Abstract: The distribution of V-segregation at longitudinal and cross section of ø380 mm continuous casting bloom of bearing steel GCrl5 and the structure morphology of V-segregation band have been studied. Results show that the V-segregation forms in central equiaxial crystal zone by symmetrical about center line of casting bloom and the segregation bands are parallel each another at longitudinal section; and the morphology of V-segregation bands at cross section is related with cutting location which presents with concentric distribution; there is lots of liquation carbonide in V-segregation band that is an important factor to form serious segregation.

摘要： 研究了GCr15轴承钢ø380 mm连铸坯纵、横截面V-偏析的分布,以及V-偏析带的组织形貌。结果表明,V-偏析产生于铸坯中心等轴晶区,以铸坯中心线对称分布,各纵截面偏析带之间相互平行;横截面V-偏析形貌与切割位置相关,呈同心圆分布;V-偏析带存在大量液析碳化物,是引起严重偏析的重要原因。

关键词: GCr15轴承钢, 连铸圆坯, V-偏析, 形貌和分布, 液析碳化物