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采用电磁感应定向生长炉制备了低镍奥氏体不锈钢定向凝固试样。应用其研究了抽拉速率和稀土对初始生长区的影响。结果表明,随着拉速的增加,凝固组织由室温铸态下单一的奥氏体组织变为晶间铁素体和奥氏体组织的混合组织,凝固模式转变为A凝固模式→AF凝固模式→FA凝固模式。当拉速不变时,稀土元素含量的增加能够使低镍奥氏体不锈钢的初始过渡区凝固组织由胞状转变为树枝状,组织更加细小均匀。
Directional solidification samples of low nickel austenitic stainless steel were prepared by electromagnetic induction directional growth furnace. The effects of extraction rate and rare earth on initial growth zone were studied. The results show that with the increase of casting speed, the solidified structure changes from a single austenite structure at room temperature to a mixed structure of intergranular ferrite and austenite, and the solidification mode transforms to A solidification mode → AF solidification mode → FA solidification mode. When the casting speed is constant, the increase of REE content can change the solidified structure from cellular to dendritic in the initial transition zone of low-nickel austenitic stainless steel, and the microstructure is more even and uniform.