深过冷BFe30-2合金凝固组织演化
Solidification Microstructure Evolution of Highly Undercooled BFe30-2 Alloy
马泉山1， 郝维新2， 耿桂宏1， 於杨栋2
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作者单位：1. 北方民族大学 材料学院，宁夏 银川 750021； 2. 太原科技大学 材料学院，山西 太原 030024
中文关键字：过冷； BFe30-2合金； 凝固组织； 演化
英文关键字：undercooling; BFe30-2 alloy; solidification microstructure; evolution
中文摘要：用熔融玻璃净化与循环过热相结合的方法，研究了BFe30-2合金过冷熔体凝固组织的演化规律。研究表明：在过冷度39～203 K的范围内，其凝固组织的形态有三次变化过程：第一次是在39～118 K过冷度范围，随着过冷度的增加，凝固组织中枝晶明显细化且同时存在枝晶重熔形成的第一类粒状晶；第二次发生在118～174 K过冷度范围，因枝晶熟化被抑制，形成的第一类粒状晶转变为高度细化的细枝晶；第三次发生在174～203 K过冷度区间，组织因细枝晶再结晶转变为均匀的准球状晶粒。
英文摘要：The microstructure evolution of undercooled melt of BFe30-2 alloy was investigated by means of melted glass purification and cyclical superheating. The results indicate that, within the undercooling range (39～203 K ), the microstructure undergoes three transformation processes. Within the first procedure of undercooling range (39～118 K), the coarser dendrites become fine clearly and the first granular is formed by dendrites remelting with the increase of undercoling. Within the second procedure of undercooling range (118～174 K), the first granular changes into highly finer dendrites due to the restrained ripening course. Within the third procedure of undercooling range (174～203 K), a kind of even quasi-spherical grain is formed by the recrystallization of highly finer dendrites.