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采用沉铅法,对不同拉速和碳含量条件下的铸坯液相穴末端位置、截面形状进行了测定。结果表明:铸坯液相穴长度随拉速提高和碳含量增加而延长,液相穴纵截面和横截面形状大体上呈“V”字形和圆形。X射线强度检测进一步验证了液相穴液芯外侧固、液两相区的客观存在和铸坯在冷却凝固过程中的非均匀性。测定结果可作为优化二冷制度和动态轻压下工艺参数的重要技术依据。
Sediment lead method was used to determine the position and cross section of the liquid phase cavity at different casting speeds and carbon contents. The results show that the length of the liquid phase of the slab prolongs with the increase of the casting speed and the increase of the carbon content. The longitudinal section and the cross section of the liquid phase are roughly “V” -shaped and circular in shape. The X-ray intensity detection further verifies the objective existence of the solid-liquid two-phase region and the non-uniformity of the slab during cooling and solidification on the outside of the liquid phase liquid core. The determination results can be used as an important technical basis for optimizing the second cooling system and dynamic soft reduction process parameters.