Effect of Submicron-CeO2 Particles on the Microstructure and Performance of Low Carbon Steel
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摘要: 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120μm降到30μm;珠光体含量逐渐增加,珠光体片间距也由0.57μm降低到0.11μm;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%。Abstract: Microstructure refinement is an important means to improve the performance of the steel and oxides metallurgy is an important method of refining microstructures. In this paper SEM observation and hardness measurement had been made on the as-cast and as-rolled steel with submicron-CeO2 particle addition during steelmaking. SEM observation results show that the addition of CeO2 submicron powders can refine microstructure of low carbon steel. Addition of CeO2 leads to average grain size of cast decreasing from 120 μm to 30 μm,while the pearlite quantity increase and pearlite interlamellar spacing reduce from 0.57 μm to 0.11 μm. Increasing the quantity of CeO2 powder,the hardness of Q235 steel increases. When the CeO2 content is 0.7%,the resulting hardness increases by 133.4%.
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Key words:
- low carbon steel /
- microstructure /
- submicron-CeO2 particles /
- hardness
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