论文部分内容阅读
利用Aspex Explorer自动扫描电镜对探伤不合格试样中非金属夹杂物CA2和CA6(C为Ca O,A为Al2O3)的尺寸、面积、成分、类型及分布等进行全面分析。从非金属夹杂物本身性质、连铸机本身特性和凝固过程非金属夹杂物行为3个方面集中探讨了高熔点钙铝酸盐类非金属夹杂物聚集行为。结果表明:高熔点钙铝酸盐类非金属夹杂物本身聚集能力很强,极易聚集;弧形连铸机拉速慢,铸坯厚度较一般的中厚板薄,凝固较快,使得凝固终点提前,造成在凝固过程中夹杂物在靠近中心处形成容易聚集区,同时上浮的空间和时间减少,加上推动捕捉的作用,使得中心处聚集形成大型非金属夹杂物。
The size, area, composition, type and distribution of non-metallic inclusions CA2 and CA6 (C is CaO, A is Al2O3) were analyzed by Aspex Explorer automatic scanning electron microscope. From three aspects of the nature of non-metallic inclusions, the properties of continuous casting machines and the non-metallic inclusions in the solidification process, the aggregation behavior of high-melting-point calcium aluminate non-metallic inclusions was discussed. The results show that the high-melting-point calcium aluminate non-metallic inclusions have a strong ability of aggregation and are easy to accumulate. The arc-type continuous casting machine is slow in pulling speed, and the thickness of slab is thinner than that of ordinary plate, In the process of solidification, the inclusions formed easy-to-assemble area near the center, while the space and time of floating up decreased. With the help of the catching effect, large-scale non-metallic inclusions were formed in the center.