| Summary: | 碩士 === 義守大學 === 材料科學與工程學系 === 92 === The duplex stainless steel has equal amount of austenite and ferrite and better practical properties in comparison with austenitic and ferritic stainless steels, especially in corrosion resistance. It is usually used in environment where high strength and high corrosion resistance are requested, like power plants, chemical and pharmaceutical plants etc.
This study discusses the effects of different copper content on the mechanical properties and antimicrobial activity of 2205 duplex stainless steels. The results showed the hardness of ferrite increases with the increasing of aging time at 400℃ and 800℃, the precipitation of σ phase makes the duplex stainless steel hardened. At 600℃, the maximum hardness happened at aging time 0.5 hour. The ferritic phase can be reduced by the increasing of copper content because copper enhances the formation of σ phase. In antimicrobial aspect, the duplex stainless steels containing copper have good antimicrobial effect at 600℃ aging condition. The obvious antimicrobial properties of duplex stainless steel should be in the formation of nickel and copper ions.
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