变质CH13钢中Ce_2O_3异质核心作用的研究

Study on Heterogeneous Nuclei in Cast H13 Steel Modified by Rare Earths

采用变质处理大大减弱了CH13钢枝晶组织的元素偏析 ,使未变质CH13钢中的晶界碳化物得以消除 ,CH13钢的冲击韧性大大提高。通过热力学计算及二维点阵错配度计算 ,并采用电子探针定量分析等手段 ,证实Ce2 O3型稀土夹杂物可作为CH13钢中初生奥氏体的异质核心 ,细化枝晶组织 。

The dendrite segregation in cast H13 steel is weakened with RE modification treatment. Carbide on grain boundary disappeared after quenching, and impact toughness improved greatly. By two dimensional lattice misfitting calculation and analysis by electron probe, it is found that Ce 2O 3 may act as the heterogeneous nuclei of modified cast H13 steel.