铝对马氏体抗磨耐热钢高温抗氧化性能的影响

摘要

通过650℃和800℃下的氧化增重测量、氧化动力学分析、氧化膜XRD分析和氧化膜表面EDS分析,研究了铝对马氏体抗磨耐热钢高温抗氧化性能的影响规律.结果表明:随着含铝量的增加,抗磨耐热钢的氧化增重不断减小.含铝量为1.97％时,试样在650℃下的平均氧化速率为0.0095 g·m-2·h-1,在800℃下的平均氧化速率为0.0285 g·m-2·h-1,氧化产物由A12O3、Cr2O3、Fe(Cr Al)2O3和Fe(Cr Al)2O4组成.铝含量大于1.47％时,Al2O3氧化膜连续且致密,试样在650℃和800℃下均为完全抗氧化钢.%After analysis of oxidation kinetics, XRD and EDS, effect of aluminum on high temperature oxidation resistance of martensitic wear-resistant and heat-resistant steel was investigated.The results show that the oxidation weight gain gradually reduced with the increase of Al content.Samples containing 1.97% performed 0.009 5 g·m-2·h-1 at 650 ℃ and 0.028 5 g·m-2·h-1 at 800℃ in average oxidation rates, respectively.Oxidation products consisted of Al2O3, Cr2O3 and Fe (CrAl)2O3.Continuous and compacted oxide film formed when Al content was no less than 1.47% and consequently complete oxidation resistant was achieved at 650 ℃ and 800 ℃.