稀土元素铈对钢的凝固和枝晶偏析的影响

本文用热分析法,金相法和电子探针微区分析考祭了铈对35GrNi₃MoV和20GrMoV二种低合金钢的凝固和枝晶偏析的影响。实验结果表明:稀土元素铈加入钢中,减轻了钢液—固转变的过冷,推迟钢的包晶反应进行;细化初次晶粒,细化等轴晶的二次枝晶臂;并在不同程度上减轻了Cr、Mo、V、Mn、Si、Ni等元素的枝晶偏析。

Effects of Cerium on the Solidification and the Dendritic Segregation of Steel Gao Ruizhen,Chen Xiaoguang

The effects of ce on the solidification and the dendritic segregation of 35CrNi3MoV and 20CrMoV steels have.been studied by means of thermal ana, lysis, metallographic examination and electron microprobe.
The results indicate that addition of cerium into steel decreases the undercooling of liguid-solid transformation of the steel,delays the peritectic reaction, refines primary grains of steel, refines secondary dendrite arm spacings of equ-iaxed crystals and decreases the dendritic segregation of Cr, Mo, V, Mn,Si,Ni etc, in different degrees.