Fe-Cr26-Ni13系中碳耐热铸钢高温抗氧化性能分析

Analysis on High Temperature Oxidation Resistance of Medium Carbon Fe-Cr26-Ni13 Heat Resistanting Casting Steel

基于研制使用温度在1200℃耐热铸钢的目的,通过化学成分设计,使用中频感应炉冶炼,研制了一种铁铬镍稀土耐热铸钢,并在其基础上分别加入了含量为2wt%、4wt%、6wt%的铝,铸造了三种铁铬镍铝稀土耐热铸钢,并在1200℃进行了高温抗氧化性试验。通过氧化增重测量、氧化动力学分析,并使用X射线衍射仪对氧化膜结构进行了分析。结果表明:适量的铝能明显提高耐热铸钢的高温抗氧化性,铝含量在4wt%左右时,高温抗氧化性能最佳,最佳的保护性氧化膜是Al2O3和(Al,Cr)2O3的复合膜。

Based on the purpose of developing a beat-resistant casting steel which its service temperature is around 1200 ℃, by chemical composition design, a RE Medium Carbon Fe-Cr-Ni heat resisting casting steel and on this basis, three kinds of heat-resistant casting steel, such as 2%Al, 4%Al, 6%Al, was added separately, which were melted and cast in medium fequency induction furnace. High temperature oxidation resistance was tested at 1200℃. By oxidation weight, the analysis of oxidation kinetics, and the analysis of oxide film structure was studied by X-ray diffraction. The results show that a certain amount of Al can improve high temperature oxidation resistance of ZG40Cr26Ni13 obviously. When aluminum content is 4wt%, the performance of high temperature oxidation resistance is best. The best composite film consists of Al2O3 and （Al, Cr）203.