组织细化是提高钢材性能的重要手段,氧化物冶金是细化组织的一种重要方法,研究了在超声波下,向低碳钢Q235中添加亚微米CeO2粉体,用SEM观测了钢材的铸态和轧态组织,并测试了其硬度.结果显示外加CeO2亚微米粉体可以细化低碳钢铸态组织,使晶粒平均尺寸由120 μm降到30 μm;珠光体含量逐渐增加,珠光体片间距也由0.57 μm降低到0.11 μm;随着CeO2粉体加入量增加,Q235硬度增加,当CeO2的加入量为0.7％时,显微硬度提高133.4％.
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