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

The invention provides a rare earth-containing powder metallurgy natural gas engine valve seat ring. The chemical composition of the valve seat ring comprises, by mass, 0.8-1.5% of C, 10.0-20.0% of Cr, 16.0-22.0% of Mo, 20.0-25.0% of Co, 4.0-9.0% of Ni, 20.0-24.0% of W, 0.1-0.2% of a rare earth element, 0.1-0.2% of a lubricant, 0.1-0.2% of a binder, and the balance Fe, the granularity of Fe is 60-70 meshes, and the rare earth element can be La, Ce or a Ce-rich mixed rare earth. The valve seat ring has the advantages of ideal hardness, high strength, high density, strong deoxidation and desulfurization abilities, heat resistance, corrosion resistance and the like.

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.

The invention provides small-scale finish-rolled twisted steel and a production method thereof. The small-scale finish-rolled twisted steel comprises the following chemical components in percentage by mass: 0.40-0.50% of C, 1.5-1.8% of Si, 0.8-1.0% of Mn, less than or equal to 0.035% of P, less than or equal to 0.035% of S, 0.08-0.13% of V, 0.008-0.01% of Als and the balance of Fe and inevitable impurities. The production method comprises the following steps: desulfurizing molten iron, smelting in a converter, blowing argon, performing protective casting into a square blank of 200*200mm<2>, heating the square blank, rolling, performing controlled cooling after rolling, and performing air-cooling in a cooling bed. The finish-rolled twisted steel provided by the invention is stable in property, and the production method is simple and easy to operate.

The invention discloses an Al-Mg-In system welding wire and a preparing method thereof. The welding wire comprises, by weight, 4.0%-6.5% of Mg, 0.15%-1.0% of In, 0.1%-0.4% of Ce, 0.4%-1.2% of Mn, 0.05%-0.15% of Ti, smaller than or equal to 0.3% of Si, smaller than or equal to 0.2% of Fe, smaller than or equal to 0.0015% of Na, and the balance Al. The preparing method comprises the following steps that an aluminum ingot, a magnesium ingot, an indium ingot, a cerium ingot and Al-10 Mn intermediate alloy are smelted in a medium-frequency induction resistance furnace according to the proportion, a refiner is made through Al-5Ti-B, and an ingot casting is formed through casting; after the ingot casting is evenly annealed, head cropping and face milling are carried out, and a rod-shaped blank is formed through thermal extrusion; and wire drawing is carried out on the rod-shaped blank through a drawing machine, and the Al-Mg-In system welding wire is obtained through surface treatment and coiling. The Al-Mg-In system welding wire has the following advantages that the technology is simple and each to achieve, the spreadability and wettability of the welding wire are good, and the heat crack sensibility is small; the structure of the welding wire is refined, and the forming technology is superior; and compared with base metal, a welding connector has high strength and tenacity matching.

The invention provides a method for continuously casting and rolling high-efficiency forming copper-nickel-silicon alloy strips, comprising the following steps: taking copper source, nickel source and silicon source as raw materials, successively melting, continuous casting, cooling and casting to obtain copper The nickel-silicon alloy slab and the copper-nickel-silicon alloy slab are sequentially rolled, aged, cooled and finished cold rolled to obtain a copper-nickel-silicon alloy strip. The examples show that the copper-nickel-silicon alloy slab with high surface quality and dense columnar grain structure obtained by the present invention has an elongation rate greater than 45% at room temperature and has excellent plasticity; Continuous casting and rapid solidification can effectively improve the solid solution strengthening and precipitation strengthening effects of alloy elements; the invention has a simple process, can effectively reduce energy consumption, reduce costs, and improve production efficiency and product yield.

The invention provides a preparation method for a Cu-Ni-SI-Ma alloy strip. The method comprises the following steps that a copper source, a nickel source, a silicon source and a magnesium source serve as the raw materials and are sequentially subjected to melting, continuous casting, cooling and billet drawing to obtain a Cu-Ni-SI-Ma alloy rod billet; the Cu-Ni-Si-Ma alloy rod billet is directly subjected to continuous extrusion molding to obtain a Cu-Ni-Si-Mg alloy strip billet; and then rolling and ageing treatment are sequentially conducted to obtain the Cu-Ni-Si-Mg alloy strip. Embodiments show that the elongation, under the room temperature, of the Cu-Ni-Si-Mg alloy rod billet prepared through the preparation method is greater than 45%, and excellent plasticity is achieved; and melting and continuous casting in combination of cooling enforcement measures are adopted, continuous casting and fast solidification can be achieved, the solution strengthening and precipitation strengthening effects of alloy elements are effectively improved, and the method for continuous casting, continuous extruding, rolling and efficient molding of the Cu-Ni-Si-Mg alloy strip is provided.

The invention relates to an economic type core rod alloy steel and a preparation and heat treatment method thereof, belongs to the technical field of alloy steel manufacturing process, and is characterized in that the alloy steel comprises the following main alloy elements by mass percentage: 0.25-0.30% of C, 0.10-0.20% of Si, 1.51-1.62% of Mn, 3.60-4.10% of Cr, 0.20-0.30% of Mo, 0.20-0.40% of V, 0.03-0.05% of Nb, and the balance Fe. The alloy steel preparation process comprises the following steps: preparing materials, smelting, casting an electrode rod, and annealing; then carrying out electroslag remelting, and annealing; followed by carrying out multidirectional forging and direct water cooling; then carrying out two-section type annealing; and finally, carrying out quenching and tempering treatment. The properties of the alloy steel are equal to or exceed those of H13 steel under same conditions. The low-alloying-composition design thought of the alloy steel meets a transformation concept that current Chinese steel enterprises are in urgent need of energy saving, consumption reduction, cost reduction and benefit increase.

The invention discloses a high-strength and high-plasticity high-entropy alloy and a preparation method thereof, and belongs to the technical field of metal materials and manufacturing. The high-entropy alloy is prepared from the following raw materials of metal particles of Co, Cr, Fe and Ni and intermediate alloy particles of Al-10Er (the mass fraction of Er is 10%). The preparation method specifically comprises the following steps that the metal particles are weighed according to the set proportion, melted in a high-vacuum electric arc melting furnace and then solidified in a copper mold soas to prepare a high-entropy alloy, wherein in order to ensure the uniformity of alloy components in the smelting process, alloy blocks need to be repeatedly smelted; and the as-cast high-entropy alloy prepared in the initial stage is homogenized in a high-temperature heat treatment furnace, then water quenching is carried out, the high-entropy alloy ingot is rolled at the temperature of 500-800DEG C, and the rolled sample is cooled along with air to obtain the high-strength and high-plasticity high-entropy alloy. The high-entropy alloy prepared by using the preparation method has excellentmechanical properties, and the preparation process is simple.

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 discloses a low-cost high-strength high-ductility rare earth magnesium alloy and a preparation method thereof. The magnesium alloy comprises the following specific components including, by weight, 0.1 to 6.0 percent of Y, 0.1 to 6.0 percent of Gd, 0.1 to 6.0 percent of Sm, 0.01 to 2.0 percent of Zn, 0.01 to 2.0 percent of Sn, 0.01 to 2.0 percent of Bi, 0.01 to 1.0 percent of Sb, 0.1 to 1.0 percent of Zr and the balance Mg and inevitable impurities, wherein the impurity content is less than or equal to 0.1 percent by weight. According to the low-cost high-strength high-ductility rare earth magnesium alloy and the preparation method, by reasonably controlling the contents of cheap rare earth elements including Sm, Y and Gd and non-rare earth elements including Zn, Sn, Bi and Sb in the alloy, precipitation of a magnesium rare earth strengthening phase is promoted, a brand new non-basal precipitated phase and a non-rare earth precipitated phase are formed, and the rare earth content is reduced; and a new process combining high-temperature low-speed extrusion cogging and variable-temperature variable-speed rolling is adopted, grains and a second phase are further refined, and the high-strength and high-ductility rare earth magnesium alloy with the flat and smooth alloy surface is prepared. At the normal temperature, the alloy tensile strength of an alloy plate prepared through the method is larger than or equal to 515 MPa, the yield strength is larger than or equal to 450 MPa, and the ductility is larger than or equal to 10%; and the tensile strength of the alloy at the high temperature of 200 DEG C is larger than or equal to 501 MPa, the yield strength is larger than or equal to 430 MPa, and the ductility is larger than or equal to 12%.

The invention discloses a method for improving high-strength and high-conductivity performances of copper-based high-strength and high-conductivity material. The high-strength and high-conductivity performances are improved by carrying out melt overheating insulation treatment on the copper-based high-strength and high-conductivity alloy material under certain temperature. The method comprises the steps of alloy melting, overheating treatment, cooling and pouring. According to the invention, the melt overheating treatment is introduced into a smelting process of high-strength and high-conductivity copper alloy, and the method of melt overheating insulation treatment under high temperature is adopted to improve the structure of the alloy melt, thereby further influencing and enhancing alloy solidification structure and property. By adopting the method provided by the invention, under the premise of avoiding introducing heterogeneous elements which can lower the conductivity of the alloy, the high-strength and high-conductivity property of the copper alloy can be further improved, and other mechanical properties such as alloy plasticity can also be enhanced to certain degree.

The invention discloses high-strength casting titanium alloy and preparation method thereof. The preparation method comprises the following steps that titanium sponge, aluminum shots, aluminum-molybdenum alloy, niobium-titanium alloy, sponge zirconium, titanium-tin alloy and metal chromium are mixed according to the mass percentage of 5.2%-6.8% of Al, 1.6%-2.5% of Sn, 1.6%-2.5% Zr, 2.2%-4.0% of Mo, 0.8%-2.3% of Nb, 0.8%-2.2% of Cr, 0.1%-0.4% of Fe, less than or equal to 0.20% of O, less than or equal to 0.08% C, less than or equal to 0.05% N, less than or equal to 0.015% of H and the balance titanium, and are pressed to be made into strip-shaped electrode blocks; the pressed electrode blocks are assembled and welded into a strip-shaped electrode; the strip-shaped electrode is forged into acasting mother alloy electrode after smelting; and casting is performed, heat treatment is performed on the casting, and the high-strength casting titanium alloy is obtained. The high-strength casting titanium alloy is excellent in mechanical property, and can meet the high strength requirements of industrial complex structural parts for aviation equipment, aerospace equipment, weapon equipment and other equipment.

The invention provides a high-strength aerial cable, comprising a conductor, and an insulating layer. The conductor is made of high-strength aluminium alloy. The aluminium alloy conductor is in a cylindrical shape. A complex fiber core comprises carbon fiber filaments and fiber glass filaments. An insulating film wraps outside the conductor, and then the complex fiber core is winded on the periphery of the conductor, and finally, a protective coating is extruded on the periphery of the complex fiber core and the conductor. The protective coating is made of duplex-polyvinyl chloride. First, proper amount of Cr, Cu, and Mg is added in the aluminium alloy, solution strength of the aluminium alloy is increased, so strength of the aluminium alloy, especially tensile strength of the aluminium alloy are substantially improved. In addition, on the periphery of the conductor is the complex fiber core, so tensile strength of the cable is greatly increased. Moreover, the outermost layer uses the duplex-polyvinyl chloride, so tensile strength of the cable is enhanced to a certain extent.

The invention relates to a method for refining Mn-containing Mg-Zn-Al series cast magnesium alloy grains, and belongs to the field of Mg-Zn-Al series cast magnesium alloy preparation. The preparation method comprises the following steps: preheating raw materials, putting metal Mg, metal Al, metal Zn, metal Cu and Mg-5wt.% Mn intermediate alloy into a smelting furnace, introducing protective gas, smelting at the temperature of 720-760 DEG C until the metal is completely molten, and keeping the temperature for 10-15 minutes to obtain an alloy melt A; adding dry magnesium carbonate powder into the alloy melt A, uniformly stirring, slagging, and standing for 10-20 minutes to obtain a grain refined alloy melt B; an RJ-6 refining agent is adopted for conducting purification and refining treatment on the alloy melt B obtained after grain refinement for 5-10 min, the temperature of the melt is adjusted to 720-740 DEG C after slagging-off treatment, standing is conducted for 20-40 min, and a refined alloy melt C is obtained; pouring the refined alloy melt C into a preheating mold, demolding, and cooling to room temperature in air to obtain an alloy ingot; and the alloy ingot is subjected to solid solution-two-stage aging treatment to obtain the magnesium alloy ingot. Cast magnesium alloy grains are refined through magnesium carbonate, and the magnesium alloy is high in yield strength and good in plasticity after heat treatment.