35results about How to "Promoting dispersive precipitation" patented technology

A copper chromium zirconium alloy comprises, by weight, 0.7% to 2.0% of chromium, 0.05% to 0.3% of zirconium, 0.01% to 0.08% of magnesium, 0.01% to 0.1% of yttrium and the balance copper. The invention further provides a preparing method of the copper chromium zirconium alloy. The preparing method sequentially comprises the following steps that firstly, the copper, the chromium, the zirconium, the magnesium and the yttrium are prepared according to the proportion and are subject to vacuum purified smelting and flow dividing type casting, and a casting blank is prepared; secondly, the casting blank is subject to homogenization treatment and hot extrusion, and a sheared billet is prepared; thirdly, the sheared billet is subject to solid-solution treatment; fourthly, the sheared billet obtained after the solid-solution treatment is subject to cold deformation machining; and fifthly, a material obtained after cold deformation machining is subject to aging treatment, and the needed copper chromium zirconium alloy is obtained. The copper chromium zirconium alloy has the good comprehensive performance, the room temperature tensile strength of the copper chromium zirconium alloy is larger than 520 MPa, the room temperature elongation of the copper chromium zirconium alloy is larger than or equal to 22%, the room temperature electric conductivity of the copper chromium zirconium alloy is larger than or equal to 90%IACS, and the 350 DEG C high-temperature tensile strength of the copper chromium zirconium alloy is larger than 390 MPa.

The invention discloses a low-alloy martensite steel high-toughness treatment method and martensite steel. The low-alloy martensite steel high-toughness treatment method comprises the following steps:(1) pretreatment, wherein a uniform single-phase austenite structure is obtained; (S2) high-temperature forging, wherein a forging ratio is 50-80%, a final forging temperature is higher than a martensite transformation temperature by 50-100 DEG C, and the austenite structure is cooled to the room temperature to obtain a structure taking martensite as the principal thing; (S3) medium-temperature forging, wherein heat is preserved at a temperature higher than the martensite transformation temperature by 30-70 DEG C, air cooling is performed, forging begins while the temperature is cooled to a temperature lower than an eutectoid transformation temperature by 30-100 DEG C, the forging ratio is 70-90%, the final forging temperature is lower than the eutectoid transformation temperature by 150-250 DEG C, forging total time is within 2 minutes, quenching cooling is performed until the room temperature, and the structure taking the uniform fine batten as the principal thing is obtained; and (S4), low-temperature tempering. According to the method disclosed by the invention, high-temperature forging and medium-temperature forging are combined, so that original austenite grains can be remarkably refined, and therefore, plasticity and toughness are remarkably improved while strength of the martensite steel is increased.

The invention discloses a medical osteotome for mandible plastic surgery and a preparation method thereof. The medical osteotome comprises the following material components: 0.20% to 0.55% of C, 12% to 20% of Cr, 0.2% to 0.8% of Si, 0.5% to 1.5% of Mn, 0.3% to 1.0% of Ni, 0.5% to 1.5% of Mo, 0.2% to 0.5% of N, Fe and a small amount of impurity elements. The preparation method comprises the steps of heating a roughly machined osteotome blank to 1000 DEG C to 1050 DEG C for austenitizing; then, carrying out cryogenic treatment on the osteotome at the temperature of minus 60 DEG C to minus 130 DEG C; then, carrying out tempering on the osteotome at the temperature of 150 DEG C to 200 DEG C two times, wherein tempering is carried out for not less than 2 hours each time; then, air cooling the osteotome to the room temperature; and carrying out finish machining treatment on the osteotome blank to obtain a final finished product. The osteotome is applicable to mandible plastic surgery and has relatively high hardness and toughness, the edge of the osteotome is not liable to curl during the surgery, the service life of the osteotome is greatly prolonged, and safety and reliability of the surgery are guaranteed.

The invention belongs to the field of steel-making continuous casting production of micro-alloy high-strength steel, and discloses a method for improving the high temperature plasticity of steel basedon a synergistic effect of magnesium treatment and two-times cooling. By the synergistic effect of a magnesium treatment process and a novel two-times cooling control process, components, the size and the distribution state of second-phase particles in a micro-alloy high-strength steel casting blank can be effectively controlled, the thickness of a proeutectoid ferrite film distributed along an original austenite grain boundary is controlled, the percentage reduction of area of the casting blank is increased significantly through detection with Gleeble3800 and is higher than 50%. Thus the effects that method can significantly improve the high temperature plasticity of the micro-alloy high-strength steel and the surface crack defects of the casting blank can be overcome effectively are verified.

The invention relates to an overlaying welding repairing technology of a stainless steel cold-rolled bearing roller, and the technology belongs to the field of metal processing. According to the use conditions of a narrow-band stainless steel cold-rolled bearing roller, a YJ012-S overlaying welding transition layer and a YJ243-S flux-cored wire are selected as overlaying welding working layers to carry out overlaying welding repairing to the cold-rolled bearing roller together with an automatic submerged arc overlaying welding process of preheating before welding and tempering heat treatment after welding. According to the cold-rolled bearing roller after subjected to overlaying welding repairing, the toughness and the wear resistance are better than those of original 9Cr2Mo roller surface metal. The repaired cold-rolled bearing roller is operated and assessed on an actual production line. Compared with an original roller, the service life is doubled and the use requirements on the cold-rolled bearing roller are met. A main process comprises processing and detection before welding, ,preheating, overlaying welding and destressing and tempering after welding.

The invention provides a high-strength magnesium-lithium alloy and a preparation method of cryogenic strengthening treatment of the high-strength magnesium-lithium alloy, and belongs to the technicalfield of high-strength alloys and preparation thereof. The high-strength magnesium-lithium alloy comprises Li, Y, Zn, unavoidable impurity elements and Mg. The atomic ratio of Y and Zn is higher than1.32. The preparation method of cryogenic strengthening treatment of the high-strength magnesium-lithium alloy comprises the steps of smelting and casting, homogenization heat treatment, 77 K cryogenic treatment, plastic forming machining and the like. According to the high-strength magnesium-lithium alloy and the preparation method of cryogenic strengthening treatment of the high-strength magnesium-lithium alloy, the Y and Zn elements are dissolved into a magnesium-lithium alloy matrix by simultaneously adding the Y and Zn elements, twin crystal refined grains are obtained in an alpha-Mg phase through homogenization heat treatment, cryogenic treatment, plastic forming machining, self-generating in a beta-Li phase is conducted to obtain an X-Mg12YZn phase of a layered LPSO structure, the effect of strengthening the beta-Li phase is achieved, and therefore the alloy is strengthened.

The invention discloses a vanadium nitride and ferrovanadium nitride alloy reinforcing agent and a preparing method and application thereof, and belongs to the field of special alloy materials. The reinforcing agent comprises 23%-66% of Si, 0.1%-17.5% of Mn, 11%-37% of N, 0%-9.6% of Ti, 0%-7.3% of Cr, 0.03%-5.6% of Al, 0.1%-1.9% of C, smaller than or equal to 0.10% of P, smaller than or equal to 0.15% of S and the balance Fe and impurities. Nitrogen fixation alloy elements such as the element Si and the element Mn are preferably selected, and nitride is formed by the N and the nitrogen fixation alloy elements. Preferable selection of the nitrogen fixation alloy elements mainly has the following beneficial effects that the combination rate of the nitrogen fixation alloy elements and the N is high; secondly, the nitrogen fixation alloy elements are beneficial to and harmless to molten steel; and thirdly, the thermodynamics environment of molten steel deoxidization, desulfuration vanadium nitride optimization and vanadium nitride iron microalloying is facilitated, more nitrogen ions can be cured, and the utilization rate of the alloy elements is greatly increased.

The invention relates to a preparation method of a 12Cr2Mo1 hot-rolling container steel plate, and belongs to the technical field of a metallurgical material. The preparation method comprises the following steps: heating the hot-rolled steel plate to 900 to 940 DEG C, preserving heat for 30 to 50 minutes and performing heat-preserving treatment for the first time; and after performing heat-preserving treatment for the first time, cooling to 670 to 730 DEG C, preserving heat for 20 to 30 minutes, performing heat-preserving treatment for the second time and then cooling to a room temperature after performing heat-preserving treatment for the second time. The continuous heat treatment method is high in production efficiency.

The invention discloses a low-carbon anti-fatigue steel plate for wind power and a preparation method thereof, and belongs to the technical field of ferrous metallurgy. The steel plate for wind power comprises the following chemical components in percentage by mass: 0.08%-0.12% of C, 0.25%-0.35% of Si, 1.45%-1.60% of Mn, 0.02%-0.03% of Nb, 0.03%-0.05% of Al, 0.01%-0.02% of Ti, 0.10%-0.20% of Ni, 0.02%-0.03% of V, less than or equal to 0.10% of Cr, less than or equal to 0.008% of N, less than or equal to 0.012% of P, less than or equal to 0.005% of S, less than or equal to 0.002% of O and the balance of Fe and inevitable impurities. The preparation method comprises billet heating, a rough rolling procedure, a finish rolling procedure, a cooling procedure and tempering heat treatment. The yield strength and fatigue strength of the steel plate for wind power are improved, the welding performance is excellent, and the service life of the steel plate for wind power is prolonged.

The invention discloses a semi-continuous metal casting process of a novel heat-resistant copper alloy and application of the novel heat-resistant copper alloy. The copper alloy comprises, by weight, 0.1%-5.0% of Ni, 0.01%-0.5% of Al, 0.01%-2.0% of Si, 0.01%-1.0% of Cr and the balance Cu. The preparation processes of a copper alloy profile include burdening, smelting, hot extrusion, cold drawing and aging treatment. According to the semi-continuous metal casting process of the novel heat-resistant copper alloy and the application of the novel heat-resistant copper alloy, on the basis of a copper alloy material containing Ni and Al, Si and Cr elements are further added, the reasonable ratio of all metal elements is balanced through semi-continuous casting, the performance of a nickel-silicon-copper alloy is improved, the Be-free and Co-free CuNi2SiCrAl high-performance copper alloy is developed and used for replacing beryllium-cobalt-copper series alloys, meanwhile, the raw material cost of the material is greatly reduced, and the copper alloy can be applied to a slot wedge copper alloy part of a steam turbine generator.

The invention discloses a heat treatment process for an ultra-fine grain structure of annealed hot work die steel, and belongs to the technical field of heat treatment of hot work die steel. The heat treatment material is an annealed hot-working die blank, and a plurality of thermocouples for detecting temperature are mounted on the core part and the surface of the die; comprising the steps of first-time high-temperature homogenization, first-time air/water alternate quenching, first-time high-temperature tempering, second-time high-temperature quenching after tempering, stress relief annealing, mold quenching and tempering and the like. The method has the beneficial effects that the heat treatment process is completely utilized for regulation and control, liquation carbides, martensite structures and austenite grains can be refined at the same time, and the impact toughness is improved while the material strength is kept. And the grain size can be improved from 6-7 grades to 8-10 grades, the transverse impact toughness can be improved by 15% or above, and the room-temperature plasticity is also improved.

The invention discloses a non-slip surgical scalpel, which comprises a blade and a strip-shaped scalpel handle. A making method comprises the following steps: I, crushing the following materials in apulverizer: 50-60 parts of superfine tungsten carbide, 12-20 parts of strontium titanate, 8-10 parts of titanium carbide, 6-8 parts of chromium carbide, 4-8 parts of molybdenum disilicide, 7-9 parts of titanium nitride, 1-2 parts of vanadium carbide and 3-4 parts of graphite powder, so that mixed powder, which is less than 20mm in diameter, is formed; II, heating the mixed powder obtained from thestep I to 850 DEG C under a vacuum condition for 4h, then adding 4-6 parts of phenolic resin, fully stirring all materials uniformly so as to obtain a mixture, and cooling the mixture; III, forming and pressing the mixture via a press machine, so that a pressed blank is formed; and IV, sintering the pressed blank in a sintering furnace, so that a blade blank is formed. According to the multifunctional scalpel provided by the invention, the cutting edge is sharper, and hard tissues can be cut open quite easily; and the blade is quite shape, quite high in intensity and cannot get bent easily.

The invention discloses a heat-treated vanadium-containing high-boron high-speed steel and a heat treatment method thereof. According to the heat treatment method, quenching treatment is conducted on the vanadium-containing high-boron high-speed steel at the temperature of 1010-1060 DEG C to obtain a quenched part; and the quenched part is subjected to tempering treatment twice, and after the part is subjected to air cooling to the room temperature, the heat-treated vanadium-containing high-boron high-speed steel is obtained. According to the vanadium-containing high-boron high-speed steel and the preparation method thereof, the form of boron carbide is improved through vanadium addition and a heat treatment process, matrix strengthening is promoted, the vanadium-containing high-boron high-speed steel with excellent strength and toughness is obtained, and the vanadium-containing high-boron high-speed steel subjected to heat treatment can be better adapted to severe working conditions when being applied to actual production.

The invention discloses a making method of a minimally invasive scalpel. One end of a blade is a cutting edge and the other end is provided with an inserting part; a lower bolt rod is screwed into a lower threaded hole and is embedded into a lower concave hole of the inserting part; a plurality of blood suction holes are formed in the cutting edge, and the blood suction holes communicate with a liquid collection tube via branch catheters; a chamfered inclined plane is arranged at the upper side of the cutting edge; a rubber sleeve sleeves the middle-rear part of a strip-shaped scalpel handle;and a plurality of convex points are uniformly distributed on the outer surface of the rubber sleeve. The blade is made by the following steps: crushing the following materials in a pulverizer: 50-60parts of superfine tungsten carbide, 12-20 parts of strontium titanate, 8-10 parts of titanium carbide, 6-8 parts of chromium carbide, 4-8 parts of molybdenum disilicide, 7-9 parts of titanium nitride, 1-2 parts of vanadium carbide and 3-4 parts of graphite powder, so that mixed powder, which is less than 20mm in diameter, is formed. According to the minimally invasive scalpel obtained by the making method provided by the invention, the blade of the scalpel is ultrahigh in hardness, and moreover, the blade, which is forged is quite sharp and is quite high in intensity so as to avoid easy bending; the minimally invasive scalpel is stable and reliable; and three-dimensional location is achieved.