重熔过共晶Fe-C-B合金初生Fe_2B的凝固遗传及消除  

Heredity of primary Fe_2B in remelted hypereutectic Fe-C-B alloys and its uniform treatment

作　　者：刘谨[1] 黎振华[1] 岑启宏[1] 刘美红[2] 

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093 [2]昆明理工大学机电工程学院,昆明650093

出　　处：《北京科技大学学报》2014年第5期650-655,共6页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目(50701020;50705040;51171073);云南省中青年学术技术带头人后备人才培养资助项目(2008PY011;2009CI022);教育部留学回国人员科研启动基金资助项目

摘　　要：通过重熔和施加脉冲电流,研究了过共晶Fe-C-B合金凝固组织中初生Fe2B的遗传性和消除方法.当不施加电脉冲时,重熔难以有效消除过共晶Fe-C-B合金初生Fe2B的凝固遗传性.重熔温度较低时施加电脉冲影响凝固组织中初生Fe2B的空间分布但不改变其长杆状形态.提高重熔温度并施加电脉冲能消除凝固组织遗传的影响,使Fe2B由长杆状转变为颗粒状,并明显减少Fe2B的析出.ABSTRACT The heredity of primary Fe2 B in the solidification structure of hypereutectic Fe-C-B alloys and a uniform treatment method were investigated by remelting and electric pulse treatment. The results show that it is difficult to eliminate the heredity of primary Fe2 B only by remelting. When exerting electric pulse at a lower remelting temperature, it changes the distribution of primary Fe2 B in the solidification structure but does not change the long rod shape. But when exerting electric pulse at a higher remelting temperature, it can eliminate the effect of solidification structure heredity, the shape of Fe2 B changes from the long rod shape to particle shape, and the precipitation of Fe2 B decreases obviously.

关 键 词：过共晶合金 铁合金 凝固 重熔 电脉冲 硼化物 

分 类 号：TG244.3[金属学及工艺—铸造]