过热度、氧分压对钢液与氧化铝之间过冷度的影响  

Effect of Overheating and Oxygen Partial Pressure on Undercooling Degree of Liquid Steel in Contact with Al_2O_3 Substrate

作　　者：罗薛超 王万林[1] 

机构地区：[1]中南大学冶金与环境学院,湖南长沙410083

出　　处：《金属材料与冶金工程》2015年第3期24-26,31,共4页Metal Materials and Metallurgy Engineering

摘　　要：采用座滴法测定了不同过热度和氧分压下钢液在单晶氧化铝上的过冷度。结果发现,当氧分压为10-23atm时,过热度从10增加到30,过冷度从225 K提高到257 K;当氧分压为10-25 atm时,过热度对过冷度没有明显影响,过冷度在300 K左右。这说明当氧分压增加时,钢液中的夹杂物的增多和反应层的产生会造成过冷度的降低。The undercooling behavior of liquid steel on Al_2O_3 substrate at different overheating degrees under different oxygen partial pressures was investigated by sessile drop technique. The results show that under the oxygen partial pressure of 10^-23 atm, the degree of undercooling increased from 225 K to 257 K as the overheating degree rose from 10 K to 30 K.Under the oxygen partial pressure of 10^-25 atm, overheating had no significant effect on the undercooling degree, which was around 300 K. It illustrates that the increase of inclusions in the liquid steel and the formation of a reaction layer at the interface between steel and substrate will lead to the decrease of undercooling degree as the oxygen partial pressure increases.

关 键 词：异相形核 过冷度 过热度 钢液 氧化铝 

分 类 号：TB331[一般工业技术—材料科学与工程]