Abstract
To investigate the softening behaviour during warm deformation process, thermal compression experiment of Fe-6.5%Si silicon steel was conducted. To study the relationship between stress and strain at different strain rate, the investigation of the microstructure, hardness as well as ordered phase constituent of the rolled parts was carried out, respectively. At strain less than or equal to 0.3, micro-hardness was observed to increase with increasing strain. For strain greater than 0.3, the micro-hardness decreased with increasing strain. Indentation morphology of Vickers hardness reveals that the sink-in deformation occurs as the steel has a higher strain-hardening exponent, while pile-up deformation takes place at a lower strain-hardening exponent. Brittle B 2 (FeSi) and DO 3 (Fe 3 Si) ordered phases exists in Fe-6.5%Si steel. With the increasing strain, the diffraction spot strength of B 2 and DO 3 ordered phase is decreased, resulting in the softening behaviour of the Fe-6.5%Si steel during warm deformation process.
Highlights
Indentation morphology of Vickers hardness reveals that the sinkin deformation occurs as the steel has a higher strain-hardening exponent, while pile-up deformation takes place at a lower strain-hardening exponent
Silicon steel is widely used in the manufacture of transformers, engines and other electric devices, is an important magnetic materials applied in telecommunications and military industry [1]
Silicon content has a great influence on the properties of silicon steel, increasing silicon content lead to a lower magnetostriction, a smaller iron loss and a larger permeability
Summary
Silicon steel is widely used in the manufacture of transformers, engines and other electric devices, is an important magnetic materials applied in telecommunications and military industry [1]. When silicon content reaches 6.5%, the magnetic permeability attains the maximum value, and the magnetostriction approaches zero to confer Fe-6.5%Si steel the excellent magnetic property. Fe-6.5%Si steel has excellent magnetic properties, it is very difficult to be produced by cold rolling due to its brittleness and poor ductility caused by ordered phase in the steel [4, 5]. The results will lay the foundation for revealing the warm deformation mechanism of Fe-6.5%Si steel
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