5results about How to "High nodularity" patented technology

This invention discloses a casting process for high-strength ductile iron, relating to the technical field of cast iron materials and casting processes. The process includes the following steps: S1, preparing a sand mold, and sequentially forming a sulfur-blocking layer, a diffusion-regulating layer, and a slow-release post-inoculation layer on the surface of the mold cavity to obtain a mold with a gradient reaction coating; S2, melting the base iron, and subjecting the base iron to spheroidization treatment and a primary inoculation treatment to obtain spheroidized iron to be poured; S3, pouring the spheroidized iron to be poured into the mold with the gradient reaction coating, allowing the slow-release post-inoculation layer to contact the spheroidized iron to be poured and release interfacial inoculation active particles; the surface coating of the mold is designed as a gradient structure of a sulfur-blocking layer, a diffusion-regulating layer, and a slow-release post-inoculation layer, so that sulfur blocking, diffusion blocking, and interfacial post-inoculation are spatially partitioned and temporally coordinated, avoiding premature reaction and inoculation failure caused by simple mixing of sulfur-blocking powder and inoculator.

The application belongs to the technical field of nodular cast iron, and particularly relates to a novel nodular cast iron and a preparation method and application thereof. The novel nodular cast iron has the following element composition and mass percentage: C 3.75-3.90%, Si 2.00-2.20%, Mn≤0.10%, Mg 0.035-0.055%, RE≤0.008%, P≤0.02%, S≤0.01%, Cu 0.1-2.0%, Mo≤0.02%, Ni 1.0-2.0%, Sn≤0.05%, Ti≤0.01%, V≤0.02%, B≤0.0008%, Sb 0.003-0.007%, Cr≤0.05% and the balance of Fe; and is composed of 45-55% pearlite and 45-55% ferrite. By controlling the element content in the nodular cast iron and combining with an efficient preparation method, the nodular cast iron with a pearlite content of 45-55% and a spheroidization rate of greater than 95% is obtained, and the nodular cast iron exhibits high strength, high plasticity and a relatively high low-temperature impact value.

The utility model discloses a spheroidizing shaper for graphite, which belongs to the field of graphite spheroidizing and comprises an equipment main body, a driving motor is arranged at the bottom of the equipment main body, and an output shaft of the driving motor is fixedly connected with a rotating shaft; through the arrangement of the spheroidizing assembly, three acting forces of inclined collision, curved surface rolling and reverse shearing are realized, the graphite particles are subjected to curved surface rolling force in the moving process through volute grooves formed in a grinding disc and a base disc and auxiliary teeth on a rotating disc, and spheroidizing of the particles is further promoted; when the spheroidizing device is used for spheroidizing the graphite particles, the particles are subjected to reverse shearing force between the spheroidizing device and the spheroidizing device, the force is beneficial to eliminating burrs and unevenness on the surfaces of the particles, the spheroidized graphite particles are smoother and more round, efficient spheroidizing of the graphite particles is achieved through the synergistic effect of the triple acting force, the spheroidizing rate and the spheroidizing quality are remarkably improved, the number of times of repeated machining is reduced, and the spheroidizing efficiency is improved. And the production cost is reduced.

This invention belongs to the field of metallic materials technology, specifically a single-phase TiZrMo spherical refractory high-entropy alloy powder and its preparation method. The refractory high-entropy alloy powder is composed of any two of Al, Cr, and Nb, and Ti, Zr, and Mo. The atomic radius difference of the refractory high-entropy alloy powder is ≤6.5%, the alloy entropy enthalpy ratio Ω is ≥1.4, and the mixing enthalpy ΔH is... mix The energy density is -20.27 to -3.27 kJ / mol, and the vacancy electron concentration (VEC) is <4.96. Furthermore, the preparation method of this invention has the advantages of simple steps, easy composition control, high production efficiency, and near-net-shape forming. The prepared spherical single-phase BCC refractory high-entropy alloy powder has a high sphericity, smooth surface, and low cost. The high-entropy alloy bulk prepared from this powder has stable microstructure and properties, and its density (2.70–10.22 g / cm³) can be adjusted within a wide range. 3 It possesses both good plasticity (compressive fracture strain ≥10.0%) and strength (compressive strength ≥965MPa), making it suitable for large-scale industrial applications.

The application discloses a nodular cast iron hydraulic motor shell blank casting process, which comprises the following steps: step one, placing a mold core into a half mold box above a base and in contact with a mold cavity block, and then closing two mold boxes; step two, melting raw material iron, and adding a spheroidizing agent into the molten iron and mixing it evenly when the iron block is converted into the molten iron. By adding the spheroidizing agent into the molten iron during casting, the spheroidizing degree of the nodular cast iron in the casting can be improved through the spheroidizing agent, and during the casting process, an electromagnetic heating pipe can be additionally arranged outside the casting pipe to perform secondary heating on the molten iron during the casting, so that the problem that the ductility and toughness of the hydraulic motor shell are reduced due to the increase of the proportion of lamellar cementite in the casting caused by the decrease of the temperature of the molten iron during the casting can be effectively avoided.