Acta Metallurgica Sinica (English Letters) >
Antibacterial Property and Precipitation Behavior of Ag-Added 304 Austenitic Stainless Steel
Received date: 2014-05-04
Revised date: 2014-05-15
Online published: 2014-07-18
A 304 stainless steel with the addition of 0.27 wt% Ag was found to exhibit excellent antibacterial properties. Based on Thermo-Calc calculation, a special heat treatment was introduced to obtain Ag precipitate in this steel. Antibacterial experiments show that the alloy can kill the adhering Escherichia coli effectively. Since the Ag element plays a key role in killing the adhered bacteria, microstructures of Ag and Ag-rich compounds were characterized by scanning electron microscopy and transmission electron microscopy. Ag-rich compounds with the size of a few microns were found to be embedded within the matrix and along grain boundaries, Moreover, pure Ag particles with a lattice parameter of 0.422 nm were found within the austenite matrix. The orientation relationship between the matrix and Ag particles was identified. Nano-sized Ag particles were precipitated during heat treatment, and the interfacial energy between Ag precipitates and matrix was determined by Becker’s model calculation.
Key words： 304 Stainless steel; Ag addition; Precipitation; Antibacterial property
Yang Xuan , Chi Zhang , Nianqing Fan , Zhigang Yang . Antibacterial Property and Precipitation Behavior of Ag-Added 304 Austenitic Stainless Steel[J]. Acta Metallurgica Sinica (English Letters), 2014 , 27(3) : 539 -545 . DOI: 10.1007/s40195-014-0085-8
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