Abstract
Cylindrical Fe-6.5 wt. % Si bars of 7.5 mm diameter were successfully fabricated from an as-cast ingot through three rolling stages, with 10 total passes: rough rolling at 850–900 °C and 8–10 m/min; medium rolling at 800–850 °C and 10–15 m/min; finish rolling at 800–850 °C and 12–18 m/min. The evolution of the microstructure, texture, and ordered structure were studied, and the mechanical properties were investigated. Results indicated that the grains were refined by the hot bar rolling. Area fractions of the {100}<011> and {011}<100> oriented grains decreased to 0 during hot bar rolling, whereas the {100}<001>, {011}<211>, and {112}<110> components increased. Furthermore, the γ fiber with {111}<110> component was dominant. After the hot bar rolling, the DO3 ordered phase was suppressed, and the B2 ordered domains were refined. Ductility of the as-rolled bar was better than that of the rotary-swaged bar, due to the absence of the DO3 ordered phase, and refinement of the grains in the rolled bar. Moreover, discontinuous dynamic recrystallization (DDRX) occurred at a high deformation rate during the rough rolling, and continuous dynamic recrystallization (CDRX) appeared at a low strain rate during the finish rolling. Hence, hot bar rolling technology is an excellent process for the fabrication of Fe-6.5 wt. % Si bars.
Highlights
The Fe-6.5 wt. % Si alloy has excellent soft magnetic properties, such as high electrical resistance, high relative permeability, near-zero magnetostriction, low coercive force, and low iron loss, making this alloy promising for use in high-frequency applications such as transformers, power generators, and electric relays [1,2]
Microstructure, texture, and ordered structure evolution were investigated, and the the mechanical properties of the Fe-6.5 wt. % Si bars were studied in order to obtain the optimal mechanical properties of the Fe-6.5 wt. % Si bars were studied in order to obtain the optimal mechanical mechanical property combination that improves the drawing efficiency of Fe-6.5 wt. % Si wires
The high rolling temperature and low deformation ratio resulted in full recrystallization and grain growth for the Fe-6.5 wt. % Si alloy in the finish rolling stage, which made the γ fiber content weaken slightly [29,30]
Summary
The Fe-6.5 wt. % Si alloy has excellent soft magnetic properties, such as high electrical resistance, high relative permeability, near-zero magnetostriction, low coercive force, and low iron loss, making this alloy promising for use in high-frequency applications such as transformers, power generators, and electric relays [1,2]. % Si alloy has excellent soft magnetic properties, such as high electrical resistance, high relative permeability, near-zero magnetostriction, low coercive force, and low iron loss, making this alloy promising for use in high-frequency applications such as transformers, power generators, and electric relays [1,2] It is very brittle at room temperature due to the formation of ordered structures, such as B2 (Pm3 m) and DO3 (Fm3 m) phases [3,4]. % Si alloy exhibited low formability in sheet Metals both 2018, bars8,and wires from as-cast ingots. % Si alloy exhibited low formability in sheet rolling [20], systematic research on optimizing the microstructure, surface quality, and mechanical properties should be carried out to improve bar productivity. % Si bars were studied in order to obtain the optimal mechanical mechanical property combination that improves the drawing efficiency of Fe-6.5 wt. Property combination that improves the drawing efficiency of Fe-6.5 wt. % Si wires
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