1439 results about "Stress relief" patented technology

A component (202) is disclosed that includes a body (206) and an additive manufactured (AM) metal mass (200) that includes a first section (292) and a stress relief section (294). The stress relief section (294) includes a porous region (300) having a porosity in which an open spatial volume accounts for 2% to 50% of the total volume of the stress relief section (294). The stress relief section (294) has a smaller at least one of thermal conductivity, tensile strength, ductility, and fatigue strength than the first section (292). A braze material (310) couples the AM metal specimen block (200) to a specimen block opening (204) in the body (206). The stress relief section (294) creates a low stress zone in the metal specimen block (200), which can be located near or adjacent to a high stress zone. The stress relief section (294) reduces residual stress in the metal sample block (200), which reduces related challenges to couple the metal sample block (200) to the body (206) of the component (202), particularly in the case of the use of superalloy materials.

The invention relates to the technical field of steel belt shearing machining, in particular to a steel belt machining device and system. Comprising a steel belt conveying unit, a steel belt machining unit and a stress relief unit which are sequentially arranged. The steel belt conveying unit is used for conveying an unfolded steel coil to the steel belt machining unit, the steel belt machining unit is used for slitting the unfolded steel coil into steel belts, and the stress relief unit is used for releasing the stress of the steel belts; the technical problem of how to adjust the cutting width of the shearing roller is solved.

The invention relates to a 1200MPa-grade high-strength tool steel wire rod and a manufacturing method thereof, after V-containing chemical components are designed, rolled and spun into a wire rod, the wire rod is subjected to online molten salt isothermal quenching treatment, and the wire rod is controlled to enter a bainite phase region from a high-temperature austenite state at a cooling speed greater than or equal to 32 DEG C / s; the steel wire rod with a microscopic structure comprising tempered bainite and ferrite is prepared through isothermal tempering, toughening and destressing treatment, carbide precipitation control and roller way cover opening and slow cooling, so that generation of deteriorated structures such as martensite can be avoided, the structure state can be effectively adjusted, strong plasticity matching of the steel wire rod is achieved, and the service life of the steel wire rod is prolonged. And the tensile strength is 1120-110MPa, the percentage reduction of area is 63-67%, and the steel is suitable for the application fields of manufacturing 1200MPa-grade high-strength tool steel and the like, and is favorable for being directly processed into tool parts after being subjected to cold processing molding.

The invention relates to a heat treatment method for additive manufacturing of a nickel-based superalloy, and relates to the technical field of additive manufacturing. The heat treatment method comprises the following steps that the additive manufacturing nickel-based superalloy is placed at the first temperature, and first-step stress relief annealing treatment is carried out; and then the temperature is increased to a second temperature for second-step stress relief annealing treatment, and after cooling, the additive manufacturing nickel-based high-temperature alloy subjected to stress relief annealing treatment is obtained. The first temperature is 850-890 DEG C, and the second temperature is 900-950 DEG C; carrying out solution treatment on the additive manufacturing nickel-based superalloy subjected to the stress relief annealing treatment to obtain the additive manufacturing nickel-based superalloy subjected to the solution treatment; and aging treatment is conducted on the additive manufacturing nickel-based superalloy obtained after solution treatment, and the additive manufacturing nickel-based superalloy obtained after heat treatment is obtained. The method is mainly used for improving the volume fraction of the gamma'phase of the additive manufacturing nickel-based superalloy, obtaining the gamma 'phase with high cubic degree and proper size, and eliminating cracking and recrystallization caused by residual stress.

The invention relates to a 1100MPa-grade high-strength tool steel wire rod and a manufacturing method thereof, the wire rod adopts a middle-carbon Nb-V-containing chemical component design, after a steel billet is rolled and spun into the wire rod according to the spinning temperature of more than or equal to 860 DEG C, online molten salt semi-quenching isothermal treatment is performed, the wire rod is controlled to be subjected to front-section molten salt treatment, and then the steel wire rod is subjected to hot rolling and hot rolling to obtain the 1100MPa-grade high-strength tool steel wire rod. According to the method, the steel wire rod enters a bainite phase region from a high-temperature austenite state at the cooling speed of more than or equal to 30 DEG C / s to form a structure taking quenched bainite as a main component, and then is subjected to rear-section molten salt heating isothermal tempering and toughening destressing treatment, and finally is subjected to roller way slow cooling to prepare the steel wire rod with a microscopic structure comprising tempered bainite and ferrite, so that the material cost can be reduced, and the production efficiency is improved. The method has the advantages that martensite brittle structures are effectively avoided, the structure state of the hot-rolled wire rod is controlled, the plasticity and cold working performance of the wire rod are improved, the tensile strength of the product can reach 980-1030 MPa, the percentage reduction of area is 61%-66%, and the product can be directly machined into tool parts after cold forming.

Provided is a method for judging geology of a time-delayed extremely intense rockburst as to deep tunnel engineering. Information about geological structures is recorded according to methods such as geological mapping and advanced geological prediction of the tunnel face. Geometric characteristics of burst craters formed during the rockburst are recorded by utilizing advanced geological drilling and profile scanning technologies in a rockburst-damaged zone. 3D geostress in the rockburst-damaged zone is measured by using a stress relief method or a hydraulic fracturing method to determine the orientation of the maximum principal stress. A 3D numerical calculation model is established based on initial geostress testing results and physical and mechanical parameters of rock and structural discontinuities obtained through on-site geological investigations. By conducting excavation simulations under different combinations of structural discontinuities and performing numerical calculation, the risk of time-delayed extremely intense rockburst disasters at current locations after tunnel excavation is judged.

The invention discloses a multilayer three-dimensional stacked circuit board and a preparation method thereof, and the method specifically comprises the steps: obtaining a substrate with a single conductive surface, and carrying out the spraying of a stress buffer layer on the conductive surface of the substrate; covering a layer of insulating material on the stress buffer layer, and forming a pattern insulating layer through photoetching; performing pulse electroplating processing on the exposed pattern of the pattern insulating layer to obtain a first circuit board; silk-screening a flexible connection layer on the pattern bonding pad layer of the first circuit board, and carrying out three-dimensional stacking processing on the flexible connection layer to obtain a second circuit board; and assembling a circuit protection layer on the second circuit board, and processing a stress release groove between the second circuit board and the circuit protection layer to obtain the multi-layer three-dimensional stacked circuit board. Through the design of the stress buffer layer and the stress release groove, interlayer stress can be reduced, circuit board breakage or cracking caused by overlarge interlayer stress is avoided, and the technical problem that large interlayer stress is generated in the circuit board preparation process in the prior art is solved.

The invention discloses an ultra-wideband carbon / boron doped high-entropy alloy wave-absorbing material which is prepared by adjusting Fe and Ni elements, adding Si and Al elements and doping a small amount of C or B. The specific component of the wave-absorbing material is (FeaCobSicAldNie) 100-xMx. In addition, the invention also discloses a preparation method of the wave-absorbing material, and the preparation method comprises the following steps: 1, high-entropy alloy smelting; 2, preparing high-entropy alloy spherical powder; 3, carrying out flaky treatment; and 4, stress relief annealing. On the basis of FeCoNi medium-entropy alloy, the content of the Fe element with low cost is increased, the content of the Ni element with high cost is reduced, the Si element and the Al element are added at the same time, then a small amount of non-metal C and B elements are doped to serve as interstitial atoms, lattice distortion is increased, the wave-absorbing performance and corrosion resistance are improved, and the ultra-wideband carbon / boron doped high-entropy alloy wave-absorbing material is obtained.

The invention discloses hot-rolled high-strength steel and a method for controlling and optimizing the shape of the hot-rolled high-strength steel, and belongs to the field of production methods of the hot-rolled high-strength steel. The tensile strength level of the hot-rolled high-strength steel is 500-700 MPa, and the thickness of the hot-rolled high-strength steel is 2.0- According to the plate shape control and optimization method, a steel coil is obtained through the production technological processes of plate blank heating, rough rolling, finish rolling, laminar cooling and coiling, the steel coil is fed into a cover type annealing furnace to be subjected to stress relief annealing treatment, hot-rolled high-strength steel with the good plate shape is obtained, according to the annealing technology, the temperature is increased to 450-550 DEG C from the room temperature, and the heating time is 3.5-4.5 h; the annealing temperature ranges from 450 DEG C to 550 DEG C, and the annealing time ranges from 19.5 h to 20.5 h; and stopping fire, performing furnace cooling in a bell-type furnace, and when the temperature is reduced to 180-220 DEG C, taking out and performing air cooling to room temperature. The method can effectively solve the problem that the plate shape is poor after the internal stress is released after the subsequent steel plate is uncoiled or coiled because the internal stress of the existing hot-rolled steel plate is non-uniform.

The invention belongs to the technical field of annealing equipment, and particularly relates to online stress relief annealing equipment and method for copper alloy stamping parts. The online stress relief annealing equipment comprises an annealing furnace, a hot air circulating fan fixed to the surface of the annealing furnace and a conveyor placed at the feeding end of the annealing furnace; the device is provided with the feeding assembly, copper alloy stamping parts can be rapidly and efficiently transferred and clamped, feeding operation can be completed under the condition that workers do not need to make direct contact with high-temperature parts, direct contact between the workers and the high-temperature copper alloy stamping parts is completely avoided, the skin scalding accident is fundamentally eradicated, and the working efficiency is improved. According to the feeding device, feeding operation can be conducted continuously, so that the production efficiency of the whole stress relief annealing process is improved, the continuity of the production process is ensured, feeding errors caused by fatigue, inattention and the like of workers are eliminated, seamless connection with stress relief annealing equipment can be achieved, and the whole machining process is smoother.

The invention relates to the technical field of turning devices, and discloses a sheet metal turning device and a stainless steel sheet metal turning method.The sheet metal turning device comprises a lathe bed, a main shaft installed in the lathe bed, a guide rail, a feeding base and a tool rest, and is characterized in that a vibration disc, a driving assembly, a clamp and an overturning assembly are further installed in the lathe bed; and the clamp is movably mounted on the vibration disc. The driving assembly, the vibration disc, the clamp and the overturning assembly are arranged on the lathe bed, when a stainless steel metal plate workpiece is machined, rough machining is conducted firstly, then the workpiece on the main shaft is transferred and fixed to the vibration disc through the driving assembly, the clamp and the overturning assembly, and then the stress of the workpiece is eliminated through vibration; and finally, the workpiece is transferred again and fixed to the main shaft for finish machining, the turning machining of the stainless steel sheet metal part can be adapted through the rough machining, stress removing and finish machining modes, the probability of workpiece deformation is reduced, and the machining quality of products can be improved.

Disclosed herein are microelectronic assemblies, as well as related apparatuses and methods. In some embodiments, a microelectronic assembly may include a first die having a first surface, an opposing second surface, and a first footprint; a second die electrically coupled to the second surface of the first die and having a second footprint, wherein the second footprint is smaller than the first footprint; and a mold material on the second surface of the first die and surrounding the second die, the mold material including a trench.

An additive manufacturing titanium alloy fatigue performance improving method comprises the following steps that S100, additive manufacturing process parameters such as laser power, scanning speed, scanning spacing and powder laying thickness are optimized in the mode that a large number of experiments and numerical simulation are combined, and the minimum porosity and the optimal fusion effect are obtained; s200, the titanium alloy part obtained after additive manufacturing is subjected to stress relief annealing treatment under the vacuum or inert gas protection atmosphere; s300, shot blasting treatment is conducted on the part, initiation and expansion of surface cracks are effectively restrained, meanwhile, surface grains are refined, and the surface hardness and strength are improved; and S400, a ceramic coating or a metal coating is prepared on the surface of the treated titanium alloy part. According to the method for improving the fatigue performance of the additive manufacturing titanium alloy, the fatigue performance of the additive manufacturing titanium alloy is remarkably improved through comprehensive effects of multiple aspects such as internal structure optimization, residual stress elimination, surface strengthening and corrosion protection.

The invention discloses an alkaline cyanide-free cadmium plating process for an ultrahigh-strength steel part. The alkaline cyanide-free cadmium plating process comprises the steps of oil removal, stress elimination, electrolytic oil removal, flowing water washing, weak corrosion, flowing cold water washing, copper pre-plating, flowing cold water washing, alkaline cyanide-free cadmium plating, flowing water washing, hydrogen removal, aftertreatment, drying and inspection. In order to avoid the situation that the metal surface of the workpiece is passivated in a plating tank, the pretreatment process is adopted, a cyanide-free copper electroplating layer is pre-plated on the surface of the workpiece, the surface of the part is adjusted, the surface activity is improved, and then the binding force of a base body and the plated cadmium is improved; according to the method, a stress eliminating process and a long-time hydrogen removing process after plating are adopted before plating, so that the hydrogen embrittlement risk is reduced, the process steps are simple, and the implementation is high.

The invention discloses a precise connecting rod bushing forming process, which relates to the field of multi-pass spinning forming and comprises the steps of S1, blank customization, S2, die optimization, S3, blank clamping and positioning, S4, spinning roller track planning, S5, size measurement and parameter adjustment, S6, multi-pass successive approximation, S7, parameter optimization and S8, quality detection. And S9, stress relief is conducted, specifically, the connecting rod bushing obtained after spinning is put into a box-type resistance furnace to be subjected to low-temperature tempering treatment, the tempering temperature is set to range from 200 DEG C to 250 DEG C, the heat preservation time ranges from 2 hours to 3 hours, and then the connecting rod bushing is cooled to the room temperature along with the furnace. Through spinning roller track planning, size measurement, parameter adjustment and multi-pass successive approximation, it is ensured that the size precision and stability of the formed precise connecting rod bushing are improved, through stress relief, the mechanical property of the formed precise connecting rod bushing is excellent, meanwhile, a mold is optimized, stress concentration is reduced, and the production efficiency is improved. Through track planning, size measurement and parameter adjustment of the spinning roller, the production process is efficient and controllable.

The invention discloses an iron-based nanocrystalline soft magnetic alloy and a preparation method thereof. A magnetically soft alloy strip is prepared through smelting and a single-roller melt-spinning method, stress relief annealing is carried out on the magnetically soft alloy strip through assistance of a magnetic field, and then crystallization annealing treatment is carried out. Different from a traditional method for regulating and controlling the magnetic performance of the alloy through precipitation of a large number of nanocrystals, the method only induces precipitation of a very small number of nanocrystals, and high saturation flux density and low coercive force can be obtained while the toughness of the strip is ensured; the iron-based nanocrystalline soft magnetic alloy with high saturation flux density and low coercive force can be prepared by taking Fe as a main element, Co element with the atomic fraction lower than 8%, Cu element with the atomic fraction lower than 1% and at least one of oxygen, sulfur, phosphorus, carbon, silicon, boron and the like as other trace elements.

The invention discloses easy-open lid punch forming equipment, which relates to the technical field of punching equipment, and comprises a machine body, a punch forming part and a conveying part, the unwinding component is arranged at the front end of the machine body and is used for releasing an aluminum coiled material; the blanking part is mounted at the front part of the machine body and is used for cutting the released aluminum coiled material into aluminum sheets with the same size; the slicing component is mounted at the rear part of the machine body and is used for prefabricating the sheets into wafers with the same shape; and the stress relieving part is mounted in the middle of the machine body and used for releasing the stress of the aluminum coiled material. According to the invention, the blanking component is arranged to blank the released aluminum coil into the aluminum sheets with the same size, and the die for blanking the aluminum coil is arranged to be of a structure with sawteeth on one side, so that the aluminum sheets with the sawtoothed edges can be blanked, and the protruding parts of the outermost edges of the front and rear sides of the sheet with the shape can be cut into complete round sheets; therefore, the areas of non-stamping parts on the front side and the rear side of each aluminum material are reduced, and the waste amount of the aluminum materials is reduced.

The invention provides a high-strength pure titanium rod wire and a preparation method thereof, and relates to the technical field of biomedical metal materials, and the preparation method comprises the following steps: preparing materials according to industrial pure titanium components, carrying out vacuum consumable smelting to obtain a titanium ingot blank, and carrying out cogging forging and continuous rolling on the titanium ingot blank to obtain a coiled rod blank; the coiled bar blank is subjected to hot drawing to obtain a pure titanium bar, and the pure titanium bar subjected to hot drawing is sequentially subjected to scaling treatment, heat treatment, cold drawing, sliding block straightening, stress relief annealing and centerless grinding to obtain a finished product of the high-strength pure titanium bar wire. According to the method, the surface reduction rate is controlled through cold drawing, the performance of the rod wire is adjusted through a reasonable heat treatment system, metastable structures in the alloy are obviously deformed and close to each other through cold drawing, the deformation amount of cold drawing is continuously increased, grain boundaries and dendritic grain boundaries are close to each other, the interface distance is gradually reduced, grains and the metastable structures are refined, and the yield of the rod wire is increased. Due to the increase of dislocation density and grain refinement, the yield strength and tensile strength of the cold-drawn pure titanium rod wire are improved.

The invention relates to the technical field of destressing heat treatment of shaft parts, in particular to a local destressing annealing device. The invention provides a local stress relief annealing device which comprises a heat treatment cylinder, an electric control cabinet and a placement bracket, one axial end of the heat treatment cylinder is open, a plurality of temperature sensors are arranged in the heat treatment cylinder at intervals, the heat treatment cylinder and the plurality of temperature sensors are in signal connection with the electric control cabinet, and the heat treatment cylinder is transversely arranged on the placement bracket. The device is simple to operate, can avoid dependence on heat treatment furnace equipment, and also avoids bending deformation of the shaft parts when the shaft parts are transversely placed and heated under the participation of the external roller carrier.

The invention discloses a preparation method of a graphite composite bipolar plate, which comprises the processes of raw material homogenization, preheating treatment, hot press molding, demolding, stress relief and cutting and trimming, the raw material homogenization and stress relief processes can significantly improve the yield and product quality, and the problems of low yield, poor batch stability and the like in the prior art are solved; meanwhile, conductive fillers such as graphene, carbon fibers, carbon black, carbon nanotubes and metal fibers are introduced, so that a bridging effect among graphite particles is achieved, a conductive path is broken through, contact resistance is reduced, the overall conductivity of the bipolar plate is improved, the mechanical property of the material can be improved, and the service life of the bipolar plate is prolonged. Particularly, the bending strength is obviously improved; in addition, the method is simple in process, flexible to adjust, low in special equipment requirement, low in equipment investment and suitable for popularization.

The invention discloses a processing method of a high-toughness stainless steel / carbon steel composite plate, which comprises the following steps: compounding a high-strength carbon steel plate and a stainless steel plate through a rolling compounding process under the action of laser-assisted heating; then, the stainless steel / carbon steel composite sheet is subjected to temperature control type online periodic laser surface annealing treatment, so that a corrosion-resistant structure with a non-uniform structure in which coarse grains (a soft region) and fine grains (a hard region) are alternately arranged can be obtained on the stainless steel surface layer, and the corrosion resistance of the composite plate is improved; and meanwhile, the stress relief effect induced by laser surface annealing treatment is combined with high-temperature tempering softening of a martensitic structure on the carbon steel side part at the interface, and a heterogeneous structure induced by laser surface annealing treatment can synchronously improve the obdurability of the stainless steel / carbon steel composite plate.

A closure member is configured for use in a valve. These configurations may have a coating or conformal layer that may cover most, if not all, of the underlying material. This layer may include pre-propagated cracks that form due to thermal cycling prior to use in service. These pre-propagated cracks act as stress relief to accommodate for possible thermal stress that occurs due to different rates of thermal expansion between the underlying closure member and the coating. In one implementation, the layer may include a crack profile, which is engineered to direct formation of the pre-propagated cracks as well as to arrest crack development to a certain depth to maintain at least some integral layer of material over the underlying plug 118. This feature can extend service life of the plug, particularly in highly-erosive process fluids, like particle-entrained fluids commonly found in hydrocracking or refining operations.

The invention belongs to the field of heat treatment of high-temperature alloy parts, and particularly relates to a heat treatment method. An existing conventional destressing heat treatment process of charging at the furnace temperature below 400 DEG C, heating to the temperature of 540-560 DEG C at any speed / heat preservation for 2-4 h / air cooling is adjusted into a gradient heat treatment process of charging at the room temperature of a heating furnace, heating to the first gradient of 600-620 DEG C along with the furnace at the speed of (50 + / -10) DEG C / h and heat preservation for 2-4 h, furnace cooling to the second gradient of 500-550 DEG C at the speed of (50 + / -10) DEG C / h and heat preservation for 2-4 h. According to the method, after the aging-state GH4169 alloy part is subjected to heat treatment, the residual stress level of the aging-state GH4169 alloy part is reduced by more than 50% compared with that of a conventional stress relief annealing process, so that the deformation tendency and degree of the part in the subsequent machining and using process are further reduced, and the manufacturing qualification rate of the part is increased.

The invention discloses a preparation method of a high-strength 5000 series aluminum alloy sheet for anodic oxidation. An aluminum ingot, an aluminum intermediate alloy ingot and electrolytic aluminum water are used as raw materials, and the high-strength 5000 series aluminum alloy sheet for anodic oxidation is prepared through the steps of smelting, casting, homogenization treatment, hot rolling, cogging cold rolling, intermediate annealing, finished product low-temperature cold rolling, stress relief annealing, cleaning, straightening and trimming and finished product shaft splitting. The tensile strength of the aluminum alloy material with the thickness of 0.5-2.0 mm is larger than or equal to 280 MPa, the yield is larger than or equal to 240 MPa, and the ductility is larger than or equal to 8%. The grain size of any position of the surface of the obtained final product is smaller than or equal to 30 microns, the grain aspect ratio is 1.0-1.6%, it can be guaranteed that no material lines and different color lines appear on a 150 # zircon sand blasting anode, and the requirements for high-strength punch forming and anodic oxidation of the product are met.

The utility model discloses an assembly line carrier stress relieving device which comprises a stress rod hinged to the front end of a walking frame in a carrier and a tail rod arranged at the rear end of the carrier, the lower end of the stress rod obliquely stretches out towards the rear lower portion of the carrier, and the lower end of the stress rod serves as a stress part for receiving power for pushing the carrier to advance. The tail rod extends towards the rear side of the walking frame, the tail rod on the front side carrier is used for acting on the stress rod on the rear side carrier, so that the lower end of the stress rod swings between the stress position and the disengaging position, and the disengaging position is higher than the stress position. The upper ends of the stress rods obliquely stretch out towards the upper front portion of the walking frame, a limiting structure is formed at the front end of the frame and used for limiting the stress rods so that the lower ends of the stress rods can be located at stress positions, and the tail rod is used for acting on the upper ends of the stress rods on the rear side carrier. The lower end of the stress rod swings between a stress position and a release position; the width of the tail rod is larger than that of the upper end of the stress rod.

The invention relates to the technical field of railway ballastless track bed construction, in particular to a guard rail type ballastless track bed construction method. Comprising the steps of construction preparation, survey lofting and foundation mark survey setting, beam surface chiseling cleaning, sleeve connecting steel bar installation, base steel bar binding, bridge expansion joint embedded part installation, base and groove formwork installation, base concrete pouring and maintenance, isolation layer geotechnical cloth and elastic base plate laying, groove insulation steel bar framework installation and ballast bed bottom layer steel bar binding. The method comprises the following steps of: distributing double-block type sleepers, transporting tool rails, assembling double-block type track panels, roughly adjusting track lifting of the double-block type track panels, binding steel bars on the upper layer of a track bed, distributing guard wheel sleepers, assembling guard wheel track panels, roughly adjusting the sizes of the guard wheel track panels, mounting and adjusting track bed templates, finely adjusting the double-block type track panels for the first time, adjusting the sizes of the guard wheel track panels, and finely adjusting the double-block type track panels for the second time. The method comprises the steps of guard rail row size rechecking, ballast bed concrete pouring, stress relief, concrete curing and data acquisition.

An improved glove has both anatomically correlating stress relief zones and / or reinforced zones to add support in areas opposite the stress relief zones to keep bunching or slipping of the glove from interfering with the bending of the user's joints. The glove may have corrugated relief zones over some or all of the joints and knuckles of the hand, wherein the relief zones are formed of peaks and valleys. A relief zone can also be provided over the webbing between the thumb and the palm. The vertical or longitudinal relief zones provide for improved glove quality while keeping manufacturing difficulty and costs at a minimum.

The invention relates to the technical field of material surface engineering, and discloses a plastic surface treatment process to solve the problems that in the prior art, a plastic surface coating is poor in adhesive force and single in function, and a traditional treatment method is not environmentally friendly. The process sequentially comprises the following steps: pre-treating a base material, and obtaining a clean and stress-free base material through ultrasonic cleaning and thermodynamic stress elimination; performing low-temperature plasma surface activation, performing physical bombardment and chemical modification on the plastic surface by utilizing plasma of specific process gas in a vacuum environment, introducing a large number of active functional groups, and remarkably improving the surface energy; and preparing and applying the functional nano coating, namely forming firm covalent bonds by using the coupling agent in a coating solution containing functional nano particles and a coupling agent and the anchor points, so that the chemical coupling of the functional coating and the plastic substrate is realized.

The invention relates to a high-performance non-quenched and tempered steel bar for a fan shaft and a manufacturing method of the high-performance non-quenched and tempered steel bar, and belongs to the field of iron-based alloys. The steel comprises the following chemical components in percentage by weight: 0.37 to 0.43 percent of C, 0.30 to 0.60 percent of Si, 1.20 to 1.70 percent of Mn, less than or equal to 0.025 percent of P, 0.030 to 0.070 percent of S, less than or equal to 0.50 percent of Cr, 0.10 to 0.30 percent of Ni, less than or equal to 0.30 percent of Mo, less than or equal to 0.30 percent of Cu, 0.010 to 0.030 percent of Al, 0.005 to 0.025 percent of Ti, 0.05 to 0.15 percent of V, 0.0100 to 0.0200 percent of N, less than or equal to 0.0002 percent of H, less than or equal to 0.0015 percent of O and the balance of Fe and inevitable impurity elements. The manufacturing process comprises the steps of converter / electric furnace smelting, LF furnace refining, RH / VD furnace vacuum degassing, continuous casting, casting blank reheating, cogging rolling, flame cleaning, intermediate blank finishing, intermediate blank heating, bar rolling, cooling and stress relief tempering. The total cross-section structure of the bar is a ferrite and pearlite structure. The bending degree per meter is smaller than or equal to 0.5 mm, the surface defect depth is smaller than or equal to 0.10 mm, and the internal quality meets the A-level requirement of the GB / T4162 standard.

The invention relates to the technical field of aluminum alloy forging, in particular to a forging process capable of reducing reverse forging coarse grains of 6061 aluminum alloy, which comprises the following steps: acquiring a 6061 aluminum alloy ingot, homogenizing and annealing the 6061 aluminum alloy ingot at 480-520 DEG C for 12-16 hours, cooling to room temperature by water, performing ultrasonic flaw detection, performing turning surface treatment, and alternately forging and pressing in three directions, thereby obtaining the 6061 aluminum alloy. The method comprises the following steps: placing a fine-grain 6061 aluminum alloy forge piece in a graded heating furnace, completing sub-dynamic recrystallization, applying directional pressure stress of 50-80MPa to the 6061 aluminum alloy forge piece, analyzing grain boundary characteristic distribution by adopting an electron back scattering diffraction technology, and obtaining the grain boundary optimized 6061 aluminum alloy forge piece with a discontinuous coarse-grain structure through laser shock strengthening and stress relief annealing. According to the method, the problems that reverse forging coarse grains are caused by uneven strain distribution during forging and pressing, and fine grains and high-density nanoprecipitation cannot be effectively obtained and a grain boundary structure cannot be optimized due to the fact that follow-up forging, heat treatment and stress treatment parameters are difficult to accurately control can be solved.