Abstract
Fe-6.5wt%Si alloy has excellent soft magnetic properties, but it is hard to be cold-rolled due to appearance of ordered phases in this alloy. In this paper we report that ultra thin Fe-6.5wt%Si sheet of 0.05 mm thick was obtained by heavily cold rolling. By means of optical microscope, micro-hardness indenter, instron, SEM and X-ray diffraction, the effect of heat treatment on mechanical properties of this alloy sheet was investigated. The heavily cold-rolled sheet exhibits some extent of ductility. The ultimate tensile strength reaches 1.93 GPa. After heat treatment, micro-hardness is decreased and the ductility is lost, especially at temperature above 650°C when recrystallization takes place. The reason for decreasing the ductility lies in the ordered DO3 phase transformation.
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Bozorth R M. Ferromagnetism. New York, 1951
Raviprasad K, Chattopadhyay K. The influence and critical points and structure and microstructural evolution in iron rich Fe-Si alloys. Acta Metall Mater, 1993, 41: 609–624
Shin J S, Bae J S, Kim H J, et al. Ordering-disordering phenomena and micro-hardness characteristics of B2 phase in Fe-(5%-6.5%)Si alloys. Mater Sci Eng A, 2005, 407: 282–290
Ros-Yanez T, Ruiz D, Houbaert Y, et al. Study of ordering phenomena in high silicon electrical steel (up to 12.5at%) by Mossbauer spectroscopy. J Magn Magn Mater, 2002, 242: 208–211
Shin J S, Lee Z H, Lee T D, et al. The effect of casting method and heat treating condition on cold workability of high-Si electrical steel. Scripta Mater, 2001, 45: 725–731
Takada Y, Abe M, Masuda S, et al. Commercial scale production of Fe-6.5wt% Si sheet and its magnetic properties. J Appl Phys, 1988, 64: 5367–5369
Silva M C A, Bolfarini C, Kiminami C S. Microstructure and magnetic properties of Fe-6.5wt%Si alloy obtained by spray forming process. Mater Sci Forum, 2005, 498-499: 111–118
Li R, Shen Q, Zhang L M, et al. Magnetic properties of high silicon iron sheet fabricated by direct powder rolling. J Magn Magn Mater, 2004, 281: 135–139
Ros-Yanez T, Houbaert Y, Rodriguez V G. High-silicon steel produced by hot dipping and diffusion annealing. J Appl Phys, 2002, 91: 7857–7859
Ros-Yanez T, Houbaert Y, Fischer O, et al. Production of high silicon steel for electrical applications by thermomechanical processing. J Mater Process Tech, 2003, 143: 916–921
Bi X F, Tanaka Y, Sato K, et al. The relationship of microstructure and magnetic properties in cold-rolled 6.5% Si-Fe alloy. IEEE Trans Magn, 1996, 32: 4818–4820
Kim K N, Pan L M, Lin J P, et al. The effect of boron content on the processing for Fe-6.5wt% Si electrical steel sheets. J Magn Magn Mater, 2004, 277: 331–336
Calvillo P R, Ros-Yanez T, Ruiz D, et al. Plane strain compression of high silicon steel. Mater Sci Tech, 2006, 22: 1105–1111
Jang J S C, Koch C C. Amorphization and disordering of the Ni3Al ordered intermetallic by mechanical milling. J Mater Res, 1990, 5: 498–510
Zuo B, Sritharan T. Ordering and grain growth in nanocrystalline Fe75Si25 alloy. Acta Mater, 2005, 53: 1233–1239
Dadras M M, Morris D G. Mechanical disordering of Fe-28%Al-4%Cr alloy. Scripta Metall Mater, 1993, 28: 1245–1250
Liang Y F, Lin J P, Ye F, et al. Effect of ordering on cold workability of Fe-6.5wt%Si alloy. EPD Congress, 2009: 669–674
Wittig J E, Frommeyer G. Deformation and fracture behavior of rapidly solidified and annealed iron-silicon alloys. Metall Mater Trans A, 2008, 39A: 252–262
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Liang, Y., Ye, F., Lin, J. et al. Effect of heat treatment on mechanical properties of heavily cold-rolled Fe-6.5wt%Si alloy sheet. Sci. China Technol. Sci. 53, 1008–1011 (2010). https://doi.org/10.1007/s11431-010-0125-1
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DOI: https://doi.org/10.1007/s11431-010-0125-1