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采用SEM,XRD以及TEM对经抗菌时效处理后的含Cu双相不锈钢中抗菌富Cu相的微观结构及析出演变规律进行了研究.结果表明,在540 - 580℃温度范围内.双相不锈钢中的铁素体基体及α/γ相界上均有抗菌富Cu相析出,奥氏体内没有新相的析出;随时效时间的延长,析出相逐渐粗化,并由球形颗粒状转变为棒状或长条状;随着时效温度的提高,富Cu相析出速率加快,较快地由颗粒状转变为棒状;时效处理过程中,富Cu相会随时间的延长及温度的提高从亚稳态过渡到稳定的ε-Cu相;ε-Cu相具有复杂的多层孪晶结构,与铁素体基体满足Kurdjumov- Sachs取向关系:(111)_(ε-Cu)∥(110)_(α-Fe),[011]_(ε-Cu)∥[001]_(α-Fe),(111)_(ε-Cu)∥(121)_(α-Fe),[011]_(ε-Cu)∥[012]_(α-Fe).
The microstructure and precipitation evolution of antimicrobial Cu-rich phase in Cu-containing duplex stainless steel after antibacterial aging were studied by SEM, XRD and TEM. The results show that in the temperature range of 540-580 ℃, Of the ferrite matrix and the α / γ phase boundary are antimicrobial Cu-rich phase precipitation, austenite no new phase precipitation; with the aging time, the precipitated phase gradually coarsening, and from spherical granular into rod-like Or long strip. With the increase of aging temperature, the precipitation rate of Cu-rich phase increases faster and changes from granular to rod shape rapidly. During the aging treatment, the Cu-rich phase increases with time and temperature from metastable state (111) _ (ε-Cu) ∥ (110) _ (α) and the ferrite matrix satisfy the Kurdjumov-Sachs orientation relationship: ε-Cu phase has a complex multi-layer twin structure. -Fe, [011] _ (ε-Cu) ∥ [001] _ (α-Fe), (111) _ (ε-Cu) // (121) _ -Cu) // [012] _ (α-Fe).