42results about How to "Improve high temperature creep performance" patented technology

The invention discloses a novel nickel-chromium-iron electrothermal alloy. The novel nickel-chromium-iron electrothermal alloy is prepared from, by mass percent, 0.7%-1.6% of Si, 0.3%-0.6% of Mn, 20%-23% of Cr, 41%-43% of Ni and the balance iron and inevitable microelements. According to the alloy, due to the fact that the low-price and low-density iron element is adopted for replacing a high-price and high-density nickel element, compared with an original Cr20Ni80 alloy, the novel nickel-chromium-iron electrothermal alloy is low in density and low in price, plastic machinability, weldability, high-temperature mechanical performance, the service life and other main performance indexes remain unchanged, and the Cr20Ni80 alloy can be completely replaced.

The invention provides novel heat-resistant steel for a key hot end part of an ultrahigh-parameter steam turbine. The novel heat-resistant steel is prepared from the components in percentage by weight: 0.02-0.08% of C, 8.00-10.00% of Cr, 2.0-4.0% of Co, 2.0-4.0% of W, 0.10-0.80% of Mo, 0.10-0.30% of V, 0.30-0.70% of Ni, 0.05-0.15% of Nb, 0.010-0.050% of N, 0.010-0.030% of B, 0.1-1.0% of rare earthelements, no more than 0.10% of Si, 0.10-1.00% of Mn, and the balance of Fe and inevitable impurities. The novel heat-resistant steel belongs to martensitic heat-resistant steel and has the good high-temperature property and oxidation resistance property, thus temperature parameters of the steam turbine are increased, and the power generating efficiency of the steam turbine is improved advantageously.

The present invention relates to a magnesium alloy base composite material, and is characterized by that it is a reinforced composite material obtained by making TiB2 granules be dispersed and uniformly distributed in the magnesium alloy base body. Its preparation includes the following processes: preparing reaction prefabricated block, preparing intermediate phase carrier containing reinforcement granules, dissolving and diffusing the intermediate phase carrier in magnesium alloy base body and dispersing and distributing the reinforcement granules in the magnesium alloy base body. Said composite material has good comprehensive performance, so that it has extensive application range.

The invention discloses a liquid metal corrosion-resistant high-chromium martensite heatproof steel, and belongs to the field of heatproof metal materials. The steel comprises 0.18-0.26wt% of C, 1.0-1.5wt% (not including 1.0%) of Si, 10-11.5wt% (not including 10%) of Cr, 1.0-1.5wt% (not including 1.0%) of W, 0-1.0wt% (not including 0 or 1.0%) of Mn, 0.3wt% or less of Ta + Tb, 0-0.2wt% ((not including 0%) of V, and the balance of Fe. The reasonable high silicon and high chromium content is adopted to improve the liquid metal corrosion resistance, C, Mn and other elements are greatly adjusted to inhibit the generation of delta ferrite in order to improve the strength and toughness of a fully martensitic structure, and tantalum, niobium, vanadium and other micro alloying elements are adopted to carry out composite reinforcement in order to improve the high temperature creep resistance, so the heatproof steel has excellent strength and toughness, high temperature creep resistance and liquid metal corrosion resistance.

The invention provides a copper alloy material and a preparation method and application thereof, and belongs to the technical field of additive manufacturing. The copper alloy material is prepared from the following components in percentage by mass: 2.0%-7.0% of Cr, 1.0%-5.0% of Nb, 0.1%-2.0% of Ag, 0.1%-0.7% of Zr, 0.02%-0.3% of RE and the balance of Cu; and the RE is prepared from the followingcomponents in percentage by mass: 88%-93% of La, 6%-9% of Ce, 1.5%-1.9% of Pr and less than or equal to 0.3% of Nd, and the sum of the mass percent is 100%. According to the copper alloy material, through the synergistic effect of RE, Cr, Nb, Ag, Zr and Cu, the heat-conducting property, high-temperature creep property, high-temperature strength and high-temperature fatigue of the copper alloy material are effectively improved, and the problem that in the prior art, the high-temperature mechanical property of the copper alloy material is poor is solved.

The invention discloses an aluminum alloy wire harness for a light automobile. The aluminum alloy wire harness for the light automobile comprises a conductor wire core and an outer layer insulating layer, wherein the conductor wire core comprises the following components of 0.2wt%-0.4wt% of V, 0.01wt%-0.3wt% of Cu+Mg, 0.001wt%-0.01wt% of Sb, 0.01wt%-0.05wt% of Ti, 0.001wt%-0.002wt% of Ag+F, 0.001wt%-0.003wt% of Zr, 0.1wt%-0.3wt% of RE, and the balance is Al; the alloy does not contain Si and Fe; Ce and La are 50% of the total amount of the RE or more; and in a wire drawing process, the conductor wire core is firstly subject to dipping in a mixed solution of potassium fluoborate and polydimethylsiloxane, intermediate annealing in a nitrogen atmosphere containing 5% oxygen concentration is carried out, and then wire drawing is carried out. According to the aluminum alloy wire harness and the preparation method, V, Ti, Ag, F and Zr are adopted as reinforcing systems and secondary smeltingis adopted, so that the elongation at break and the tensile strength of the aluminum alloy wire harness for the light automobile are improved.

The invention discloses a pre-deformed magnesium alloy. The pre-deformed magnesium alloy comprises the following components in percentage by mass: 8.5%-9.5% of Al, 0.45%-0.90% of Zn, 0.15%-0.4% of Mn, 0.3%-0.8% of Y and the balance of magnesium and non-removable impurity elements. The magnesium alloy is obtained after being treated by a solution treatment process, a preferred orientation processing process and a twin crystal pre-deformation process in sequence, and twin crystals exist in more than 40% of crystal grains in a microscopic structure of the magnesium alloy. The invention further relates to a processing method of the pre-deformed magnesium alloy. According to the pre-deformed magnesium alloy and the processing method thereof, by regulating and controlling the magnesium alloy structure, the magnesium alloy is subjected to creep dynamic precipitation in the high-temperature creep process, the thermal stability of the material is improved through the creep dynamic precipitation phase, the creep loading range is expanded, and the creep resistance of the material is improved; and the magnesium alloy is simple in processing process, low in equipment requirement, easy and convenient to operate, relatively low in cost and high in production efficiency. Application and popularization of the magnesium alloy have important significance.

The invention relates to a steel and iron smelting technology, in particular to a cold-pressed steel plate for an automotive axle housing and a production method of the cold-pressed steel plate. The cold-pressed steel plate for the automotive axle housing comprises, by mass percentage, 0.10%-0.16% of C, 0.30%-0.45% of Si, 1.45%-1.60% of Mn, smaller than or equal to 0.15% of P, smaller than or equal to 0.005% of S, 0.045%-0.060% of V, 0.015%-0.030% of Nb, 0.025%-0.050% of Als and the balance Fe. According to the cold-pressed steel plate for the automotive axle housing and the production method, a trace of V elements and a trace of Nb elements are added to ordinary carbon structural steel, and the content of P elements and the content of S elements are reduced, so that the rolling and cooling technology is appropriately changed to improve the strength of the steel plate, and the cold forming performance of the steel plate is improved. By means of the element design and the design of the production technology process, various performance indexes of the steel plate are guaranteed, and the indexes, such as mechanical properties including the stretching property and the impact property, and the ultrasonic flaw detection index, of the steel plate are better than those of similar products.

The invention discloses a ferrite steel plate with a heterogeneous structure and a preparation method of the ferrite steel plate, and belongs to the technical field of steel plate preparation. According to the preparation method, coarse grains and fine grains are reasonably mixed through resurfacing welding, rolling and annealing, so that the problem that the plasticity of an existing steel plateis relatively poor is solved, the strength of the plate is guaranteed, and finally the toughness of the steel plate is guaranteed. The preparation method is simple, the processing efficiency is improved, the cost is saved, and the microscopic structure and the macroscopic mechanical property of a workpiece are effectively regulated and controlled.

The invention discloses a composite brazing aluminum sheet/foil core material alloy for an intercooler and a preparation method of the core material alloy. The core material alloy consists of the following components in percentage by weight: 0.12-0.46% of iron, 0.01-0.25% of silicon, 0.45-1.4% of manganese, 0.04-0.5% of copper, 0.1-0.21% of magnesium, 0.05-0.2% of zirconium, 0.01-0.4% of ytterbium and the balance of aluminum. The preparation method of the core material alloy mainly comprises the steps of 1. smelting, stirring, purifying and keeping all alloys except for aluminum-ytterbium alloy; 2. adding aluminum-ytterbium alloy, stirring, standing by, and casting molten aluminum into a core material aluminum alloy sheet; and 3. homogenizing the core material aluminum alloy sheet, preserving heat, discharging the core material aluminum alloy sheet out of furnace, air-cooling, and implementing surface treatment. The core material alloy disclosed by the invention has the advantages of being effective to inhibit erosion of molten solder and obvious to improve high-temperature creep performance of aluminum alloy; and the method disclosed by the invention is simple and easy to implement, and applicable to industrial production.

The invention provides an Al-Cu-Sr-RE-Ge aluminium alloy wire for a power cable and a preparation method thereof. The Al-Cu-Sr-RE-Ge aluminium alloy wire comprises the following components: 0.4-0.8wt%of Cu, 0.15-0.36wt% of Sr, 0.12-0.32wt% of RE, 0.13-0.28wt% of Ge, 0.11-0.18wt% of Si, 0.02-0.09wt% of Co, 0.03-0.07wt% of Ca, 0.01-0.05wt% of Cr and the balance of Al and unavoidable impurities. Thepreparation method comprises the following steps: 1, smelting and pouring; 2, quenching at 505-520 DEG C, and carrying out aging treatment at 210-225 DEG C; 3, extruding into an aluminium alloy rod at 485-510 DEG C; 4, drawing into a first aluminium alloy wire at 290-310 DEG C; 5, drawing into a second aluminium alloy wire with the diameter of 1-2.5mm at 330-360 DEG C; and 6, carrying out thermalinsulation on the second aluminium alloy wire for 3-5 hours at 350-380 DEG C, then reducing the temperature to 230-260 DEG C, carrying out thermal insulation for 6-10 hours, and air cooling to the room temperature. The Al-Cu-Sr-RE-Ge aluminium alloy wire has excellent electric conductivity and heat resistance and is high in strength, toughness and fatigue resistance.

The invention provides a technological method for improving the high temperature creep resistant property of heat-resistant 403Nb blade steel, and belongs to the technical field of metallurgy materials. The method comprises the following steps that 1, the heat-resistant 403Nb blade steel is subjected to temperature homogenization according to two-stage heating; 2, primary thermal deformation treatment is conducted; 3, secondary thermal deformation treatment is conducted; 4, tempering treatment is conducted. According to the technological method for improving the high temperature creep resistant property of the heat-resistant 403Nb blade steel, on the basis that chemical components of existing heat-resistant 403Nb blade steel are not changed, a change of the structure state is achieved only through minor adjustment of the production technology, the purpose of improving the high-temperature mechanical property is achieved, and particularly, the high temperature creep resistant property is greatly improved; shapes of processing materials or finished products are not limited, no special requirement on applied forming methods exists, and the processing methods such as rolling, extruding and forging for bars, boards, pipes and the like can be implemented according to the technological method.

The invention discloses a processing method for improving the high-temperature creep property of a magnesium alloy through rolling and hammering. The magnesium alloy comprises, by mass, 8.5%-9.5% of Al, 0.45%-0.90% of Zn, 0.15%-0.4% of Mn and 0.3%-0.8% of Y. The processing method comprises the following steps: (1) solution treatment is carried out on the magnesium alloy; (2) the magnesium alloy in the solid solution state is rolled, specifically, the rolling temperature ranges from 300 DEG C to 400 DEG C, the rolling speed ranges from 0.2 m/s to 0.6 m/s, the number of passes of rolling is 3-8, and the total deformation ranges from 50% to 80%; and (3) the magnesium alloy in the rolled state is hammered through an air hammer, specifically, the hammering direction is perpendicular to the plate face of a rolled plate, the hammering temperature is the room temperature, the hammering frequency is 1-4 times, the accumulated hammering strain is 1-3%, and the speed of a hammer before making contact with the magnesium alloy is 1-40 m/s. By regulating and controlling the magnesium alloy structure, the magnesium alloy is subjected to creep dynamic precipitation in the high-temperature creep process, the thermal stability of the material is improved through the creep dynamic precipitation phase, the high-temperature creep performance is improved, and the method has important significance on application and popularization of the magnesium alloy.