【摘要】 用Fe₂O₃:Fe:Al₂O₃=1:1:1混合粉末,对20、20Cr、20Cr2Ni4、40Cr和GCr15五种钢进行了860～1100℃×8～80h内氧化处理,对其内氧化动力学进行了研究。研究结果表明:（1）钢的内氧化动力学遵守抛物线规律;（2）内氧化速度随内氧化温度的升高、钢中合金元素（主要是铬）和碳含量的降低而增大;（3）初始晶粒越小,内氧化速度越大;（4）内氧化过程中氧的晶界扩散发挥着重要作用;（5）试样表面氧化物覆层对内氧化速度有阻碍作用。这种阻碍作用表现在内氧化初期。更多还原

【Abstract】 20、20Cr、20Cr2Ni4、40Cr、GCr15 steels were internally oxidized for 8 to 80 hours at temperatures between 860 and 1100℃ using a powder mixture of Fe₂O₃: Fe: Al₂O₃= 1:1:1. The kinetics of internal oxidation of the steels was studied. The results indicate that the kinetics of internal oxidation of the steels obeys a parabolic law. The rate of internal oxidation increases with the increase of the oxidation temperatnre and the decrease of the content of the solute elements and carbon in the steels. The smaller is the initial grain, the faster is the internal oxidation. The diffusion of oxygen along grain boundaries during the process of internal oxidation plays a significant role. Oxide film on surface hinds internal oxidation in the initial stage.更多还原