46results about How to "Increased Diffusion Enhancement Effect" patented technology

The invention relates to hot-work die steel for an extrusion wheel and a manufacturing method of the die steel. The invention adopts the technical scheme that the manufacturing method comprises the following steps: hot-forging after scrap steel or molten iron and scrap steel are smelted in an electric furnace and are subjected to electroslag remelting or vacuum induction melting and then carry out spheroidizing annealing at a temperature of 700-880 DEG C; quenching at a temperature of 1,020-1,120 DEG C and tempering at a temperature of 530-650 DEG C, wherein the hot-work die steel has a hardness of up to 40-52HRC and a tensile strength of up to 1,850-1,955MPa. The hot-work die steel comprises the following chemical components in percentage by weight: 0.30-0.50wt% of C, 0.80-1.20wt% of Si, 0.2-0.5wt% of Mn, 3.00-5.00wt% of Cr, 1.00-1.50wt% of Mo, 0.70-1.20wt% of V, 0.005-0.03wt% of N and less than 0.030wt% of P, less than 0.030wt% of S and the balances of Fe and inevitable impurities. The steel has the characteristics of low cost, good thermal fatigue property, high heat stability and excellent comprehensive property and can be used for manufacturing the extrusion wheel of a continuously-extrusion-molded coating machine and other hot-work dies.

The invention relates to a thermal treatment process for a TC18 titanium alloy and belongs to the technical field of materials. A method comprises the following steps: preserving heat of the TC18 titanium alloy at the temperature between Tbeta-60 DEG C and Tbeta-100 DEG C (Tbeta is the beta-phase transition temperature of the alloy) for 2-8 hours, and cooling to the room temperature through air cooling or water cooling; aging the alloy at the temperature of 540-600 DEG C for 4-12 hours, and cooling to the room temperature through air cooling. By selecting the heat-preserving temperature, time and cooling way, the microscopic structure of the alloy can be regulated and controlled effectively, a microscopic structure in which an equiaxial phase alpha (the content is higher than 10 percent by volume, and the size is greater than 2 microns), a flaky phase alpha (the thickness is greater than 0.5 micron) as well as a large number of fine needle phase-alpha and phase-beta substrates are matched is realized, the TC18 titanium alloy is high in strength, plasticity and toughness, and the problems of poor alloy strength in a dual annealing process and difficulty in meeting the use requirements on the plasticity and toughness of the alloy in a solid solution-aging process are solved. The method is suitable for industrial application.

The invention discloses an oxide dispersion reinforced platinum-based alloy, which comprises a platinum alloy base material and a dispersion reinforcing phase dispersed in the platinum alloy base material, wherein the dispersion reinforcing phase consists of an oxide of boron, an oxide of erbium and an oxide of at least one of lanthanum and zirconium; and elements except oxygen in the dispersion reinforcing phase accounts for 0.015 to 0.8 percent of the total weight of the oxide dispersion reinforced platinum-based alloy, wherein at least 85 weight percent of dispersion reinforcing phase is dispersed in the platinum alloy matrix in a nano granule state. The invention also discloses a preparation method for the platinum alloy material. The platinum alloy material has the characteristics of excellent high-temperature mechanical property, short production period and the like, and is particularly suitable for manufacturing a porous dense large-sized glass fiber leakage plate (3,200 to 8,000 holes) and other required platinum-based high-temperature alloy structural materials.

The invention provides WC particle reinforced composite brazing filler metal used for brazing hard alloy and a preparation method thereof, and relates to a brazing material and a preparation method thereof. The invention aims to solve the technical problems that a hard alloy brazed joint is easy to wear, relatively low in working strength and poor in wettability. The brazing filler metal provided by the invention is prepared from Al, Ti, Ni, W, Co, Cr, B, Fe, Si powder and WC particles. The preparation method comprises the following steps of weighing of raw materials, mechanical alloying of composite brazing filler metal, smelting and preparing of composite brazing filler metal foils. After going through a ball-milling process, a high-temperature smelting process and an ultrasonic vibrating process, the WC particles generate obvious refining behaviors, so that the dispersivity of WC particle reinforced phases in a brazing filler metal substrate is better, the uniformity of the whole brazing filler metal is improved, and therefore the performance stability of the brazing filler metal is ensured. The invention belongs to the field of brazing filler metal preparation.

The invention discloses a zirconium-containing copper silver titanium solder alloy. The zirconium-containing copper silver titanium solder alloy comprises the following components by mass percent: 10-45% of Ag, 1-4% of Ti, 0.5-5% of Zr and Cu for the rest. A vacuum melting and argon shield casting mode is adopted, silver and copper are molten at first and then titanium and zirconium are added. The zirconium-containing copper silver titanium solder alloy can be used for directly soldering copper alloys, iron steel, ceramics and diamonds. The zirconium-containing copper silver titanium solder alloy has the advantages as follows: the cost is low; a connector is high in mechanical strength, has smooth surface, is stable in quality and is good in uniformity after the copper alloys are soldered by the zirconium-containing copper silver titanium solder alloy; and the joint clearances can be fully filled up. The zirconium-containing copper silver titanium solder alloy can replace the conventional copper silver titanium solder and is suitable for large-scale industrial application.

The invention discloses a low-cost high-plastic-deformation magnesium alloy. The magnesium alloy comprises the following components in percentage by mass: 0.5-4.0% of Mn, 0.1-0.5% of Al and the balance of magnesium and inevitable impurities. In an Mg-Al-Mn ternary system, elements manganese and aluminum define an aluminum-manganese phase, and a rich manganese element defines an elemental manganesephase. In a preparation process, an extrusion process at a relatively low temperature is adopted to prepare a high-plasticity magnesium alloy material which is suitable for 3C product shells, bearingstructures for leisure goods as well as aerospace parts and the like; and the material is simple in preparation process, is low in cost, and has a very good industrialized prospect.

The invention provides a method for improving the low-temperature impact toughness of a high-strength steel hot rolled plate coil for engineering machines, which belongs to the technical field of steel for engineering machines. The method adopts a hot feeding and hot loading process, and the control technical parameters in the process include a hot loading temperature, a pouring superheat degree and a drawing speed, wherein the hot loading temperature is 500 to 600 DEG C, the pouring superheat degree is 18 to 20 DEG C, and the drawing speed is controlled to be 1.2 to 1.4m/min. Production is carried out in a mode of coarsely rolling by two machine frames and finely rolling by six machine frames, six-pass rolling is adopted in a coarse rolling phase, six-pass fine rolling is adopted in a fine rolling phase, and the rolling reduction in a non-recrystallized areas of austenite is 65 to 70 percent. A front-end laminar flow cooling mode is adopted for quickly cooling to a target temperature after fine rolling, and the cooling speed is improved to 10 to 15DEG C/s. After being removed from the production line, the plate coil is cooled by wind to 100 DEG C and then by air to room temperature. The method has the advantages of ensuring high strength and high toughness at the same time, saving consumption and improving production efficiency.

The invention discloses a high-strength and high-conductivity copper alloy wire material and a preparation method thereof. The high-strength and high-conductivity copper alloy wire material comprises,by mass percent, 0.2-0.6% of Ni, 0.1-0.4% of Fe, 0.07-0.17% of Mg, 0.10-0.15% of Ca, 0.01-0.09% of Ag, 0.1-0.3% of La, 0.01-0.03% of P, 0.01-0.03% of Sn, 0.1-0.5% of Ti and the balance Cu. By means of Ni solution strengthening, a microalloying refine structure and a second phase, the high-strength and corrosion-resistant Cu-Ni alloy wire material with excellent comprehensive performance is obtained.

The invention relates to a method for preparing a nano spherical oxide dispersion strengthening phase, and provides a method for preparing the nano spherical oxide dispersion strengthening phase by adopting micron oxide for the first time. Firstly, nano oxide/matrix alloy composite powder with a completely amorphous structure is prepared by taking the micron oxide as a raw material and adopting astaged mechanical ball milling method. According to the preparation method, ball milling is carried out at the first stage, so that the oxide is subjected to crushing and structural transformation, nanocrystallization and complete amorphization are realized, and composite powder in which the nano oxide with a complete amorphous structure is uniformly distributed in matrix alloy powder is prepared;and in the second stage, the composite powder obtained in the first stage and the remaining matrix alloy powder are subjected to ball milling and evenly mixed. Then, the prepared powder is sequentially subjected to hot forming, hot rolling and heat treatment, and the nano spherical oxide dispersion strengthened alloy is obtained. According to the method, the dispersion strengthening effect of anoxide phase can be obviously improved, and the room-temperature and high-temperature mechanical properties of the alloy are obviously improved. The method is simple, the production efficiency is high,the prepared alloy is excellent in performance, and the strength and plasticity of the alloy are obviously superior to those of the same type of alloy.

The invention provides a hot working method for improving mechanical properties of medium carbon steel, and relates to the technical field of metal material science. The hot working method comprises the step: the medium carbon steel is sequentially subjected to high-temperature and high-pressure heat treatment and low-temperature and high-pressure heat treatment. The medium carbon steel is subjected to high-temperature and high-pressure heat treatment to obtain a fine martensite structure with the high dislocation density, dislocation provides more positions for precipitation of carbide in thesubsequent low-temperature and high-pressure heat treatment process, and the number of precipitated carbide particles is increased; and through low-temperature and high-pressure heat treatment, the diffusion coefficient of atoms is decreased under the high pressure effect, thus the number of the precipitated carbide particles is large, the precipitated carbide particles are not prone to growing up and thus are finer and more dispersed, the dispersion enhancement effect is enhanced, and the hardness and strength of the medium carbon steel are increased. Compared with the same process normal-pressure heat treatment, the hardness value and compression yield strength of the medium carbon steel treated through the hot working method are increased by 10.00-12.12% and 10.77-14.33% correspondingly.

A method for improving the hardness of an Al-Si alloy mainly comprises the following steps: putting the Al-Si alloy into a resistance furnace, heating to 515-525DEG C, maintaining the temperature for 120-150min, discharging the alloy from the furnace, and cooling with water, wherein the alloy comprises 4.0-6.0wt% of Si, 0-2.0wt% of Cu, 0.3-0.7wt% of Mg, 0.2-0.7wt% of Mn, and the balance Al; and putting the Al-Si alloy subjected to solid solution treatment into a cubic press, adjusting the pressure to 1-3GPa, heating to 180-200DEG C, maintaining the temperature for 120-150min, and carrying out power-off pressure-maintaining natural-cooling to room temperature. The method has the advantages of simple process, convenient operation, low cost and stable quality; and the hardness of the Al-Si alloy processed through the method is greatly improved, is 60-68% higher than that of the unprocessed Al-Si alloy, and is 8-13% higher than that of the Al-Si alloy processed through routine methods.

The invention discloses a high-impact 7-series aluminum alloy. The high-impact 7-series aluminum alloy comprises the following components of 0.1%-0.2% of Si, less than or equal to 0.2% of Fe, 0.35%-0.6% of Cu, less than or equal to 0.5% of Mn, 1.5%-2.5% of Mg, less than or equal to 0.15% of Cr, 6.0%-7.5% of Zn, 0.25%-0.35% of Zr, less than or equal to 0.1% of Ti and the balance Al, wherein other alloy elements are less than or equal to 0.05% individually and less than 0.15% totally, a ratio of the Si to the Fe is 1:0.6-0.8, and a ratio of the Zn to the Mg is 3.4-3.6:1.

The invention discloses a high-strength and high-thermal-conductivity copper alloy material roller sleeve and its preparation method, which is composed of the following components in mass percentage: Ni: 2.2wt% to 2.6wt%, Be: 0.2wt% to 0.6wt%, Si: 0.2 wt%~0.6wt%, Mg: 0.07wt%~0.17wt%, Ca: 0.04wt%~0.10wt%, Ag: 0.01wt%~0.05wt%, La: 0.1wt%~0.3wt%, Co: 0.01 wt%-0.03wt%, Al: 0.1wt%-0.5wt%, Cd: 0.1wt%-0.5wt%, and the balance is Cu. The present invention obtains a high-strength and high-thermal-conductivity Cu-Be alloy material with excellent comprehensive performance through the solid solution strengthening and microalloying of Ni to refine the structure and the second phase.