32results about How to "Effect of diffusion strengthening" patented technology

The invention relates to high-strength weather resisting steel with Cu2-xS dispersed precipitates, which comprises the following chemical components in percentage by weight: 0.04-0.08% of C, 0.20-0.40% of Si, 0.4-1.0% of Mn, 0.03-0.12% of P, not more than 0.2% of S, 0.01-0.06% of Al, 0.20-0.80% of Cu, 0.40-0.6% of Cr, 0.12-0.40% of Ni, 0.001-0.006% of Ca and the balance of Fe and inevitable impurities. The welding cold crack sensitivity coefficient Pcm is not more than 0.18%. A manufacturing method comprises the following steps of: acceleratedly cooling both sides of a cast belt formed by continuous casting by using a gas and adopting a thin belt continuous casting production technology, wherein the cooling rate is 150-200 DEG C / s; performing the entire double-roller continuous casting process in a closed chamber filled with protective atmosphere; and arranging one to two stands for online hot rolling, wherein the thickness of a finished steel belt reaches 0.6-2 mm. The desulfurization procedure in steel making process can be omitted, and the steel making cost is reduced. The segregation of copper elements is inhibited, meanwhile, a large quantity of dispersed Cu2-xS precipitates can be formed to achieve the effect of dispersion strengthening.

The invention relates to a preparation method of a multi-element composite reinforced molybdenum alloy. The preparation method sequentially comprises the following steps that the Mo source, the Ti source, the Zr source, the C source, the Hf source and the Re source are weighed according to a certain weight ratio, the raw materials are prepared and mixed to obtain the uniform molybdenum alloy powder; the molybdenum alloy powder is placed in a mold cavity of a mold and is subjected to compression forming treatment to obtain a forming blank; high-temperature sintering treatment on the formed blank is carried out under vacuum to obtain a sintered blank; forging or rolling deformation processing is carried out on the sintered blank to obtain a forged blank or a rolled blank; and annealing heattreatment on the forged blank or the rolled blank is carried out to obtain the molybdenum alloy plate or a rod material. According to the preparation method, the steps and the process conditions are reasonable in design and good in using effect, the prepared molybdenum alloy material has excellent performance, the tensile strength Ra is greater than or equal to 200 MPa at a high temperature of 1600 DEG C, the percentage elongation after fracture is larger than or equal to 20%, and the oxygen content is less than or equal to 100 ppm.

The invention discloses a high-toughness rare earth heat-resistant magnesium alloy. The high-toughness rare earth heat-resistant magnesium alloy comprises the following chemical components of, in percentage by mass, 8.0%-10.8% of Gd, 3.1%-4.0% of Y, 1.8%-2.2% of Zn, 0.4%-0.5% of Zr and the balance magnesium and inevitable impurity elements, the invention further discloses a preparation method of the high-toughness rare earth heat-resistant magnesium alloy, the preparation method sequentially comprises the following steps of (1) preparing a magnesium alloy casting rod; (2) homogenization of the bar, specifically, heating a magnesium alloy bar and preserving heat by adopting a grading homogenization system, then heating and reheating, preserving heat and carrying out homogenization treatment; (3) upsetting-extruding composite deformation, specifically, putting the bar into a heated upsetting-extruding composite die, and obtaining a high-toughness deformation state rare earth heat-resistant magnesium alloy material after multiple times of cyclic upsetting-extruding. (4) solid solution and aging treatment, specifically, enabling heat treatment to adopt solid solution and aging treatment and heat preservation, adopting hot water quenching after discharging, and after cooling to room temperature, conducting aging and preserving heat. The magnesium alloy prepared by the solution is good in quality, and has more obvious high tensile strength and high elongation compared with common magnesium alloys in the market.

The invention relates to TiAl-based abrasion-resistant laser cladding coating powder and a preparation method thereof, and belongs to the technical field of laser cladding metal material surface modification. The TiAl-based abrasion-resistant laser cladding coating powder is composed of the following components of, by mass, 60.5%-86.5% of TiAl intermediate alloy powder, 10%-20% of Si powder, 1%-10% of HfO2 powder, 1%-5% of La2O3 powder, 1%-3% of B powder and 0.5%-1.5% of CeO2 powder. A coating which has high hardness and high abrasion resistance and is metallurgically bonded with a substrate is prepared on the titanium alloy substrate.

The invention belongs to the field of welding and particularly relates to moderate-temperature Zr-based brazing filler metal special for Ti2AlNb-based alloy identical or different material brazing anda preparation method and a brazing process of the brazing filler metal. According to weight percentage, the brazing filler metal comprises 5%-30% of Fe, 1%-15% of Nb or 1%-20% of Cu, <=5% of oligoelements including one or two or more of Al, B, Co, Cr, Mn, Mg, Ni, Ag, and Zn, <=2% of microelements including one or two or more of Ti, Hf, V, Ta, Mo, W, Au, Si, Sn, Pd and Ga, and the balance of Zr elements and unavoidable impurity elements. The preparation method of the brazing filler metal comprises the steps that firstly, raw materials are weighed; secondly, mother alloy of the brazing filler metal is smelted; and thirdly, the smelted mother alloy is subjected to quenching melt-spinning, and then the brazing filler metal is obtained. The brazing filler metal is used for brazing according tothe brazing process of 960 DEG C to 1,030 DEG C and 0-120min. Compared with existing brazing filler metal, the prepared brazing filler metal has an appropriate melting point, excellent wettability and high-temperature mechanical properties, and brazing filler metal preparation and the brazing process are simple.

The invention discloses a machining method for improving abrasion and corrosion resistance of a valve. The machining method comprises the following steps that firstly, the valve is arranged in activation liquid to be immersed, then the valve is washed to be neutral, grinding is conducted, then washing is conducted, drying is conducted, and a material A is obtained; secondly, the material A is subjected to sand blasting treatment, and a material B is obtained; thirdly, the material B is subjected to plasma cladding treatment, and a material C is obtained; and fourthly, the material C is subjected to heat treatment. According to the provided machining method for improving abrasion and corrosion resistance of the valve, through process optimization, a plating material and a base body are tightly combined, distribution is uniform, the high temperature resistance, corrosion resistance and creeping resistance of the valve are effectively improved, and the service life of the valve is effectively prolonged.

The invention discloses a method for assisting brazing by a carbon nanotube reinforced type three-dimensional middle layer, and relates to a method for brazing ceramic and metal, which aims at solving the problems of larger residual stress and insufficient high-temperature property in the existing ceramic and metal brazing connection process. The method comprises the following steps of 1, preparing soaked foam metal; 2, putting the soaked foam metal into a plasma reinforced type chemical vapor depositing vacuum device, and increasing temperature at certain pressure and hydrogen atmosphere; 3, preparing nanotube reinforced type foam metal; 4, preparing surface impurity-removed metal, surface impurity-removed brazing material foil and surface impurity-removed ceramic; 5, sequentially overlapping the surface impurity-removed to-be-brazed metal, the carbon nanotube reinforced type foam metal, the surface impurity-removed brazing material foil and the surface impurity-removed ceramic, so as to obtain a to-be-brazed part; brazing the to-be-brazed part, and cooling to room temperature. The method disclosed by the invention is used for assisting the brazing by the carbon nanotube reinforced type three-dimensional middle layer.

The invention belongs to the field of metal materials, and particularly discloses an aluminum alloy compound refining and strengthening agent and a preparing method and device thereof. Firstly, pure aluminum is placed into a smelting furnace crucible to be melted to a certain temperature, the top of an aluminum melt goes beyond an inlet of the upper portion of an electromagnetic circulating devicein the crucible, an aluminum alloy covering agent is added into the top of the crucible, weighing is conducted, preprocessed Ti, B2O3, Zr and C powder or dust is added into a feed port of the electromagnetic circulating device, then the electromagnetic circulating device is started, and the required compound refining and strengthening agent is obtained through a certain period of circulating reacting and compounding. The prepared compound refining and strengthening agent has the advantages of efficient refining of a traditional Al-Ti-B system and long-acting refining of an Al-Ti-C system. Moreover, the compound refining and strengthening agent contains a large amount of sub-micron and nanoscale TiB2, ZrB2, TiC and ZrC reinforcement particles, improves the refining effect and is finally dispersed in an alloy base body to have a dispersion strengthening effect.

The invention relates to a preparation method of a multi-element composite reinforced molybdenum alloy. The preparation method sequentially comprises the following steps that the Mo source, the Ti source, the Zr source, the C source, the Hf source and the Re source are weighed according to a certain weight ratio, the raw materials are prepared and mixed to obtain the uniform molybdenum alloy powder; the molybdenum alloy powder is placed in a mold cavity of a mold and is subjected to compression forming treatment to obtain a forming blank; high-temperature sintering treatment on the formed blank is carried out under vacuum to obtain a sintered blank; forging or rolling deformation processing is carried out on the sintered blank to obtain a forged blank or a rolled blank; and annealing heattreatment on the forged blank or the rolled blank is carried out to obtain the molybdenum alloy plate or a rod material. According to the preparation method, the steps and the process conditions are reasonable in design and good in using effect, the prepared molybdenum alloy material has excellent performance, the tensile strength Ra is greater than or equal to 200 MPa at a high temperature of 1600 DEG C, the percentage elongation after fracture is larger than or equal to 20%, and the oxygen content is less than or equal to 100 ppm.

The invention relates to high-strength weather resisting steel with Cu2-xS dispersed precipitates, which comprises the following chemical components in percentage by weight: 0.04-0.08% of C, 0.20-0.40% of Si, 0.4-1.0% of Mn, 0.03-0.12% of P, not more than 0.2% of S, 0.01-0.06% of Al, 0.20-0.80% of Cu, 0.40-0.6% of Cr, 0.12-0.40% of Ni, 0.001-0.006% of Ca and the balance of Fe and inevitable impurities. The welding cold crack sensitivity coefficient Pcm is not more than 0.18%. A manufacturing method comprises the following steps of: acceleratedly cooling both sides of a cast belt formed by continuous casting by using a gas and adopting a thin belt continuous casting production technology, wherein the cooling rate is 150-200 DEG C / s; performing the entire double-roller continuous casting process in a closed chamber filled with protective atmosphere; and arranging one to two stands for online hot rolling, wherein the thickness of a finished steel belt reaches 0.6-2 mm. The desulfurization procedure in steel making process can be omitted, and the steel making cost is reduced. The segregation of copper elements is inhibited, meanwhile, a large quantity of dispersed Cu2-xS precipitates can be formed to achieve the effect of dispersion strengthening.

The invention discloses an oxide-strengthened low-activation steel, an electroslag remelting slag system and a smelting method. The electroslag remelting slag system includes A slag and B slag, and the components of the A slag include: CaF 2 :40~55 copies, Y 2 o 3 : 30 to 35 parts, CaO: 20 to 30 parts; the composition of the B slag includes CaF 2 : 55-65 parts, CaO: 30-40 parts, MgO: 2-5 parts, SiO 2 : 3 to 7 parts; during smelting, a blind hole is processed inward from the upper end of the consumable electrode, filled with yttrium in the blind hole, the upper end of the consumable electrode is welded to the dummy electrode, and the consumable electrode Fix it at the smelting position, add slag A into the water-cooled crystallizer, and start arcing to make slag; start smelting after arcing, and add B slag after smelting to the designated position of the consumable electrode, and continue smelting until the end. The horizontal position corresponding to the bottom of the blind hole on the consumable electrode. The electroslag remelting slag of the present invention does not contain Al 2 o 3 , The smelting method can make full use of the electroslag remelting system of the present invention, improve the Y yield, and obtain a new oxide-strengthened low-activation steel.

The invention belongs to the field of welding, in particular to a Ti 2 The invention relates to a medium-temperature Zr-based solder special for brazing of the same material or different materials of AlNb-based alloys, a preparation method thereof, and a brazing process. In terms of weight percentage, the composition and content of the solder are: Fe 5% to 30%, Nb 1% to 15% or Cu 1% to 20%, choose one of the two, and a small amount of elements Al, B, Co, Cr , one or more of Mn, Mg, Ni, Ag and Zn≤5%, one or more of trace elements Ti, Hf, V, Ta, Mo, W, Au, Si, Sn, Pd, Ga≤ 2%, the rest is Zr element and unavoidable impurity elements. The preparation method of brazing material: 1. Weighing the raw materials; 2. Melting the master alloy of the brazing material; The brazing material of the present invention is brazed according to the brazing process of 960 DEG C to 1030 DEG C and 0 to 120 minutes. Compared with the existing solder, the brazing filler metal prepared by the invention has suitable melting point, excellent wettability and high-temperature mechanical properties, and the brazing filler metal preparation and brazing process are simple.

The invention belongs to the field of metal materials, and particularly refers to a composite thinning and strengthening agent for aluminum and aluminum alloys, a preparation method and a device. First, put pure aluminum in the crucible of the melting furnace and melt it to a certain temperature, make the top of the aluminum melt exceed the upper entrance of the electromagnetic circulation device in the crucible, and add an aluminum alloy covering agent to the top of the crucible, and put the weighed and pretreated Ti , B 2 o 3 , Zr, C powder or shavings are added from the feeding port of the electromagnetic circulation device, and then the electromagnetic circulation device is started, and after a period of cycle reaction compounding, the required compound refinement and strengthening agent are obtained. The composite thinning and strengthening agent prepared by the present invention not only has the characteristics of traditional Al-Ti-B series high-efficiency thinning and Al-Ti-C series long-term thinning, but also contains a large amount of submicron and nanometer TiB 2 , ZrB 2 , TiC, ZrC reinforcement particles, while improving the refinement effect, are finally dispersed in the alloy matrix to achieve the effect of dispersion strengthening.

The invention belongs to the technical field of ultra-fine dispersed precipitated phase high-strength steel and its preparation method, specifically a low V microalloyed ultra-fine dispersed precipitated phase high-strength steel and its preparation method, which solves the technical problems in the background technology, the preparation method In order to obtain steel slabs after mixing the various element components according to the nominal composition ratio, the smelted steel slabs are then processed by conventional heating furnace process or direct rolling process. After the treatment, the steel ingots cooled to room temperature are heated and heated at a certain temperature Holding for a certain period of time allows V to completely dissolve into the steel ingot, and then cooling at a certain temperature and holding for a certain period of time allows V to be completely precipitated, forming V (C, N) uniformly dispersed and fine precipitates to provide low V microalloyed super Fine dispersed precipitate phase high strength steel. This method exerts the precipitation strengthening effect of the V(C, N) precipitates, so that the precipitates can be uniformly dispersed in the matrix to achieve the effect of dispersion strengthening, and prepare high-strength and high-plasticity high-strength steel.

The invention discloses a Cu-containing high-entropy alloy coating with a liquid phase separation structure and a preparation method thereof, belonging to the field of alloy material design. The invention adds a small amount (mass fraction of 0.5-3%) nanometer Y2O3 to the Cu-containing high-entropy alloy composition, which can promote the laser cladding Cu-containing high-entropy alloy coating to form a liquid phase separation structure. The copper-containing high-entropy alloy is composed of 5 or more metal or non-metallic elements, and the content of the Cu element that must be added accounts for 15-35% of the total moles of the high-entropy alloy components. In the present invention, due to the large surface effect and small size effect of nano-Y2O3, it can promote the separation of liquid phase copper from the alloy melt when the laser cladding copper-containing high-entropy alloy coating is fused, and the in-situ self-generation on the solidified matrix structure of the coating A large number of dispersed copper-rich phase particles change the single-phase structure of the coating, providing a new method for designing multi-phase structures and expanding properties of high-entropy alloys through liquid phase separation.

The invention discloses a high-strength and high-conductivity graphene-copper composite wire and a preparation method thereof, which belong to the technical field of composite material processing and heat treatment. In the graphene-copper composite wire, the graphene content is 0.05-0.8wt.%, the total content of impurity elements is ≤0.1wt.%, and the balance is copper. The high-strength and high-conductivity graphene-copper composite wire prepared by the present invention has uniform graphene Dispersed and oriented distributed in the copper matrix, its tensile strength reaches 330-480MPa, elongation 6%-20%, electrical conductivity 95-105% IACS, and has excellent comprehensive performance.