98 results about "Ausforming" patented technology

The invention belongs to the field of precipitation strengthened austenitic heat-resistance steel and relates to a method for increasing the proportion of special grain boundaries in the precipitation strengthened austenitic heat-resistance steel. An optimization treatment process includes solid solution, cold rolling and annealing. The method is characterized in that solution treatment is performed at the temperature from 1150 DEG C to 1300 DEG C for 20 min to 60 min; indoor temperature rolling with the deformation ranging from 20% to 60% is then performed, the single pass reduction is not lower than 15%, and then at the temperature from 1100 DEG C to 1250 DEG C, periodical short-time annealing and water cooling are performed. After optimization treatment is performed, the special grain boundaries in a microscopic structure of the precipitation strengthened austenitic heat-resistance steel are evenly distributed, and the proportion is higher than 80%. By the adoption of the method, the strain storage energy is improved by increasing the indoor temperature deformation, recrystallization is promoted to occur in precipitation strengthened austenitic steel, the proportion of the special grain boundaries in the precipitation strengthened high-Cr and high-Ni austenitic heat-resistance steel is increased, the performance of the steel related to the grain boundaries is optimized, and corrosion resistance and irradiation swelling resistance are particularly optimized.

The invention discloses steel with good property and ultra-high strength for engineering machinery and a manufacturing method thereof. The steel comprises the following components by weight percent: 0.15 to 0.20 percent of C, 0.35 to 0.55 percent of Si, 0.95 to 1.35 percent of Mn, at most 0.013 percent of P, at most 0.0030 percent of S, 0.75 to 1.25 percent of Cr, 0.45 to 0.65 percent of Mo, 0.0010 to 0.0020 percent of B, 0.005 to 0.013 percent of Ti, 0.010 to 0.030 percent of Nb, 0.030 to 0.070 percent of Al, at most 0.0060 percent of N, at most 0.0030 percent of O, 0.001 to 0.004 percent of Ca, and Fe and inevitable impurities in balance. The invention optimizes the DQ and offline tempering process, adopts the ausforming process, ensures that the microscopic structure of finished steel plates becomes fine low-carbon tempered martensite and the average colony size is smaller than 20 micrometers, obtains ultra-high strength steel plates with good low-temperature flexibility, weldability and anti-delay cracks, solves the problem of overquenching of superficial layers of the ultra-high strength steel plates, and is particularly applicable to equipment manufacturing industries of large-scale engineering machinery and the like.

The invention discloses a production technique of a high-damage-resistance aluminum alloy plate. The aluminum alloy comprises the following elements in percentage by mass: 3.2-3.6% of Cu, 1.1-1.4% of Mg, 0.6-0.9% of Mn, 0.4-0.8% of Zr, 0.3-0.6% of Mo, 0.15-0.25% of Li, 0.1-0.2% of Ga, 0.05-0.15% of Co, 0.04-0.07% of Fe, 0.03-0.05% of Si, 0.06-0.12% of Er, 0.04-0.08% of Sc and the balance of Al. On the basis of lowering the Fe/Si ratio and Cu content, Zr, Er, Sc, Li and other elements are added for microalloying to reduce the solidified eutectic phase and heat treatment excess phase and reduce the fatigue crack generation probability; the microalloying forms a disperse phase coherent with the base to keep the deformation recovery subgrain structure; and the thermomechanical treatment improves the distribution uniformity of the precipitated phase to effectively enhance the fatigue crack propagation resistance, thereby greatly enhancing the damage resistance of the existing aluminum alloy material on the premise of ensuring the strength and toughness of the aluminum alloy material.

The invention discloses a method for locally softening an automotive thermal forming part. The method can be realized through the following manners: 1, controlling the temperature of sheet matal at different areas at the sheet matal heating phase of thermal forming technology; 2, controlling the temperature of inserts at different areas of a die at the die assembling phase of the thermal forming technology; 3, controlling the cooling rate of sheet matal at different areas at the die assembling phase of the thermal forming technology; and 4, after the thermal forming technology is finished, locally heating the thermal forming part for the second time. With adoption of the method, one thermal forming part has different mechanical properties at different areas, and the performance of the part in a vehicle crash test is optimized. The high-strength part of the performance-variable thermal forming part is mainly quenched martensite, and the tensile strength is equal to or greater than 1300 Mpa; and the low-strength part of the performance-variable thermal forming part is formed by one or combination of ferrite, pearlite, bainite and tempered martensite, and the tensile strength is equal to or less than 1000 Mpa.

The invention discloses a method for preparing an aluminum lithium alloy superplastic plate. The process route of the method comprises the following steps: carrying out solid solution on a raw material, namely a 2A97 aluminum lithium alloy plate blank with certain initial thickness at 460-540 DEG C for 0.5-4 hours, carrying out water quenching, and then carrying out heat preservation at 400 DEG C for 8-48 hours; then rolling an alloy to 1.0-4.0 mm. Compared with the traditional thermomechanical treatment method, the method disclosed by the invention can be used for effectively solving the problem of easiness for cracking of a large-sized plate during rolling by increasing the intermediate annealing temperature, enhancing the deformation stored energy of the alloy and solving the problem of low superplastic elongation percentage of a plate by changing the traditional warm rolling process into a cold rolling process by retaining 20%-30% of deformation amount and can be used for firstly preparing the 2A97 aluminum lithium alloy large-sized superplastic plate with good superplastic property.

The invention relates to a method for simultaneously improving the strength and electric conductivity of a Cu-Cr-Nb alloy. The alloy comprises the components with percent by weight: 0.5-5.0% of Cr, 0.5-5.0% of Nb, 0.01-1.00% of M and the balance copper, wherein M is at least three components selected from RE, B, P, Si, Ca, Zr, Li, Mg, Ti, Ni, Fe, Sn and Mn; and RE is at least one component selected from Ce, La, Y, Pr, Nd, Sm and Sc. The Cu-Cr-Nb-M alloy is prepared through powder formation and thermo-mechanical treatment. Under the combined action of microalloying, rapid solidification, rapiddensification and the thermo-mechanical treatment, the microscopic structure of the alloy is regulated; and under the synergistic action of various strengthening mechanisms, the strength of the alloyis improved, and the comprehensive performance of the alloy is improved. The size of the second phase in the alloy prepared by using the method is smaller than or equal to 0.50 micrometer; the secondphase is uniformly distributed; the room-temperature tensile strength of the alloy is equal to or higher than 450 Mpa; and the electric conductivity is equal to or higher than 80% IACS. The tensile strength is equal to or higher than 95 MPa at the high temperature of 700 DEG C; and it is achieved that the electric conductivity and the strength of the Cu-Cr-Nb alloy are simultaneously improved andwell matched.

The invention discloses an ausforming method capable of improving the mechanical property of an aluminum alloy rolled plate. The ausforming method particularly comprises the following steps of (1) solution treatment, (2) preaging, (3) deep cooling rolling and (4) warm rolling. Compared with a traditional 6000 series aluminum alloy deep cooling rolled state plate, the intensity and plasticity of the aluminum alloy rolled plate machined by the ausforming method are improved significantly. Compared with a traditional peak-aging state plate, the intensity of the aluminum alloy rolled plate machined by the ausforming method is improved substantially and the aluminum alloy rolled plate and the traditional peak-aging state plate have similar plasticity. With the adoption of the ausforming method,the processes are simple, the cycle is short, the energy consumption is low, and the ausforming method has very high potential applications and value in industrial production.

The invention discloses a thermo-mechanical treatment strengthening technology of a magnesium alloy sheet. The magnesium alloy sheet adopts an AZ81-series magnesium alloy sheet, and the thermo-mechanical treatment strengthening technology of the magnesium alloy sheet comprises steps as follows: the well-polished magnesium alloy sheet with the size of (40*40*40) mm is subjected to solution treatment, the heating temperature is 415 DEG C, and the heat preservation is performed for 20 hours; the magnesium alloy sheet is heated again to a range of 150-160 DEG C for rolling, and the deformation amount is 15%; and then the aging treatment is performed, the technological parameters include that the heating temperature is 168 DEG C and the heat preservation time is 8-16 hours, and the air cooling is performed to the room temperature. After the technological treatment, compared with the conventional heat treatment technology, mechanical properties of the alloy are improved, that is, the tensile strength sigma b of the alloy at the room temperature is improved by 15.5%-18.2%, and the hardness is improved by 12.4%-16.85%.

The invention discloses a high-strength high-conductivity copper alloy material. The high-strength high-conductivity copper alloy material comprises, by weight percentage, 0.3wt%-0.8wt% of Cr, 0.05wt%-0.5wt% of Fe, 0.05wt%-0.3wt% of Ti, 0.01wt%-0.1wt% of Si and the balance Cu and inevitable impurities. The high-strength high-conductivity copper alloy is prepared through the alloying design of Cr,Fe, Ti, Si and other elements and a thermo-mechanical treatment technology taking two-stage aging as a main process. By means of the control over the sizes and the densities of a CrFe phase, a (Cr, Fe)2Ti and Cr3Si composite precipitated phase and a Cr elementary substance phase in a microscopic structure of the alloy, the effects of strengthening the alloy and improving the conductivity of the alloy are achieved. The copper alloy material can be applied to large-scale integrated circuit lead frames, folding screens and other products, the yield strength of manufactured strips is 650MPa or above, the electric conductivity is 65%IACS or above, and the good high-temperature softening resistance is achieved.

The invention discloses a system display method of an original austenite grain boundary of high-carbon high-alloy die steel. In the method, different corrosive agents are selected according to the heat treatment process of a sample; when the heating temperature exceeds 1100 DEG C, and the heat preservation time exceeds 400 s, a second metallographic etchant is selected and used; on the contrary, when the heating temperature is equal to or lower than 1100 DEG C, and the heat preservation time is within 400 s, a first metallographic etchant is selected and used; the treatment steps are as follows: sample preparation, corrosive agent preparation, sample corrosion and image acquisition. By applying the system display method disclosed by the invention, the grain boundary of the high-carbon high-alloy die steel sample under different heat treatment conditions can be systematically displayed, the original austenite grain size of the high-carbon high-alloy die steel can be clearly distinguished, the technical problem of difficult corrosion resistance and grain boundary display of the high-carbon high-alloy die steel is solved, and the measurement of the grain size and the evaluation of the grain size are greatly facilitated.

The invention relates to a thermal ageing assessment method of cast austenitic stainless steel of a CPR1000 nuclear power plant. The method comprises the following steps: (a) analyzing the elements of the austenitic stainless steel, and calculating the equivalent chromium content Creq and ferrite content deltac; (b) checking the casting manner and the material mark of the austenitic stainless steel; (c) calculating indoor-temperature Charp impact absorption energy Cv; (d) calculating a breaking tenacity value J1C and a breaking tenacity value Jd when the crack depth is 2.5mm; (e) determining the thermal ageing state of the austenite austenitic stainless steel according to the calculated indoor-temperature Charp impact absorption energy Cv, the breaking tenacity value J1C and the breaking tenacity value Jd when the crack depth is 2.5mm. The thermal ageing sensitivity and the thermal ageing state of the austenitic stainless steel can be assessed and judged by testing the mass content of the specific elements in the austenitic stainless steel based on the casting manner and the material mark; as a result, the problem that the breaking tenacity of the stainless steel cannot be judged in the operation process of the corresponding equipment/part of the CPR1000 nuclear power plant is solved, and a key way is provided for improving the safety of the power plant.

The invention discloses an ultrasonic inspection technology of large-size austenitic stainless steel forge pieces and application of the ultrasonic inspection technology, and belongs to the technical field of nondestructive testing in an equipment manufacturing industry. An ultrasonic inspection procedure of large-size thick-wall austenitic stainless steel forge pieces is formulated through selecting angles and frequency of a longitudinal wave angle probe, selecting a tapered wedge manufacturing material, designing a reference test block and the like; the technology is applied to the large-size austenitic stainless steel forge pieces with the section thickness of more than or equal to 600mm, and particularly can meet quality requirements on the austenitic stainless steel forge pieces of a nuclear power station primary loop.

The invention belongs to the technical field of bronze strip manufacturing, and particularly relates to a high-uniformity tin-phosphor bronze strip preparation process. The high-uniformity tin-phosphor bronze strip preparation process comprises the following steps of S1, smelting, S2, casting, S3, milling, S4, homogenizing heat treatment, S5, cold rough rolling, S6, intermediate annealing, S7, cold intermediate rolling, S8, cold finish rolling, and S9, finished product annealing. According to the technical scheme, the smelting process can improve the component and structure uniformity of a casting blank, the gas content in melt can be effectively reduced, meanwhile, the components in a smelting furnace are uniformly distributed, and the burnout rate of alloy elements is low; and in the subsequent processing process, microsegregation forms such as intragranular segregation and grain boundary segregation can be eliminated by promoting the high-temperature diffusion process, a recrystallization structure is controlled and residual stress is reduced through a combined deformation heat treatment process, the microsegregation and stress distribution uniformity of the alloy is further improved, so that a tin-phosphor bronze strip with good structure and performance uniformity is obtained.

The invention relates to a twin-roll strip casting-rolling production process for superaustenitic stainless steel. The twin-roll strip casting-rolling production process comprises the following steps: (1) hoisting and swinging molten steel with qualified components to a ladle turret; (2) injecting the molten steel into a tundish; (3) carrying out twin-roll casting-rolling; (4) carrying out strip billet hot-rolling; (5) carrying out strip steel cooling and head-tail removal; and (6) carrying out strip steel coiling. According to the twin-roll strip casting-rolling production process disclosed by the invention, a superaustenitic stainless steel strip is directly produced through the twin-roll casting-rolling, so that the hot-rolling procedure is simplified, and the surface layer cracking and layering cracking of superaustenitic stainless steel during hot-rolling in the prior art are avoided. Production for strips with thin gauges of 1.0-3.5mm is realized through the combination of the twin-roll casting-rolling and the hot-rolling, and qualified raw materials are provided for the subsequent cold-rolling process, so that energy consumption is reduced while the production flow is shortened.

The invention discloses a heating, spinning and thickening method for the annular outer edge of a round plate. The method comprises the step of heating the annular outer edge of the round plate and the step of carrying out spinning, thickening and integral forming on the annular outer edge of the round plate. In the heating step, a heating spray gun is used for heating the annular outer edge of the round plate in the whole forming process, and the temperature of the annular outer edge of the round plate is kept above the austenite transformation temperature; in the spinning, thickening and integral forming step, a spinning wheel with an annular rolling groove is used for performing radial feeding and extruding on the annular outer edge of the round plate, and therefore single-pass and large-thickening-ratio thickening can be achieved; and the heating spray gun and the spinning wheel are matched with each other so as to constantly thicken the heated annular outer edge of the round plate. By means of cooperation of the heating step and the spinning and thickening step, the metal plasticity is improved, metal flowing is facilitated, and the gradual thickening of the annular edge is achieved while a round plate is heated. The tonnage of a spinning machine needed by forming is small, a spinning wheel die is simple, large pressure machines or forging dies are not needed, and the manufacturing cost is reduced.

The invention relates to a deformation heat treatment method for toughening high-performance deformation rare-earth magnesium alloy, and belongs to the technical field of the alloy. The method comprises the following steps that 1) homogenizing heat treatment is performed; 2) pre-annealing heat treatment before deformation is performed, wherein pre-aging treatment is performed on an ingot blank needing to be extruded to deform at an extrusion temperature for 0.1h to 9h; 3) reverse extrusion deformation treatment is performed, wherein extrusion deformation treatment is performed on the pre-agedsample, the extrusion temperature is 400 DEG C to 450 DEG C, the extrusion ratio is 10:1 to 20:1, and the extrusion speed is 1 mm/s; and 4) aging heat treatment is performed, wherein T6 aging heat treatment is performed on the sample obtained after extrusion deformation. According to the deformation heat treatment method, the purposes that the toughness of the alloy can be obviously enhanced whilethe high strength is kept can be achieved, and the problem that the deformed magnesium alloy is high in strength and low in toughness is solved.

The invention discloses a high-strength steel car outer covering part assembly and a manufacturing method thereof. The method comprises the steps that a plate is cut into a needed blank shape, whereinthe plate is made from spring steel or medium manganese steel, and the plate is subjected to cold rolling treatment or cold rolling annealing acid pickling treatment; the blank is placed in heating equipment to be heated to austenitic temperature or above, and heat preservation is carried out; inert gas is introduced into the heating equipment, and the blank is taken out of the heating equipmentwhen the temperature of the blank is reduced to be below 700 DEG C; when the temperature of the blank is higher than the temperature of the point Ms, the blank is subjected to compression moulding; and the blank subjected to compression moulding is subjected to edge covering press fit, tempering and surface treatment. According to the high-strength steel car outer covering part assembly and the manufacturing method thereof, the high-strength spring steel or medium manganese steel is adopted as the car outer covering part assembly, the tensile strength ranges from 1,000 Mpa to 2,300 Mpa, the yield strength ranges from 1,000 Mpa to 1,500 Mpa, and the yield ratio ranges from 0.7 to 0.9; and the anti-dent performance is excellent, and meanwhile the thickness of the outer covering part can be reduced by 20% to 30%.

The invention discloses a quenching method for hot work die steel. According to the method, after protection is carried out according to the shape and size of a hot working die, a hot work die steel workpiece is treated in the manner of segmented temperature-controlled cooling under the condition of a temperature above martensite initiating transformation temperature; control of temperature in a high-pressure vacuum furnace is realized by using computer analog technology, the law of changing of the rotating speed of a fan with a temperature field in the furnace is controlled to realize automatic adjusting, so temperature changes of the die in the furnace is controlled. The quenching method for hot work die steel provided by the invention fully reduces temperature difference between and thermal stress on the surface of the hot work die steel workpiece and a core material, enables influence of thermal stress on quenching deformation to be greatly weakened when a hot work die steel material transforms from an austenite structure state to a martensite structure state, reduces cracking risks of the hot work die by changing cooling rates during quenching and allows a high impact toughness value to be obtained.

The invention relates to a high-specific-modulus aluminum alloy. The alloy is prepared from, by mass, 2%-4% of Li, 1%-7% of Mn, 0.05%-0.3% of Zr, 0.0%-0.3% of Ti, 0.0%-0.3% of Sc and the balance of Al. Li and Mn are necessary elements for improving the modulus of the aluminum alloy, and Zr, Ti and Sc are grain control elements. The preparation method comprises the following steps of weighing the components according to a designed aluminum alloy component proportion, smelting in a vacuum smelting furnace, casting, molding, and carrying out thermal deformation to form a bar or a plate. The aluminum alloy with high modulus and high specific modulus is prepared by adopting a smelting casting and deformation heat treatment method and controlling the contents of alloy elements (Li and Mn) with increased modulus and the grain control elements Zr, Ti and Sc. An aluminum-manganese-lithium alloy with modulus higher than that of the existing aluminum alloy is prepared, the preparation process is simple, and the alloy can be used as a light structural material with high specific stiffness.

Disclosed are an austenitic stainless steel, and a hydrogenation method thereof, in which occurrence of fatigue cracks and growth of fatigue cracks are suppressed by charging the austenitic stainless steel with hydrogen.

In particular, focusing on the amount of diffusible hydrogen and non-diffusible hydrogen, which cause hydrogen embrittlement in austenitic stainless steel, the fatigue strength characteristics of austenitic stainless steel are improved by bringing the amount of diffusible hydrogen and non-diffusible hydrogen contained in the austenitic stainless steel to 0.0030 wt % (30 wt ppm) or higher. The austenitic stainless steel is subjected to a thermal treatment at a heating temperature of 200 to 500° C. for up to 460 hours in a hydrogen environment. The hydrogen (H) contained in the austenitic stainless steel is brought thereby to 0.0030 wt % (30 wt ppm) or higher.

The invention discloses a heating processing technology of a metal steel tube, and belongs to the field of heat processing methods. The heating processing technology of a metal steel tube is characterized by adopting a method combing ferrite chemical treatment and austenite heat treatment; firstly carrying out low-temperature chemical heat treatment of sulfonitriding; then carrying out high-temperature chemical heat treatment of sulfonitriding over the critical temperature; simultaneously carrying out high-temperature chemical heat treatment of boriding over the critical temperature; then implementing austenite nitriding; and finally hardening and tempering. The manufactured steel tube has good quality and long service life, and the construction cost is low, and the whole process is environment-friendly.