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

The invention provides a magnesium alloy for die-casting that can improve the high-temperature creep performance without reducing the strength at room temperature, and a magnesium die-cast product using the alloy. Manufacture of magnesium die-casting products using a magnesium alloy for die-casting, wherein the magnesium alloy for die-casting is an AZ91 series alloy of 6.0 to 11.0% by weight of aluminum, 0.1 to 2.5% by weight of zinc, and 0.1 to 0.5% by weight of manganese, and added silicon: 0.1 to 1.5% by weight 1. At least one of misch metal containing rare earth elements: 0.1-1.2% by weight, zirconium: 0.2-0.8% by weight, made into an AZ91-based matrix alloy, and adding 0.1-1.5% by weight of antimony to the AZ91-based matrix alloy and at least one of 0.05 to 3.5% by weight of calcium, and 0.1 to 2.5% by weight of strontium, and other components are unavoidable components.

The invention discloses a liquid metal corrosion-resistant high-chromium martensitic heat-resistant steel, which belongs to the field of heat-resistant metal materials. It is characterized in that the weight percentage (wt.%) of the alloy composition is: 0.18%≤C≤0.26%, 1.0%<Si≤1.5%, 10%<Cr≤11.5%, 1.0%<W≤1.5%, 0%< Mn<1.0%, Ta+Nb: ≤0.3%, 0%<V≤0.2%, the balance is iron. The beneficial effect of the present invention is that the liquid metal corrosion resistance is improved by adopting a more reasonable high silicon and high chromium content, and the generation of δ ferrite is suppressed by adjusting the content of carbon, manganese and other elements to obtain a full The martensitic structure improves the strength and toughness, and the microalloying elements such as tantalum, niobium and vanadium are used for composite strengthening to improve the high-temperature creep performance, so that the heat-resistant steel has excellent strength and toughness, high-temperature creep performance and liquid metal corrosion resistance. .

The invention relates to a brick with high thermal shock resistance and low creep for a hot blast stove and a manufacturing method thereof, belonging to the technical field of refractory materials. It is characterized in that the parts by weight are: 19-27 parts of 3-1mm bauxite, 11-14 parts of 1-0.5mm brown corundum, 8-12 parts of brown corundum with a particle size of <320 mesh, 10-20 parts of 3-1mm andalusite Parts, 9~16 parts of andalusite 0.5‑0.1mm, 14~23 parts of andalusite with particle size<200 mesh, 4.5~7.5 parts of alumina micropowder with particle size<5μm, 5~8 parts of Suzhou soil with particle size<0.045mm, Particle size <240 mesh silicon carbide 4.5~5.5 parts, pulp 3.5~4.5 parts, phosphoric acid 0.2~0.5 parts, dextrin 0.3~0.7 parts, sodium tripolyphosphate 0.1~0.2 parts. The invention introduces silicon carbide and andalusite and brown corundum of specific particle size, on the basis of improving the load softening temperature and high temperature creep performance of fire bricks, the thermal shock resistance stability of the product is improved, and as a refractory material for hot blast stoves, it can Significantly extend its service life.

The invention discloses a processing method for improving the high-temperature creep performance of a magnesium alloy through rolling and pre-compression, which is characterized in that the mass percentage composition of the magnesium alloy is: Al: 8.5%-9.5%, Zn: 0.45%-0.90%, Mn : 0.15%~0.4%, Y: 0.3%~0.8%, and the rest are magnesium and impurity elements that cannot be removed; the processing method includes the following steps: 1) performing solid solution treatment on magnesium alloy; The magnesium alloy is rolled, the rolling temperature is 300~400°C, the rolling speed is 0.2m / s-0.6m / s, the number of rolling passes is 3-8 times, and the total deformation is 50%-80%; 3) Perform pre-compression deformation on the rolled magnesium alloy, the pre-compression direction is perpendicular to the rolling plate surface, the pre-compression temperature is 20°C-100°C, the compressive strain is 0.01-0.02, and the strain rate is 1×10 ‑4 the s ‑1 -2×10 ‑4 the s ‑1 , and keep the compression deformation for more than 5min. The invention adjusts the microstructure of the magnesium alloy so that the magnesium alloy undergoes creep dynamic precipitation during the high-temperature creep process, and the creep dynamic precipitation phase improves the thermal stability of the material and improves the high-temperature creep performance.

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 provides a Sn-Cu based lead-free solder alloy which improves the creep performance of solder joints. The content of Cu in the solder alloy is 0.7 wt%, the content of Co is 0.5-0.05 wt%, and the content of Ni is 0.25 wt%. -0.025wt%, the content of P is 0.05-0.005wt%, and the balance is Sn. At the same time, a preparation process for making the above-mentioned lead-free solder alloy is also provided. The effect of the present invention is that by adding trace amounts of Co, Ni and P elements to the Sn-0.7Cu eutectic solder, the morphology of the interface compound is effectively improved, the supercooling degree of the alloy is reduced, and the oxidation resistance is improved. Furthermore, the growth of the interfacial compound layer Cu6Sn5 and the appearance of the brittle compound Cu3Sn on the side of the Cu substrate are suppressed in a high-temperature environment, thereby improving the high-temperature creep resistance of the welded joint. The alloy can be widely used in wave soldering and manual soldering processes in the field of electronic assembly.

The invention discloses an in-situ method for synthesizing a dispersion-strengthened alloy of nanometer oxide particles, which comprises the following steps: (1) designing the alloy so that the alloy contains elements capable of forming oxides; During the preparation process, the oxygen content in the alloy powder is increased; (3) using metal additive manufacturing technology, the oxide-forming elements and oxygen elements are combined to form dispersed nano-oxide particles during the localized solidification process of the alloy, and the obtained Nano-oxide particle dispersion strengthened alloy. This method can reduce the process and cycle of preparing nano-oxide dispersion strengthened alloys, realize in-situ precipitation of nano-oxide particles and evenly distribute them in the alloy matrix, and at the same time, can prepare columnar crystal structure in situ to ensure that in the subsequent heat treatment process No pores will be formed.

The invention provides a heat-resistant steel for the key hot end parts of an ultra-high parameter steam turbine, which contains: C: 0.02-0.08, Cr: 8.00-10.00, Co: 2.0-4.0, W: 2.0 in weight percentage ~4.0, Mo: 0.10~0.80, V: 0.10~0.30, Ni: 0.30~0.70, Nb: 0.05~0.15, N: 0.010~0.050, B: 0.010~0.030, rare earth elements: 0.1~1.0, Si: ≤0.10 , Mn: 0.10 ~ 1.00, the balance consists of Fe and unavoidable impurities. The heat-resistant steel belongs to martensitic heat-resistant steel and has good high-temperature performance and oxidation resistance, thereby improving the temperature parameter of the steam turbine and helping to improve the power generation efficiency of the steam turbine.