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对中铬铁素体不锈钢18Cr Nb在700-1000℃间不同温度下开展了连续氧化实验,绘制了该钢种的氧化动力学曲线,并利用XRD、SEM和EDS等方法对氧化皮结构进行了分析和表征。结果表明,18Cr Nb铁素体不锈钢在900℃以下可形成连续致密的富Cr氧化皮,使其具备优良的抗氧化性能。当温度提高至950℃以上时,氧化膜表面的组成由富Cr的氧化物向富Cr的铬锰氧化物、富Mn的锰铬氧化物、铁的氧化物和纯铁的氧化物转变;内层氧化物由富Cr氧化物向富Fe的Fe/Cr氧化层转变,这种转变使氧化皮疏松,从而导致异常氧化,表明该钢不适合在950℃以上使用。
Continuous oxidation experiments were carried out on medium-chromium ferritic stainless steel 18Cr Nb at different temperatures of 700-1000 ℃, and the oxidation kinetics curves of the steel were drawn. The structure of oxide scale was studied by XRD, SEM and EDS Analysis and characterization. The results show that 18Cr Nb ferritic stainless steel can form continuous dense Cr rich scale below 900 ℃, which makes it possesses excellent oxidation resistance. When the temperature is raised above 950 ° C, the surface of the oxide film is changed in its composition from Cr-rich oxide to Cr-rich chromium-manganese oxide, Mn-rich manganese-chromium oxide, iron oxide and pure iron oxide; Layer oxides are converted from Cr-rich oxides to Fe-rich Fe / Cr oxides, which causes the scale to become loose, resulting in anomalous oxidation, indicating that the steel is not suitable for use above 950 ° C.