Influence of Cooling Rate on Microstructure of Oxide Scales Formed on Low Carbon Steel Wires(Chinese)
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摘要: 采用X射线衍射与Mossbauer谱分析相结合，研究了不同冷却速率下低碳钢表面形成氧化皮的微观结构；借助磁力显微镜的抬高模式测量氧化皮的磁畴图，获得了氧化皮内Fe3O4的分布形态及冷却速率对其变化的影响.结果表明：快速冷却时氧化皮中Fe2O3的含量减少；FeO与Fe3O4的比例增大；化学计量的FeO含量和Fe3O4的缺陷程度也随冷却速率的变化而变化.氧化皮的相组成和氧化皮内Fe3O4的分布形态是影响氧化皮性能的主要因素.Abstract: Oxide scales were prepared by cooling low-carbon steel wires at different rates and the microstructure was investigated by X-ray diffraction (XRD) and Mossbauer spectroscopy. The distribution of Fe3O4 in the oxide scale was obtained using Magnetic Force Microscope (MFM), through which the influence of the cooling rate on the distribution of Fe3O4 was studied. The results showed that when lowcarbon steel wires are rapidly cooled, the content of Fe2O3 in the oxide scale decreases while the content ratio of FeO to Fe3O4 increases. At the same time, the content of stoichiometric FeO and the defect concentration of Fe3O4 can also change with different cooling rates. The phase composition of the oxide scale and the distribution of Fe3O4 are the main factors that affect the properties of the oxide scale.
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