摘要
采用金相、扫描电镜对409L连铸坯的夹杂物数量、分布、类型进行实验研究,热力学分析连铸坯中夹杂物形成机理。结果表明：连铸坯上表面夹杂物数量较多,连铸坯边部三角区域的堆状复合夹杂物数量较多;夹杂物类型以TiN、TiN包裹MgO·Al2O3的复合夹杂物为主;当钢中[N]质量分数0.01%、钢液温度1 580-1 600℃,生成TiN夹杂所需要平衡[Ti]质量分数为0.124%-0.154%;钢中[Al]质量分数为0.01%,若钢中[Mg]质量分数不小于7.5×10^-5%,则钢液中易生成MgO·A12O3,当[Mg]质量分数不小于0.000 7%后,MgO·A12O3转变为MgO。
The quantity, distribution and type of the inclusions in 409 L slab have been studied by using OM,SEM（Scanning Electronic Microscope） method, and the inclusion formation mechanism has been analyzed thermodynamically. The results showed that more inclusions were in the upper surface of slab, and more piles of inclusions were in edge trigonometry area of slab. The types of inclusions mainly included Ti N and Mg O·Al2O3encapsulated by Ti N.When the temperature of molten steel was in the range of 1 580 ℃ to 1 600 ℃, and [N] remains 0.01%, TiN inclusions formed with the equilibrium concentration of [Ti] remains 0.124%- 0.154%. Mg O · A12O3 could formed in molten steel as the concentration of [Al] was0.01% and [Mg] higher than 7.5 × 10^- 5%,while MgO · A12O3 inclusions would disintegrated into MgO when [Mg] was more than 0.000 7%.
出处
《连铸》
2015年第3期59-62,共4页
Continuous Casting
