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Reinforced steel is widely used as a high-strength material in the construction field. "Stronger than steel" has even become a common reference characteristic for materials in the field of space exploration.
Scientists from Carolina State University have recently used new manufacturing processes to create steel bars that are “stronger than steelâ€. They improve the toughness of the metal and improve it by improving the internal structure of the steel bars. The inspiration for this improvement is The structure comes from bamboo and bones.
Researchers imitate the structure of bamboo and bones. This architecture will compress the millions of tightly packed crystals that make up the metal, adjust the ratio of strength and weight, and increase the strength and toughness of the metal. Wu Xiaolei, a professor at the Chinese Academy of Social Sciences who participated in the research activity, said: "Smaller crystals can make metals harder, and they can also achieve better ductility."
According to the results of the research, the steel bars before the improvement can withstand a pressure of 450 MPa on the basis of very low ductility, which means that the steel bars can reduce the extension distance by 5% before the fracture, and the steel bars can withstand the pressure of 500 MPa after the improvement. And before the fracture can reach 20% or more in length.
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