformation of the die casting after quenching cooling, and comparing the corrected deformation with design size data of the die casting; and constraint simulation analysis is carried out on the position with the deformation degree larger than 1mm, and a constraint mode with the minimum deformation degree is obtained.

According to the multi-path cooling control method for the non-adjustable flow of the cooling spray box after hot plate rolling, the mode that an annular rail is combined with a trolley is adopted, the trolley bears a sample through a sample bearing table to do annular motion, the annular rail is an oval rail comprising two parallel linear segments and two semicircular segments, and at least one cooling spray box is arranged along the linear segment rail; the cooling area can be infinitely lengthened at any workpiece speed; according to the cooling starting temperature, the water cooling speed, the cooling stopping temperature, the cooling stopping time between the cooling areas and the production line cooling spray box layout of the N cooling areas determined by the experiment, the experiment device is configured according to different spray box opening modes, the cooling experiment is carried out, and spray box opening mode parameters corresponding to the optimal cooling speed of the N cooling areas are obtained; carrying out cooling control after rolling on corresponding sample production; besides, the method is implemented under the condition basically consistent with the actual working condition of the production line, so that the product design output and the production line process control are more accurate and efficient, the product research and development speed can be effectively increased, the process control precision is improved, and the production line trial-manufacturing cost is reduced.

The invention relates to a preparation method of an MAX phase material. According to the specific technical scheme, precursor powder materials needed for preparing the MAX phase material are mixed to obtain mixed powder, the mixed powder is subjected to mechanical ball milling and cold press forming to form a blank, a to-be-sintered blank is obtained, the to-be-sintered blank is subjected to ultra-fast Joule hot sintering, and the MAX phase material is prepared. The MAX phase material is prepared by using an ultra-fast Joule thermal sintering method, the Joule thermal sintering method has the characteristics of high heating and cooling rate (104 DEG C / min) and high heating temperature (3000 DEG C), and according to the Arrhenius formula, the synthesis rate of the MAX phase material can be greatly improved due to the characteristics of high heating and cooling rate and high heating temperature, and rapid preparation of the MAX phase material is realized. According to the method, the preparation period of the MAX phase material can be greatly shortened, so that the aging can be improved, the energy consumption can be reduced, accurate and controllable preparation can be realized, and the method has important significance on low-cost and large-scale preparation of the MAX phase material.

The invention discloses a crystallization process of o-chloro-p-nitroaniline, which comprises the following steps: feeding a material into a crystallization kettle to crystallize the o-chloro-p-nitroaniline, regulating and controlling the temperature in the kettle body in the crystallization process, cooling to a metastable region of the o-chloro-p-nitroaniline, preserving the heat in the metastable region for a first preset time length, and then cooling to a second preset time length; continuously cooling to a first temperature lower than the melting point of the o-chloro-p-nitroaniline, keeping the temperature at the first temperature for a second preset duration, continuously cooling to a second temperature, and outputting the material out of the crystallization kettle for filtration and separation; in the cooling process, the cooling speed in the kettle body is controlled to be 0.1-0.2 DEG C / min. According to the invention, the interior of the kettle body can be slowly cooled, and the cooling speed of each part in the kettle body can be more uniform, so that the crystallization purity and the product quality of o-chloro-p-nitroaniline are finally improved.

According to the production method of the hot-rolled copper-steel double-metal composite plate, copper is oxygen-free copper, and Cu is larger than or equal to 99.95%; the steel is low-alloy high-strength steel; the key process steps of the copper-steel composite plate comprise assembling, heating, rolling, cooling and finishing. By controlling the rolling temperature, the pass reduction rate, the cooling speed and other processes, the plate shape of the copper-steel rolled composite plate is obviously improved, the stability of the bonding surface is greatly improved, and therefore industrial production and application of the copper-steel bimetal rolled composite plate are achieved.

The invention relates to the technical field of automatic control, in particular to a PE thermal insulation pipe production equipment control method and system.The method comprises the following steps that based on raw material particle size distribution characteristics, heating temperature control parameters are adjusted, the viscosity state is recognized in combination with screw torque and rotating speed, and the feeding rate of each section is adjusted according to the viscosity difference; forming uniformity is calculated and foaming agent injection parameters are adjusted in combination with a foam structure, and flow velocity parameters of a cooling area are adjusted in combination with thermal load evaluation. According to the invention, by introducing raw material particle size analysis parameters and combining torque and viscosity change characteristics, the heating temperature control and extrusion viscosity adjustment process is optimized, the adaptability of equipment to material physical property change is enhanced, the foaming agent injection process is fed back by using foam structure distribution, the foaming uniformity and injection accuracy are improved, and the foaming efficiency is improved. And by adopting linkage analysis of heat release intensity and cooling rate, dynamic regulation and control of the cooling circulation rate are realized, and the consistency and stability of cooling shaping are improved.

The utility model provides a device for improving the cooling uniformity of a high-carbon steel wire rod, the device for improving the cooling uniformity of the high-carbon steel wire rod comprises an air cooling roller way, a plurality of Jinling devices, a plurality of fans and a plurality of temperature measuring assemblies, the air cooling roller way is used for conveying the wire rod; the multiple Jialing devices are arranged on the lower side of the air cooling roller way at intervals. The plurality of fans are in one-to-one correspondence with the Jiangling devices and are used for supplying air to the Jiangling devices; the multiple temperature measuring assemblies are arranged at intervals in the conveying direction of the air cooling roller way. Wherein the temperature measuring assembly comprises a support, a thermal imager and a point temperature instrument, and the thermal imager is connected with the support; the point temperature instrument and the thermal imager are arranged at an interval in the vertical direction, and the point temperature instrument is connected with the support. According to the device for improving the cooling uniformity of the high-carbon steel wire rod, provided by the utility model, the cooling rate of the wire rod in a phase-change temperature range is accurately controlled, and the temperature difference of the same circle in a phase-change area is reduced.

The invention relates to a preparation method of bainite steel with high toughness and strength at low temperature, and the strength and toughness of the bainite steel at low temperature are improved by designing process parameters and steel ingot components. The bainite steel with high toughness and strength at low temperature is finally obtained by designing the components of the steel ingot, avoiding the addition of elements such as nickel, molybdenum and vanadium, reducing the material cost and the processing difficulty and accurately controlling the cooling rate of heat treatment. The prepared bainite steel is composed of strip-shaped bainite and thin strip-shaped retained austenite, and the volume fraction of the retained austenite is 5-10%. The tensile strength is not lower than 1240 MPa, the normal-temperature impact is not lower than 120 J, and the impact toughness at-40 DEG C is not lower than 80 J.

The invention relates to a thermal simulation testing machine sample clamp, a cooling device and an annealing test method, and belongs to the technical field of metal material plate strip annealing tests in the metallurgical industry. According to the technical scheme, the method comprises the following steps: firstly, clamping a sample on a sample clamp, and then putting the sample clamp into a cavity of a thermal simulation testing machine; vacuumizing the cavity of the thermal simulation testing machine, and forming a protective atmosphere in the cavity; heating the sample to 950-1050 DEG C at the speed of 10-50 DEG C / s, keeping the temperature for 3-5 minutes, then quickly cooling the sample to room temperature by blowing, and recording a temperature curve; and stretching the sample subjected to annealing simulation at room temperature, analyzing test data, and observing a metallographic structure through an optical phase microscope. The device has the beneficial effects that on one hand, the problems of short soaking area and low cooling speed in the existing plate and strip annealing test are solved, the processing requirements of a standard tensile sample are met, on the other hand, tedious Jaw module mounting and dismounting operations are avoided, and the test period is shortened.

The invention belongs to the technical field of functional materials, and particularly relates to ultra-thick tabular tungsten oxide and a preparation method thereof.The preparation method of the ultra-thick tabular tungsten oxide comprises the following steps that S1, ammonium tungstate is added into deionized water and stirred to be dissolved at the temperature of 70-90 DEG C, and a clarified ammonium tungstate solution is obtained; s2, cooling the clarified ammonium tungstate solution to normal temperature at a cooling rate of 0.5-2 DEG C / h, and then carrying out suction filtration to obtain plate-shaped ammonium tungstate crystals; s3, calcining the tabular ammonium tungstate crystal to obtain ultra-thick tabular tungsten oxide; ammonium tungstate is adopted as a raw material, controllability is high, tungsten oxide which is uniform in particle size and complete in plate shape is obtained through optimized crystallization and calcination, the purity is larger than or equal to 99%, the problems that traditional tungsten oxide is agglomerated and disordered in shape are solved, functional adaptability is high, the plate-shaped structure can be directionally oriented, the dielectric performance, the breakdown performance and other performance are improved, and the method is suitable for multiple high-end scenes; parameters are easy to control, and operation is simple, green and safe.

The invention discloses welding deformation preventing equipment and method for steel-concrete composite bridge manufacturing, and relates to the technical field of steel-concrete composite bridge welding manufacturing, the welding deformation preventing equipment comprises a working frame, supporting columns, short transverse plates and long transverse plates, heat preservation assemblies are symmetrically arranged at the top of the working frame, and the heat preservation assemblies continuously preserve heat for a cross beam when the cross beam is welded with a plurality of longitudinal beams; and the heat preservation assembly comprises a heat preservation box, a heating pipe and a vertical rod, and a material receiving plate is fixedly arranged on the right side face of the working frame. The two heat preservation assemblies are symmetrically arranged on the top of the workbench. According to the heat preservation assembly, the temperature uniformity of a welding area and an adjacent area is maintained, the welding cooling rate difference is reduced, the tensile stress generated due to local rapid shrinkage and the pressure stress caused by subsequent welding extrusion are reduced, and the thermal stress gradient can be remarkably reduced through constant-temperature control; and accumulated deformation caused by repeated expansion and shrinkage inconsistency of the cross beam in the welding process is restrained.

The invention discloses a manufacturing process of a 1J22 alloy bar with high mechanical performance and high magnetic performance, and belongs to the technical field of precision alloy material processing, the process comprises a rapid cooling treatment step, in the cooling stage after forging or hot rolling forming of the bar, the bar is cooled to be below 650 DEG C from the high temperature not lower than 900 DEG C at the cooling speed of at least 320 DEG C / h, and then the bar is cooled to be below 650 DEG C at the cooling speed of at least 320 DEG C / h; as a 1J22 bar has ordered-disordered transformation at 730 DEG C, in order to prevent brittleness after ordering at 730 DEG C, the bar needs to be quickly cooled within a specific temperature range to improve the brittleness of the material. Compared with the prior art, the 1J22 alloy bar produced on the basis of the technology can guarantee that the magnetic performance is superior to the national standard GB / T14986.3-2018, meanwhile, the mechanical performance is improved, the brittleness is improved, and the phenomena of tooth collapse, corner falling and cracking occurring in the machining process are reduced.

The present invention discloses a preparation method and application of a lithium-rich manganese-based cathode material with a "lithium-deficient" layered spinel composite phase synthesized by a rapid thermal shock method. The preparation method includes the following steps: First, a lithium-rich manganese-based precursor is prepared by a coprecipitation method. After mixing the precursor and a lithium salt, the sample is rapidly heated using the Joule heat of the powder sample to obtain a cathode material with a layered spinel composite phase having lithium defects. The ultra-fast heating and cooling rates and short-time heat preservation produce a lithium-rich manganese-based cathode material with a larger lithium deficiency amount, a more excellent performance, and a layered spinel composite structure. The preparation method of the present invention prepares a lithium-rich manganese-based cathode material with a larger lithium deficiency amount and a composite structure through a rapid thermal shock technology, which has high capacity, high initial efficiency, long cycle stability, and the preparation method is simple, greatly reduces the material cost, can be mass-produced, improves production efficiency, and reduces energy consumption.

The invention discloses a method for improving the mechanical property of anchor rod steel, and belongs to the technical field of steel and iron materials. The method comprises the following steps that (1) on the basis of traditional anchor rod steel components, the element content in steel is optimized through microalloying design; (2) the steel billet is heated to 1150 DEG C to 1250 DEG C; finish rolling is conducted at the temperature of 00-900 DEG C, and the deformation temperature and the accumulated deformation amount in the rolling process are strictly controlled; cooling is conducted after rolling, and the cooling rate is controlled to range from 15 DEG C / s to 25 DEG C / s; (3) after rolling, heating to 850-900 DEG C for quenching, keeping the temperature for 15-30 minutes, and then quickly cooling; and tempering at 200-250 DEG C, and preserving heat for 1-2 hours. The strength and toughness of the anchor rod steel can be remarkably improved, collaborative optimization of the strength and plasticity is achieved, meanwhile, by improving the technological process, the production cost is reduced, the production efficiency is improved, and the method is suitable for large-scale industrial production of the high-strength anchor rod steel.

The invention discloses a preparation method and application of a composite phase-change gel material, and the composite phase-change gel material is prepared by combining an organic phase-change material, an inorganic phase-change material or a combination of the organic phase-change material and the inorganic phase-change material with a nucleating agent, a cross-linking agent and a porous material and optimizing a process. The phase-change gel material with high phase-change latent heat, long-acting cooling, excellent shape stability, good flexibility and cycle durability is prepared. A polyurethane gel matrix is adopted, the material is endowed with good flexibility and toughness, high thermal storage capacity is provided through an organic phase-change material, and meanwhile, due to introduction of an inorganic phase-change material, the morphological stability is improved, and the cooling duration is optimized. The porous material is adopted to fix the phase-change material through the capillary adsorption effect, leakage is prevented, the heat conductivity is improved, and the cooling rate is increased. The material prepared by the process can be stably cooled for 2-4 hours within the range of 24-33 DEG C, is suitable for cooling pads, pillows, summer sleeping mats and other products, and has excellent use performance and market application prospects.

The invention relates to a 1100MPa-grade high-strength carbon tool steel wire rod and a manufacturing method thereof, a carbon component design is adopted, the rolled and spun wire rod is subjected to online molten salt isothermal toughening treatment, and the wire rod is controlled to enter a sorbite phase region from a high-temperature austenite state at a cooling speed of more than or equal to 32 DEG C / s to form a structure mainly comprising fine lamellar spacing sorbite; the steel wire rod is controlled to be subjected to isothermal tempering, sorbite lamellar fusing promotion and toughening destressing treatment in an isothermal interval, and finally the steel wire rod with the microscopic structure comprising tempered sorbite, ferrite and fused sorbite is manufactured through roller way slow cooling, so that the material cost can be reduced, the overall strength and plasticity of the steel wire rod can be improved, the tensile strength is 1020-1070 MPa, the percentage reduction of area is 46%-51%, and the steel wire rod can be manufactured into the steel wire rod with the microstructure comprising tempered sorbite, ferrite and fused sorbite. Therefore, the tool part can be directly machined after cold machining, additional heat treatment after cold machining is omitted, the production cost and energy consumption of downstream users are reduced, and the production efficiency and the yield are improved.

The invention discloses a TA type three-stage planet carrier and a machining technology thereof, and relates to the technical field of three-stage planet carrier machining, the TA type three-stage planet carrier comprises a planet carrier body, a first plate and a second plate are connected through a plurality of sets of supporting columns distributed at equal intervals, and by arranging thermocouples on the surface of the three-stage planet carrier and at inner hole steps, the actual temperature is monitored in real time; the heat preservation time is calculated according to the thickness of the three-stage planet carrier, the heat preservation time is increased by 1-1.5 hours every time the thickness is increased by 15 mm, the temperature in the furnace is controlled to fluctuate within + / -3 DEG C, nitrogen with the purity larger than or equal to 99.99% is introduced into the furnace, oxidation is prevented, and the heat preservation time is increased by 1-1.5 hours every time the thickness is increased by 15 mm; and after the heat preservation time is finished, the temperature in the furnace is controlled to be reduced to 100 DEG C or below, and the product is taken out, and the cooling rate is smaller than or equal to 20 DEG C / h, so that the stress relief rate of stepped grooves formed in the three-stage planet carrier can reach 95% or above, normal use of the planet carrier can be guaranteed for a long time, and cracks of the stepped grooves are avoided.

The invention relates to the technical field of acetaminophen crystallization, in particular to a multi-stage continuous cooling crystallization device and method for acetaminophen. The invention provides a multi-stage continuous cooling crystallization method for acetaminophen, which comprises the following steps: S1, at least five stages of continuous cooling crystallization are adopted, and circulating water with a set temperature is injected into a jacket of a crystallization kettle during each stage of cooling crystallization; wherein during the first several stages of crystallization, the difference between the initial temperature of the material entering the crystallization kettle and the initial temperature of the circulating water is 13-25 DEG C; and during the last crystallization, the initial temperature of the material entering the crystallization kettle is 30-35 DEG C. According to the multi-stage continuous cooling crystallization method, different water temperatures are adopted to carry out gradient cooling on the materials, so that the problems of non-uniform grain size and low purity caused by crystal explosion due to large temperature difference between the materials and a refrigerant and high cooling rate in the early stage of cooling are avoided.

The invention discloses an SLM (selective laser melting) forming method of an In718 high-temperature alloy material, which comprises the following steps: selecting 15-35 mu m spherical powder, and carrying out ultrasonic screening, plasma activation and 50-100nm aluminum oxide coating modification to improve wettability and oxidation resistance; in an inert gas cabin, a platform is preheated at the temperature of 100-150 DEG C, and a pre-tightening layer with the density larger than or equal to 98% is formed through vibration auxiliary powder laying; a pulse fiber laser is adopted to dynamically modulate parameters, a thin-wall area and a solid area are matched with a spiral scanning path, and the cooling rate of a molten pool is reduced by 30%-50%; a molten pool is monitored through dual-wavelength infrared temperature measurement and a high-speed CCD, and laser frequency compensation and argon blowing stable convection are triggered; constructing a three-layer temperature gradient; by means of the method, the density and the high-temperature performance of the formed part are improved, and the method is suitable for manufacturing of aerospace complex structural parts.

The invention discloses an annealing treatment method for low-carbon steel, and relates to the technical field of metallurgical engineering. Comprising the following steps that steel to be annealed is placed in an annealing furnace with the preset temperature to be subjected to annealing treatment, and the annealing furnace comprises a heating section, a heat preservation section and a furnace cooling section which are continuously arranged in the moving direction of the steel; the preset temperature of a heating area is 690-715 DEG C, the preset temperature of a heat preservation area is 750 DEG C, and the preset temperature of a furnace cooling area is 730-525 DEG C; and the residence time of the steel in a heating section, a heat preservation section and a furnace cooling section is adjusted, the residence time of the steel in the heating section is 1.3-1.6 h, the residence time of the steel in the heat preservation section is 3.0-3.6 h, the residence time of the steel in the furnace cooling section is 2.9-3.5 h, and the cooling rate is 64-77 DEG C / h. By means of the method, the plasticity and toughness of the large-specification low-carbon steel can be remarkably improved, and the cold forging machining performance of the large-specification low-carbon steel is ensured.

A grain oriented electrical steel sheet is produced by heating a steel slab containing, by mass %, C:0.02-0.10%, Si:2.0-5.0%, Mn:0.01-1.00%, sol. Al:0.01-0.04%, N:0.004-0.020% and S+Se:0.002-0.040% to a temperature of higher than 1280° C., and subjecting the sheet to a hot rolling, a hot-band annealing, a single cold rolling or two or more cold rollings having an intermediate annealing between each cold rolling and a primary recrystallization annealing combined with a decarburization annealing, applying an annealing separator onto a steel sheet surface, and subjecting the sheet to a finish annealing and a flattening annealing, a rapid cooling is conducted at an average cooling rate of not less than 200° C. / s from 800° C. to 300° C. in the cooling process from a maximum achieving temperature in at least one annealing of the hot-band annealing and the intermediate annealing.

The invention discloses a porous metal structure and a preparation method thereof. The preparation method comprises the following steps: providing a cold-rolled alloy foil; recrystallization annealing treatment is conducted on the alloy foil, then first-time cooling treatment is conducted, and the alloy foil with a first component phase is obtained; the alloy foil is subjected to split-phase heat treatment, then secondary cooling treatment is conducted, so that a second component phase is separated out, the alloy foil with the first component phase and the second component phase is obtained at the same time, and the temperature of split-phase heat treatment is lower than that of recrystallization annealing treatment; the average cooling rate of the second cooling treatment is smaller than the average cooling rate of the first cooling treatment; and carrying out dealloying treatment on the alloy foil, then carrying out reduction annealing treatment in a reducing gas atmosphere, and then carrying out third cooling treatment to obtain the porous metal structure. According to the method, grain boundary corrosion cracks formed by dealloying treatment can be partially or even completely repaired, and the prepared porous metal structure can have good strength and toughness.

When a grain-oriented electrical steel sheet is produced by heating a steel slab containing, by mass %, C: 0.020 to 0.10%, Si: 2.0 to 4.0%, Mn: 0.005 to 0.50%, Al: less than 0.010%, N, S and Se: less than 0.0050% each to a temperature of not higher than 1280° C., subjecting slab to hot rolling, hot-band annealing, single cold rolling or two or more cold rollings having intermediate annealing between each cold rolling and a primary recrystallization annealing combined with decarburization annealing, applying annealing separator onto steel sheet surface, and subjecting steel sheet to finish annealing and a flattening annealing, a rapid cooling is conducted at an average cooling rate of not less than 200° C. / s from 800° C. to 300° C. in cooling process from maximum achieving temperature in at least one of hot band annealing and intermediate annealing, whereby grain-oriented electrical steel sheet having excellent magnetic properties is stably produced.

The invention discloses thermally induced phase separation normal-pressure special engineering plastic powder and a preparation method thereof, and belongs to the technical field of high polymer materials, and the method comprises the following steps: mixing special engineering plastic granules, a diluent and a functional additive, and heating and dissolving in stages to form a homogeneous solution; then cooling at the speed of 10-300 DEG C / min to induce solid-liquid phase separation, and solidifying and separating out powder particles; after the diluent is removed through an extracting agent, powder is obtained through reduced-pressure suction filtration, solvent cleaning and vacuum drying. The method is operated under normal pressure, the limitation of a traditional high-pressure method is broken through, the phase separation process is synergistically optimized by regulating and controlling the solubility parameter and the cooling rate of a compound diluent and a functional additive, accurate control over the morphology and the particle size of the powder is achieved, and the obtained powder is high in sphericity degree and narrow in particle size distribution and has excellent fluidity and melting performance; the method is suitable for high-end fields such as laser sintering and electrostatic spraying, and the process is green and environment-friendly.

Provided is a method of manufacturing a plated steel material having excellent workability and corrosion resistance according to an exemplary embodiment of the present disclosure and the method includes steps of immersing a base steel in a hot-dip alloy plating bath; and forming a hot-dip alloy-plated layer on the base steel by drawing the immersed base steel from the hot-dip alloy plating bath and performing a cooling process. A first average cooling rate in the cooling process varies depending on a difference between a first temperature that is a temperature of the hot-dip alloy plating bath and a second temperature that is a solidification start temperature of a MgZn2 phase constituting the hot-dip alloy-plated layer.

The invention relates to the technical field of extremely high vacuum acquisition, in particular to a process for reducing the surface air output rate of ferrite. The process comprises the steps of S1, pretreatment, S2, high-temperature degassing and S3, aftertreatment. Wherein the step S2 of high-temperature degassing comprises the following steps: placing the ferrite in a degassing furnace; vacuumizing the degassing furnace; starting a heating system of the degassing furnace, heating the ferrite to 500-600 DEG C at the heating rate of 1-2 DEG C / min, preserving heat for 0.5-1 hour, heating to 850-900 DEG C at the heating rate of 1-2 DEG C / min, preserving heat for 1-2 hours, cooling to 300-500 DEG C at the cooling rate of 1-2 DEG C / min, closing the heating system, and cooling the ferrite along with the furnace. According to the process, the surface gas outlet rate of the ferrite can be effectively reduced, the ferrite can be used for an extremely high vacuum system of 10 <-10 > Pa, and meanwhile, the situation that the ferrite is cracked and damaged in the degassing process can be avoided.

The invention discloses a high-strength and high-plasticity TA15 titanium alloy laser melting deposition component and a preparation method thereof, and an air heat treatment furnace is adopted to carry out double annealing heat treatment on a TA15 titanium alloy laser additive component. The TA15 titanium alloy laser additive component is loaded into an air heat treatment furnace, the temperature is raised to 860-1020 DEG C, the temperature raising rate is 200-300 DEG C / h, the TA15 titanium alloy laser additive component is subjected to air cooling to the room temperature after heat preservation is conducted for 2 h, and the cooling rate is 15-25 DEG C / min; and secondary annealing is conducted, specifically, the TA15 titanium alloy laser additive component is loaded into the air heat treatment furnace and heated to 600 DEG C, heat preservation is conducted for 4 h, then furnace cooling is conducted to the room temperature, and the cooling rate is 6-8 DEG C / min. The TA15 titanium alloy is subjected to two-stage annealing heat treatment, the primary alpha phase content of the TA15 titanium alloy laser melting deposition component is controlled, the microscopic structure is homogenized, and the strong plasticity of the TA15 titanium alloy laser melting deposition component is remarkably improved.