40results about How to "Improve solid solution strengthening" patented technology

The invention relates to an AlxCrFeNiCuVTi high-entropy alloy material and a preparation method thereof. The high-entropy alloy comprises a component of AlxCrFeNiCuVTi, wherein x is a molar ratio, and the value range of x is 0.5-1.5. The preparation method of the alloy material comprises the following steps of: putting raw materials into a solution including acetone and ethanol, cleaning for 23-30 minutes by using an ultrasonic oscillator, and then drying in a 50DEG C drying oven for 6 hours; weighing alloys according to a molar ratio, and putting the alloys into a water-cooling copper crucible; when the air pressure in a furnace body reaches 3*10<-3>Pa, introducing high-purity argon to clean for 3-5 times; introducing high-purity argon to ensure that the air pressure in a furnace chamber is kept to be 0.8-0.9 atmospheric pressure, and then electrifying, wherein the smelting striking current is 30-40A, the current after stabilization is 90A, the time for smelting the alloys once is 10 seconds, and a sample needs to be smelted for 5 times repeatedly; and when the components of a smelted sample are uniformly cooled, taking the alloy out of the furnace. Compared with a conventional crystal alloy, the AlxCrFeNiCuVTi high-entropy alloy material has higher hardness, strength, high temperature stability, corrosion resistance and work hardening capacity.

The invention discloses a hard alloy for a soaking plate. The hard alloy is characterized in that the hard alloy is prepared by means of the method that Cr3C2 and Cu are added into a super coarse grain WC-14Ni alloy, wherein all raw materials are weighed according to the mode that the raw materials comprise, by weight, 1.0-2.8% of Cr3C2, 0.5-3.5% of Cu and the balance super coarse grain WC-14Ni alloy. By adopting super coarse grain WC and adjusting the component ratio of Cr3C2 and Cu, a compact oxidation film protection layer is formed on the alloy surface of the soaking plate under the high-temperature work condition, thus the soaking plate has extremely good high-temperature-oxidation-resisting performance, and the heat conductivity and high-temperature hardness of the soaking plate canbe improved; and according to the hard alloy, preparation is easy, the performance of the soaking plate can be effectively improved, the gap of the field in China is filled up, and the current situation that the soaking plate of China relies on a foreign product is overcome, and huge economic benefits are achieved.

The invention discloses a high-strength Ti-Cr-Zr-Mo-Al series titanium alloy and a preparation method . The titanium alloy is prepared from the following components in percentage by mass: 2.5% to 6.0% of Al, 1.5% to 5.0% of Cr, 1.4% to 5.0% of Zr, 2.0% to 8.0% of Mo, less than or equal to 0.35% of O and the balance of Ti and other inevitable impurities. After the alloy is subjected to smelting, forging, solid solution and aging treatment, high strength and good plasticity can be obtained, composition segregation is not likely to be caused, meanwhile, the cost of alloy raw materials is low, and the production and manufacturing cost of the alloy is reduced to a certain degree. According to the high-strength Ti-Cr-Zr-Mo-Al series titanium alloy and the preparation method, the alloy meets the requirements of various industrial fields for high performance of titanium alloy structural parts, and can be widely applied to the industrial fields of aviation, aerospace, automobiles and the like.

The invention relates to a heat treatment method of promoting precipitation of nano-scale carbide in W-containing alloy steel. The heat treatment method is charaterized by comprising the following steps of soaking a steel billet for 24-48h under the condition with the temperature being 1100-1200 DEG C, and performing cooling along with a furnace to a room temperature; performing austenitizing for20-40min under the condition with the temperature being 850-1000 DEG C, and performing quenching in ice salt water; performing heating to 650-750 DEG C under the condition with the vacuum degree being10<-3>-10<-2>Pa and the magnetic field intensity being 10-14T and at a speed of 3-7 DEG C / min, keeping isothermy for 0.5-3.0h, and cooling to the room temperature, wherein the steel billet is prepared from the following chemical components: 0.06-0.14wt% of C, 1.50-3.00wt% of W, smaller than 0.01wt% of P, smaller than 0.005wt% of S and the balance of Fe and inevitable impurities, and the temperature of the ice salt water is 3 DEG C below zero to 1 DEG C below zero. The heat treatment method provided by the invention is simple in technology, low in cost and short in production period; and the strength of the W-containing alloy steel subjected to treatment with the method is obviously improved.

The invention relates to an ultralow-temperature rolling preparation method for a deformed Al-Mg alloy with ultrahigh Mg content. The ultralow-temperature rolling preparation method comprises the following steps: performing component homogenizing treatment, compacting treatment and treatment for enabling solid solution to form a single-phase solid solution on a cast ingot of the Al-Mg alloy at a temperature lower than an alloy solid-phase line temperature of 0-80 DEG C; performing ultralow-temperature rolling; and annealing at a temperature of 50-200 DEG C to obtain the final deformed Al-Mg alloy with ultrahigh Mg content. The technology in the invention remarkably improve dislocations strengthening and grain boundary strengthening in the Al-Mg alloy with ultrahigh Mg content, improves strength, can be used for producing with high efficiency and low cost on a large scale, and has a wide industrial prospect.

The invention discloses an Al-Mg-Er welding wire and a preparation process thereof. The Al-Mg-Er welding wire mainly comprises the following chemical components in percentage by mass: 4.3 to 6.5 percent of Mg, 0.4 to1.2 percent of Mn, 0.05 to 1.3 percent of Zr, 0.1 to 0.6 percent of Er and the balance of Al and other inevitable impurities. The preparation method comprises: preparing pure aluminumingots, pure magnesium ingots, Al-Mn(10.0) preliminary alloy, Al-Er (0.6) preliminary alloy and Al-Zr (4.5) preliminary alloy; melting the alloys in a mixing ratio in a medium frequency induction electric resistance furnace and performing casting to make a cast ingot; subjecting the homogenized cast ingot to end cutting and face milling and hot extrusion; and after intermediate annealing, performing wire drawing in a wire drawing machine while performing pass annealing, subjecting the wire drawn to surface treatment, and coiling the wire to obtain the Al-Mg-Er welding wire of the invention. The welding wire of the invention has the advantages that: the smelting process is stable and easy to implement and the drawing performance of the welding wire is high; the obvious refining molding performance of the structure of the welding wire is high, the strength of weld joint metal is guaranteed and that the plasticity of weld joint metal is equal to that of a parent metal is guaranteed; and the impurity content of the Al-Mg-Er welding wire is low, the toughness is improved, the solution strengthening of an aluminum substrate is promoted, and the strength of the weld joint metal is improved effectively.

The invention discloses high-temperature resisting, abrasion resisting, corrosion resisting and cavitation resisting nickel-chromium-chromium carbide composite powder and a high-temperature resisting, abrasion resisting, corrosion resisting and cavitation resisting nickel-chromium-chromium carbide coating prepared through the composite powder. The composite powder comprises, by weight percentage, 65-85% of Cr3C2, 10-25% of NiCr, 1-5% of Nb and 1-5% of Ta. The coating is prepared in the manner that the composite powder is subjected to hypersonic flame spraying or high-enthalpy plasma spraying or is subjected to hypersonic flame spraying or high-enthalpy plasma spraying, and then the high-enthalpy plasma remelting technology is combined. The coating is greatly improved in the aspects of microhardness, combing strength, corrosion resistance and cavitation resistance. Meanwhile, the production cost is low, the preparing method is reliable in technology, performance is stable, and the coating is suitable for being applied to the fields such as hydraulic machine flow passage components, compressor screws and turbine blades on a large scale.

The invention relates to a preparation method for a deforming Al-Mg alloy with ultrahigh Mg content. The preparation method comprises the following steps of firstly, carrying out component homogenization treatment, densification treatment, and solid solution treatment for forming a single-phase solid solution on an Al-Mg alloy ingot at the temperature of 0-80 DEG C lower than the alloy solidus temperature; then carrying out plastic deformation at the temperature of 20-300 DEG C; and carrying out annealing at the temperature of 50-300 DEG C according to requirements so as to obtain the final deforming Al-Mg alloy with ultrahigh Mg content. Compared with an existing industrialized deforming and casting Al-Mg alloy manufacturing technology, the preparation method has the advantages that solidsolution strengthening, dislocation strengthening and grain boundary strengthening of Mg can be enhanced, and the strength of the Al-Mg alloy can be improved; and compared with a deforming Al-Mg alloy with ultrahigh Mg content prepared through severe plastic deformation and nanocrystalline powder consolidation, the method has the advantages that a large amount of deforming Al-Mg alloys with ultrahigh Mg content can be prepared efficiently at low cost, and a wide industrialization prospect can be achieved.

The invention discloses a rare earth additive for hard alloy. The rare earth additive for hard alloy is rare earth-binder phase alloy powder with a granularity smaller than 10mum, and the weight percentage of components of the raw materials are as follows: 60-99 percent of binder phase raw material and 1-40 percent of rare earth, wherein the binder phase raw material is formed by Co, Mn and M, and M is at least one out of Ni, Fe, Cr, V, Cu and Al. Two preparation methods are available for the rare earth additive. The first preparation method comprises the steps of casting the binder phase raw material and the rare earth into ingot, smashing the ingot into blocks with size smaller than 20mm, performing homogenizing annealing to the blocks under vacuum condition, or performing rapid quenching to the blocks in an electric-arc remelting rapid quenching furnace to form a rare earth-binder phase alloy thin strip and performing hydrogen absorption, and carrying out ball-milling smashing to the product treated by hydrogen absorption under the protection of argon. The second preparation method comprises the steps of casting the binder phase raw material and the rare earth into ingot, smashing the ingot into blocks with size smaller than 20mm, and performing atomization to the alloy blocks after the alloy blocks are smelted into alloy melts, so as to form atomized powder.

The invention discloses 480MPa-grade galvanized strip steel. The 480MPa-grade galvanized strip steel comprises, by mass, 0.05-0.09% of C, 0.05% or less of Si, 0.8-1.0% of Mn, 0.016% or less of P, 0.008% or less of S, 0.015-0.035% of Nb, 0.020-0.045% of Als, 0.007% or less of N, 0.015-0.035% of Ti, 0.0015-0.0030% of Ca, and the balance Fe. A production method comprises the steps that converter smelting and LF refining are conducted in a low-nitrogen mode; protective continuous casting is conducted, and nitrogen is controlled to be increased; and calcium treatment is conducted after refining is completed, wherein the mass percent of acid-insoluble aluminum in molten steel is smaller than or equal to 45 ppm, the ratio of the mass percent of the acid-insoluble aluminum to that of calcium is 0.5-1.5, and the ratio of the mass percent of the acid-insoluble aluminum to that of acid soluble aluminum is 0.05-0.20. According to the 480MPa-grade galvanized strip steel, the production cost is low, the overall mechanical performance of the product is superior, and the surface quality meets the requirements of FB surface levels in GB2518 and EN10346.

The invention relates to the field of cupronickel pipes, and in particular relates to a cupronickel pipe for the ocean engineering and a manufacturing method thereof. The cupronickel pipe comprises the following chemical components by weight percent: 22.0 to 24.0 percent of nickel (Ni), 2.0 to 4.0 percent of zinc (Zn), 2.0 to 4.0 percent of cobalt (Co), 1.0 to 3.0 percent of manganese (Mn), 1.0 to 2.0 percent of iron (Fe), 1.0 to 2.0 percent of aluminum (Al), 0.3 to 0.5 percent of tin (Sn), 0.1 to 0.3 percent of titanium (Ti), 0.005 to 0.01 percent of boron (B), 0.05 to 0.15 percent of rare earth (RE) and the balance of copper (Cu). After a cupronickel pipe blank is obtained by adopting an induction smelting way, the cupronickel pipe blank is subjected to coil drawing, namely horizontal continuous casting, pipe blank surface milling, planetary rolling through three rollers, straight drawing through three continuous drawing machines, inverted coil drawing, refining rewinding, annealing and finished product inspection. The cupronickel pipe for the ocean engineering is strong in seawater corrosion resistance. Meanwhile, the problems that the traditional copper-nickel alloy material is short in service life and cannot adapt to the coil drawing production way due to the low plasticity can be solved, and the coil drawing of the cupronickel pipe can be realized.

The invention relates to an ultralow-temperature rolling preparation method for a deformed Al-Mg alloy with ultrahigh Mg content. The ultralow-temperature rolling preparation method comprises the following steps: performing component homogenizing treatment, compacting treatment and treatment for enabling solid solution to form a single-phase solid solution on a cast ingot of the Al-Mg alloy at a temperature lower than an alloy solid-phase line temperature of 0-80 DEG C; performing ultralow-temperature rolling; and annealing at a temperature of 50-200 DEG C to obtain the final deformed Al-Mg alloy with ultrahigh Mg content. The technology in the invention remarkably improve dislocations strengthening and grain boundary strengthening in the Al-Mg alloy with ultrahigh Mg content, improves strength, can be used for producing with high efficiency and low cost on a large scale, and has a wide industrial prospect.

The invention discloses a high-strength and high-plastic high-entropy alloy and a preparation method thereof, belonging to the technical field of metal materials and manufacture. The raw materials for the preparation of the high-entropy alloy of the present invention are Co, Cr, Fe, Ni metal particles and Al-10Er (Er mass fraction is 10%) intermediate alloy particles, and the preparation method is as follows: the above-mentioned metal particles are weighed according to the set ratio , melted in a high-vacuum arc melting furnace and then solidified in a copper mold to prepare a high-entropy alloy. In the melting process, in order to ensure the uniformity of the alloy composition, the alloy block needs to be smelted repeatedly. Homogenize the as-cast high-entropy alloy prepared initially in a high-temperature heat treatment furnace, then water quench, and roll the high-entropy alloy ingot at a temperature of 500-800°C, and cool the rolled sample with air , a high-entropy alloy with high strength and high plasticity can be obtained. The high-entropy alloy prepared by the invention has excellent mechanical properties and simple preparation process.

The invention discloses a high-entropy alloy with a banded precipitated phase. The high-entropy alloy consists of Co, Cr, Ni and Mo elements, wherein the atomic percent of Co is 25-35%, the atomic percent of Cr is 25-35%, the atomic percent of Ni is 25-35%, the atomic percent of Mo is 5-15%, and the sum of atomic percents of the components is 100%. The phase composition of the high-entropy alloy with the banded precipitated phase comprises a face-centered cubic phase and a sigma precipitated phase, wherein the sigma precipitated phase accounts for 40-60%. In the preparation method, the non-uniform precipitation of the Mo-rich phase is achieved through the combination of hot processing, solid solution processing, cold processing and annealing process, and the high-entropy alloy with the banded precipitated phase is obtained. The alloy can ensure excellent strength and toughness matching, and has application prospects in the fields of cutter materials, aerospace materials and the like.