1830 results about "Impact toughness" patented technology

The invention discloses a high-impact-toughness Ti80 titanium alloy forging stock with the extra-large specification of more than 9 tons and a manufacturing method. The manufacturing method comprises the following steps: S1) adopting a Ti80 titanium alloy cast ingot with the diameter of 960-1060 mm and the weight of 9-17 tons; (S2) cogging and forging are conducted, the cast ingot is subjected to upsetting and drawing for 2-5 heating numbers in a beta-phase region, and the upsetting and drawing deformation of each heating number is 30-55%; (S3) intermediate forging is conducted, specifically, the blank is subjected to 3-4 heating number upsetting and drawing in a beta-phase region, the upsetting and drawing deformation of each heating number is 30-55%, and air cooling is conducted after upsetting and drawing; and (S4) finished product forging is conducted, 3-5 heating number drawing is conducted at the temperature 30-60 DEG C below the phase transformation point, the deformation of each heating number is 10-30%, and the total deformation is larger than or equal to 50%. The thickness of the obtained forging stock is 200-500 mm, the width is 1000-2500 mm, the length is 2000-4000 mm, and after the forging stock is annealed, the tensile strength of each position is larger than or equal to 840 MPa, the yield strength is larger than or equal to 740 MPa, the ductility is larger than or equal to 10%, and the impact energy is larger than 60 J. And the obtained forging stock is uniform in structure, the material is not cracked in the forging process, and the yield and the impact toughness after annealing are improved.

The GPa-grade ultrahigh-strength anti-fatigue steel comprises the following chemical components in percentage by weight: 0.02 to 0.07 percent of C, 0.10 to 0.25 percent of Si, 1.75 to 2.50 percent of Mn, 0.022 to 0.026 percent of P, less than or equal to 0.008 percent of S, 0.03 to 0.04 percent of Nb, 0.09 to 0.15 percent of V, 0.045 to 0.055 percent of Ti, 0.50 to 0.80 percent of Mo, 2.00 to 2.40 percent of Cr, 8.0 to 10.0 percent of Ni, 8.0 to 12.0 percent of Co, 0.035 to 0.045 percent of Als, 0.013 to 0.014 percent of N, 0.58 to 0.62 percent of Cu, 0.03 to 0.05 percent of Sb, 0.03 to 0.05 percent of RE and 0.0008 to 0.001 percent of B. The method comprises the steps of smelting, continuous casting, rapid cooling, casting blank heating, rolling and heat treatment. The maximum thickness of the steel plate is 100mm, Rp0.2 is 1080-1120MPa, A is greater than or equal to 18%, and the fatigue life gt under the peak stress of 560MPa; the impact energy at-60 DEG C is greater than or equal to 150J, and the marine atmosphere corrosion resisting rate is 1t; and 0.10 mm / a. The strength of the steel is improved, the impact toughness of the steel plate at low temperature is improved, and the corrosion resistance and the fatigue resistance of the steel are improved.

The invention discloses a method for homogenizing a microstructure of a low-temperature high manganese steel welding heat affected zone by using pulse current, and belongs to the technical field of welding and postweld heat treatment of high manganese steel for liquefied natural gas (LNG) storage and transportation. The treatment method comprises the following steps: (1) sampling a heat affected zone of the low-temperature high-manganese steel welded joint with microstructure gradient distribution; (2) the low-temperature high manganese steel welding heat affected zone sample is subjected to pulse current treatment at the room temperature, the pulse frequency ranges from 0.6 kHz to 6 kHz, the pulse width ranges from 0.2 ms to 6 ms, the current density ranges from 20 A / mm < 2 > to 200 A / mm < 2 >, and the treatment time ranges from 5 min to 120 min; and (3) grinding and polishing the sample, observing and analyzing the element distribution state in the heat affected zone, and quantitatively representing the grain boundary structure characteristics. According to the method, atomic diffusion, dislocation slippage and grain boundary migration of the low-temperature high-manganese steel welding heat affected zone can be promoted by applying the pulse current, redistribution of segregated atoms and dislocations in grains and at grain boundaries is rapidly achieved, and then the purposes of improving the microstructure uniformity of the low-temperature high-manganese steel welding heat affected zone and improving the impact toughness of the low-temperature high-manganese steel welding heat affected zone are achieved. The method is easy to operate, short in treatment time, environmentally friendly and particularly suitable for postweld treatment of low-temperature high manganese steel parts.

The invention discloses a welding method for heterogeneous multi-wire in-situ metallurgy of a submerged arc pipe of a hydrogen conveying pipeline, and aims to solve the problem of hydrogen-induced failure caused by the problems of coarse weld structure, secondary phase particle aggregation, low-temperature impact toughness and the like caused by a traditional multi-wire submerged arc welding method. The welding method comprises the steps that firstly, the to-be-welded face of the hydrogen conveying pipeline is polished and cleaned; and secondly, the cleaned hydrogen conveying pipeline to be welded is welded through three-wire submerged arc welding, H08MnMoTiB is adopted as a first welding wire, BH60GX-III is adopted as a second welding wire, H08Mn2NiA is adopted as a third welding wire, the components of the three welding wires are optimized, and the technological parameters such as the wire feeding speed, the current and the voltage of the three welding wires are optimized and adjusted. According to the method, the idea of in-situ metallurgy and multi-wire submerged arc welding are fused, the alloy component proportion of transition metal of a welding pool is achieved by changing the wire feeding speed of different welding wires, and different welding process parameters are supplemented, so that quantitative adjustment of the cladding metallurgy performance of a welding seam is achieved, and the hydrogen-induced corrosion resistance is improved.

The invention provides a high-lightning-stroke-resistant toughness continuous carbon fiber reinforced composite material, which is obtained by paving a plurality of layers of continuous carbon fiber resin prepregs and intercalation layers to obtain a preform and curing the preform through a conventional composite material molding process, each resin-based prepreg layer used in a preset layer number range close to the anti-lightning side is a first resin prepreg layer, the other resin-based prepreg layers are second resin prepreg layers, an intercalation is arranged between every two adjacent second resin prepreg layers, and the intercalation material is a micron conductive material with the surface density of 2-20 g / m < 2 >; wherein the resin in each resin-based prepreg layer is added with 2-10wt% of carbon nanomaterial, and the compressive strength of the rest resin-based prepreg layers after impact is higher than 250MPa. The composite material provided by the invention realizes integrated compounding of high lightning stroke resistance and high impact toughness. The anti-lightning performance of the composite material can meet the requirements of no internal layering and low fiber damage on the surface, and meanwhile, the compression strength CAI after impact can reach more than 200MPa.

The invention provides a method for obtaining the optimal low-temperature impact toughness and a welded body, and the method comprises the following steps: S1, obtaining chemical components of sample steel, and calculating the cooling rate corresponding to the bainite phase change curve nose tip temperature of the sample steel; s2, the cooling rate serves as the key cooling rate of the welding heat cycle process, and the corresponding welding heat input amount is calculated; s3, cutting a plurality of cuboid thermal simulation initial samples of which the length directions are parallel to the rolling direction of the steel plate from the sample steel; s4, two-pass welding thermal simulation cycle experiments at different temperatures are set; s5, two thermocouples are welded to the center of the cuboid thermal simulation initial sample for temperature measurement, and a welding simulation experiment is completed; and S6, size machining is conducted on the welding sample, a low-temperature impact experiment is conducted, impact energy under different technologies is measured, and the optimal impact toughness of CGHAZ and ICCGHAZ is determined. The method can be used for developing and optimizing the welding process with insufficient low-temperature impact toughness of the submerged-arc welding heat affected zone of the low alloy steel.

The invention relates to the technical field of traffic infrastructure maintenance, and particularly discloses a method for evaluating the anti-collision toughness of a rusted steel bar bridge structure after ship collision, and the method comprises the following steps: firstly, building a rusted bridge pier finite element model based on a rusted steel bar concrete theoretical degradation model; simulating ship collision by adopting an equivalent static method, and determining dynamic damage factors of the ship; structural nonlinear static analysis and nonlinear dynamic analysis are conducted by considering sudden external force to obtain a bridge function loss function, and then a bridge function is calculated; constructing a response surface agent model to perform dynamic response prediction; determining a bridge structure damage state judgment criterion; the vulnerability of the rusted bridge is calculated through Monte Carlo simulation; and according to the bridge function loss function, combining the repair time and the recovery function to calculate a structure anti-collision toughness index. The method provided by the invention fills up the blank of ship collision resistance toughness evaluation of the coastal rusted bridge pier, provides a scientific basis for bridge safety evaluation and maintenance decision, and is of great significance for guaranteeing safe operation of the bridge.

The invention belongs to the field of steel rail manufacturing, and discloses a method for improving the impact toughness matching performance of a dissimilar material steel rail welding joint. The method comprises the following steps: carrying out first-stage cooling on a welding joint formed by welding the eutectoid pearlite steel rail and the bainite steel rail; carrying out full-section normalizing heating on the welded joint; the welding joint is subjected to second-stage cooling, a heat affected zone on one side of the heat treatment type eutectoid pearlite steel rail is cooled to 350-400 DEG C at the cooling rate of 4.0-7.0 DEG C / s, and a heat affected zone on one side of the hot rolling type bainite steel rail is cooled to 290-315 DEG C at the cooling rate of 2.0-3.0 DEG C / s; the welding joint is heated to a bainite transformation temperature interval for isothermal treatment; and naturally cooling the welding joint in an air environment. According to the method provided by the invention, the room-temperature impact toughness of the heat affected zone on one side of the hot-rolled bainite steel rail can be obviously improved, so that the performance of the hot-rolled bainite steel rail is better matched with that of a hot-rolled bainite steel rail base material.

The invention discloses high-performance corrosion-resistant maritime work steel and a production method thereof, and the steel comprises the following chemical components: 0.02%-0.07% of C, 0.10%-0.25% of Si, 1.75%-2.50% of Mn, 0.022%-0.026% of P, less than or equal to 0.008% of S, 0.055%-0.060% of Nb, 0.035%-0.045% of Als, 0.90%-1.00% of Cr, 0.90%-1.00% of Ni, 0.20%-0.25% of Co, 0.0130%-0.0114% of N, 0.06%-0.065% of V, 0.035%-0.042% of Ti, 0.45%-0.52% of Cu, 0.03%-0.05% of Sn and 0.03%-0.05% of RE. Through smelting, slab continuous casting, casting blank heating, rolling and cooling, the Rp0.2 of the steel is 550-582 MPa, A is larger than or equal to 20%, the impact energy at the temperature of-80 DEG C is larger than or equal to 200 J, the corrosion resistance rate is smaller than 0.090 mm / a, the fatigue life under the load of the peak stress of 280 MPa is longer than 2 million times, the maximum thickness can reach 150 mm, and the Z-direction performance is larger than or equal to 40%. The problems that an existing steel plate for ocean engineering is low in strength, poor in low-temperature impact toughness and insufficient in corrosion resistance and fatigue resistance are solved.

The invention discloses a high-strength steel welding rod for 1000 MPa water and electricity and a preparation method and application of the high-strength steel welding rod. The invention belongs to the technical field of welding materials. The technical problems that the low-temperature impact toughness of an existing welding material for 1000 MPa-grade high-strength steel needs to be improved, and the welding cold crack sensitive index is too large are solved. The welding rod is composed of a core wire and a coating wrapping the surface of the core wire. Powder of the coating is formed by mixing marble, fluorite, rutile, silica powder, electrolytic manganese, ferrosilicon, graphite, ferromolybdenum, chromium metal, iron powder, nickel powder, sodium carbonate and sodium alginate. The welding rod has the advantages of good all-position welding process performance, stable electric arc, small flying speed, uniform coating melting, beautiful weld joint forming and good operability of welders. And weld metal has good mechanical properties. And the method is used for welding the high-strength steel for the 1000MPa-grade water

The invention discloses high-performance anti-fatigue steel for ocean engineering and a production method of the high-performance anti-fatigue steel. The steel comprises the following chemical components: 0.02%-0.07% of C, 0.10%-0.25% of Si, 1.75%-2.50% of Mn, 0.022%-0.026% of P, less than or equal to 0.008% of S, 0.065%-0.070% of Nb, 0.070%-0.075% of V, 0.035%-0.042% of Ti, 1.25%-1.45% of Cr, 1.25%-1.45% of Ni, 0.30%-0.35% of Co, 0.035%-0.045% of Als, 0.0150%-0.0260% of N, 0.45%-0.50% of Cu, 0.03%-0.05% of Sb and 0.03%-0.05% of RE. Through smelting, slab continuous casting, casting blank heating, rolling, cooling and heat treatment, the Rp0.2 of the steel is 690-750 MPa, A is larger than or equal to 20%, the impact energy at the temperature of-80 DEG C is larger than or equal to 200 J, the corrosion resistance rate is smaller than 0.090 mm / a, the fatigue life under the peak stress load of 350 MPa is longer than 2 million times, the maximum thickness can reach 150 mm, and the Z-direction performance is larger than or equal to 40%. The problems that an existing steel plate for ocean engineering is low in strength, poor in low-temperature impact toughness and insufficient in corrosion resistance and fatigue resistance are solved.

The invention discloses a rare earth-containing 500HB-grade high-toughness wear-resistant steel plate, which is characterized by comprising the following chemical components in percentage by mass: 0.24 to 0.28 percent of C, 0.15 to 0.25 percent of Si, 0.30 to 0.55 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.0015 percent of S, 0.90 to 1.10 percent of Cr, 0.05 to 0.70 percent of Mo, 0.05 to 0.25 percent of Ni, 0.002 to 0.005 percent of Ti, 0.055 to 0.065 percent of Nb, 0.010 to 0.020 percent of V, 0.0005 to 0.0010 percent of B, 0.070 to 0.085 percent of Alt, less than or equal to 0.0050 percent of N, less than or equal to 0.0003 percent of H, less than or equal to 0.60 percent of Ceq, more than or equal to 80ppm of rare earth Ce and compared with conventional wear-resistant steel, the corrosion resistance is improved by 20%.

The invention provides impact-resistant high-toughness plastic as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. Comprising the following raw materials in parts by weight: 35-45 parts of hydroxyl-terminated hyperbranched polycarbonate, 15-25 parts of LDPE (Low-Density Polyethylene) resin, 8-12 parts of inorganic filler, 4-6 parts of isocyano ethyl methacrylate, 1-3 parts of bis (1-vinyl imidazole-2-) ketone, 1-3 parts of bis (trimethylsilylated) vinyl phosphate, 1-3 parts of 1, 3, 5-triglycidyl-S-triazinetrione, 1-3 parts of 3, 3 '-diamino-4, 4'-diphenyl-1, 3, 4-triazole-2-ketone, 1-3 parts of 1, 3, 5-triazole-2-ketone, 1-3 parts of 1, 3 '-trimethylsilylated vinyl phosphate, 1-3 parts of 2, 3'-diphenyl-1, 3, 4, 5- The material is prepared from the following components in parts by weight: 1-3 parts of 4, 4 '-difluorodiphenyl sulfone, 2-4 parts of a coupling agent, 0.5-1.5 parts of an antioxidant, 0.8-1.2 parts of a compatilizer, 0.7-1 part of a catalyst and 0.8-1 part of an initiator. The plastic has the advantages of favorable mechanical properties, favorable heat aging resistance, favorable impact toughness, favorable flame retardancy and favorable environmental friendliness.

The invention discloses a heat treatment method for improving the low-temperature impact performance of 12Cr13 martensitic stainless steel in the technical field of heat treatment. The heat treatment method comprises the following steps that S1, water quenching pretreatment is conducted, specifically, a forge piece is heated to 940-960 DEG C, and heat preservation is conducted for 1-2 h; s2, quenching cooling: after heat preservation of the forge piece is finished, discharging and water-cooling; s3, quenching and heating: heating the forge piece to 830-850 DEG C, and keeping the temperature for 1-2 hours; s4, quenching cooling: discharging and water-cooling the forged piece after heat preservation is finished; s5, high-temperature tempering is conducted, specifically, the forge piece is heated to 600-680 DEG C, and heat preservation is conducted for 3.5-4.5 h; and S6, tempering and cooling, wherein after heat preservation is finished, discharging and air cooling are conducted, and cooling is conducted to the room temperature. According to the method, the material fastener forge piece is subjected to water quenching pretreatment and fine grain treatment, then the fastener forge piece is heated at the temperature lower than the conventional austenitizing temperature for subcritical quenching, a small amount of retained austenite structures are obtained, and the 0 DEG C impact toughness of the 12Cr13 material fastener forge piece is improved.

The invention discloses a preparation method of a stainless steel layered composite plate, which comprises the following steps: (1) grinding the surfaces of a stainless steel plate and a carbon steel plate which need to be compounded, then forming air exhaust holes in the edges of the opposite positions of the same ends of the stainless steel plate and the carbon steel plate, and laminating the stainless steel plate and the carbon steel plate to form an initial layered plate; (2) sealing and welding the periphery of the initial laminated plate; (3) the initial layered plate is subjected to air exhaust treatment through the air exhaust holes, and a layered composite plate blank is obtained; and (4) carrying out hot isostatic pressing treatment on the layered composite plate blank, after the hot isostatic pressing treatment is finished, carrying out pressure relief, cooling, discharging and air cooling to room temperature, then carrying out heating and hot rolling treatment, and finally straightening. By means of the method, the stainless steel layered composite plate with the large-range thickness can be prepared, the plate shape is good, stainless steel and carbon steel form compact and inclusion-free metallurgical bonding, the bonding strength reaches 360 MPa or above, the tensile strength and impact toughness of the composite plate are good, and the stainless steel intergranular corrosion performance is qualified.

The invention provides a low-temperature-impact-resistant food packaging material and a preparation method and application thereof.The low-temperature-impact-resistant food packaging material is prepared from, by mass, 100 parts of polylactic acid, 1-10 parts of modified layered double hydroxide and 5-40 parts of hyperbranched polyester; wherein the modified layered double hydroxide is obtained by treating layered double hydroxide with a composite anionic surfactant and then treating the treated layered double hydroxide with an organic cationic compound with a long alkyl chain; the composite anionic surfactant comprises a first anionic surfactant and a second anionic surfactant; wherein the first anionic surfactant comprises sodium dodecyl sulfate; the second anionic surfactant comprises a sulfonate anionic surfactant containing an amido bond and a catechol structure. Through the formula design, the impact toughness of the material at low temperature can be improved while the mechanical property of polylactic acid is maintained, and the material can be suitable for the field of food packaging.

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 invention relates to precipitation-hardening stainless steel and a preparation method and application thereof. The stainless steel comprises the following chemical components: 0.05%-0.25% of C, 0-0.15% of Si, 0.2%-0.5% of Mn, 9%-18% of Cr, 0.2%-5% of Ni, 0.5%-5% of Mo, 0-0.5% of V, 5%-13% of Co and the balance of Fe and inevitable impurities. During preparation, alloy raw materials are forged or rolled after being smelted and cast, or prepared into spherical alloy powder through an atomization method / rotating electrode method and then subjected to 3D printing, a formed component is prepared, and then the product is obtained through aftertreatment. By controlling the proportion of alloy elements and cooperating with an optimized post-treatment process, the dispersion degree and strengthening effect of second-phase precipitation are improved, impact toughness is improved, 3D printing cracking is avoided, excellent comprehensive mechanical properties, especially high-temperature strength, are obtained, the fatigue cracking risk is reduced, the service life is prolonged, and the production cost is reduced. And the corrosion resistance of polishing, machining and complex environments is improved, and the mold can be used in the field of molds.

The invention relates to high-strength microcrystalline glass and a preparation method thereof, and belongs to the technical field of composite materials. The high-strength glass ceramic is prepared from cullet, titanium dioxide, spodumene, potassium carbonate, lanthanum oxide, boron nitride, barium oxide, zirconium oxide and modified carbon fibers as raw materials, and the invention further discloses a formula of the raw materials. According to the high-strength glass ceramic, the modified carbon fibers serve as a reinforcing phase, the problem that the glass ceramic has brittleness and is prone to breakage is solved, the modified carbon fibers and a glass ceramic base material are good in phase property, and therefore the prepared glass ceramic is excellent in mechanical performance, the highest impact toughness can reach 3.91 KJ / cm < 3 >, the highest compressive strength can reach 371.28 MPa, and the glass ceramic can be used as a high-strength glass ceramic. The breaking strength can reach 46.93 MPa to the maximum, and in addition, the modified carbon fiber can also improve the thermal stability of the microcrystalline glass and solve the yield influence caused by thermal stress.

The invention discloses 15Ni steel for an ultralow-temperature liquid hydrogen storage tank and a preparation method of the 15Ni steel, and belongs to the technical field of metallurgy. The 15Ni steel comprises the following chemical components in percentage by mass: 0.02%-0.07% of C, 0.10%-0.30% of Si, 0.20%-0.80% of Mn, 0.15%-0.30% of Mo, 0.020%-0.050% of Al, 12.5%-15.5% of Ni, 0.0015%-0.0060% of N, less than or equal to 0.008% of P, less than or equal to 0.002% of S, less than or equal to 0.020% of Nb, less than or equal to 0.080% of V, less than or equal to 0.020% of Ti and the balance of Fe and inevitable impurities. The preparation method comprises the procedures of smelting, continuous casting, heating, rolling and heat treatment. The steel plate produced by the invention has excellent ultralow temperature (-269 DEG C) impact toughness, effectively solves the problems of brittle phase martensite precipitation and low strength of stainless steel at a low temperature of-196 DEG C, can replace stainless steel to be widely used for manufacturing large ultralow temperature liquid hydrogen storage tanks, and has wide application prospects.

The invention discloses a high-impact-toughness Ti80 titanium alloy plate with the thickness larger than or equal to 50 mm and a preparation method. The preparation method comprises the steps that S1, a Ti80 plate blank with the thickness ranging from 200 mm to 500 mm is selected; (S2) plate blank rolling is conducted, specifically, after the plate blank is heated, the plate blank is subjected to 1-2 heating number rolling, a plate with the thickness ranging from 50 mm to 180 mm is obtained, the total rolling deformation ranges from 60% to 90%, and the finish rolling temperature is larger than or equal to T beta-250 DEG C, and (S3) plate straightening is conducted. According to the method, surface micro-hardening of the thick normalized intermediate-state plate blank is achieved through intermittent cooling, meanwhile, by controlling the rolling deformation amount and distribution of the deformation amount, deformation can permeate into the softened core portion more capacity, the core portion structure is refined, and the toughness of the core portion is improved; the problems that the surface and the core of the Ti80 titanium alloy thick plate (the thickness is larger than or equal to 50 mm) are inconsistent in structure, and the impact toughness of the core is insufficient are solved, and the prepared Ti80 titanium alloy thick plate can meet the requirement of ocean engineering equipment for thick plates.

The invention discloses a large-size thick-specification 800MPa-grade high-strength and high-toughness hydroelectric steel plate and a preparation method thereof, and belongs to the technical field of steel production, the large-size thick-specification 800MPa-grade high-strength and high-toughness hydroelectric steel plate comprises the following chemical components in percentage by mass: 0.06 to 0.12 percent of C, 0.80 to 1.50 percent of Mn, 0.12 to 0.30 percent of Si, 0.2 to 0.3 percent of Cu, 0.3 to 0.6 percent of Cr, 0.3 to 0.6 percent of Mo, 0.0012 to 0.0020 percent of B, 0.008 to 0.016 percent of Ti, 0.015 to 0.040 percent of Nb, 0.025 to 0.060 percent of Alt, 1.80 to 2.50 percent of Ni, less than or equal to 0.01 percent of P, less than or equal to 0.003 percent of S and the balance of Fe and other inevitable By limiting the short-process preparation process of blank smelting, continuous casting, homogenization, two-stage controlled rolling, online quenching and tempering water cooling, the steel plate has the performance of high strength, high low-temperature impact toughness and high elongation at the same time; the requirements of the hydroelectric steel for high strength, high low-temperature impact toughness and high ductility can be met, the application scene of the hydroelectric steel is considered, and good corrosion resistance is achieved.

The invention relates to the technical field of powder metallurgy materials, and discloses rare earth microalloyed ultrahigh-strength high-toughness hot work die steel and a preparation method thereof.The die steel is prepared from 4Cr5MoSiV1 pre-alloyed powder, rare earth hydride, boron carbide and porous amorphous carbon powder loaded with a nickel catalyst. The preparation method comprises the steps of material mixing, sheath packaging, graded dynamic reaction thermal devolatilization, hot isostatic pressing densification and heat treatment, in the graded dynamic reaction thermal devolatilization, active hydrogen generated by decomposition of rare earth hydride is used for reducing oxide on the surface of powder, and nickel catalyzed carbon powder is used for capturing water vapor at low temperature to generate CO to be discharged. An oxide film on the surface of the powder is thoroughly removed through in-situ chemical reaction, original particle boundaries are eliminated, meanwhile, a nano strengthening phase with high thermal stability is generated in situ, and the high-temperature strength, impact toughness and tissue compactness of the die steel are remarkably improved.

The invention discloses a sintered neodymium-iron-boron magnet and a preparation method and application thereof. The magnet comprises main phase crystal particles with RE2Fe14B structures and a grain boundary phase. The grain boundary phase comprises a two-particle grain boundary phase between two main phase crystal particles and a grain boundary triple-phase point composed of more than three main phase crystal particle gaps; the ratio of the number of the main phase crystal particles to the number of grain boundary triphase points is smaller than or equal to 3. According to the sintered neodymium-iron-boron magnet, through proper component design, reasonable control over the (Cu + Ga) / X ratio and control over the thickness of an alloy sheet and the ratio relation between the average width of columnar crystals in the alloy sheet and the granularity of magnetic powder, concentrated distribution of grain boundary three-phase points can be effectively restrained, the grain boundary phase proportion can be increased, grain boundary phase distribution can be optimized, and the performance of the sintered neodymium-iron-boron magnet can be improved. Therefore, both high magnetic performance and high impact toughness are achieved. The sum of the magnetic energy product and the coercive force of the sintered neodymium-iron-boron magnet is larger than or equal to 75, the impact toughness of the sintered neodymium-iron-boron magnet is larger than or equal to 20 kJ / m < 2 >, and the sintered neodymium-iron-boron magnet can be applied to new energy automobile motors, energy-saving

The invention relates to the field of composite materials, and discloses a carbon fiber shell of a camera and a preparation method thereof, the carbon fiber shell comprises the following components: a carbon fiber reinforcement layer, the carbon fiber is subjected to oxidation treatment and coated with an interface coating, and the interface coating comprises a silane coupling agent and nanoparticles; the matrix resin is prepared from epoxy resin, a flexible reinforcing agent, a shape memory functional monomer, a dynamic crosslinking component, a nano reinforcing component and a curing agent; the intelligent functional coating comprises a temperature-sensitive polymer and a conductive filler; the carbon fiber reinforcement layer is made of carbon fibers subjected to acid liquor oxidation treatment, and the acid liquor is composed of nitric acid and sulfuric acid according to the volume ratio of 1: 3. The impact toughness and recovery capability are enhanced through the dynamic crosslinking matrix, the bonding strength is improved through the nano-particle interface coating, dynamic rigidity adjustment and crack monitoring are achieved through the intelligent functional coating, the service life is prolonged, and the problems of brittleness failure and insufficient long-term stability of an existing shell are solved.

The invention provides a coal mine hydraulic support gas shield welding wire with the strength higher than 900 MPa and a preparation method of the coal mine hydraulic support gas shield welding wire. The gas shield welding wire comprises, by mass, 0.03%-0.06% of C, 0.51%-0.70% of Si, 1.35%-1.64% of Mn, smaller than or equal to 0.010% of P, smaller than or equal to 0.005% of S, 0.20%-0.38% of Cr, 2.35%-2.65% of Ni, 0%-0.09% of Cu, 0.45%-0.70% of Mo, 0.015%-0.030% of Ti, 0.025%-0.035% of Nb, 0.002%-0.006% of Ce, 0.0005%-0.0012% of B, smaller than or equal to 0.004% of O, smaller than or equal to 0.006% of N and the balance Fe and The invention has the following beneficial effects: (1) through reasonable design of chemical components, the yield strength of weld metal is greater than or equal to 820 MPa, the tensile strength is greater than or equal to 900 MPa, the ductility is greater than or equal to 21%, and the low-temperature impact toughness at-40 DEG C is greater than or equal to 75 J; (2) inclusions in a weld joint are dispersed and refined after the welding wire is welded, refined acicular ferrite instead of bainite and martensite is taken as a main structure, and the strength and toughness of the weld joint are excellent; and (3) the composition proportion of the welding wire is optimized, a stable welding wire preparation process is developed according to the components, and the comprehensive performance of the high-strength coal mine hydraulic support welding seam is considered.

The invention relates to the technical field of metal materials, and discloses steel for a battery shell and a preparation method of the steel. The steel for the battery case comprises the following chemical components in percentage by weight: 0.001%-0.004% of C, 0.01%-0.02% of Si, 0.12%-0.22% of Mn, 0.004%-0.01% of P, less than or equal to 0.004% of S, 0.2%-0.4% of Cr, 0.02%-0.05% of Al, 0.015%-0.035% of Ti, 0.001%-0.003% of B, 0.01%-0.03% of Nb and the balance of Fe and inevitable impurities. By accurately controlling the components in the steel, particularly controlling the C content, the niobium content and the chromium content in a proper range, the yield strength, the tensile strength and the ductility of the steel can be improved, and particularly the low-temperature impact toughness of the steel can be improved.

The invention relates to the field of ferrous metallurgy and forge piece manufacturing, in particular to high-toughness, ultra-pure and large-quenching-depth 40CrNiMoRE rare earth special steel for a large ring piece and a preparation method of the high-toughness, ultra-pure and large-quenching-depth 40CrNiMoRE rare earth special steel. The invention relates to a high-temperature-resistant steel material, which comprises the following chemical components in percentage by weight: 0.3 to 0.5 percent of C, 0.1 to 0.5 percent of Si, 0.4 to 0.8 percent of Mn, 0.5 to 1.5 percent of Cr, 0.5 to 1.5 percent of Ni, 0.1 to 0.5 percent of Mo, 0.05 to 0.30 percent of V, 0.0005 to 0.0030 percent of B, 0.005 to 0.030 percent of RE and the balance of Fe and inevitable impurities. Through V, B and RE comprehensive microalloying, molten steel purification, inclusion modification and grain refinement, the hardenability is improved, and the surface quenching layer depth, hardness uniformity and impact toughness are ensured. And moreover, the high-toughness, ultra-pure and large-quenching-depth large ring piece is obtained through preparation technologies such as pure smelting, airtight protection pouring and uniform deformation, and the technical problems that an existing large ring piece is low in purity, poor in toughness, insufficient in hardenability, cracked in surface quenching and the like can be effectively solved.

The invention provides a nano composite tungsten-based alloy. The alloy comprises the following components in parts by weight: 84.0 to 87.0 parts of W powder, 7.0 to 9.0 parts of N powder, 3.0 to 5.0 parts of Fe powder, 0.2 to 0.5 part of Co powder, 1.5 to 2.5 parts of Mo powder, 0.8 to 1.0 part of Zr powder, 0.5 to 0.8 part of Cr powder, 0.3 to 0.5 part of Mn powder, 0.4 to 0.5 part of B powder, 0.2 to 0.4 part of Ta powder, 0.1 to 0.3 part of Hf powder, 0.1 to 0.2 part of V powder, 0.1 to 0.3 part of T powder, 0.1 to 0.2 part of silicon carbide powder, 0.1 to 0.2 part of aluminum nitride powder, 0.3 to 0.5 part of yttrium oxide powder and 0.1 to 0.2 part of lanthanum oxide powder. The yield strength of the nano-composite tungsten-based alloy can reach 1270-1520 MPa, the tensile strength of the nano-composite tungsten-based alloy is 1430-1680 MPa, the ductility of the nano-composite tungsten-based alloy is 6-12%, and the impact toughness of the nano-composite tungsten-based alloy is 130-220 J / cm < 2 >.

The invention discloses a process for improving impact toughness of Ti80 titanium alloy, and belongs to the technical field of metal heat treatment. The method comprises the steps that S1, a Ti80 titanium alloy cast ingot is subjected to upsetting and drawing, and a blank is obtained; s2, the blank obtained in the step S1 is subjected to two-heating-number rolling, and a rolled sample is obtained; s3, performing first heat treatment on the rolled sample obtained in the step S2 to obtain a heat-treated sample; and S4, carrying out secondary heat treatment on the heat treatment sample obtained in the step S3. According to the method, the Ti80 titanium alloy with the tri-state structure is prepared, the alloy toughness is greatly improved under the condition that the alloy strength is guaranteed, the Ti80 titanium alloy has more excellent impact load bearing capacity, and the application scene range of the Ti80 titanium alloy is expanded.