By tailoring the reverse austenite transformation behavior of 9Cr oxide dispersion strengthened (ODS) ferritic/martensitic steels, the residual ferrite in ODS steels can be controlled. The reverse austenite transformation behavior of ODS steels is closely related to the initial microstructure conditions prior to austenite transformation. For the spark plasma sintered steels, both the amount and size of residual ferrite decrease with increasing heating rate. Nevertheless, high heating rate will increase the amount and size of residual ferrite in annealed ODS steels. As an isothermal treatment is performed at temperatures above Ac₁, lower isothermal temperature has a more evident effect on the ferrite distribution in spark plasma sintered steels than that in annealed ones.

通过调整9Cr氧化物弥散强化（ODS）铁素体/马氏体钢的反向奥氏体转变行为，可以控制ODS钢中的残留铁素体。ODS钢的反向奥氏体转变行为与奥氏体转变之前的初始显微组织条件密切相关。对于火花等离子烧结钢，残余铁素体的数量和尺寸都随加热速率的增加而降低。然而，高加热速率将增加退火ODS钢中残留铁素体的数量和尺寸。当在高于Ac _1的温度下进行等温处理时，较低的等温温度对火花等离子烧结钢中的铁素体分布的影响比经退火处理的钢更明显。