开发了一种改进型的铁素体耐热钢,采用高精度差分膨胀仪对该钢种的奥氏体化行为进行了研究。研究表明加热速率对其微观组织和相变行为有着显著影响。随着加热速率的提高,原奥氏体晶粒尺寸下降,奥氏体转变所需的时间变短,奥氏体相变温度升高,并且还会导致沉淀无法充分溶解至基体中。
A modified high-Cr ferritic heat resistant steel had been developed.Austenitizing behavior of this new-type heat resistant steel was investigated by DIL 805A/D high-resolution differential dilatometer.The results show that heating rate has a significant effect on the microstructure and phase transformation behavior of the steel.The increase of heating rate results in the decrease of prior austenite grain size and austenite transformation time,the increase of austenite transformation temperature,and incomplete dissolution of precipitates.
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