铝对铁素体耐热不锈钢高温氧化行为的影响

 为了探究不同铝含量对X10CrAlSi18铁素体耐热不锈钢高温氧化行为的影响,采用恒温氧化方法对0.63%Al 和1.06%Al(质量分数)两组钢在700 ℃空气下进行高温氧化研究,测定和计算了氧化增重和平均氧化速率,观察分析了氧化形貌与氧化物相组成。结果表明,两组钢均达到了完全抗氧化级别,但1.06%Al钢的氧化增重和氧化速率均小于0.63%Al钢,表现出较好的抗高温氧化性;两组钢氧化膜均由3层组成,内层为Al₂O₃和SiO₂,中间层为Cr₂O₃和Fe₂O₃,外层则为MnCr₂O₄和FeMn₂O₄;随着铝含量的增加,氧化膜较为连续、致密,且与基体之间附着性较好,同时内氧化明显减少。

Effects of Al on high-temperature oxidation behavior of a ferritic heat-resistant stainless steel

In order to explore the effects of Al content on the high-temperature oxidation behavior of X10CrAlSi18 ferritic heat-resistant stainless steel,the isothermal oxidation method was used to conduct high-temperature oxidation study on two steels of 0.63% Al and 1.06%Al at 700 ℃ in air. The oxidation mass gain and average oxidation rate were measured and calculated,and the oxidation morphology and oxide phase composition were observed and analyzed. The results show that both of the two steels have reached the complete oxidation resistance level,but the average oxidation mass gain and average oxidation rate of 1.06%Al steel are less than 0.63%Al steel,which showing a good high-temperature oxidation resistance;The oxide films of the two steels are composed of three layers,the inner layer is Al₂O₃ and SiO₂,the middle layer is Cr₂O₃ and Fe₂O₃,and the outer layer is MnCr₂O₄and FeMn₂O₄;With the increase of Al content,the oxide film is more continuous,dense,and has better adhesion to the substrate,while the internal oxidation is significantly reduced.