预氧化结果表明在高温氧化后对合金上附着的鳞片稀土元素起重要的作用。钇变种的附着较好的鳞片可以优质的循环焦化和防渗碳。这是因为能防止快速离子扩散的整体氧化铬层能延缓经预氧化的合金外部催化的焦化和内渗碳。对铸态合金已检测到严重的焦化和渗碳,也观察了预氧化试样,它的鳞片会严重剥落。 The results of the pre-oxidation show that it plays an important role on the scale-bearing rare earth elements attached to the alloy after the oxidation at high temperature. Yttrium variants of the better adhesion of the scales can be high-quality cycle of coking and anti-carburizing. This is because the monolithic chromium oxide layer that prevents rapid ion diffusion delays the externally catalyzed coking and internal carburization of the pre-oxidized alloy. Severe coking and carburizing have been detected on as-cast alloys, and pre-oxidized samples have also been observed, and their scale scales severely.