采用Gleeble 1500热模拟机对定向凝固Fe-6.5%（质量分数）Si合金进行热压缩变形研究。结果表明,Fe-6.5%（质量分数）Si合金柱状晶组织热形变过程中很难发生动态再结晶,以动态回复为主,易产生严重的变形带;在无序相区间,在柱状晶晶界处发生动态再结晶形核,但长大受到限制,仅局限于晶界附近。与锻态等轴晶组织相比,有序相区间,两种组织形变行为基本一致,受温度影响剧烈,在无序相区间,随温度升高,等轴晶组织的形变激活能略有升高,平均值约为294kJ/mol,而柱状晶组织的形变激活能逐渐降低,平均值约为260kJ/mol。
The hot-deformation behaviours of directionally solidified Fe-6.5wt%Si alloy were invested by Gleeble 1500 thermal simulation.During hot deformation the dynamic recrystallization was very hard to take place,so the soft mechanism of the DS Fe-6.5wt%Si alloy was mainly dynamic recovery and many deformation bands formed in the columnar grains.The nucleation of dynamic recrystallization was observed at the columnar grain boundaries.The deformation behavior of columnar-grained specimens was almost the same with equiaxed-grained specimens in ordered phase zone.In the disordered phase zone,deformation activation energy for the columnar structure of DS Fe-6.5wt% alloy reduced from 294 to 260kJ/mol.
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