537 results about "Fine grain" patented technology

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 a shield muck heavy metal pollution intelligent sorting system and method based on multi-parameter online detection, and relates to the field of shield muck sorting, the shield muck heavy metal pollution intelligent sorting system comprises a muck sample pretreatment module, an online detection module, a pollution evaluation analysis module, a sorting execution module and a linkage control feedback module; the muck sample pretreatment module is used for separating coarse particles with the particle size larger than 50 mm and impurities in shield muck through a vibrating screen. According to the method, the initial value of the fine-grained soil content is detected in real time, data is automatically corrected based on a preset intelligent densimeter and a traditional densimeter difference correction model, rapid measurement is achieved, the detection efficiency is improved, a dynamic correlation model of fine-grained soil component changes is constructed by combining auxiliary parameters such as the muck weight, the water content and coarse grain grading, and the detection accuracy is improved. And the working condition adaptation module is linked to automatically improve the fine-grained soil detection frequency when the stratum mutation is identified by the shield PLC parameters, so that the data is ensured to closely follow the stratum change.

The invention relates to the technical field of nuclear fusion surface plasma W materials, in particular to nano rare earth oxide ceramic-Ti microalloy composite reinforced W powder, a composite material and a preparation method of the nano rare earth oxide ceramic-Ti microalloy composite reinforced W powder. The composite powder is of a nearly spherical core-shell hierarchical structure, and the particle size is 30-50 nm; according to the composite powder, refractory metal W serves as a matrix, nano rare earth oxide ceramic particles are evenly dispersed in matrix W crystal grains, Ti mainly forms an enrichment area on the surface of the matrix or a matrix / rare earth oxide interface in a simple substance or oxide mode, the phase interface structure is effectively improved, W crystal boundary migration and dislocation motion are hindered, W crystal grains are remarkably refined, and the composite powder is prepared. Part and W form semi-coherence, fine grain and interface strengthening and toughening are achieved, and a brand new thought and a technical method are provided for synergistically improving the strength and toughness of the W composite material. The composite powder is subjected to organic reduction synthesis and low-temperature reinforced sintering to prepare the composite material, the tensile strength at the room temperature reaches 500-610 MPa, and the ductility is 5%-8%.

The invention discloses a pyrochlore structure high-entropy ceramic solidified body material as well as a preparation method and application thereof, and belongs to the technical field of nuclear waste solidification. The preparation method of the high-entropy ceramic solidified body material with the pyrochlore structure comprises the following steps: weighing raw material powder of La2O3, Nd2O3, Sm2O3, Gd2O3, Eu2O3 and ZrO2 according to the proportion in (La0. 2Nd0. 2Sm0. 2Gd0. 2Eu0. 2) 2Zr2O7; the weighed raw material powder is subjected to ball milling treatment, and ball-milled powder is obtained; under the inert gas atmosphere, the ball-milled powder is subjected to heat treatment, and heat-treated powder is obtained; and carrying out spark plasma sintering on the heat treatment powder to obtain the pyrochlore structure high-entropy ceramic solidified body material. The powder is treated by using a heat treatment technology, so that the powder is homogenized, a pyrochlore phase is formed, grain growth is more favorably inhibited, a fine grain structure is obtained, and the irradiation stability and the mechanical property of the pyrochlore material are improved.

The present disclosure relates to the technical field of powder metallurgy, especially to a coarse grain cemented carbide and a preparation method thereof. Pseudo particles in coarse grain tungsten carbide are removed by pretreating process. Broken of the coarse grain tungsten carbide in traditional wet milling is avoid by solid-liquid stirring, spay granulating and surface covering, which also guarantee the uniform distribution of PEG and cobalt salt. Transformation from cobalt salt to cobalt is safely and effectively guaranteed by performing two sintering stages with different atmosphere and temperature to obtain a WC—Co mixture material. By performing spark plasma sintering process, the precipitation of nano fine grain tungsten carbide guarantees regrowth of defect occurred in pretreating process. The coarse grain cemented carbide with the average grain size of WC above 10 μm, the uniform cobalt phase distribution and be bending strength not less than 2200 MPa is prepared.

The invention provides a preparation method of a copper target material, and belongs to the technical field of metal target material preparation. According to the preparation method of the copper target material, the copper blank is subjected to hot rolling, thick columnar crystals in an original as-cast structure of the copper blank are crushed into fine grains through hot rolling, and the grain structure is more uniform; and the total volume of gaps among crystal grains is rapidly reduced, an original loose structure is compacted into a compact structure, densification treatment of the copper blank is achieved, and the dislocation density of the copper blank is increased. And then the copper target blank is cooled to 25-40 DEG C and then is subjected to cold rolling, crystal grains in the copper target blank are further rearranged, gaps between the crystal grains are further compressed, the crystal grain structure of the copper target blank is more compact, and the dislocation density is further improved. And finally, a temperature stepped annealing process is adopted, so that internal stress generated in the hot rolling and cold rolling processes can be effectively eliminated, and the hardness of the copper target blank cannot be excessively reduced due to the annealing process.

The invention relates to the technical field of material microstructure characterization, and discloses a method for improving ultrafine grain steel bar metallographic detection precision, which comprises the following steps: exciting a nanometer sonoluminescence probe covering the surface of a sample by using a focused sound field, and carrying out global scanning to obtain a reference grain boundary network image; automatically identifying regional interest points including a crystal boundary three-fork point and a signal interruption region from the image; aiming at different types of interest points, adaptively reconstructing a sound field mode or a scanning mode, and carrying out enhancement detection to obtain quantitative diagnosis information of the interest points; and finally, a multi-level interactive report integrating global morphology, key point labeling and local diagnosis is generated. According to the method, the uncertainty of a traditional chemical corrosion method is solved, an intelligent detection normal form from global general survey to local fine survey is realized, the recognition precision and diagnosis capability of defects such as early-stage microcracks are improved, and an objective, accurate and quantitative basis is provided for material performance evaluation.

The invention discloses a method for preparing coal and calcined kaolin through coal gangue grinding and grading-acid leaching-suspension calcination, and belongs to the technical field of coal gangue beneficiation. According to the method disclosed by the invention, the three stages of ore grinding flotation, acid leaching purification and fine grinding calcination complement each other, so that fine-grained calcined kaolin of which the content of-7 microns is greater than or equal to 90% and the whiteness is greater than or equal to 90% and ultrafine-grained calcined kaolin of which the content of-2 microns is greater than or equal to 90% and the whiteness is greater than or equal to 90% are prepared. According to the method, effective separation of coarse coal, leaching and purification of impurity iron elements and calcination and purification of fine-grained kaolin are realized through step grinding and step separation; the gas-solid reaction degree is improved and sintering is avoided by utilizing the dispersion and suspension characteristics of fine-particle materials; the dehydroxylation and decarburization reactions can be carried out completely by calcining fine materials and precisely controlling the temperature, so that the whiteness of the calcined kaolin product is remarkably improved. According to the method, the adaptability to coal gangue raw ore is improved, and meanwhile, a new thought is provided for efficiently preparing a calcined kaolin product from the coal gangue and cooperatively recycling coal resources.

The invention belongs to the field of engineering materials, and discloses an ultrahigh-strength steel plate with yield strength of 1500 MPa for engineering machinery and a manufacturing method of the ultrahigh-strength steel plate. Through reasonable component design and combination with proper rolling reduction, finish rolling temperature and quenching temperature, the microalloying effect of Nb, V and Ti is fully utilized, ultra-fine grain martensite is obtained, the effects of fine grain strengthening, precipitation strengthening and dislocation strengthening are fully exerted, the effects of C and alloy are exerted, and the Q1500 steel plate with the low carbon equivalent CEV is obtained. By means of the process, the high-strength steel plate which is good in production performance, easy to weld, 5-20 mm thick, 1500 MPa in yield strength and used for engineering machinery can be stably produced, and the high-strength steel plate is widely applied to large engineering machinery equipment such as crawler cranes and wheeled cranes.

The invention relates to the technical field of ore separation, and discloses a multi-stage photoelectric-jigging-magnetic separation synergistic efficient ore separation process which comprises the following steps: A, material pretreatment and particle size regulation and control: raw ore raw materials are treated through crushing and screening equipment; the method comprises the following steps of: adding the raw materials into a magnetic separator to obtain a coarse-fraction product with the particle size range of 5-100mm and a fine-fraction product with the particle size range of 0.5-5mm, and cleaning and drying the products to remove surface dust and pollutants. Sequential and parallel recognition and sorting of multi-dimensional physical attributes such as color (photoelectricity), density (jigging) and magnetism (magnetic separation) of ore particles are achieved, the function limitation of a single sorting method is overcome through the multi-technology coupling mechanism, and a large amount of waste rock is efficiently thrown at the front end through photoelectric pre-sorting; the enriched valuable minerals can be intensively treated by subsequent gravity separation and magnetic separation equipment, and the unit operation efficiency is improved.

The invention belongs to the technical field of medium-entropy ceramic materials, and relates to a preparation method of a yttrium-zirconium-cerium ternary medium-entropy oxide ceramic material, which comprises the following steps: weighing Y2O3 powder, ZrO2 powder and Ce02 powder according to a molar ratio of 1: 2: 2, carrying out ball-milling mixing to obtain mixed powder, drying the mixed powder, prepressing into a blank, carrying out microwave sintering, and carrying out sintering to obtain the yttrium-zirconium-cerium ternary medium-entropy oxide ceramic material. Synthesizing a yttrium-zirconium-cerium ternary medium-entropy oxide (Y1 / 3Zr1 / 3Ce1 / 3) O2 ceramic material with an equal molar ratio; according to the invention, the raw materials are simple, the preparation steps are simple, the production efficiency is high, the microwave sintering technology is low in sintering temperature and short in sintering time, microwave is utilized to reduce activation energy of substances to accelerate sintering and generate uniform fine grains, and internal pores of the fine grains are small and round, so that the sintered material has good stability and reprocessability; according to the process, green and continuous production is easy to realize, the production scale and efficiency are further improved, and a new way and thought are provided for industrial microwave sintering preparation of the medium-entropy oxide ceramic material.

The invention relates to the technical field of wrought superalloy processing, in particular to a GH4169 superalloy bar and a preparation method and application thereof. Through the design of triple smelting, twice homogenization treatment, forging, hot rolling and cold drawing processes, the GH4169 high-temperature alloy bar is prepared, the specification of the obtained bar can be as small as phi8mm-phi12mm, the structure from the center to the edge is uniform, strip segregation is avoided, the grain size can be stably controlled to 7-8 grades, namely, the grain size is 20-30 microns, the grade difference is smaller than or equal to 1 grade, and mixed crystals are avoided; the room-temperature tensile strength is greater than or equal to 1300MPa; the high-temperature tensile strength at 650 DEG C is larger than or equal to 1000 MPa, the high-temperature lasting time at 650 DEG C / 690 MPa is larger than or equal to 23 h, the high-temperature lasting elongation rate is larger than or equal to 4%, the comprehensive mechanical property is excellent, and the technical problems that the grain size of a small-specification GH4169 alloy bar prepared through an existing technology is 10 levels or above, grains are too fine, and mixed crystals are likely to happen are solved.

The invention provides a cold machining manufacturing method of an ultra-fine grain seamless steel pipe. The method comprises the following steps: firstly, selecting a low-alloy structural steel billet with specific components, which comprises C, Si, Mn and microalloy elements of Nb, V and Ti, and heating, perforating and hot-rolling to prepare a pierced billet; and then multi-pass cold deformation treatment is carried out, 5-8 times of cold drawing or cold rolling is carried out on the pierced billet, the deformation of each pass is not lower than 30%, the cold drawing or cold rolling is carried out at the room temperature at the specific speed, and natural cooling is carried out between the passes. Recrystallization annealing is carried out after each pass of cold deformation, heat preservation is carried out for 1-2 hours at the temperature of 650-750 DEG C, and then controlled cooling is carried out. And finally, a finished product is obtained through straightening, head and tail cutting and nondestructive testing. According to the method, through cyclic cooperation of multi-pass cold deformation and recrystallization annealing and the effect of synergistically inhibiting grain growth of microalloy elements, the internal structure of the steel pipe is fully refined and homogenized, and then the comprehensive mechanical properties of the strength and toughness of the finished seamless steel pipe are remarkably improved; and meanwhile, the technological process is stable and controllable, and the product surface quality is excellent.

The invention belongs to the technical field of powder metallurgy materials, and particularly relates to a high-toughness ultra-fine grain WC-Co hard alloy and a preparation method thereof.The preparation method comprises the following steps that S1, ultra-fine grain tungsten carbide powder, nanocrystalline tungsten carbide powder, cobalt powder and a grain inhibitor are obtained to serve as raw materials, the ultra-fine grain tungsten carbide powder and the nanocrystalline tungsten carbide powder are subjected to ultrasonic dispersion, vacuum reduction and spray drying, and then composite tungsten carbide powder is obtained; s2, cobalt powder and a grain inhibitor are mixed and then subjected to first ball milling to obtain a first mixed material, the first mixed material and composite tungsten carbide powder are mixed and then subjected to second ball milling to obtain a second mixed material, and the second mixed material is subjected to third ball milling to obtain a third mixed material; and S3, drying, pressing, sintering and cooling the third mixture to obtain the hard alloy. By optimizing the ball milling process and the sintering process and adopting the novel dispersing agent and the grain inhibitor, the fracture toughness and the bending strength of the material can be remarkably improved while high hardness can be guaranteed.

The invention relates to a preparation method of a high-hardness composite coating on a titanium alloy surface, which comprises the following steps: pretreating a titanium alloy base material to remove a surface oxide layer to obtain the treated titanium alloy base material; prepared high-entropy alloy powder is dried and evenly laid on the surface of the treated titanium alloy base material, and the titanium alloy base material with the powder laid is obtained; performing laser cladding treatment on the titanium alloy base material subjected to powder laying in a protective gas atmosphere to obtain a high-entropy alloy strengthened coating; the particle size of the powder is controlled to be 65-90 microns. The Al powder, the Co powder, the Ni powder, the Ti powder and the B powder with the purity higher than 99.5 wt% are selected as raw materials, the high-entropy alloy powder and the high-strength titanium alloy matrix are molten on the surface of the high-strength titanium alloy through a laser high-energy heat source, the metallurgical bonding effect is achieved, high-entropy phase strengthening is achieved, grains can be fine, and the hardness and abrasion resistance of a surface coating can be improved. The surface hardness of the coating prepared by laser cladding of the high-entropy alloy powder on the surface of the titanium alloy is not lower than 677 HV, and the wear resistance is not lower than 1.128 hmm.

The invention discloses high-strength heat-resistant aluminum-copper alloy powder, a 3D printing application method and an aluminum product. Relates to the technical field of metal material and additive manufacturing, in particular to a high-strength heat-resistant aluminum alloy material suitable for selective laser melting. The alloy powder is composed of Cu, Sc, Ni, Ce, Si, Mn, Ti, Fe and Al, the content of Cu ranges from 5 wt% to 15 wt%, the content of Sc ranges from 0.3 wt% to 2 wt%, the content of Ni ranges from 0.5 wt% to 5.5 wt%, the content of Ce ranges from 0.5 wt% to 5.5 wt%, and an Al7Cu4Ni eutectic phase is generated in situ in the printing process. And through a multi-element synergistic strengthening mechanism, the solidification interval is effectively reduced, cracks are inhibited, and meanwhile fine grain strengthening and precipitation strengthening are achieved. After SLM forming and low-temperature heat treatment, the obtained aluminum product has ultrahigh strength, good plasticity and excellent heat resistance, the tensile strength exceeds 650 MPa, the hardness exceeds 180 HV0.2, the ductility exceeds 7%, and the aluminum product meets the requirements for light high-strength heat-resistant components in the high-end fields such as aerospace and the like.

A flashbutt joint member having excellent processability of a joint portion and a welding method thereof are provided. The present disclosure relates to a joint member having excellent processability and a manufacturing method thereof, and in a joint member having a joint portion obtained by flashbutt welding a butt joint portion of a steel sheet using an electrode, an average hardness difference between a coarse grain heat-affected zone and a fine grain heat-affected zone formed on any one of left and right sides of the joint portion, based on a joint line (joint interface) is within 50 in Vickers hardness.

Described herein are novel construction material compositions, systems, and methods for manufacturing the same. Biocement technologies that monitor and adjust environmental and process controls during the manufacturing of biocement products are described. In some cases, during manufacturing of a construction material various manufacturing parameters including feed rate, feed pressure, feed molarity, feed rate profile, feed pH level, temperature, humidity, the percentage of fine limestone within an aggregate mix, the thickness of a pre-feed crust layer may be set and / or adjusted over time to reduce manufacturing time and to improve the structural integrity of a construction material.

The invention provides a niobium rod for an Nb3Sn superconducting wire niobium material and a preparation method of the niobium rod, and the preparation method of the niobium rod comprises the following steps: a, upsetting and drawing forging: carrying out n times of upsetting and drawing forging on a niobium cast ingot, n is any integer in 2-5, and carrying out annealing heat treatment in a gap between two times of upsetting and drawing forging or after the last upsetting and drawing forging, the upsetting and drawing forged round bar is obtained; b, radial forging is conducted, specifically, the upsetting and drawing forging round bar is subjected to radial forging; and c, rotary forging: carrying out rotary forging on the rod blank subjected to radial forging. The niobium rod prepared by the method meets one or more of the following items: the grain size is 7-8 grades, the elongation at break is greater than or equal to 40%, and the hardness (HV / 2.9 N) is greater than or equal to 40 and less than or equal to 65. Namely, the niobium rod prepared by the preparation method has at least one of the characteristics of uniform and fine grains, low hardness and high plasticity, and the comprehensive performance of the niobium rod is improved, so that the strict requirements of the Nb3Sn superconducting wire on the base material in high-field magnet application are met.

The invention discloses a method for preparing YAG transparent ceramic by two-step sintering, which comprises the following steps: 1) weighing yttrium oxide powder and aluminum oxide powder according to a stoichiometric ratio, mixing, and carrying out solid-phase reaction to synthesize YAG powder; 2) performing dry grinding and wet grinding on the obtained YAG powder to obtain mixed slurry; 3) drying the obtained mixed slurry to obtain powder, and performing compression molding and cold isostatic pressing to obtain a ceramic biscuit; and 4) pre-sintering the obtained ceramic biscuit in an oxygen-containing atmosphere, embedding the pre-sintered ceramic with oxide particles, and carrying out hot isostatic pressing sintering to prepare the YAG transparent ceramic. On the basis of obtaining the YAG transparent ceramic with high optical quality, a microstructure with a fine grain size can be obtained, and good mechanical properties are considered; the preparation method is simple, the equipment cost and energy consumption are low, the traditional annealing step can be omitted, and a new thought can be provided for preparation of the high-performance YAG transparent ceramic.

The invention discloses round steel for a phi 300mm large-specification petroleum valve body and a production method of the round steel. The round steel comprises the following chemical components in percentage by weight: 0.17%-0.20% of C, 0.20%-0.30% of Si, 1.23%-1.35% of Mn, 0.015%-0.030% of Al, 0.005%-0.015% of V and the balance of iron and inevitable impurities. On the basis of solution strengthening of C and Mn, V, Al and other fine-grain alloy elements are designed and added, dispersed precipitation of carbon and nitride fine particles and solution strengthening of the V and Al elements are achieved through controlled rolling to refine grains, the strength and toughness of the round steel are greatly improved, it is guaranteed that the grains are fine, and the normalized V-type-50 DEG C low-temperature impact of the round steel is larger than 100 J; and the grain size in the hot rolling state is 6.5-7.0 grade, and the requirements of downstream customers can be completely met.

A preparation method of a Ti-5553 titanium alloy plate with a grade fine grain double-state structure adopts cross-phase transformation point free forging to prepare a Ti-5553 titanium alloy plate blank, in the cross-phase transformation point free forging, the initial forging temperature of a forging stock is in a temperature zone of 45-95 DEG C above the phase transformation point, the lower limit of the final forging temperature is 650 DEG C, short-process and low-cost preparation of the plate blank is achieved, and the production cost is reduced. And the surface integrity and the deformation uniformity in the thickness direction of the plate blank in the hot rolling process in the temperature zone below the subsequent phase transformation point are guaranteed through the fine grain structure. According to the method, the strain range of a single pass is 0.2-0.25, the strain value of the single pass is larger than or equal to the critical formation strain of DDW of the Ti-5553 alloy, and therefore the number of DDW in the alloy can be increased through hot rolling in the temperature zone below the phase transformation point of each pass. The DDW in the plate is sharply increased after multi-pass hot rolling in the temperature zone below the phase transformation point, and grain refinement is sufficient. The microscopic grain size of the Ti-5553 hot-rolled plate prepared by the method is higher than 7 grade.

The invention belongs to the technical field of metal materials, and discloses precipitation-hardening stainless steel and a preparation method thereof. Through cooperative regulation and control of component design and process innovation, the traditional contradiction of'strength-plasticity inversion 'in additive manufacturing of the precipitation-hardened stainless steel is broken through, and the precipitation-hardened stainless steel with excellent strength and plasticity is prepared. On one hand, the N element is introduced into the precipitation-hardening stainless steel raw material powder, so that transformation from ferrite to austenite in the additive manufacturing process is promoted; on the other hand, in the additive manufacturing process, the substrate is subjected to in-situ heating to be close to the martensite phase transformation initial temperature, and transformation of austenite to martensite is restrained; and after printing is finished, global martensite phase transformation is triggered through natural cooling or air cooling, so that a total martensite structure with fine grains and high dislocation density is obtained. And finally, through aging treatment, precipitation of a nano Cu phase is induced, formation of austenite is reversed, and therefore the strength and plasticity of the precipitation-hardened stainless steel are improved at the same time.

The utility model provides a solid-liquid mixing device for a micro-fine particle material mixed solution, and relates to the technical field of industrial devices. The device comprises a material tank, a solution tank, a stirring barrel and a discharging roller pair, the interior of the material tank is used for storing powder type solid materials, and a material discharging opening is formed in the bottom of the side wall of the material tank; the solution tank is used for storing liquid materials, and a solution discharge port is formed in the bottom of the side wall of the solution tank; the stirring barrel is arranged between the material tank and the solution tank, the material discharging port is connected with a material spraying pipe in the stirring barrel, the solution discharging port is connected with a liquid spraying pipe in the stirring barrel, the material spraying pipe and the liquid spraying pipe are located at the same height and opposite in spraying direction, a stirring paddle is arranged in the stirring barrel, and a spraying nozzle is arranged at an outlet of the liquid spraying pipe; the discharging roller pair is arranged at the discharging opening in the bottom of the stirring barrel, the discharging speed of the stirring barrel can be adjusted by adjusting the rotating speed of the discharging roller pair, full infiltration and mixing of micro-fine particle materials and a solution can be achieved, continuous operation of mixed materials is achieved, the discharging speed is controlled, and the discharging opening is prevented from being blocked.

The invention belongs to the technical field of mechanical manufacturing and material science, and particularly relates to an artificial intelligence chip inductor powder mold surface strengthening treatment method and system, which comprises the steps of mold matrix mechanical shock strengthening pretreatment, preparation of a gradient diffusion layer, a toughness bonding layer and a superhard wear-resistant layer in sequence without breaking vacuum, and post-treatment. The system is integrated vacuum treatment equipment and realizes continuous treatment without breaking vacuum. Surface mechanical shock strengthening is introduced in the pretreatment stage of a mold base body, and a strengthening layer with a fine grain structure, high-density dislocation and remarkable residual compressive stress is formed on the surface layer of the mold. According to the strengthening layer, the fatigue strength and the plastic deformation resistance of the mold base body are effectively improved, a tough bearing substrate is provided for growth of the subsequent surface strengthening layer, and therefore the problem that the binding force between a traditional strengthening layer and a brittle base body is insufficient is fundamentally solved, and the fatigue fracture resistance of the whole mold structure is remarkably improved.

The invention discloses a method and device for preparing a mixed crystal structure material through friction stir solid-phase deposition, and belongs to the technical field of heterostructure material preparation. According to the method, firstly, a deposition head is used for carrying out single-layer friction stir solid-phase deposition on a needed material, then a special corrugated roller is used for carrying out cold rolling to enable different positions of the surface of the deposition material to be subjected to different degrees of cold deformation, and therefore uneven high dislocation density is introduced into a deposition layer, and then next-layer friction stir solid-phase deposition is carried out on the surface of the deposition layer. In the friction-stir solid-phase deposition process, static recrystallization and static recovery rapidly occur in a local high-dislocation-density area to maintain fine grains, and grain growth rapidly occurs in a low-dislocation-density area due to heating, so that the whole deposition layer shows the mixed crystal structure characteristic that fine grains and coarse grains coexist; the block mixed crystal structure material can be prepared through stirring friction solid phase deposition and cold rolling circulation.

A process for manufacturing compact coils of ultra-fine grained martensite-free steel bars, the process comprising the following phases: a) rolling a billet by means of a roughing mill (1) of the steel bar; b) performing at least one first cooling stage (2) so that the steel bar has a surface temperature higher than the martensite start temperature (Ms) and at least one first equalization stage in air; c) rolling the steel bar by means of at least one intermediate mill (3); d) performing at least one second cooling stage (4) always keeping the surface temperature higher than the martensite start temperature (Ms) and at least one second equalization stage in air; e) rolling the steel bar by means of a finishing mill (5) in the non-recrystallization temperature range, keeping the entire cross section of the steel bar in said non-recrystallization temperature range and wherein the total reduction is between 25% and 50% with respect to the cross section of the steel bar at the inlet of the finishing mill, so as to obtain an ultra-fine grained austenitic matrix; f) winding the steel bar into compact coils by means of at least one winding device (7) so that the ultra-fine grained austenitic matrix transforms into a mixture of ferrite and pearlite. After the winding operation is completed, the compact coils can be conveyed to a storage area by means of a conveying device (8), for example a walking beam, in which the coils are subjected to natural cooling or forced cooling or delayed cooling.

The application discloses a recovery method for separating titanium from titanium-containing iron tailings, which comprises the following steps: slurry-making of the titanium-containing iron tailings to reach the concentration requirement of a first-stage high-intensity magnetic separation; first-stage high-intensity magnetic separation of the titanium-containing iron tailings, so that the magnetic material enters a grading grinding process; iron removal of the magnetic material after the grading grinding process to obtain iron concentrate; spiral chute gravity separation of the slurry after the iron removal, so that the gravity separation concentrate is used as titanium concentrate, and tailings enter a grading concentration process; the non-magnetic material after the first-stage high-intensity magnetic separation and the tailings after the gravity separation both enter the grading concentration process; coarse-grained material after the grading concentration enters a second-stage high-intensity magnetic separation, so that the concentrate is used as secondary titanium concentrate, and the tailings and fine-grained material after the grading concentration both enter a cloth chute gravity separation, so that the gravity separation concentrate is used as the secondary titanium concentrate, and the gravity separation tailings are discharged into a tailings pond or are dry discharged. The method increases the secondary titanium concentrate product, can improve the recovery rate by more than 15%, and improves the economic benefits.

The present application relates to the technical field of metal smelting, and particularly relates to a glass-sealed high-chromium ferrite stainless steel wire rod, which comprises the following components in percentage by mass: C: 0.030%, Cr: 27.20-27.80%, Ni: 1.10-1.50%, Cu: 0.20%, Nb: 0.10-0.20%, Mn: 0.40-0.70%, Si: 0.20-0.50%, P: 0.010-0.020%, S: 0.005%, N: 0.040%, and the balance of Fe and inevitable impurities. The present application also relates to a preparation method of the stainless steel wire rod, which comprises the following steps: sequentially subjecting raw materials to electric arc furnace smelting, AOD smelting, LF smelting, continuous casting, hot delivery rolling, and solid solution process treatment, and finally obtaining a stainless steel wire rod product. Through optimization of the stainless steel component design and production process conditions, the material has good surface quality, excellent plasticity and toughness, fine grain size, and reasonable thermal expansion coefficient, and the manufacturing process is simple, and batch production can be carried out.

The invention discloses a suspension graded and segmented calcining system, which relates to the technical field of ore decomposition and comprises a scattering box and a suspension furnace body, and a first-section calcining furnace, a second-section calcining furnace and a third-section calcining furnace are respectively and fixedly mounted at the bottom end of the suspension furnace body from left to right. By arranging the suspension furnace body, the first-section calcining furnace, the second-section calcining furnace and the third-section calcining furnace, when the system is used, particles are graded by utilizing flue gas, and when the settling velocity of a material with a certain critical particle size is smaller than the flow velocity of the flue gas, the material can be completely carried by the flue gas to ascend and move forwards along with the flue gas along the furnace body. The suspension furnace body is provided with a plurality of ascending sections and descending sections, and flue gas is utilized for grading. By means of the method, efficient graded calcination is directly carried out on the fine ore with the particle size smaller than 5 mm, and the problem that grinding pretreatment needs to be carried out on the fine ore with the particle size smaller than 5 mm in an existing suspension calcination process is solved.