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Effect of heat treatment on mechanical properties of heavily cold-rolled Fe-6.5wt%Si alloy sheet

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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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Correspondence to JunPin Lin.

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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

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