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采用自行设计的结晶器可旋转电渣炉,研究了旋转速率对电渣重熔钢锭中元素偏析度的影响.结果表明,当结晶器旋转速率为0～28 r/min时,随其增加,元素的分布更均匀,C偏析度从0.26降至0.0545,Si偏析度从0.26降至0.06,Mn偏析度从0.17降至0.03,Cr偏析度从0.275降至0.066,原因是结晶器运动带动渣池运动,使渣池温度趋于均匀化,同时渣池运动也带动金属液滴在渣池中运动,使小液滴随机滴落于金属熔池中,而不是集中于金属熔池中心部位,因而促进熔池温度均匀分布,有利于形成浅平状熔池;但旋转速率过高对电渣重熔钢锭的凝固质量有害,当旋转速率从28 r/min增至35 r/min时,C偏析度从0.0545增至0.097,Si偏析度从0.06增至0.08,Mn偏析度从0.03增至0.076,Cr偏析度从0.066增至0.16,原因是渣池剧烈运动带动金属熔池运动,流动的液态金属冲洗两相区,将其中树枝晶周围的浓化溶质带走,使该区域溶质含量降低,导致元素偏析.
The influence of rotation rate on element segregation degree in electroslag remelting ingot was investigated by using a self-designed mold rotating electroslag furnace.The results show that when the mold rotation rate is 0 ~ 28 r / min, Elemental distribution more evenly, C segregation decreased from 0.26 to 0.0545, Si segregation decreased from 0.26 to 0.06, Mn segregation decreased from 0.17 to 0.03, Cr segregation decreased from 0.275 to 0.066, because the mold movement led to the slag pool Movement, so that the slag pool temperature tends to be uniform, while the slag pool movement also drives the movement of metal droplets in the slag pool, so that small droplets drip randomly in the metal pool, rather than concentrate on the center of the metal pool, and thus The uniform temperature distribution of the molten pool is favorable for the formation of shallow flat pool. However, the high rotation rate is harmful to the solidification quality of the ESR ingot. When the rotation rate is increased from 28 r / min to 35 r / min, the C segregation Degrees from 0.0545 to 0.097, Si segregation increased from 0.06 to 0.08, Mn segregation increased from 0.03 to 0.076, and Cr segregation increased from 0.066 to 0.16 due to the strenuous movement of the slag pool, which caused the movement of the molten metal Rinse the two-phase zone, in which dendrites around the concentrated solute away, so that the area of solute It was reduced, leading to segregation.