4results about How to "Achieve solid solution strengthening" patented technology

The invention discloses a 900MPa-grade ultra-fine grain steel material, which contains Fe and inevitable impurities, and further contains the following chemical elements in percentage by mass: 0.20 to 0.28 percent of C, 0.15 to 0.35 percent of Si, 0.90 to 1.40 percent of Mn, 0.80 to 1.30 percent of Cr, 0.30 to 0.65 percent of Mo, 0.86 to 1.25 percent of Ni, 0.01 to 0.08 percent of Nb, 0.015 to 0.05 percent of Al and the balance of Fe and inevitable impurities. In addition, the mass percentage content of each chemical element meets the following conditions: (Mn + Ni) / C is more than or equal to 6 and less than or equal to 12; and 4 < = (Cr + Mo) / C < = 8. Correspondingly, the invention further provides a manufacturing method of the 900 MPa grade ultra-fine grain steel. The yield ratio of the steel is controllable, high strength is guaranteed, and meanwhile good low-temperature toughness and ductility are achieved.

The application discloses a high-pressure die-casting motor rotor casting aluminum alloy and a preparation method thereof, and belongs to the technical field of motor rotor materials. The high-pressure die-casting motor rotor casting aluminum alloy comprises the following components in percentage by mass: Mg 0.75-0.85 wt%, Fe 0.15-0.25 wt%, Ti≤0.03 wt%, Ga≤0.03 wt%, Zn≤0.03 wt%, Cu≤0.03 wt%, Mn≤0.01 wt%, Si≤0.01 wt%, other impurities≤0.35 wt%, and the balance of Al. The type of elements and the percentage by mass of each element are specifically limited, the percentage by mass of Si is reduced, the influence of Si on the electrical conductivity of the aluminum alloy is reduced, the electrical conductivity of the aluminum alloy is improved to a certain extent, the percentage by mass of Mg and Fe is limited, Mg forms a solid solution in Al, Fe interacts with Al to form phases such as Al3Fe, and the strength and hardness of the aluminum alloy are improved, so that the balance between the mechanical properties and the electrical conductivity of the motor rotor casting aluminum alloy is achieved.

The application discloses a composite reinforced tungsten wire base material and a preparation method thereof, and the composite reinforcement is realized through integrated reinforcement of fine-grain reinforcement, solid solution reinforcement and second-phase reinforcement. The fine-grain reinforcement is realized through high and low two-stage sintering processes based on high grain boundary migration activation energy inflection point temperature and nanometer dispersion phase grain growth inhibition synergy of a base phase; the solid solution reinforcement is realized through tungsten-molybdenum solid solution formation; and the second-phase reinforcement is realized through zirconium-containing nanometer dispersion phase and rare earth oxide nanometer dispersion phase synergy. The nanometer dispersion phase in the tungsten wire base material has a particle size of less than 50 nm, the tungsten-molybdenum solid solution base phase has a grain size of less than 1 micrometer, and the tungsten wire base material has the remarkable characteristics of high wire drawing production efficiency, high product yield, high wire strength and low production cost.

The present invention discloses a renewable heat-treatment-free integrated die-cast aluminum alloy and a preparation method thereof, belonging to the technical field of aluminum alloy materials. The weight percentage of each component in the die-cast aluminum alloy is Mg: 5.0-8.0%, Si: 2.0-3.8%, Mn: 1.0-1.5%, Zn: 0.1-0.5%, Be: 0.003-0.005%, Nb: 0.02-0.08%, Ti: 0.0175-0.07%, Mo: 0.005-0.02%, Fe<0.2%, the total amount of other impurities is ≤0.5%, and the balance is Al. The die-cast aluminum alloy phase includes a matrix α-Al solid solution, Mg 2 Si and BCC phase, BCC phase is evenly distributed in the grain boundary area of ​​die-cast aluminum alloy, the high melting point BCC phase has a hydrogen adsorption capacity of >150ml / g in the temperature range of 20-700℃, and it does not melt when heated to 1980℃ and kept for 2h, the hydrogen content of aluminum liquid is ≤0.05ml / 100g Al, and the slag content is ≤0.01mm 2 / kg, the obtained heat-treatment-free integrated die-casting aluminum alloy has high resistance to hydrogen embrittlement and excellent strength and toughness.