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In this study, a certain amount of Cu was added into tentative steel to introduce novel Cu-rich nanoprecipitates, thus enhancing strength yet without sacrificing toughness. This type of precipitates was quite different from previous ε-Cu, and was a novel type of Cu-rich nanoprecipitates, which contained more than 50% Cu. The microstructure, mechanical properties and precipitates of the steels aged at 550 °C for different holding times and were carefully examined. The microstructure of the tested steel was mainly bainite and gradually evolved into equilibrium state after aging. Mechanical properties results showed that after being aged at 550 °C for 10 min, the steel can have an excellent mechanical property combination of strength and toughness. In addition, a large amount of tiny precipitates was uniformly distributed in the matrix of the aging steels, and their size kept at nanoscale. In particular, when the steel was aged at 550 °C for 10 min, it produced the largest number of tiny precipitates of this type. This type of Cu-rich nanoprecipitates emerging from the steel aged at 550 °C for 10 min also brought about a remarkable antibacterial property. It revealed that novel Cu-rich precipitates not only have positive effects on strength and toughness, but also played an important role in antibacterial properties.

Novel Cu-Rich Nano-Precipitates Strengthening Steel with Excellent Antibacterial Performance