3263 results about "Plasticity" patented technology

The invention relates to Ti microalloyed ultra-fine grained cold rolling dual-phase steel of a 1,000MPa level and a preparation method thereof, belonging to the technical field of cold rolling ultra-high strength steel for automobiles. The steel comprises the following chemical compositions in percentage by weight: 0.03-0.20 percent of C, 0.20-0.80 percent of Si, 1.2-2.0 percent of Mn, 0.03-0.15 percent of Ti, less than 0.15 percent of S, less than 0.020 percent of P, 0.02-0.15 percent of Als and the balance of Fe. In the invention, C-Si-Mn-Ti is used as a basic alloy system, low-price Ti is adopted, and alloy elements such as Cr, Mo, Nb, V, and the like are not added, thereby reducing the production cost; through a flexible continuous annealing process, the size of a martensite island can be controlled to be 1-2 micrometers or increased to about 5 micrometers under the condition that the quick cooling speed is lower than 50 DEG C/s in continuous annealing so as to obtain the following three different types of dual-phase steel: a high strength type (Rm is 980-1,200MPa, and A50 is 10-13 percent), a high plasticity type (Rm is 980-1,100MPa, and A50 is 14-18 percent) and a synthesizing type (Rm is 980-1,150MPa, and A50 is 12-15 percent); and the yield ratio is 0.47-0.65.

The invention discloses microalloyed steel used for an axle of a railway freight car, wherein the microalloyed steel contains the following chemical components by weight: 0.50-0.57 percent of C, 0.17-0.40 percent of Si, 0.60-1.00 percent of Mn, 0.20-0.35 percent of Cr, 0.18-0.40 percent of Ni, 0.08-0.18 percent of Mo, 0.02-0.06 percent of Al, 0.020-0.060 percent of Ti, 0.030-0.10 percent of V, less than or equal to 0.010 percent of S, less than or equal to 0.020 percent of P, less than or equal to 0.005 percent of B, less than or equal to 0. 20 percent of Cu, less than or equal to 0.010 percent of Sb, less than or equal to 0.03 percent of Sn, less than or equal to 0.04 percent of As, less than or equal to 0.0015 percent of [O] and less than or equal to 0.0060 percent of [N], and the rest is Fe. The invention has high strength, good plasticity, good low-temperature impact property and good crack-resistance sensitivity.

The invention discloses high strength Al-Mg-Sc alloy powder, and a preparation method, application and 3D printing method thereof. The specific combination of the alloy powder has multiple strengthening mechanisms of nanometer precipitation strengthening, fine grain strengthening, solid solution strengthening and the like, and high strength and plasticity are achieved. The rare earth high strengthAl-Mg-Sc alloy powder is subjected to 3D printing, parts are free of cracks, the compactness degree is high, the tensile strength and the elongation percentage are far higher than those of AL-12Si and AlSi10Mg alloys for traditional 3D printing, and the problems that a traditional aluminum alloy is low in 3D printing strength and poor in elongation percentage, and the stretching performance and the elongation percentage cannot be improved at the same time are solved. The tensile strength of the parts formed by printing the high strength Al-Mg-Sc alloy powder can reach 523 MPa or above, and the elongation percentage can exceed 13%.

The invention provides a hot-rolled high-strength steel sheet for static enameling and a manufacturing method for the steel sheet. The main components by weight of the steel sheet are: C: 0.02-0.1%, Si<=0.1%, Mn: 0.2-1.5%, P: <=0.035%, S<=0.035%, Al: 0.01-0.1%, N: 0.001-0.01%, Ti: 0.01-0.1 %, Nb: 0.001-0.1%, and the remainder are iron and unavoidable foreign matters. The structure of the steel sheet comprises ferrite and pearlite, an the average particle diameter of the ferrite is not more than 11 micrometer. The manufacturing method of the steel sheet is, rolling twice the continuously cast or steel blanks after heating to 1100-1250 DEG C with total pressure-down amount <=50%, and final rolling temperature >=800 DEG C, then cooling section by section to coiling temperature 550-700 DEG C, and finally leveling the sheet. The hot-rolled high-strength steel sheet is applicable for pressure vessels such as bladders of water heaters, liquid-storing tanks and water buckets, etc. that are manufactured by static enameling process, is of high strength and good plasticity, high resistance to scaling bursting and air tightness.

The invention relates to steel for ocean engineering and a manufacturing method thereof, in particular to a steel plate with a thickness of 80mm and a low compression ratio for ocean engineering and a manufacturing method thereof. The steel plate comprises the chemical components with the weight percentages as follows: 0.12 to 0.16 percent of C, 0.20 to 0.40 percent of Si, 1.20 to 1.60 percent ofMn, smaller than or equal to 0.010 percent of P, smaller than or equal to 0.003 percent of S, 0.025 to 0.050 percent of Nb, 0.030 to 0.050 percent of V, 0.010 to 0.020 percent of Ti, smaller than or equal to 0.20 percent of Cr, 0.10 to 0.40 percent of Ni, smaller than or equal to 0.20 percent of Cu, smaller than or equal to 0.08 percent of Mo, 0.0250 to 0.050 percent of Al, smaller than or equal to 20ppm of O, smaller than or equal to 40ppm of N, smaller than or equal to 3ppm of H, and the remaining amount of Fe and inevitable impurities. A controlled rolling and cooling technology is adopted, the heating temperature before rolling is 1180 DEG C to 1250 DEG C, the rough rolling temperature is 1000 to 1100 DEG C, and the finish rolling starting temperature is 850 to 880 DEG C; laminar cooling is conducted after the rolling, the final cooling temperature is 640 to 680 DEG C, and the cooling rate is 5 to 15 DEG C/s; and normalizing treatment is conducted, the normalizing temperature is 890 to 910 DEG C, the heating rate is 1.4min/mm, and the heat preservation time is 50 to 90min. The obtained steel has the characteristics of high strength, good Z-direction lamellar tearing resistant performance, high plasticity, and the like.

The invention provides a heat treatment method for high-strength and toughness hot-formed steel plates for automobiles, which belongs to the technical field of high-strength steels for automobiles, and aims to solve the problems of high strength but poor plasticity of steel plates for hot-formation at present. Technical measures to solve the problem: the mass percentage of the components is: C: 0.2~0.4%, Si: 0.1-0.5%, Mn: 1.0~2.0%, Cr: 0.1~0.5%, B: 0.001-0.005%, Ti : 0.01~0.05%, Al: 0.01-0.1%, P: <0.02%, S: <0.01%, N: <0.01%, and the balance is iron and unavoidable impurities. In the range of ~500℃, tempering treatment is carried out for 1-5min. The invention has the advantages that after the tempering treatment, the plasticity of the hot-formed steel is significantly improved while the strength is slightly reduced, and the toughness of the steel plate after hot stamping is improved.

The invention relates to a method for preparing a magnesium alloy section through continuous angle rotation shearing, extrusion and shaping and a mould. The method comprises the following steps: (1) a magnesium alloy blank material is subjected to homogenization treatment; (2) a mould of an extrusion mould with a plurality of angle rotation and molding is preheated; and the inside of a mould passage is evenly coated with lube; (3) an extrusion cylinder is heated to a temperature of between 175 and 325 DEG C; and (4) the homogenized blank material is heated to a temperature of between 200 and 350 DEG C; the extrusion ratio of the extrusion mould is between 4 and 100; and the magnesium alloy blank material is subjected to unidirectional extrusion at an extrusion speed of between 3 and 6 m/min so that the magnesium alloy blank material is subjected to compression and extrusion with high extrusion ratio and equal passage extrusion with a plurality of angle rotation. The magnesium alloy material prepared through the method has an ultrafine crystal grain structure, has the advantages of substantially improving the plasticity, low temperature superplasticity and high strain speed of the magnesium alloy material and has high yield stress.

The invention relates to a lanthanon Y which is utilized to strengthen magnesium alloy effectively and a preparation technology thereof, in particular to a quasicrystal phase which is utilized to strengthen Mg-Zn-Y-Zr magnesium alloy and a preparation method thereof, and the problems such as magnesium alloy strengthening, etc. are solved. On the premise of definite Y contents, the volume percentage of the quasicrystal phase which is led into a magnesium alloy matrix to reach the maximum through reasonably choosing the rate between Zn and Y in the alloy (the rate between Zn and Y ranges from 6 to 15), so as to prepare the Mg-Zn-Y-Zr magnesium alloy with low density, high strength and better plasticity. The magnesium alloy material has the components and the contents thereof as follows: the content of zinc (Zn) ranges from 5 to 30 percent; the content of yttrium (Y) ranges from 0.5 to 5 percent; the content of zirconium (Zr) ranges from 0.3 to 0.8 percent, and the others are magnesium (Mg); all the percentage are weight percentage. The magnesium alloy material are processed through alloy melting and subsequent hot extrusion processing and deformed into products, and the operation of the processing technology is simple and convenient. The tensile strength of the material satisfies that Sigma (b) ranges from 290 to 360MPa, the yield stress delta0.2 ranges from 175 to 260MPa, the unit extension Delta ranges from 10 to 18 percent, and the density is 1.84 to 2.73g/cm<3>.

The invention discloses a titanium alloy with high strength, high plasticity and good fracture toughness and a preparing technology of the titanium alloy and belongs to the technical field of the material science. The titanium alloy includes, by weight percent, 2.5%-6.0% of Al, 6.5%-8.5% of Mo, 0%-3.0% of V, 1.5%-4.5% of Cr, 0.7%-2.0% of Fe, 0%-2.5% of Zr, 0.05%-0.2% of O and the balance Ti and inevitable impurities. The titanium alloy with the component feature is subjected to proper deformation and heat treatment, and therefore the titanium alloy with the tensile strength being 1450 MPa or above, the ductility being not smaller than 5% and the fracture toughness being not smaller than the value (please see the value in the specification) can be obtained, good toughness performance is achieved, and the titanium alloy is suitable for being applied to structural parts which work under the room temperature and have the requirements for high strength and good fracture toughness.

The invention relates to the technical field of metal material deformation heat treatment processes and discloses a process method for improving the comprehensive mechanical property of a 2219 aluminum alloy ring piece so that coarse residual crystalline phases of the large-size 2219 aluminum alloy ring piece can be fully crushed and crystalline grains can be refined and equiaxed, thus, the strength and the plasticity of the 2219 aluminum alloy ring piece are improved at the same time, and the anisotropy is decreased. The process method comprises the steps of multi-directional forging, punching, mandrel supporter broaching, piecewise rolling and heat treatment. In the multi-directional forging step, the heating temperature of a blank is 500 DEG C-520 DEG C, and the final forging temperature is higher than or equal to 380 DEG C. Piecewise rolling comprises the steps that in the first stage, the ring blank is heated to 420 DEG C-460 DEG C and subjected to hot rolling on a ring rolling machine, and the hot rolling deformation quantity is 30%-40%; and in the second stage, the ring piece subjected to hot rolling is air-cooled to 240 DEG C-280 DEG C and is continuously subjected to medium and low temperature rolling on the ring rolling machine, and the deformation quantity is 15%-25%.

The invention discloses a 100-150mm alloy structural steel 4140 thick plate and a production technique thereof. The 100-150mm alloy structural steel 4140 thick plate comprises the following chemical components in percentage by mass: 0.39-0.42% of C, 0.20-0.30% of Si, 0.85-0.95% of Mn, at most 0.010% of P, at most 0.003% of S, 0.020-0.040% of Als, 0.9-1.0% of Cr, 0.17-0.23% of Mo, and the balance of Fe and residual elements. KR molten iron pretreatment, converter smelting, argon blowing, LF (ladle furnace) refining, VD (vacuum degasser) refining, die casting, steel ingot slow cooling, steel ingot conditioning, heating, controlled rolling, cooling in pile, heat treatment and slow cooling are utilized to strictly control the contents of P, S and other harmful elements capable of influencing the plasticity and toughness of the steel plate, thereby ensuring the minimized internal residual stress of the 4140-grade 100-150mm-thick steel plate; and the internal quality is acceptable, and various performance indexes satisfy the standard requirements. The reasonable quenching and tempering technique is utilized to ensure that various properties of the 4140 steel plate satisfy the requirements.