ABSTRACT

In this study, a permanent magnet stirrer was constructed for the implementation of experiments on different magnetic field stirring modes. Through experiments, it can be observed that when the fixed speed of 200 rpm and the alternate stirring mode of magnetic field was adopted, the loose area in the core of ingots was reduced from about 72 mm² to 21 mm², which significantly improved the density and element uniformity of the ingot. A Φ220 mm SAE1527 round billet was selected as industrial trial steel. When the stirring current and frequency was 350 A and 3 HZ, the electromagnetic stirring of the mold was adjusted from continuous stirring to alternate stirring mode. The solidification structure of the billet has been improved to a certain extent. Furthermore, the number of spot segregation larger than 0.5mm² was reduced from 43 to 26, thereby improving the uniformity of internal elements in the billet.

摘要

本研究构建了永磁搅拌器，用于实施不同磁场搅拌模式的实验。通过实验可以观察到，当采用固定转速200rpm和磁场交替搅拌方式时，铸锭芯部疏松面积由约72mm 2 减少至^21mm 2 ^。，显着提高了铸锭的密度和元素均匀性。工业试验钢选用Φ220 mm SAE1527圆钢坯。当搅拌电流和频率为350A、3HZ时，模具的电磁搅拌由连续搅拌调整为交替搅拌模式。坯料的凝固组织得到一定程度的改善。此外，大于0.5mm ²的点偏析数量从43个减少到26个，从而改善了钢坯内部元素的均匀性。