38results about How to "Improve tissue uniformity" patented technology

The invention relates to a high-plasticity GH4141 alloy cold-drawn bar with a uniform structure and a preparation method of the high-plasticity GH4141 alloy cold-drawn bar, belongs to the field of high-temperature alloy materials, and solves at least one of the problems that in the prior art, a GH4141 bar is poor in grain size uniformity, and a fastener is poor in performance stability, low in forming qualification rate and the like due to insufficient plasticity. The preparation method of the high-plasticity GH4141 alloy cold-drawn bar with the uniform structure comprises the steps that a hot-rolled GH4141 alloy bar blank is subjected to solution treatment, and then first-time cold drawing, first-time intermediate annealing treatment, second-time cold drawing, second-time intermediate annealing treatment, finished product cold drawing and finished product annealing treatment are sequentially carried out. According to the method, the plasticity is remarkably improved while the strength of the GH4141 alloy cold-drawn bar is guaranteed, and the upsetting qualification rate of a fastener and the product performance consistency are effectively improved.

This invention relates to the field of gray cast iron material preparation technology, and particularly to a method for preparing multi-alloy synergistically strengthened gray cast iron, comprising: adding steel raw materials to a smelting apparatus and heating to form molten iron; adding a chromium alloy to the molten iron, heating and holding at that temperature to form a basic mixture; determining the degree of furnace lining peeling based on the vibration frequency of the smelting apparatus, and determining the overheating risk level of the basic mixture based on the degree of furnace lining peeling; determining a target heating temperature based on the overheating risk level; determining the eddy current risk level based on the actual rotation speed; adjusting the stirring intensity during the smelting process based on the eddy current risk level; detecting the mixing ratio of the basic mixture and adjusting the amount of steel raw materials or the chromium alloy added to form a target solution; and simultaneously adding manganese nitride, alloyed tin, and ferrous sulfide to the target solution in a specified ratio to form multi-alloy synergistically strengthened gray cast iron. This invention improves the strength, toughness, fluidity, and resistance to solidification defects of gray cast iron.

This invention belongs to the field of alloy preparation technology, and specifically relates to a TB5 titanium alloy wire and its cold drawing preparation method. Firstly, the forging and rolling of the TB5 titanium alloy involves selecting a large deformation amount and a low processing temperature, effectively ensuring that the coarse microstructure is broken down to a certain extent, improving the internal structure and increasing plasticity. Then, the surface oxide scale of the TB5 titanium alloy wire is removed to avoid introducing oxygen, hydrogen, nitrogen, and carbon elements. Next, online solution treatment is used to regulate the microstructure, improving the cold working performance and microstructure uniformity of the wire. Finally, roll drawing is performed to cold work the wire to reduce its diameter, effectively avoiding problems such as film adhesion and surface scratches, extending the service life of the drawing die. Simultaneously, the TB5 titanium alloy wire exhibits good grain size and microstructure uniformity, meeting the requirements for use. The final TB5 titanium alloy wire is delivered directly in a bright state and can be used for subsequent processing.

This invention relates to a steel for automobile engine pistons and its manufacturing method. The chemical composition of the steel, by weight percentage, is: C: 0.41–0.47%, Si: 0.15–0.35%, Mn: 0.70–1.00%, Cr: 1.10–1.40%, P: ≤0.020%, S: 0.015–0.035%, Mo: 0.17–0.27%, Al: 0.010–0.030%, N: 0.0040–0.0060%, with the balance being Fe and unavoidable impurities. The microstructure consists of ferrite and pearlite, with uniform distribution of ferrite and pearlite structures. The geometric center distance between each ferrite and pearlite structure is 15–30 μm. The hot-rolled hardness of the steel is ≤230 HBW, and the banded structure in the steel is ≤1.5 grade. The product features a narrow range of carbon deviation in cross-section, shallow decarburized layer and microcrack depth on the steel surface, low hot-rolled hardness, good banded structure, and high tensile strength after quenching and tempering.

The application aims to provide a device and a process method for preparing fine-grain magnesium alloy through multi-petal staggered torsion composite extrusion, and belongs to the technical field of plastic processing of metal materials.The device comprises a die holder, and a lower concave die is arranged on the inner side of the die holder.The lower concave die is a fixed deformation concave die with a necked channel at the lower side, the top end of the necked channel is provided with an upper convex die, the outer side wall of the upper convex die is provided with a wedge-shaped block, and the wedge-shaped block is embedded in a wedge-shaped guide groove in the inner side wall of the lower concave die.The upper convex die is a funnel-shaped deformation die, which comprises eight fan-shaped convex die petals that are sequentially wedged, and the inner side wall of the fan-shaped convex die petal is a fan blade curved surface.The initial state of the fan-shaped convex die petal is high-low interval arrangement.Through the use of the application, the magnesium alloy blank can be subjected to continuous, uniform and significantly accumulated strain severe plastic deformation in a single extrusion process, the grain structure is significantly refined and the texture is weakened, the tensile strength, yield strength and elongation of the magnesium alloy at room temperature are greatly improved, and the preparation cost is reduced.

This invention discloses a method for preparing high-entropy ceramic matrix composites using a reactive infiltration process, belonging to the technical field of ceramic matrix composites. The steps are as follows: at least four single-component carbides are ball-milled and mixed with a carbon source, then dispersed in a dispersion liquid to obtain a slurry; continuous fibers are woven into a preform, and an interface layer and a matrix layer are deposited to obtain a semi-dense composite material; the slurry is introduced through vacuum or pressure impregnation; and a high-entropy carbide matrix is ​​generated in situ and densified by reactive infiltration after embedding with a transition metal and its alloy. This invention solves the problems of long process cycles, high porosity, high cost, and insufficient introduction of high-entropy ceramics in existing processes, achieving rapid densification and improving the material's high-temperature stability, oxidation resistance, and ablation resistance. It is suitable for the large-scale production of thermal protection materials for hypersonic vehicles.

The present application relates to a kind of high-precision cold-rolled screw with medium carbon steel hot rolled wire rod in metallurgical technology field, preparation method and application.The present application is aimed at solving the technical problems of low first processing qualified rate of cold-rolled screw caused by poor material organization uniformity and low purity.The chemical composition of the wire rod according to the present application is as follows: C 0.52-0.58%, Si 0.15-0.35%, Mn 0.70-0.90%, Cr 0.10-0.35%, Al 0.015-0.045%, Ti≤0.0025%, [O]≤0.0015%, [N]≤0.0060% and the like, with the balance being Fe.The preparation method of the present application obtains uniform organization with cross-section hardness range ≤20HV through the combined action of narrow component design, continuous casting end electromagnetic stirring, high temperature diffusion annealing and "fast first and slow later" controlled cooling process.The present application is mainly used for manufacturing high-precision ball screw, and the finished product precision reaches more than 5 levels, with first cold-rolled forming qualified rate ≥85%.

The invention relates to the technical field of precious metal metallurgy, and discloses a high-density iridium ingot sedimentation type smelting process which comprises the following steps: preparing a water-cooled copper crucible with a zirconium oxide inner wall coating; iridium powder and calcium oxide powder are mixed and put into a crucible; performing induction heating in a vacuum environment until the raw materials are molten; protective gas is inflated, periodic variable-pressure oscillation operation is applied under the condition that the temperature of the melt is kept, and slag crust on the surface of the melt is destroyed through pressure fluctuation and deep gas is promoted to be exhausted; after oscillation is stopped, the melt is left to stand, and a slag system floats upwards and is separated; and establishing a bottom-to-top temperature gradient to control directional solidification of the melt. According to the invention, oxide hard shells are destroyed through a variable-pressure oscillation mechanism, and efficient degassing and impurity removal are realized by cooperating with calcium oxide slagging; the zirconia coating effectively prevents the crucible material from being polluted; the directional solidification and hot isostatic pressing process eliminates internal shrinkage cavities and looseness. According to the process, the impurity content in the iridium ingot is remarkably reduced, and the purity and compactness of the material are improved.

This invention relates to a large-size, high-density, high-carbon, high-silicon hot-rolled round steel bar and its preparation method. The chemical composition of the hot-rolled round steel bar, by weight percentage, includes: C: 0.60%~0.70%, Si: 1.70%~1.95%, Mn: 0.80%~0.90%, P≤0.015%, S≤0.015%, Cr: 0.80%~0.90%, Ni: 0.20%~0.25%, Mo: 0.05%~0. 0.10%, Al: 0.015%~0.035%, N: 0.0045%~0.010%, with the remainder being Fe and unavoidable impurities; it can balance toughness and wear resistance, and under the high carbon, high silicon, and high chromium composition system, it can effectively improve the internal density of hot-rolled round steel with a maximum φ110mm specification, meet the stringent flaw detection requirements of equivalent "≤φ1.3", and is suitable for the high-strength and high-wear working conditions of coarse copper ore grinding balls.

This application relates to the field of metallic materials technology, disclosing a highly formable aluminum alloy material, an aluminum alloy sheet, and a method for preparing the same. The aluminum alloy sheet, by mass percentage, comprises: Fe 0.8%~1.2%, Mn 0.4%~0.8%, Zr 0.1%~0.3%, Si 0%~0.05%, Cr 0.1%~0.3%, with the remainder being Al and other unavoidable impurity elements. The total content of Fe and Mn ranges from 1.45% to 1.6%. The method for preparing the aluminum alloy sheet includes: preparing an aluminum alloy melt; continuously casting the aluminum alloy melt to obtain a billet; continuously rolling the billet to obtain a hot-rolled sheet; and performing a first cold rolling on the hot-rolled sheet to obtain the aluminum alloy sheet. This application can improve the strength, plasticity, and deep-drawing performance of the aluminum alloy material, achieve high formability, simplify the process flow, improve efficiency, and reduce energy consumption.

The utility model is suitable for the technical field of spheroidizing agent smelting, and provides spheroidizing agent smelting equipment which comprises a shell, a barrel assembly is arranged at the top of the shell, a liquid injection assembly is arranged at the top of the barrel assembly, and a stirring assembly is installed at the bottom of the barrel assembly. The liquid injection assembly comprises an iron liquid injection port for injecting iron liquid and a nodulizing agent injection port for injecting a nodulizing agent; the cylinder assembly comprises a cylinder, a spheroidizing agent diffusion module is arranged at the top of the cylinder and comprises an annular pipeline, a square hole is formed in the annular pipeline, the spheroidizing agent injection port is formed in the square hole, a plurality of sets of longitudinal pipelines are arranged at the bottom of the annular pipeline in a surrounding mode, the longitudinal pipelines are attached to the cylinder, and the longitudinal pipelines are connected with the cylinder. And a plurality of groups of discharge holes are formed in each group of longitudinal pipelines. The device solves the problem of non-uniform smelting reaction of the spheroidizing agent, and achieves the effects of uniform distribution and uniform reaction of the spheroidizing agent through the spheroidizing agent diffusion module and the stirring assembly.

The invention provides an ultrafast laser in-situ composite cladding repair method, and relates to the field of metal material repair. The ultrafast laser in-situ composite cladding repair method comprises the following steps: pretreating a to-be-repaired area of a titanium alloy defect part; cladding repair is conducted on the pretreated titanium alloy defect part through cladding laser, and a molten pool is formed; and the ultrafast impact laser acts on the molten pool so as to induce to generate impact waves to conduct impact forging on the molten pool. According to the method, the microscopic structure of the repairing layer can be remarkably refined, the Widmannstatten needle-shaped alpha phase is short, small and uniformly distributed, the grain size is obviously reduced, and the structure is more compact and uniform; and the microhardness of the repairing layer is effectively improved through the refined microscopic structure, and the mechanical property of the material is enhanced. According to the method, the structure uniformity and hardness of the repairing layer can be remarkably improved, and the requirement for high-performance repairing of the titanium alloy defect part is met.

The application discloses a kind of multi-modal adaptive furnace temperature control method, system and continuous annealing furnace based on space-time thermal field decoupling, multiple independent heating zones are provided in the continuous annealing furnace, multiple groups of staggered arrangement burners are arranged in each heating zone, four-stage adaptive control strategy based on temperature ratio segmentation and thermal field space-time distribution collaborative control, including: fast response heating zone, proportional regulation transition zone, pulse cross uniform zone, dynamic thermal field maintenance zone. By decoupling furnace temperature control and thermal field spatial distribution, using the way of spatial grouping pulse activation + time staggered control, the rapid response, accurate regulation and uniform maintenance of furnace temperature are realized.The application effectively solves the technical problems of temperature overshoot, response lag, thermal field unevenness, high energy consumption and other technical problems in the traditional control mode, significantly improves the quality of strip steel heat treatment and energy utilization efficiency.

This invention belongs to the technical field of additive manufacturing technology and discloses an in-situ oxygen-controlled composite scraper and a laser selective melting device equipped with the in-situ oxygen-controlled composite scraper. The bottom of the composite scraper includes a second scraper (16), an air jet unit, and a first scraper (18) arranged sequentially along the powder spreading direction. It has an internal gas storage chamber (15) and a powder drop chamber (19). The first scraper is used to evenly spread the powder raw material to form an initial powder layer. The air jet unit performs in-situ oxidation treatment on the surface of the initial powder layer by spraying oxygen-containing gas. The second scraper is used to level and compact the powder layer after the in-situ oxidation treatment. This invention improves the composition and structure of the composite scraper and utilizes the overall cooperation of the first scraper, the air jet unit, and the second scraper to generate a synergistic mechanism of powder spreading, in-situ oxidation, and secondary compaction, breaking through the process limitation that it is difficult to construct oxide dispersion-strengthened structures in-situ during additive manufacturing.

The application provides an aluminum alloy plate and a preparation method thereof. The preparation method comprises the following steps: S1, first heating a first ingot to 280-320 DEG C and then first holding for 0-8 hours to obtain a second ingot; S2, second heating the second ingot to 380-420 DEG C and then second holding for 0-6 hours to obtain a third ingot; S3, third heating the third ingot to 435-465 DEG C and then third holding for 4-16 hours to obtain a fourth ingot; S4, sequentially performing fourth holding and hot rolling on the fourth ingot to obtain the aluminum alloy plate; the temperature of the fourth holding is 430-460 DEG C; when cold rolling is performed after the hot rolling, intermediate annealing is performed in the process of the cold rolling. The preparation method shortens the production cycle, and makes the dispersed phase stably precipitate, improves the processability of rolling and the uniformity of the final plate structure.

This invention relates to a hot-rolled wire rod for 2300MPa grade stranded wire and its manufacturing method. The method involves rolling high-Si, high-carbon components containing trace amounts of Nb into wire rods, followed by online molten salt isothermal toughening treatment. This process involves a pre-treatment molten salt stage followed by rapid cooling, transitioning the wire rod from an austenitic state to a sorbite phase, forming a structure dominated by sorbite. A subsequent molten salt stage further reduces the molten salt temperature and circulation rate, promoting the continued transformation of untransformed residual austenite into sorbite, followed by isothermal tempering and partial melting of sorbite lamellars. Finally, the wire rod undergoes slow cooling on a roller conveyor, resulting in a hot-rolled wire rod with a microstructure comprising tempered sorbite, ferrite, and melted sorbite. This achieves a tensile strength of 1530~1580MPa, a reduction of area of ​​35%~40%, and a mechanical property difference of ≤48MPa between different coils. This method balances material cost and production efficiency, eliminating the need for offline heat treatment and promoting efficient and stable production of ultra-high strength stranded wire.

This invention relates to the field of alloy cold heading steel production technology, and discloses a pearlitic phase transformation process for alloy cold heading steel that reduces or eliminates annealing. The process includes S1 precise composition design, S2 converter smelting stage, S3 LF refining stage, S4 vacuum treatment stage, S5 continuous casting stage, S6 rolling stage, S7 core controlled cooling stage for pearlitic phase transformation, S8 heat preservation and channel strengthening stage, and S9 process monitoring and closed-loop adjustment. This process achieves sufficient pearlitic phase transformation and significant suppression of harmful phases: by precisely controlling the cooling rate at 0.25-1.0℃ / s in the core controlled cooling stage, combined with heat preservation synergy within the 620-746℃ pearlitic phase transformation range, the pearlitic content of the steel is stably maintained at ≥85%, the bainite content ≤5%, and the martensite content ≤2%, completely solving the problem of excessive hardness caused by excessive harmful phases in traditional processes, and providing core microstructure protection for reducing or eliminating annealing.

The application discloses a kind of high-strength plastic β titanium alloy strip and whole-process preparation method, the β titanium alloy strip is composed of the following mass percentage components: Cr 7.7%~8.3%, Mo 4.9%~5.5%, V 4.9%~5.5%, Al 2.7%~3.3%, Fe≤0.20%, C≤0.03%, N≤0.02%, H≤0.010%, O≤0.10%, and the rest is Ti;The preparation method comprises: one, forging;Two, hot rolling;Three, cold rolling;Four, heat treatment.The β titanium alloy strip and whole-process preparation method of the application are overall planning from component design to final heat treatment whole-process procedure, improve production efficiency, shorten preparation time, and the β titanium alloy strip solid solution state microstructure is equiaxed β fine grain structure, strength-plasticity matching is high, horizontal longitudinal organization performance is uniform, with excellent comprehensive mechanical properties, applicable to metal processing field.

An energy-saving aluminum alloy air quenching rapid cooling system belongs to the technical field of aluminum alloy heat treatment, and comprises a flue gas waste heat recovery module for collecting waste flue gas, the flue gas waste heat recovery module provides heat for a refrigeration module 6, and the refrigeration module 6 provides cold for an air quenching module to realize air quenching of workpieces. The flue gas waste heat recovery module comprises a heat exchanger 8 connected with a waste flue gas collection pipeline, and waste flue gas provides heat for the refrigeration module 6 in the heat exchanger 8. The waste heat of the waste smoke generated in the industrial production process is fully utilized to drive the refrigerating system, dependence on traditional energy is greatly reduced, direct emission of high-temperature smoke is reduced through effective recovery and energy utilization of the waste smoke, pollution load to the environment is reduced, and clean production is achieved.

The application discloses a kind of micro-nano hard ceramic phase composite reinforced laser cladding nickel-based wear-resistant coating and its preparation method and application.The preparation method uses discharge plasma ball milling process to mix micro-nano hard ceramic and Ni-based metal powder for modification treatment, utilizes the synergistic effect of plasma activation and mechanical ball milling force of pulse discharge, effectively breaks the nano ceramic phase agglomerate, realizes the uniform dispersion distribution of nano ceramic phase in composite powder;By adopting the optimization of laser cladding process parameters, and cooperating with ultrasonic vibration auxiliary and / or pulse laser composite energy input, etc. Regulating means, prepare the nickel-based wear-resistant coating with uniform and dense structure, high hardness, excellent wear resistance and good metallurgical bonding with base material, which can meet the service requirements of mining machinery, oil drilling and production, metallurgical roller and other harsh working conditions, and has wide application prospect.

This invention relates to a hot-rolled wire rod for 2330MPa grade stranded wire and its manufacturing method. The method involves rolling high-carbon, high-silicon Cr-V wire rods into wire rods, followed by online molten salt isothermal toughening treatment. This process involves a pre-treatment molten salt stage followed by rapid cooling, transitioning the wire rod from an austenitic state to a sorbite phase, forming a predominantly sorbite microstructure. A subsequent molten salt stage further increases the molten salt temperature and reduces the molten salt circulation rate, promoting the continued transformation of untransformed residual austenite into sorbite and isothermal tempering, while also promoting partial melting of sorbite lamellars. Finally, the wire rod undergoes slow cooling on a roller conveyor, resulting in a hot-rolled wire rod with a microstructure consisting of tempered sorbite, ferrite, and melted sorbite. This method controls material costs, achieving a tensile strength of 1558~1608MPa and a reduction of area of ​​34%~39%, while balancing production efficiency and energy consumption. It eliminates the need for offline heat treatment, enabling efficient and stable production of ultra-high strength stranded wire.

The invention discloses a manufacturing method of a 6061T6 aluminum alloy rotating shaft die forging, and particularly relates to the technical field of aluminum alloy rotating shaft die forging manufacturing, which comprises the following steps: firstly heating a blank to a first temperature for heat preservation, then heating to a second temperature for heat preservation, and simultaneously heating a die for heat preservation; upsetting, drawing, squaring, chamfering, rolling and pre-forming the homogenized blank, monitoring the temperature of the blank in real time in the process, and carrying out remelting heat preservation control; and the blank obtained after blank making is transferred into a preheating die, closed die forging is conducted at the sectional strain rate under the isothermal condition, and the final forging temperature is controlled. Through cooperation of multiple processes, grain refinement and structure homogenization are achieved, the strength, plasticity and fatigue life of the forged piece are remarkably improved, meanwhile, the material utilization rate and the process stability are greatly improved, and the method is suitable for batch manufacturing of high-performance aluminum alloy rotating shafts in the fields of aerospace, automobiles and the like.

The application relates to the technical field of Ti2AlNb alloy processing, in particular to a Ti2AlNb alloy rod and a preparation method and application thereof. The preparation method of the Ti2AlNb alloy rod comprises the following steps: performing upsetting and drawing cycles on Ti2AlNb alloy ingots at 1050-1170 DEG C, 1010-1040 DEG C and 920-950 DEG C respectively; the number of the upsetting and drawing cycles at each temperature range is at least 3 times; and the deformation amount in the upsetting and drawing cycles is 25%-60%. The preparation method reduces the temperature points of rod forging, the upsetting and drawing forging needs 3 times of furnace loading, through the mode of multiple times of furnace re-melting of the same temperature hot material, the forging process is effectively shortened under the condition of guaranteeing that the quality of the rod is not reduced, the rod yield is increased to more than 75%, and meanwhile, the flaw detection level is obviously improved, the flaw detection level of the Ti2AlNb alloy rod with a diameter of 400 mm is increased from Phi 3.2 mm-6dB to Phi 2.0 mm-6dB.

This invention discloses a superconducting melting device that uses a permanent magnet hollow motor to drive a low-temperature superconducting coil, belonging to the technical field of metal melting equipment. It includes a support base with a rotating connecting seat fixedly connected to its top. Through the linkage between the hollow motor and the low-temperature superconducting coil, when the hollow motor drives the hollow motor rotor to rotate, the rotor drives the low-temperature superconducting coil to rotate synchronously. The low-temperature superconducting coil directly generates a dynamic rotating magnetic field, which in turn forms a uniform rotating magnetic field inside the melting crucible. This rotating magnetic field directly acts on the stationary metal ingot, causing it to generate induced eddy currents and self-heat, melting it. Through the synergistic effect of the hollow motor and the low-temperature superconducting coil, the metal ingot can complete the transformation from solid to liquid in a completely non-contact state, avoiding the impurity introduction problem caused by direct contact between electrodes, crucibles, and other components and the molten metal in traditional melting methods. This achieves clean melting of highly active, high-purity metals.

The steel for the gas cylinder pipe comprises the following components in percentage by weight: 0.30 to 0.37 percent of C, 0.15 to 0.35 percent of Si, 0.60 to 0.90 percent of Mn, not more than 0.015 percent of P, not more than 0.008 percent of S, not more than 0.02 percent of P + S, not more than 0.15 percent of Cu, 0.1 to 0.3 percent of Ni, 0.9 to 1.2 percent of Cr, 0.1 to 0.3 percent of Mo, not more than 0.02 percent of Nb, not more than 0.05 percent of V, 0.01 to 0.025 percent of Ti, 0.01 to 0.04 percent of Alt, 0.001 to 0.002 percent of B, not more than 0.0025 percent of O, 0.001 to 0.006 percent of N, not more than 0.0002 percent of H, 0.001 to 0.004 percent of Ca and the balance of Fe and inevitable impurities. The ratio of (Mo + Cr + 5C) / 0.33 Ni is equal to 30-70; alt: N > = 2; [B] * [N] < = 1 * 10-5.

The invention belongs to the technical field of copper alloy materials, and relates to a preparation method of a high-strength corrosion-resistant rare earth copper-iron alloy. According to the method, 10%-20% by mass of iron, 0.2%-1.0% by mass of rare earth copper alloy and the balance copper are designed and smelted into a cast ingot in a vacuum high-frequency induction furnace protected by argon, a thick bar is obtained through homogenization treatment at the temperature of 900-1000 DEG C and hot forging at the temperature of 900-950 DEG C, and then a rare earth copper-iron alloy strip with the thickness of about 0.1 mm is prepared through multi-pass rolling; the rare earth elements are added in the form of rare earth copper intermediate alloy coated with copper powder, so that the burning loss can be reduced, and the component uniformity can be improved. Microstructure observation and performance test show that the rare earth addition can significantly refine the iron phase and improve the distribution of the iron phase, so that the tensile strength and conductivity of the alloy are improved, and the salt spray corrosion rate is significantly reduced under the appropriate rare earth content; the rare earth copper-iron alloy prepared by the method has high strength and high corrosion resistance, and is suitable for manufacturing structural parts and functional parts in a harsh corrosive environment.

The present application relates to the technical field of precision forming of high-temperature alloy, and particularly relates to a preparation method of an engine piston ring, which comprises the following steps: reserving a machining allowance according to the size of the finished engine piston ring, calculating the diameter of the round wire through a formula d=(w+1.4h) / k, and preparing the round wire in a solid solution state; after a plurality of passes of controlled cold rolling, low-speed drawing with a flat wire drawing die with a partition structure, and double-plane wheel straightening, the single-layer rectangular piston ring blank is obtained through room-temperature winding and slitting; the evolution of the precipitated phase is precisely controlled through two-stage gradient aging heat treatment, and finally the finished engine piston ring is obtained through mechanical polishing and passivation treatment. The present application can significantly improve the size precision and yield of the piston ring, effectively improve the high-temperature creep resistance and elastic stability, and is suitable for the high-temperature service requirement of high-end power equipment due to the controllable process and easy scale production.

The application discloses a medium-carbon martensitic stainless steel with refined structure and a manufacturing method thereof. The steel has a more uniform structure and better corrosion resistance. The chromium-nickel equivalent ratio of the material is less than or equal to 1.50, the residual austenite phase is greater than or equal to 3%, the hardness after dispersoid carbide precipitation is greater than or equal to 52.5HRC, the hardness difference of the same plate is less than or equal to 1.0HRC, and the pitting point is greater than or equal to 105mV, which is 100% higher than that of 4Cr13. The material can be used in the fields of compressor valve plates and medical devices.

The application discloses a grain boundary adjustment preparation method of high-corrosion-resistance white copper alloy pipe. The method comprises the following steps: (1) pipe blank pretreatment: selecting a hot extrusion processing white copper alloy pipe blank as a base material, and pretreating the pipe blank to remove surface oil stains, oxide scales and surface defects; (2) deformation heat treatment: performing multi-pass "small deformation cold working-low temperature annealing" cycle processing on the pretreated pipe blank, wherein the single-pass cross section deformation amount is 5-20%, and after completing one pass of small deformation cold working, one annealing heat treatment is immediately performed, the annealing temperature is 700-750 DEG C, and the holding time is 80-120 min; (3) finishing and sizing treatment: after completing the whole deformation-annealing cycle process, performing finishing and sizing treatment on the pipe to obtain a finished white copper alloy pipe. Through the multi-pass small deformation-low temperature annealing cycle process, the grain boundary structure is gradually reconstructed, the proportion of special heavy site array grain boundaries in the total grain boundary length is greatly improved, and the corrosion resistance of the white copper pipe is further enhanced.

The application discloses a preparation method of a gadolinium-containing nickel-based alloy component. The gadolinium-containing nickel-based alloy pre-alloy powder is prepared into the gadolinium-containing nickel-based alloy component by using a hot isostatic pressing process with a temperature of 1080-1160 DEG C and a pressure of 120-200 MPPa, so that a Ni5Gd rare earth phase is refined to micron / submicron dispersion distribution, a matrix is an equiaxed crystal organization of complete recrystallization, original particle boundaries are completely eliminated, and grain sizes are uniformly distributed at about 5.3 mu m, thereby obtaining a near-net-shape product of the gadolinium-containing nickel-based alloy component. The application further discloses a gadolinium-containing nickel-based alloy component. Compared with the prior art, the application realizes the synergistic optimization of a rare earth phase and a matrix organization in the same process: the Ni5Gd rare earth phase is inhibited from coarsening, meanwhile, the matrix is completely recrystallized and the original particle boundaries are eliminated, and a near-net-shape gadolinium-containing nickel-based high-temperature alloy component with highly uniform organization and excellent strength-plasticity matching is obtained at one time.