181 results about "Impact toughness" patented technology

The application discloses a kind of thick gauge 430 ferritic stainless steel laser weld low-temperature rollability processing method, comprising: using-1~‑2mm negative defocusing+8~10kW low-power laser welding, the grain of heat-affected zone is refined;NiCr-3 welding wire is preheated to 300~400℃ and carried out hot wire laser welding, reduces cooling rate;Weld is implemented 700 DEG C / 10-12 seconds short time induction annealing, decomposes martensite and releases residual stress;Weld is inducted to ≥50 DEG C before rolling and restores plasticity;Optimize five rack continuous rolling parameter, and the reduction of first rack is reduced to 15%-20%.The application is by welding-heat treatment-rolling whole process synergic control, makes weld low-temperature cracking rate from 2.6 times / month reduce to 1 times below, and-10 DEG C impact toughness is promoted to 22J, cup convexity qualification rate reaches 95%, and annual economic benefit is greatly improved, applicable to the thickness 3.0~8.0mm 430 stainless steel cold rolling production, solves the technical problem that thick gauge 430 stainless steel weld is easy to crack under low-temperature environment.

The application discloses a coating structure of a valve rod of a nuclear power plant, a valve rod and a preparation method thereof, and the coating structure comprises a transition layer and a hydrogen-free diamond layer which are sequentially arranged from inside to outside, the microstructure of the transition layer is nanotwin, and the coating structure is uniformly covered on the surface of the valve rod. The preparation method comprises the following steps: after the valve rod is cleaned, the valve rod is subjected to plasma surface activation, the transition layer and the hydrogen-free diamond layer are sequentially deposited, and the valve rod is obtained. The coating structure of the valve rod of the nuclear power plant, the valve rod and the preparation method thereof effectively improve the hardness of the surface of the valve rod, reduce the friction loss of the valve rod, make the valve rod have good wear resistance and a reduced friction coefficient, improve the work efficiency, and further improve the service life of the valve rod, can meet the technical performance requirements of the valve rod on impact toughness, corrosion resistance and wear resistance in a high-temperature and high-pressure water environment, and effectively reduce the production cost.

The application discloses a kind of offshore wind power bearing heterogeneous material multi-field construction forming method, the contact surface of the inner ring and outer ring of offshore wind power bearing is sealed welding to obtain bearing ring blank, the bearing ring blank is hot-rolled, and bearing ring piece is prepared by synchronously applying pulse current during the hot-rolling, wherein the inner ring and outer ring are two different materials.The surface of the wind power bearing prepared by the application is copper alloy material, which has good corrosion resistance and abrasion resistance, the core is traditional alloy steel material, which has good strength and impact toughness, the heterogeneous interface also realizes mechanical combination and metallurgical combination, and finally obtains excellent comprehensive performance, which helps to realize the high-performance and low-cost manufacturing of wind power bearing heterogeneous material.

The application discloses a welding method for improving low-temperature impact toughness of thick plates in a stress relief heat treatment state, which comprises the following steps: processing a groove; symmetrically processing an X-shaped groove on a welding section of a thick steel plate to be welded, wherein the X-shaped groove comprises a central flat part and two inclined parts symmetrically arranged on both sides of the central flat part in a thickness direction; pre-welding; controlling an assembly gap of the tailor-welded thick steel plate to be zero, and adopting tungsten argon arc welding to pre-weld a welding bead on both sides of the groove root of the upper and lower surfaces of the thick steel plate; and welding; adopting submerged-arc welding to weld and fill the groove on both sides of the upper and lower surfaces of the thick steel plate containing the pre-welding bead. The welding method for improving low-temperature impact toughness of thick plates in a stress relief heat treatment state can effectively improve the low-temperature impact toughness of the weld.

The application discloses a thick plate welding method with good low-temperature impact toughness in a stress relief annealing state, which comprises the following steps: processing a groove; symmetrically processing an X-shaped groove on a welding section of a thick steel plate to be welded, the X-shaped groove comprising a central flat part and two inclined parts symmetrically arranged on both sides of the central flat part in a thickness direction; and welding; controlling an assembly gap of the tailor-welded thick steel plate to be zero, and adopting five-wire submerged arc welding to perform single-pass welding on upper and lower surfaces of the thick steel plate respectively. The welding method adopts high-efficiency five-wire submerged arc welding, and through reasonable setting of angles of welding guns and polarities of power sources, reasonable matching of welding materials and process parameter windows, cooperation of an optimized groove form and the process parameter window, and the like, low-temperature impact toughness of a weld after stress relief annealing heat treatment is avoided from greatly decreasing.

The application belongs to the technical field of heat treatment of bearing steel, and particularly discloses a heat treatment method for improving the organization stability of high-nitrogen stainless bearing steel, which comprises the following steps: firstly, high-temperature diffusion annealing is performed to reduce the segregation degree; then, forging is performed after heat preservation at 1140-1160 DEG C for 1-2 hours; and subsequently, normalizing, spheroidizing annealing, quenching, deep cooling, partitioning and tempering are sequentially performed after the forging. Through reasonable design of the heat treatment process, the problems of low impact toughness, too many residual austenite and poor stability of the high-nitrogen stainless bearing steel are effectively solved by the sequential partitioning and tempering, and the high-nitrogen martensitic stainless bearing steel with high strength and toughness and impact resistance is prepared.

This invention discloses a method for improving the low-temperature impact toughness of high-strength heat-treated steel rails, comprising the following steps: composition control, smelting and refining, rare earth modification treatment, continuous casting / billing and heating homogenization, two-stage controlled rolling forming, online heat treatment with graded cooling and residual heat recovery, slow cooling on a cooling bed and straightening finishing. This invention determines the composition window based on the common constraint range of two sets of steel chemical composition standards for rails, and through the synergistic control of purification, effective rare earth modification, two-stage controlled rolling for grain refinement, and the online graded cooling and residual heat recovery heat treatment path, it reduces the sensitivity to low-temperature crack initiation, constrains the phase transformation path, and weakens the coupling between residual stress and microstructure embrittlement. Thus, while meeting the requirements for high strength, hardness, and wear resistance, it achieves qualified and stable low-temperature impact toughness.

The present invention relates to the technical field of steel, in particular to a pressure vessel steel plate used for a low-temperature spherical tank and having good property uniformity, and a manufacturing method therefor. The chemical components of the steel plate, in percentages by weight, are as follows: C: 0.070%-0.100%, Si: 0.15%-0.40%, Mn: 1.45%-1.60%, P≤0.015%, S≤0.003%, Nb: 0.030%-0.050%, Ti: 0.015%-0.025%, V: 0.030%-0.040%, Ni: 0.20%-0.25%, Mo: 0.06%-0.11%, Cu: 0.10%-0.18%, and Alt: 0.015%-0.045%, and with the balance of being Fe and inevitable impurities. In the present invention, by means of a process including nickel-molybdenum niobium-vanadium-titanium microalloying, the smelting of a continuously cast slab, controlled rolling and controlled cooling, differential temperature rolling, and a tempering treatment, the resulting product has well-balanced strength and toughness and a flat plate shape, and the phenomena of a large difference in mechanical properties in the thickness direction and scattering in low-temperature impact toughness at the core are greatly ameliorated.

The invention discloses heat-resistant composite alloy powder which comprises the following components in percentage by mass: 8.5%-9.5% of Cr, 0.2%-0.4% of Y, 0.03%-0.25% of Zr, 0.02%-0.09% of Mn, 0.04%-0.08% of Si, 0.6%-2.5% of Mo, 0.2%-0.4% of O, 9%-19.5% of TiC and the balance of Fe and impurity elements. The heat-resistant composite alloy powder disclosed by the invention is uniform in chemical components, after an alloy ingot is prepared by adopting cold isostatic pressing, sintering, forging and heat treatment, the alloy ingot has good wear resistance and impact toughness and also has good radiation resistance, and the service life of the material under complex working conditions can be greatly prolonged.

This invention discloses a high-strength and tough PET foam sheet and its preparation method, belonging to the field of foam material technology. It comprises the following raw materials in parts by weight: 100 parts food-grade PET resin, 3-7 parts melt reinforcing agent, 3-5 parts crystallization toughening agent, 1-3 parts in-situ fiber-forming reinforcing agent, 1-5 parts compatibility dispersant, and 8-10 parts cyclopentane. The preparation method includes: S1, mixing dried food-grade PET resin with melt reinforcing agent, crystallization toughening agent, in-situ fiber-forming reinforcing agent, and compatibility dispersant to obtain a premix; S2, melting and plasticizing the premix, injecting liquid cyclopentane for blending, and then extruding to a normal pressure environment to obtain a foam sheet blank; S3, cooling and shaping the foam sheet blank, drawing, trimming, and winding to obtain a high-strength and tough PET foam sheet. The foam sheet obtained by this invention has fine and uniform pores, possessing high flexural strength, high modulus, and high impact toughness, with comprehensive performance far exceeding that of traditional PET foam materials.

The application discloses an anti-ultraviolet heat-insulating polypropylene material and a preparation method thereof, and relates to the technical field of high-performance polypropylene, which comprises the following components: 65-85 parts of polypropylene resin, 5-20 parts of a compatilizer, 3-30 parts of a filler, and 0-5.0 parts of an auxiliary agent; the filler is composed of hollow glass beads with low thermal conductivity and mica powder with sheet layer barrier capacity, and the filler is surface-modified; the anti-ultraviolet compound is chemically bonded to the surface of the filler through Zn-Ti co-deposition and PDA-mediated grafting reaction, the polarity of the filler is improved, the dispersibility of the filler in the polypropylene resin is improved, the interfacial bonding force between the polypropylene is improved, the stress concentration is reduced, the tensile strength and impact toughness of the material are improved, and the overall mechanical property is enhanced; the modified filler can effectively absorb UVB / UVA, the hydroxyl phenyl structure of the modified filler can effectively quench free radicals, and the ultraviolet shielding property of the modified filler and the polypropylene material is improved.

This invention relates to a high-strength and high-toughness forged ring with a large wall thickness of 460MPa or above, its preparation method, and its application. It belongs to the field of forging technology and solves the problems of poor impact toughness in the core of forged rings with a wall thickness ≥100mm in the prior art, and the difficulty in achieving both high strength and excellent welding performance. The method includes the following steps: S1: Billet preparation, selecting a billet with the following chemical composition by weight percentage: C 0.08-0.12%, Si 0.10-0.20%, Mn 1.00-1.20%, Ni 1.0-1.4%, Mo 0.2-0.4%, V 0.02-0.05%, S<0.001%, P<0.006%, with the remainder being Fe and unavoidable impurities; S2: Forging the forged ring, forging the billet into a forged ring of the required size, wherein the wall thickness of the forged ring is ≥100mm; S3: Post-forging pretreatment; S4: Heat treatment, sequentially quenching, two-phase quenching, and tempering of the pretreated forged ring; S5: Finishing. This method enables the preparation of high-strength, high-toughness, thick-walled forged rings for shipbuilding, offshore platforms, or engineering machinery applications.

The application discloses a kind of multi-stage synergic control methods for reducing the size of heavy rail steel A inclusion, including converter smelting, LF refining, RH refining, continuous casting and rolling steps;The RH refining step: before breaking empty, add complex nucleating agent, and the amount is 0.8-2.0 kg / t steel;The composition of the complex nucleating agent is: Zr 10%-20%, Ti 15%-25%, Mg 5%-10%, Al 10%-20%, the balance is Fe and unavoidable impurities;The continuous casting step: the primary dendrite arm spacing in the center region of continuous casting billet is controlled at 200-400 μm, and the solidification front cooling rate is controlled at 0.5-3.0 K / s.This method reduces the average size of MnS to below 2.0 μm, and the A inclusion rating is ≤1.5 level, realizes the precise control of A inclusion size and distribution, significantly reduces the A inclusion rating, and significantly improves the transverse impact toughness and fatigue performance of heavy rail steel.

The application relates to PG2 steel forged large-length-ratio thick-wall pipe material capable of bearing high temperature, high strength and high-low temperature impact and a heat treatment process. The material is PG2 steel, and the chemical components include the following according to mass percentage: C: 0.28-0.33%; Si: 0.15-0.35%; Mn: 0.75-0.95%; Cr: 1.80-2.10%; Ni: 3.00-3.50%; Mo: 1.20-1.40%; V: 0.20-0.35%; W: 0.20-0.50%; P: <=0.010%; S: <=0.005%; Cu: <=0.10%; Al: <=0.030%, and the balance is iron. Through sectional heating grain refinement and structure regulation technology, and in combination with the use of an inner hole cooling special tool installed at the bottom of a water tank, the PG2 steel forged large-length-ratio thick-wall pipe is uniformly and rapidly cooled, so that the mechanical properties and grain size of the PG2 steel forged large-length-ratio thick-wall pipe meet the design target, the material has high hardenability, the steel has normal temperature and 700 DEG C strength and low temperature impact toughness after quenching and tempering, and the requirements of high strength and high toughness are met.

This invention discloses a ship plate steel with high plasticity, excellent impact toughness, and excellent weldability, and its production method. The composition of the ship plate steel includes C, Si, Mn, Als, P, S, Re, and the balance Fe and impurities. The preparation method includes: heating the billet at a temperature of 1150–1250℃, a heating rate of 8–12 min / cm, and a furnace exit temperature in the range of 1170±30℃; rolling: the first-stage rolling temperature is ≥1050℃, the intermediate billet thickness is 3 times the thickness H of the finished steel plate, and the second-stage rolling temperature is ≤960℃. The final rolling temperature is 830±30℃; the red-hot temperature after rolling is determined according to the thickness H of the finished steel plate. When H≤16mm, the red-hot temperature after rolling is 620±40℃; when 16<H≤25mm, the red-hot temperature after rolling is 640±30℃. The maximum thickness of the finished steel plate obtained by this invention is 25mm, the yield strength ReH≥320MPa, the tensile strength Rm≥420MPa, the elongation A≥30%, the longitudinal impact energy KV2≥200J at 0℃, and the steel plate microstructure is ferrite + pearlite. It is an economical high-plasticity ship plate steel.

This application relates to the field of cargo hold processing technology, and discloses a method for supplying cylindrical ring plates and a cargo hold. The method for supplying cylindrical ring plates includes: cutting raw materials into flat plates of predetermined sizes at a cutting station; setting mounting positions for lifting brackets on the periphery of the flat plates; processing a bevel on the periphery outside the mounting positions of the lifting brackets; welding the lifting brackets to the mounting positions; lifting the flat plates to a rolling station to roll the flat plates into a curved ring plate; lifting the ring plate to a welding station; processing a bevel at the mounting positions of the lifting brackets, and simultaneously cutting off the lifting brackets. After completing the rolling of the flat plates and the lifting and transfer of the ring plates using the lifting brackets, the lifting brackets are cut off simultaneously while processing the bevel at the mounting positions of the lifting brackets. Thus, the beveling is completed during the removal of the lifting brackets. After the lifting brackets are removed, there is no need to grind the bracket feet or re-weld the ring plate, reducing unnecessary processing marks on the edge of the ring plate, avoiding the risk of stress concentration introduced by grinding or re-welding, and ensuring the low-temperature impact toughness of the ring plate edge.

This invention discloses a method and application for improving the low-temperature impact toughness of TC4 titanium alloy, belonging to the field of titanium alloy material preparation technology. The method of this invention sequentially employs electron beam cold hearth melting and vacuum consumable arc melting to prepare TC4 ingots with an oxygen content of 0.11-0.13%. The TC4 ingots are then annealed at the α+β two-phase region temperature, followed by holding and cooling to obtain a TC4 titanium alloy with an equiaxed microstructure. This invention overcomes the defects of existing TC4 titanium alloys, such as decreased impact toughness and brittle fracture at low temperatures, by precisely controlling the oxygen content within a narrow range of 0.11%-0.13% and combining α+β two-phase region annealing to form an equiaxed microstructure. This improves the low-temperature impact toughness of TC4 titanium alloys and makes them suitable for manufacturing high-reliability components for aerospace, polar equipment, and other low-temperature service environments.

This invention relates to the field of steel material manufacturing, addressing the problem that existing steels struggle to simultaneously ensure weather resistance and low-temperature toughness. It provides an engineering steel for extreme conditions and its short-process preparation method, comprising, by weight percentage: C 0.10%-0.15%, Si 0.17%-0.37%, Mn 1.60%-2.00%, Ni 2.5%-5.0%, Cu 0.35%-0.55%, Cr 0.35%-0.55%, V 0.13%-0.15%, and Nb 0.01-0.02%. This invention achieves weather resistance by eliminating high phosphorus (P) and adopting a Cu-Cr-high Ni composition, thus eliminating the harmful effects of P on temperature and toughness from the compositional source. It shifts from existing alloying compromise strategies to a method of compositional purification and alloy optimization, no longer relying on the harmful element P, but achieving steel performance suitable for extreme conditions through purification and a better alloy combination; simultaneously, the high Ni content also ensures high low-temperature impact toughness. This invention employs low-carbon Mn solid solution strengthening, V / Nb composite microalloying for fine grain strengthening, and precipitation strengthening to ensure higher strength in steel. The engineering steel provided by this invention not only has high strength and toughness but is also suitable for freeze-thaw environments as well as rainy environments.

The present application relates to the technical field of welding material, in particular to a high-toughness gas shielded welding wire and a preparation method thereof.The welding wire comprises a low-carbon steel belt sheath and a flux cored powder, and the flux cored powder comprises reduced iron powder, manganese powder, carbonyl nickel powder, molybdenum powder, titanium powder, silicon powder, graphite powder, rutile titanium dioxide, calcium fluoride, potassium fluorotitanate and cerium-aluminum co-doped microparticle powder; the cerium-aluminum co-doped microparticle powder takes calcium-rich borosilicate as a core, is treated by isopropanol aluminum hydrolysis polycondensation sealing, aluminum oxide nanoparticle enhancement, aluminum nitrate-colloidal silicon dioxide bridging and cerium nitrate outer layer, and is prepared; the welding wire is suitable for high-strength steel thick plate multi-layer multi-pass gas shielded welding, can improve low-temperature impact toughness and refine inclusions while maintaining high deposited metal strength.

The application discloses a low-temperature gas shielded welding wire, and chemical components and mass percentages of welding materials of the low-temperature gas shielded welding wire are as follows: C is less than or equal to 0.07%, Si is less than or equal to 0.6%, Mn is less than or equal to 1.6%, P is less than or equal to 0.010%, S is less than or equal to 0.008%, Cr is less than or equal to 1.0%, Ni is less than or equal to 4.0%, Cu is less than or equal to 0.10%, Mo is less than or equal to 0.5%, Ti is less than or equal to 0.10%, Al is less than or equal to 0.08%, V is less than or equal to 0.05%, O is less than or equal to 0.006%, As is less than or equal to 0.010%, Sn is less than or equal to 0.010%, Sb is less than or equal to 0.005%, Ca is less than or equal to 0.01%, and the total amount of other elements except Fe should be less than or equal to 0.5%. The low-temperature gas shielded welding wire has the advantages that the welding wire has excellent impact toughness in a low-temperature environment of-40 DEG C / -60 DEG C under a large-current high-heat-input welding process.

The application belongs to the technical field of high polymer materials, and discloses a PP / PA composite material for an automobile front end module and a preparation method thereof. By introducing tackifying resin and fumed silica into a PP / PA resin system to improve polarity, the PP / PA can be fully infiltrated and bonded when impregnated with long glass fibers, better wrap the glass fibers, form a close combination, improve the strength of the composite material, and prevent fiber floating. By introducing an organic-inorganic hybrid heat-resistant agent, the heat aging resistance of the composite material is enhanced. By introducing ethylene-butyl acrylate copolymer, the butyl acrylate ductile segment is used to prevent the glass fibers from being excessively shortened during injection molding processing, and good rigidity, strength and impact toughness are ensured. The obtained PP / PA composite material can provide sufficient tensile strength, impact toughness and high temperature resistance in terms of impact resistance, vibration resistance and heat dissipation when used in the automobile front end module, and promotes the wide application of the material in the lightweight automobile front end module.

The present application belongs to the technical field of hard alloy, and particularly relates to a WC-Ni-Fe coated WC-Co structure hard alloy and a preparation method thereof. The present application obtains WC-Co and WC-Ni-Fe hard alloy pretreatment materials with different strengths through pre-sintering, so that the two kinds of pretreatment materials can not only retain their independent structures, but also can be uniformly mixed under the premise of controllable particle size difference. After secondary ball milling, compounding and mixing, and sintering, the WC-Ni-Fe coated WC-Co structure hard alloy is obtained. The WC-Ni-Fe coated WC-Co structure hard alloy provided by the present application has super-high hardness, high wear resistance and excellent impact toughness, and has good structural stability, controllable cost, and composite structure hard alloy suitable for multiple complex working conditions, which solves the technical problems of traditional hard alloy, such as strength and toughness imbalance, single performance, poor environmental protection, and limited applicability.

This invention relates to the field of steel rolling technology and discloses a high-purity, high-toughness cold work die steel, comprising, by mass percentage: C 0.85–1.15%, Si 0.80–1.10%, Mn 0.20–0.50%, Cr 7.00–9.0%, W 0.40–0.80%, Mo 2.0–3.0%, V 0.4–1.0%, Nb 0.2–0.5%, S 0.005–0.012%, Al 0.20–0.50%, P ≤ 0.010%, La + Ce ≤ 0.08%, with the balance being Fe and unavoidable impurities. This invention also provides a method for preparing thick plates using this cold work die steel. The high-purity, high-toughness cold work die steel provided by this invention can improve the purity, carbide uniformity, and impact toughness of steel, overcoming the limitations of existing processes that can only use small ingots and are difficult to produce large-scale thick plates.

The present application relates to the technical field of metal material heat treatment, in particular to a kind of multiphase Dievar hot working die steel and its heat treatment method, the method includes the following steps: S1 to be handled Dievar steel is austenitized;S2 after austenitizing Dievar steel is with first isothermal temperature T1 is salt bath isothermal quenching, and keeps t1 time, T1 lower than the martensite transition start temperature of Dievar steel M s Point;S3 with second heating rate fast heating to second isothermal temperature T2, and keeps t2 time, T2 higher than the M s Point;S4 after processing Dievar steel is cooled to room temperature, and multiphase Dievar hot working die steel is obtained.The present application obtains the multiphase structure of martensite+ bainite+ residual austenite by multiphase heat treatment technology, hardness is kept at higher level while impact toughness is significantly improved.Multiphase structure processing technology expands the application range of Dievar steel, and can be applied to more complex die.

The application discloses a boride double-scale synergistically reinforced high-manganese steel-based wear-resistant casting and a preparation method thereof, and belongs to the technical field of wear-resistant metal materials and special casting. The casting takes high-manganese steel as a matrix, adopts micron-level TiB2 and nanometer-level ZrB2 to form double-scale boride reinforcing phases, controls the distribution of the reinforcing phases through a powder core wire mesh weaving technology, and forms a metallurgical bonding interface through spray deposition and isothermal annealing. The synergistic improvement of tensile strength, impact toughness and wear resistance is realized. The product is suitable for high-stress wear environments in the mining, metallurgy, building material and other industries, effectively solves the technical pain point that the strength and toughness of traditional high-manganese steel are difficult to be considered, the process is stable and controllable, and differential strengthening can be realized, and the product has industrial application value.

This invention relates to the field of metal matrix composite technology, and discloses a high-strength, toughness, and wear-resistant iron-based ceramic composite material, its preparation method, and its application. The composite material includes an iron-based alloy matrix and a reinforcement distributed therein. The preparation method mainly includes: mixing aluminum borate whiskers with tantalum powder, sintering them by spark plasma to form a porous preform, and then densifying the preform with iron-based alloy foil through a hot-pressing melting process. This invention, through a core-shell structure reinforcement design, utilizes a tantalum-rich shell layer to coordinate the performance differences between the ceramic phase and the iron matrix, strengthens the interfacial bonding, and thus simultaneously improves the hardness, flexural strength, impact toughness, and wear resistance of the composite material. This material is suitable for manufacturing components that withstand high-stress impact wear in fields such as mining machinery and engineering equipment.

The application discloses a preparation method of a carbon fiber unmanned aerial vehicle frame, selects high-strength carbon fiber fabric as a reinforcing material, and performs plasma treatment on the carbon fiber fabric, a treatment atmosphere is a mixed gas of argon and nitrogen, and the volume ratio of the argon to the nitrogen is 3:1; by adopting the plasma treatment of the specific atmosphere and power, active groups and micro fine rough structures are effectively introduced on the surface of the carbon fiber without damaging the strength of the carbon fiber body, and the chemical bonding and mechanical anchoring effect of the carbon fiber and the resin are significantly enhanced. Meanwhile, bisphenol A type and phenolic type epoxy resins are compounded in an epoxy resin matrix, and nano aluminum oxide particles are added, and synergistic toughening is achieved. The phenolic epoxy resin improves the crosslinking density and heat resistance, and the nano particles can initiate a silver wire and a passivated crack tip, so that the impact toughness and damage tolerance of the composite material are greatly improved, and the frame is not prone to brittle cracking when slight collision or impact is borne.