摘要
The distribution of inclusions at the bottom of a Ce-treated heavy steel ingot was detected and calculated.The three-dimensional morphology and spatial distribution of CeAlOs clusters were characterized using the electrolytic extraction and Micro-CT detection.A model of inclusion collision to predict the aggregation of CeAlO_(3) inclusions in the ingot was established and validated by measured results.Inclusions were mainly CeAlO_(3) and a small amount of Ce_(2)O_(2)S in the tundish after cerium treatment.The collision and aggregation of inclusions led to the formation of large clusters in the ingot during the solidification process.Large slag entrainment inclusions,large CeAO_(3) clusters and small CeAlO_(3) particles were observed from the center to the edge of the ingot bottom.Large inclusions were mainly concentrated at the center.The number density of inclusions larger than 200μm was 0.21 mm^(-3).The maximum diameter of CeA1O_(3) clusters was 1340μm.From the edge to the radial center and from the bottom to the top,the average diameter of inclusions gradually increased due to the longer solidification time of the ingot.
基金
The authors are grateful for the support from National Key R&D Program(No.2023YFB3709900)
the National Natural Science Foundation of China(Grant Nos.U22A20171 and 52104343)
the Natural Science Foundation of Hebei Province(Grant No.E2021203222)
the High Steel Center(HSC)at Yanshan University and North China University of Technology,China.
