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利用玻璃包熔在悬浮熔炼装置上,通过多次热循环的方法,使处于真空条件下的亚共晶 Fe-C-Si 合金熔体获得深过冷。试验结果表明:随着循环次数的增加,过冷度增大,而凝固组织中的初生相二次臂间距(DAS)减小,r-Fe_3C 共晶形态由蜂窝状向板片状转变且片间距减小。
The glass melting process was used to melt the hypo-eutectic Fe-C-Si alloy under vacuum condition through multiple thermal cycles. The experimental results show that the degree of undercooling increases with the increase of the number of cycles, while the secondary arm spacing (DAS) of the primary phase in the solidified structure decreases. The eutectic morphology of the r-Fe_3C transitions from the honeycomb shape to the plate shape and the sheet Pitch decreases.