稀土元素鈰對鋼的凝固和枝晶偏析的影響

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

摘要: 本文用熱分析法,金相法和電子探針微區分析考祭了鈰對35GrNi₃MoV和20GrMoV二種低合金鋼的凝固和枝晶偏析的影響。實驗結果表明:稀土元素鈰加入鋼中,減輕了鋼液—固轉變的過冷,推遲鋼的包晶反應進行;細化初次晶粒,細化等軸晶的二次枝晶臂;并在不同程度上減輕了Cr、Mo、V、Mn、Si、Ni等元素的枝晶偏析。

Abstract: 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.