3772 results about "Plasticity" patented technology

The invention discloses a steel wire rod for a 2300-2360 MPa grade stress corrosion resistant steel strand, the steel strand and a preparation method. The steel wire rod comprises the following chemical components in percentage by mass: 0.85-0.91% of C, 0.3-1.0% of Si, 0.2-0.8% of Mn, 0.15-0.45% of Cr, 0.02-0.05% of V, less than or equal to 0.008% of S, less than or equal to 0.010% of P, less than or equal to 0.004% of N, less than or equal to 0.0020% of O and the balance of Fe and other inevitable impurities. The steel wire rod has excellent strength and plasticity, the ultrahigh strength of 2300 MPa or above can be obtained through drawing with a small area reduction rate, surface damage and internal defects of the steel wire rod during subsequent drawing machining are reduced, and the stress corrosion index of the steel strand is improved.

The invention discloses a steel wire rod for a 2200-2260 MPa grade ultrahigh stress corrosion resistance prestressed steel strand, the steel strand and a production method of the steel strand, and the steel wire rod comprises the following alloy components in percentage by mass: 0.83-0.89% of C, 0.60-1.40% of Si, 0.20-0.80% of Mn, 0.15-0.50% of Cr, less than 0.30% of Cu, less than 0.30% of Ni, less than 0.30% of Mo, 0.01-0.05% of V, 0.001-0.05% of Nb, less than or equal to 0.008% of S, less than or equal to 0.010% of P, less than or equal to 0.0040% of N, less than or equal to 0.0020% of O and the balance of Fe and other inevitable impurities, through component design and a reasonable after-rolling controlled cooling process, the microstructure is refined, the sorbite rate is improved, high strength and plasticity are obtained with low carbon content, the drawing deformation can be reduced, material damage can be reduced, and the corrosion resistance of the steel strand is improved.

The invention discloses a preparation method of a medical titanium-zirconium alloy bar wire. The preparation method comprises the processes of ingot casting, forging, quenching, hot rolling, quenching, cold rolling, recrystallization annealing, severe plastic deformation, drawing, straightening, annealing and surface treatment. The microstructure of the alloy is regulated and controlled by introducing high-density defects into the material through severe plastic deformation and combining quenching heat treatment, preparation of the titanium-zirconium alloy with high strength and plasticity and good fracture toughness is achieved, and equiaxial ultra-fine grain titanium-zirconium alloy bars and wires with the diameter ranging from 1 mm to 8 mm and the length larger than 600 mm can be produced in batches. High strength and high fatigue strength can be obtained, and the requirements of dental medical instruments for raw materials are met.

The invention provides a preparation method of an isotropic Ti2AlNb / TiAl-based interpenetrating composite material, and belongs to the technical field of intermetallic compound-based composite materials. The method comprises the following steps: firstly, designing a Ti2AlNb reinforcement framework of various TPMS configurations by utilizing implicit function modeling; then, carrying out anisotropy research on the TPMS configuration by utilizing finite element simulation; secondly, a Ti2AlNb reinforcement framework of a TPMS configuration is prepared through a selective laser melting (SLM) technology; and finally, the TPMS configuration Ti2AlNb / TiAl-based interpenetrating composite material is prepared through vacuum hot pressing sintering of HPS. Therefore, strong anisotropy of a traditional fiber reinforced composite material in mechanical property is avoided, good matching of strength, plasticity and toughness of the composite material is achieved, and a new thought and a new solution are provided for breaking through the application bottleneck of TiAl in spaceflight power system hot end components.

The invention provides a data correction method and system combined with lattice structure additive manufacturing process characteristics, and the method comprises the steps: firstly employing a Newton iteration method, taking the radius of a pillar as a variable, optimizing the relative density of an iteration target and generating a lattice structure geometric model under the condition that a process constraint condition is satisfied, and extracting actual geometric parameters after forming through CT scanning, the elastic modulus is corrected through the pillar diameter deviation and the defect volume fraction, a compression failure mechanism is combined, a density-related failure criterion is introduced, a nonlinear relation with the relative density is constructed through specific energy absorption data, material plasticity parameters are inversely optimized, and a defect coupling evaluation model is constructed according to the surface powder sticking rate and the pillar diameter deviation. And establishing a Gaussian mixture model based on a stress-strain curve to screen out abnormal data, and finally fusing the parameters to construct a data correction model. The dot matrix structure design precision can be improved, and then a high-quality data basis is provided for performance prediction-structure design two-way feedback.

The invention relates to the technical field of alloy steel, and particularly discloses high-strength and high-plasticity 3GPa-grade maraging steel and a preparation method thereof. The invention discloses high-strength and high-plasticity 3GPa-grade maraging steel, which is prepared from the following elements in percentage by weight: 15 to 20 percent of Ni, 0.1 to 2 percent of Al, 3 to 7 percent of Mo, 1.0 to 2.0 percent of Ti, 12 to 16 percent of Co and the balance of Fe and inevitable impurities. According to the maraging type ultrahigh-strength steel, by reasonably adding the elements and the proportion thereof and combining the forging process that the forging ratio and the forging temperature are reasonably adjusted and controlled, the maraging type ultrahigh-strength steel with the tensile strength of 3 GPa or above and the excellent plasticity is obtained.

The invention provides low-temperature rolled high-quality free-cutting steel and a production process thereof. The low-temperature rolled high-quality free-cutting steel comprises the following components: less than or equal to 0.10% of C, less than or equal to 0.006% of Si, 0.90-1.60% of Mn, 0.30-0.90% of P, 0.30-0.50% of S, less than or equal to 0.030% of Al, less than or equal to 0.0060% of N, less than or equal to 0.0140% of O and the balance of Fe and other inevitable impurities. Compared with the prior art, by controlling Mn / S to be 3.5-7.0, when the K value is equal to 2 * (Mn / S) + LF activity oxygen value, and K is larger than or equal to 35 and smaller than or equal to 69, the final sulfide is properly controlled. Low-temperature rolling is adopted, the sulfide hot brittleness interval is avoided, the plasticity of sulfide is relatively poor during rolling in the temperature interval, energy consumption is reduced, and meanwhile the phenomenon that the cutting performance of a finished product becomes poor due to the fact that the sulfide is lengthened in the rolling process is avoided. Finally, the high-quality free-cutting steel production process adopting low-temperature rolling is developed.

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 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.

The invention discloses preheating-free welding maritime work steel with excellent low-temperature toughness and a preparation method of the preheating-free welding maritime work steel, and belongs to the field of steel and iron material preparation. The produced steel plate has good comprehensive mechanical properties through alloy component-secondary rolling-controlled cooling process coupling design, the problem that the strength, plasticity, low-temperature toughness and preheating-free post-welding performance of the steel plate are difficult to match and harmonize is solved, the steel plate has ultrahigh-strength plasticity, excellent low-temperature toughness and excellent Z-direction performance, and room-temperature preheating-free welding can be achieved.

The invention discloses a forging method for improving plasticity of a large invar alloy steel ingot and invar alloy, and the forging method comprises the following steps: smelting molten steel by adopting an electric furnace, and casting to obtain the large invar alloy steel ingot with the weight of 15-25t; the cold-state invar alloy steel ingot is heated to 1000-1200 DEG C for heat preservation, and the heat preservation time is controlled to be longer than or equal to 10 h; the heated invar alloy steel ingot is subjected to three-heating-number upsetting and drawing-out, upsetting is conducted according to the rolling reduction of 15-50% of the total height of the invar alloy steel ingot in each heating number, the invar alloy steel ingot is drawn out to the height of the original invar alloy steel ingot after upsetting, and the invar alloy steel ingot is returned to a heating furnace to be heated and subjected to heat preservation after upsetting and drawing-out in each heating number; the final forging temperature of the last heating number is greater than or equal to 750 DEG C; and the invar alloy steel ingot subjected to heating and heat preservation in the last heating number is forged to the specified size, and then the invar alloy steel ingot is slowly cooled to the room temperature in air to obtain an invar alloy steel forging stock. The thermoplasticity of the large invar alloy steel ingot is improved, and the technical problem that the large invar alloy steel ingot is prone to cracking during forging is solved.

The invention discloses a double-guide-column plastic material forming machine. The die comprises a supporting base, a lower die base arranged on the supporting base, an upper die base capable of moving in a reciprocating mode relative to the lower die base, a driving supporting base arranged on the rear portion of the supporting base and a guiding supporting base vertically arranged on the driving supporting base, and a driving lead screw is arranged on the driving supporting base. Two guide rods parallel to the driving lead screw are arranged between the top of the guide supporting base and the supporting base, the upper die base is installed with the driving lead screw and the two guide rods in a matched mode, and a die pressing plate matched with the lower die base is fixedly installed on the upper die base. The mold pressing plate can reciprocate relative to the lower mold base through lifting of the upper mold base so as to press a blank. The device has the advantages that the action reliability and stability are good in the pressing process, and the pressing quality is greatly improved. And the parallelism of the guide rod and the screw rod is ensured, so that the pressing quality is greatly improved. The device is easy to manufacture, low in manufacturing cost, convenient to operate and use and high in use efficiency.

The cold heading wire rod comprises the following components in percentage by mass: 0.20%-0.26% of C, less than or equal to 0.35% of Si, 1.2%-1.6% of Mn, less than or equal to 0.02% of P, less than or equal to 0.005% of S, 0.04%-0.14% of V, 0.02%-0.10% of Nb, less than or equal to 0.2% of Cr, less than or equal to 0.1% of Ni, 0.02%-0.06% of Al and the balance of Fe and inevitable impurities, the V + Nb is greater than or equal to 0.09%, the C / 4 + Si + Mn / 2 + Cr / 2 + 2Ni is greater than or equal to 1.1% and less than or equal to 1.3%, the F + P is greater than or equal to 95%, the F grain size is greater than or equal to grade 12, the longitudinal pearlite strip The steel plate prepared by the method does not crack at 1 / 5 of a hot rolling state, can meet the requirements of a user on strength and plasticity of cold heading forming after 5-50% of cold drawing deformation, and can meet the requirements of a 10.9-grade high-strength fastener on fatigue and delayed fracture resistance at the same time.

The invention is applicable to the technical field of titanium alloy pipe processing, and particularly relates to a preparation method of a high-plasticity TA15 titanium alloy pipe, which comprises the following steps: step S1, selecting sponge titanium, pure metal and intermediate alloy, preparing according to standard components of TA15 titanium alloy to obtain a prepared raw material, and smelting the prepared raw material for three times by adopting a vacuum consumable smelting furnace to obtain a high-plasticity TA15 titanium alloy pipe; and the TA15 titanium alloy cast ingot with the diameter being 600 mm is obtained. According to the method, the mechanical property and plasticity of the titanium alloy pipe are remarkably improved by accurately controlling the temperature and deformation of each machining step. And three-time upsetting and three-time drawing forging is carried out within the temperature range of T beta or above, coarse grains are effectively crushed, and grain structures are refined. And then, the metallographic structure of the wool rod is gradually optimized by accurately controlling the forging temperature and the deformation amount.

The invention discloses a dissimilar metal friction welding interface regulation and control layer and an aluminum steel friction welding method. The dissimilar metal friction welding interface regulation and control layer comprises a micro-texture arranged on the metal surface, paste is laid at the micro-texture, and non-metal substances in the paste are completely volatilized before dissimilar metal metallurgical bonding; the welding method comprises the steps that a microstructure is prepared in a designated area on the surface of a stainless steel plate, Zn-20Al powder and ethyl alcohol are mixed and stirred into paste, then the paste is evenly laid on the microstructure area on the surface of base metal, and then friction stir welding is conducted. A welding joint obtained through the scheme is good in toughness (plasticity) and high in strength, atomic-level tight combination of a joint interface is achieved, the mechanical property of the joint is excellent, the joint is free of air hole and crack defects, the adverse effect of brittle intermetallic compounds on the mechanical property is weakened, the wetting spreading performance and the element diffusion capacity of the interface are enhanced, and the welding quality is improved. The obtained welding joint has a good mechanical embedding characteristic.

The invention provides low-cost 1500MPa-grade hot-rolled high-strength steel and a preparation method, and relates to the technical field of hot-rolled high-strength steel. The thickness of the low-cost 1500MPa-grade hot-rolled high-strength steel is 4-8mm, and the low-cost 1500MPa-grade hot-rolled high-strength steel comprises the following chemical components in percentage by mass: 0.20-0.24% of C, 2.4-2.8% of Mn, 1.4-1.8% of Al, 0.3-0.4% of Si, less than or equal to 0.01% of P, less than or equal to 0.01% of S and the balance of Fe and inevitable impurity elements. The preparation method comprises the steps of raw material weighing, continuous casting, heat treatment, hot rolling and critical annealing. According to the invention, by creatively selecting alloy elements and adjusting the content, combining hot rolling and critical annealing treatment and controlling the air cooling rate, the comprehensive properties such as strength, plasticity and impact resistance of the steel plate are synergistically improved; the method is high in resource utilization rate, low in production cost, short in process, easy to operate, high in efficiency and beneficial to industrial large-scale production and popularization.

The invention provides a high-damping titanium alloy with a wide temperature range at a high temperature and a preparation method thereof. The titanium alloy is prepared from the following elements in percentage by mass: 3.4 to 5.2 percent of Al, 2.8 to 4.4 percent of Cr, 2.6 to 4.5 percent of Mo, 0.7 to 1.5 percent of Zr, 0.17 to 0.41 percent of O and the balance of Ti. The preparation method of the alloy comprises the following steps: (1) cast ingot smelting; (2) homogenization treatment; (3) beta forging treatment; (4) near beta forging treatment; (5) rolling treatment; and (6) annealing treatment. The method is reasonable in conception, the functional characteristics of wide temperature range and high damping can be obtained at high temperature, the mechanical properties of high strength and high plasticity are achieved, meanwhile, the preparation difficulty of the material is reduced in combination with a traditional titanium alloy machining method, and the method is suitable for large-scale production, popularization and application.

The invention discloses an isomeric low-alloy high-strength steel structure electric arc additive manufacturing process, and relates to the technical field of electric arc additive manufacturing, the isomeric low-alloy high-strength steel structure electric arc additive manufacturing process comprises the following steps: carrying out heat treatment and tensile test on a low-alloy high-strength steel wire to obtain test data, and establishing a process parameter-performance prediction model according to the test data; obtaining a performance demand of a target structural member, and drawing up a process parameter by using a process parameter-performance prediction model according to the performance demand; an electric arc additive manufacturing system is used for conducting electric arc additive manufacturing on the low-alloy high-strength steel wire, and a low-alloy high-strength steel structural part is obtained; acquiring temperature information of the low-alloy high-strength steel structural member by using an infrared thermal imager, and adjusting the process parameters in real time according to the temperature information to obtain a target structural member; gradient distribution of precipitation strengthening phases is achieved, isomerism of alloy element in-situ strengthening low-alloy high-strength steel materials is achieved, and the diversified requirements of target structural parts for different strengths and plasticity are met.

The invention belongs to the technical field of alloy steel, and relates to composite reinforced high-toughness steel and a preparation method thereof. The steel comprises the following chemical components in percentage by weight: 6.0%-9.4% of Ni, 7.6%-8.9% of Co, 0.8%-3.8% of Cr, 1.0%-2.6% of Mo, 0-0.9% of W, 0.05%-0.60% of V, 0-0.10% of Nb and the balance of Fe. C and Al are added to serve as strengthening elements, and the balance is Fe and impurity elements. When 0.14% < = C < 0.20%, 1.2% < = Al < = 1.6%, 1.0% < = Mo + W / 2 < = 2.0%; when 0.20% < = C < = 0.35%, 0.6% < = Al < = 1.3%, and 2.0% < = Mo + W / 2 < = 3.0%. The alloy is subjected to vacuum induction melting or multi-time melting, homogenizing diffusion annealing and forging rolling to form a material, so that the tensile strength of the steel reaches 2200-2350 MPa or above, the yield strength reaches 2000-2150 MPa or above, and the steel has excellent strength, plasticity and toughness matching and can be used for components such as engine shafts, aircraft landing gears, high-performance shells, frame beams and molds.

The invention relates to a hot-rolled wire rod for a 2400 MPa bridge cable and a manufacturing method of the hot-rolled wire rod, after high-carbon components of Cr-Mo-V are rolled and spun into a wire rod, the wire rod is subjected to online molten salt rapid cooling isothermal treatment, so that the wire rod is cooled at the cooling speed of more than or equal to 32 DEG C / s and enters a sorbite phase region from an austenite state to form a structure taking sorbite as a main part, and precipitation and growth of carbides are controlled; and finally, roller way slow cooling is conducted, the hot-rolled wire rod with the microscopic structure comprising a mixed structure composed of tempered sorbite, ferrite and fused pearlite is prepared, the strength and plasticity matching performance of the wire rod can be improved, the mechanical property fluctuation can be reduced, the tensile strength can reach 1640-1680 MPa, the percentage reduction of area can reach 27%-32%, the mechanical property same-circle difference is smaller than or equal to 45 MPa, and the tensile strength of the wire rod can reach 1640-1680 MPa, the percentage reduction of area can reach 27%-32%, and the mechanical property same-circle difference is smaller than or equal to 45 MPa. And rapid and stable production is facilitated, the method is used for manufacturing the 2400 MPa bridge cable, and the wire breaking risk can be reduced easily.

The invention relates to the technical field of metal processing, in particular to a zirconium alloy plate texture control method for regulating recrystallization based on cold rolling deformation. The zirconium alloy hot-rolled plate blank is subjected to annealing treatment, so that an equiaxial grain structure with the proper size is obtained; cold rolling treatment is conducted on the zirconium alloy plate blank obtained after annealing treatment, different rolling deformation accumulation modes are introduced through total deformation design, rolling pass control and pass deformation control, and different dislocation and subgrain distribution states are formed in the zirconium alloy cold-rolled plate; and the zirconium alloy plate strip prepared through cold rolling deformation is subjected to annealing treatment, so that a completely recrystallized plate with refined grains and weakened texture is obtained, and the plasticity and forming performance of the zirconium alloy plate are improved. The technological process is simple, the recrystallized zirconium alloy plate with the basal texture weakened can be obtained only by slightly changing the zirconium alloy plate machining technology, the anisotropy of the zirconium alloy plate can be reduced, and therefore the use performance of the zirconium alloy plate is improved.

The invention relates to the technical field of titanium alloy rolling processing, and discloses a method for inhibiting surface cracking in the rolling process of a high-strength titanium alloy thick plate, which comprises the following steps: selecting a titanium alloy plate blank, and preheating the plate blank; the preheated plate blank is subjected to surface multi-pass rolling treatment, and the roll gap set in the later-pass rolling treatment is smaller than that in the previous-pass rolling treatment; remelting and heating the plate blank, wherein the heating temperature is higher than the preheating temperature; the plate blank is discharged out of the furnace and subjected to multi-pass rolling, a rolled plate blank is obtained, and the rolling pass rolling reduction is controlled to range from 5 mm to 25 mm; and the rolled plate blank is straightened on line and then air-cooled to the room temperature. According to the method, the surface layer of the plate blank substrate is subjected to structure prefabrication, the surface plasticity is improved, the extensibility in the rolling process is improved, and generation of surface cracks is restrained.

The invention discloses a low-temperature titanium alloy material and a preparation method, the low-temperature titanium alloy material is an alpha + beta type two-phase titanium alloy, an alpha stable element (Al), a beta stable element (Mo / Nb / V) and a neutral element (Zr) are used as main composition elements, and the content (O) of interstitial elements is controlled. The influence mechanism of each component element on the low-temperature mechanical property and the low-temperature deformation mechanism is determined, so that the mass percentage content of each component and the interstitial element content are accurately controlled. On the basis, the low-temperature titanium alloy material involved in the invention can be used for manufacturing profiles or components in various forms, and low-temperature titanium alloy components in different forms can be manufactured by combining a numerical simulation technology optimization process scheme. The low-temperature mechanical properties of the low-temperature titanium alloy material under the condition of 20K can meet the requirements that the tensile strength Rm is larger than or equal to 1500MPa, the elongation A is larger than or equal to 12%, and the low-temperature strength and plasticity matching is excellent.

The invention discloses ultrafine heterostructure martensitic steel based on Mo segregation induction and a heat treatment process of the ultrafine heterostructure martensitic steel. The martensitic steel comprises the following chemical components in percentage by weight: 0.4-0.7% of C, 0.3-1.0% of Mn, 1.0-2.0% of Si, 0.2-1.5% of Cr, 0.01-3.5% of Ni, 0.2-0.8% of Mo, less than or equal to 0.03% of P, less than or equal to 0.03% of S and the balance of Fe. The method comprises the following steps: firstly, obtaining a pearlite type structure rich in Mo cementite through a normalizing or tempering process by utilizing the characteristic that Mo element is easily enriched in the cementite; then austenitizing treatment is conducted through a rapid heating technology by means of the characteristics that in the austenitizing process, the dissolving speed of molybdenum-rich cementite is low, and the diffusion speed of the Mo element is low, and a superfine austenite structure with the Mo element distributed unevenly is obtained, that is, a nanometer / submicron Mo-rich area exists in superfine austenite; and then quenching and tempering treatment are carried out, a tempered martensite structure with a superfine heterostructure is obtained, so that excellent strength and plasticity are obtained, the yield strength of the alloy can reach 2000-2500MPa, the tensile strength can reach 2100-2700MPa, and the ductility is 6-12%.

The invention discloses a high-strength high-temperature alloy and a preparation method thereof. The high-strength high-temperature alloy comprises a high-temperature alloy matrix and rare earth oxides dispersed and distributed in the high-temperature alloy matrix. The high-temperature alloy matrix is GH4169, and the high-temperature alloy matrix is made of The rare earth oxide is one or two of La2O3 and Ce2O3, the particle size of the rare earth oxide is 50-500nm, and the total adding amount of the rare earth oxide is 0.02-0.03% of the mass of the alloy; the preparation method of the high-strength high-temperature alloy comprises the following steps: (1) preparing rare earth oxide particles; (2) charging and smelting rare earth oxide particles and alloy raw materials in a vacuum induction furnace, and casting into ingots after the components are qualified; (3) electroslag remelting: adding analytically pure rare earth oxide into a slag system; and (4) the electroslag ingot is subjected to homogenization, forging and solid solution aging treatment, and then the alloy is obtained. According to the method, the strength and plasticity of the high-temperature alloy are improved.

This invention discloses a stainless steel welding wire for repair welding of martensitic stainless steel turbine runners, its preparation method, and its application, belonging to the field of metal welding material preparation technology. The chemical composition of the welding wire provided by this invention, expressed as a percentage by weight, is: C≤0.03%, Si: 0%~0.6%, Mn: 5.0%~8.0%, S≤0.010%, P≤0.020%, Cr: 12.5%~15.5%, Ni: 5.0%~7.0%, Mo: 1.0%~2.0%, with the balance being Fe and impurities. The welding wire provided by this invention is suitable for repair welding of Cr13Ni4~6 type martensitic stainless steel, and post-weld heat treatment is not required. The weld metal produced by this welding wire exhibits good strength, plasticity, and toughness, with a tensile strength ≥750MPa, elongation after fracture ≥35%, and impact absorption energy at -40℃ ≥120J.

The invention provides a 10.9-grade non-quenched and tempered cold heading steel wire rod and a production method thereof. The 10.9-grade non-quenched and tempered cold heading steel wire rod comprises the following chemical components: 0.23-0.27% of C, 0.30-0.50% of Si, 1.45-1.55% of Mn, less than or equal to 0.025% of P, less than or equal to 0.025% of S, 0.40-0.50% of Cr, 0.025-0.050% of Ti, 0.0025-0.0050% of B, less than or equal to 0.0050% of N and more than or equal to 0.015% of [Ti]-3.5 * [N]. According to the invention, on the basis of component design, a controlled rolling process deformation induced phase change, an online salt bath isothermal treatment cooling process and an artificial aging process are matched, so that rapid cooling and isothermal phase change of the wire rod are realized, and the prepared wire rod is uniform in through ring mechanical property, high in yield ratio, good in plasticity and long in fatigue life. The steel wire rod can be used for directly cold-drawing the steel wire without annealing, and the cold-drawn steel wire can meet the performance requirement of a 10.9-grade fastener without quenching and tempering after being formed. According to the production method of the wire rod, the production process can be simplified, the fastener production period is shortened, the cost is reduced, meanwhile, the energy consumption is reduced, and the method conforms to the current green and low-carbon development route.

The invention provides a high-precision spinning forming process method for a ribbed cylinder section, and aims to solve the problems of diameter expansion, unevenness in deformation and the like in the traditional spinning process. The process comprises the following steps: performing double-sided turning on a prefabricated cylinder blank to ensure the inclination, mounting a spinning mold with a rib structure, heating the cylinder blank, and sleeving the heated cylinder blank on a mold with an inner cross groove to realize interference fit. And then, a three-spinning-roller spinning machine is started for spinning, the plasticity of the material is improved through induction heating, and the material flows into a cross groove of the mold. And after spinning is completed, the spinning roller is replaced with a turning tool, the outer surface is turned, and finally the part is taken out. According to the method, the inner diameter is controlled through material thermal expansion coefficient difference and diameter compensation, and boundary dimension homogenization is achieved through the induction heating and in-situ turning technology. The process is suitable for materials such as aluminum alloy and high-strength steel, the size precision of the cylinder section is remarkably improved, and technical support is provided for overall near-net forming of aircraft cylinder sections such as tactical projectiles. The spinning process is optimized, and the quality and performance of a final product are improved.

The invention belongs to the technical field of nodular cast iron manufacturing, and relates to low-temperature nodular cast iron and a preparation method and application thereof.The low-temperature nodular cast iron has the CEL of 4.25-4.3 and comprises, by mass, 3.4%-4.0% of C, 1.8%-2.3% of Si, smaller than or equal to 0.2% of Mn, smaller than or equal to 0.02% of S, smaller than or equal to 0.03% of P, 1.2%-1.6% of Ni and the balance Fe. The preparation method comprises the steps of raw material selection, burdening, smelting, spheroidizing inoculation, pouring and the like. Under the as-cast condition of the low-temperature nodular cast iron, at the normal temperature and the temperature as low as-40 DEG C, the tensile strength sigma b is larger than or equal to 450 MPa, the elongation is larger than or equal to 10%, and the average impact absorbing energy AKV of a sample with a V-shaped notch is larger than or equal to 10 J. According to the low-temperature nodular cast iron, the production cost of materials can be reduced, and the application range and application field of the low-temperature nodular cast iron can be widened; the application problem that the composite material needs to be applied in a low-temperature environment and needs parts with high strength and high plasticity and toughness is solved.

The invention provides an Al-Mn series aluminum alloy as well as a preparation method and application thereof. The Al-Mn series aluminum alloy contains an Al < x > Cu < y > nano strengthening phase and an Al Fe < Si > dispersed phase, the solid solubility of Mn in the Al-Mn alloy is less than or equal to 0.4 wt%; and the atomic number ratio x: y of Al to Cu in the Al < x > Cu < y > nano strengthening phase is 2: 1-4: 1. The preparation method comprises the following steps: (1) burdening according to the components and the weight percentage to obtain a mixed material; (2) smelting and casting the mixed material prepared in the step (1) in sequence to obtain an aluminum ingot; (3) the aluminum ingot obtained in the step (2) is subjected to homogenization treatment for 8-15 h at the temperature of 500-600 DEG C, an AlMnSiFe phase is separated out, and a homogenized sample is obtained; and (4) the homogenized sample obtained in the step (3) is sequentially subjected to first hot rolling, cold rolling, first annealing, second hot rolling and second annealing, so that an AlxCuy nanometer strengthening phase is formed, and the Al-Mn series aluminum alloy is obtained. The Al-Mn series aluminum alloy provided by the invention is excellent in plasticity, high in strength and wide in application prospect.