高铬铸铁的氧化行为

OXIDATION BEHAVIOUR OF HIGH Cr CAST IRON

从基体含Cr量及碳化物数量两方面考察了高Cr铸铁在950℃和800℃的氧化行为,分析了氧化后的氧化物类型、形貌及亚表层微区成分结果表明基体原始含Cr量决定了形成氧化物的类型,是决定高Cr铸铁抗氧化性的重要因素;950℃氧化时由于碳化物分解使合金抗氧化性随碳化物量增加而提高,而800℃氧化时由于碳化物未分解。

Oxidation behaviours of high Cr cast iron at 950 and 800℃ have been investi-gated on the basis of. Cr content and carbide volume. Type and morphology of oxide film andmicrostructure of subsurface after oxidation have also been examined. The original Cr con-tent, to be related to the type of oxide film, is an important factor of resistance to oxidation ofthe high Cr cast iron. Resistance to oxidation of the cast iron may be improved with the in-crease of carbide volume owing to the decomposition of the carbide during oxidation at950℃. While it does not be improved because the carbide is not yet decomposed at 800℃.