ABSTRACT

Residual elements (Cu, Ni and Sn) of various contents have been added to a low-carbon steel to simulate the scenario of increased use of scrap during steel production. The samples were oxidized in air to represent reheating before hot rolling, using thermogravimetry analysis (TGA). Scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS) were employed to investigate the microstructure and the enrichments at the oxide/metal interface. Results showed the residual elements had an impact on the roughness of the scale/metal interface, internal Fe oxides formation, the amount of Ni&Cu enriched Fe phase and Cu&Sn enriched liquid phase at the interface, and the depth and spacing of the liquid phase penetrations along the grain boundaries. Thermodynamic simulation predicted the effect of residual elements on liquid phases formation at the interface, with good agreement between prediction and experimental results. The influence of residual elements on the oxidation rate was discussed.

摘要

低碳钢中添加了不同含量的残余元素（Cu、Ni 和 Sn），以模拟钢铁生产过程中废料使用量增加的情况。使用热重分析 (TGA)，样品在空气中被氧化以表示热轧前的再加热。采用扫描电子显微镜 (SEM) 和能量色散光谱 (EDS) 来研究氧化物/金属界面处的微观结构和富集情况。结果表明，残余元素对氧化皮/金属界面的粗糙度、内部Fe氧化物的形成、界面处Ni&Cu富集Fe相和Cu&Sn富集液相的数量，以及液相渗透的深度和间距都有影响。晶界。热力学模拟预测了残留元素对界面液相形成的影响，预测结果与实验结果吻合良好。讨论了残留元素对氧化速率的影响。