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A Novel Design to Enhance the Mechanical Properties in Cu-Bearing Antibacterial Stainless Steel

1
Institute of Advanced Materials, North China Electric Power University, Beijing, 102206, China
2
Materials Engineering, Purdue University, West Lafayette, IN 47907, USA
3
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
4
Collaborative Innovation Center of steel Technology, University of Science and Technology Beijing, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(2), 403; https://doi.org/10.3390/ma13020403
Received: 20 December 2019 / Revised: 9 January 2020 / Accepted: 14 January 2020 / Published: 15 January 2020
A novel method based on nano-scale precipitation hardening has been studied to strengthen copper-bearing ferrite antibacterial stainless steel. Bimodal precipitations can be observed after antibacterial annealing and low temperature aging treatment, which are large rod-shaped precipitates and nano-sized spherical precipitates, respectively. Due to two different morphological precipitates, the strength of the material is significantly improved without sacrificing formability, and at the same time, the excellent antibacterial properties remain. Under low temperature aging treatment, there is no obvious evidence to show the segregation at the interface between the rod-shaped copper precipitation and the matrix due to the low segregation coefficient of copper. The nano-sized copper precipitation uniformly nucleated and distributed on the matrix. The optimized heat treatment process is antibacterial annealing at 800 °C for half an hour followed by one-hour-aging treatment at 550 °C.
Keywords: copper precipitation; bimodal precipitations; hardness; ferritic antibacterial stainless steel copper precipitation; bimodal precipitations; hardness; ferritic antibacterial stainless steel
MDPI and ACS Style

Sun, S.; Xue, Z.; An, L.; Chen, X.; Liu, Y. A Novel Design to Enhance the Mechanical Properties in Cu-Bearing Antibacterial Stainless Steel. Materials 2020, 13, 403.

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