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对稀土处理C-Mn钢的夹杂物和显微组织进行分析,统计稀土处理C-Mn钢中针状铁素体形核核心尺寸,并将稀土处理钢在不同温度下淬火,研究稀土夹杂物生成和长大过程.实验结果表明:C-Mn钢加入少量稀土后钢中夹杂物从MnS+硅铝酸盐夹杂转变为La_2O_2S+LaAlO_3+MnS+硅铝酸盐夹杂,尺寸得到细化,显微组织也从马氏体+贝氏体组织变成侧板条铁素体、针状铁素体和块状铁素体组织;稀土处理C-Mn钢中针状铁素体有效形核核心的尺寸集中在1~4μm,主要是在钢液中形成,冷却和凝固过程形成的数量较少;稀土夹杂物在钢液温度和冷却及凝固过程容易碰撞黏合长大,上浮从钢液中去除,MnS能在稀土夹杂物颗粒间析出.
The inclusions and microstructure of rare earth C-Mn steels were analyzed. The size of acicular ferrite core nucleation in C-Mn steels was calculated, and the rare earth steels were quenched at different temperatures to study the formation of rare earth inclusions And the growth process.The experimental results show that the inclusions in the steel changed from MnS + alumino-silicate to La 2 O 3 + LaAlO 3 + MnS + alumino-aluminate inclusions after adding a small amount of rare earth into C-Mn steels and their sizes were refined and the microstructure From martensite + bainite into side lath ferrite, acicular ferrite and massive ferrite; RE-treated C-Mn steel acicular ferrite effective nucleation of the core size of the concentration In 1 ~ 4μm, it is mainly formed in the molten steel, and the cooling and solidification process is less. The rare earth inclusions tend to collide and grow in the molten steel during the cooling and solidification process, and float upward and remove from the molten steel. The MnS energy Rare earth inclusion particles precipitated.