300M钢的高温氧化行为

High temperature oxidation behavior of 300M steel

研究了300M钢在700~1200℃高温下的氧化行为,利用扫描电镜(SEM)和X射线衍射仪等手段观察分析了氧化层的表面形貌、微观组织结构成分,并结合氧化动力学曲线,分析了300M钢在700~1200℃高温氧化的氧化机理。研究结果表明,300M钢在700~1200℃的氧化遵循抛物线规律。高温条件下其氧化皮为典型的3层结构,即内氧化层、中间氧化层及外氧化层,中间氧化层又分为多孔层和疏松层。当氧化温度为1200℃时,Fe O层晶粒内部的合金化元素Si、Cr等快速聚集并形成粗大的氧化物,此时Fe O层完全失去抗氧化作用,氧化速率急剧加快。

Oxidation behavior of the 300 M steel at high temperature between 700-1200℃was investigated.Surface morphologies of oxide layer and the oxide structure were investigated by means of SEM and XRD.Combined with the analysis of oxidation kinetics curves,the oxidation mechanism of the 300 M steel between 700-1200℃was analyzed.The results show that the 300 M steel presents parabolic law in the temperature range of 700-1200℃.At high temperature,the oxide scale of the 300 M steel has a typical three-layer structure,which is the outer layer,the middle layer,and the inner layer,and the inner layer is divided into porous layer and loose layer.When the oxidation temperature is 1200℃,the alloying elements Si and Cr in the Fe O layer grains rapidly aggregate and form coarse oxides,at this time,the Fe O layer completely loses its antioxidant effect,and the oxidation rate accelerates sharply.