Effect of cerium on the as-cast microstructure and tensile ductility of the twin-roll casting Fe–6.5wt% Si alloy

Fe–6.5wt% Si alloy doped with cerium is fabricated by twin-roll casting. Ce2O2S precipitates in the melt and acts as the efficient nucleation agent, leading to a refined solidification microstructure. The tensile ductility of this as-cast strip significantly reaches up to 56.8% at 600°C, which is su...

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Bibliographic Details
Published in:Materials letters 2016-02, Vol.165, p.5-8
Main Authors: Li, Hao-Ze, Liu, Hai-Tao, Wang, Xiang-Long, Cao, Guang-Ming, Li, Cheng-Gang, Liu, Zhen-Yu, Wang, Guo-Dong
Format: Article
Language:English
Subjects:
Cerium
Deformation and fracture
Ductility
Electrical steels
Fe–6.5 wt% Si alloy
Microstructure
Precipitates
Silicon
Silicon steels
Solidification
Strip
Tensile ductility
Twin roll casting
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Summary:Fe–6.5wt% Si alloy doped with cerium is fabricated by twin-roll casting. Ce2O2S precipitates in the melt and acts as the efficient nucleation agent, leading to a refined solidification microstructure. The tensile ductility of this as-cast strip significantly reaches up to 56.8% at 600°C, which is superior to the 22.8% of the as-cast strip undoped with cerium. The much more uniform and finer solidification microstructure along with the strengthened grain boundary is inferred to result in the dramatic improvement in tensile ductility. •Fe–6.5wt% Si alloy doped with cerium was produced by twin-roll casting.•Much finer and homogeneous solidification microstructure was formed.•Tilted dendrites were formed in the outer layer of the as-cast strip.•Tensile ductility of the as-cast strip was greatly improved at 600°C.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2015.11.100