HT9钢在核反应堆包壳管中具有巨大的应用前景.在失水事故下,包壳管材料的温度将远高于600℃.为此,研究了HT9钢600℃以上的空气氧化行为.用增重法测定其氧化动力学曲线,利用SEM、EDS和XRD分析氧化产物的形貌、成分和结构.基于对氧化动力学与氧化产物的分析,探讨其氧化机制.结果表明:在600~1000℃范围内随着温度的升高和时间的延长,HT9钢氧化程度增加;氧化层呈双层结构,内层为(Fe,Cr)2 O3,外层是Fe2 O3;不同温度的氧化动力学遵循不同的规律,氧化过程主要受铁离子和铬离子的扩散共同控制.
There is great potential application for HT9 steel as cladding tube for nuclear reactor.The working tem-perature will be higher than 600℃ when loss of coolant accident (LOCA)happens.Therefore,oxidation behavior of HT9 steel over 600℃ in air was investigated.The oxidation kinetics curves of HT9 steel were characterized by the variation in weight gain per area.The morphology,composition and microstructures of the oxidation products were studied by SEM,EDS and XRD.The oxidation mechanisms were discussed on the basis of the oxidation ki-netics and the oxidation products.The results show that the thickness of the oxide layer increases with increasing temperature and time.The oxide products can be divided into two layers:the inner (Fe,Cr)2 O3 layer and the outer Fe2 O3 layer.The oxidation kinetics of HT9 steel changes with test temperatures and is controlled mainly by the transmissions of Fe and Cr ions through the oxide scale.
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