ABSTRACT

This study focused on multistage characterization techniques in developing an understanding of the abnormal casting behaviour of low carbon high manganese (LCHMn) steel. In addition to raw mould powder used for casting LCHMn steel, mould top slag samples were also collected for normal and abnormal casting conditions. Raw mould powder and top slag samples were characterized using XRF, XRD, and SEM-EDS to determine chemical composition, crystallinity and morphology. The chemical composition results revealed deviation of normal and abnormal behaviours from the mould powder due to the pickup of oxides of Al, Mn, and Ti. The SEM analyses of raw mould powder showed different granular particle sizes while pores and glassy/crystalline structure were seen for normal and abnormal behaviour at casting. CaF2, CaSiO3, and Na2CaSi3O9 were revealed as the mineralogical phases. There was a modified crystalline phase present in the abnormal behaviours at casting due to pickup of other oxides.

摘要

本研究侧重于多阶段表征技术，以了解低碳高锰 (LCHMn) 钢的异常铸造行为。除了用于铸造 LCHMn 钢的原始结晶器粉末外，还收集了用于正常和异常铸造条件的结晶器顶渣样品。使用 XRF、XRD 和 SEM-EDS 对生脱模粉和顶渣样品进行表征，以确定化学成分、结晶度和形态。化学成分结果表明，由于吸收了 Al、Mn 和 Ti 的氧化物，保护渣的正常和异常行为会出现偏差。原始结晶器粉末的 SEM 分析显示出不同的颗粒尺寸，而在铸造过程中可以看到孔隙和玻璃状/晶体结构的正常和异常行为。CaF2、CaSiO3、和 Na2CaSi3O9 被揭示为矿物相。由于其他氧化物的吸收，铸造时的异常行为中存在改性结晶相。