Fabrication Technology and Material Characterization of Hot Rolled Cylindrical Fe-6.5 wt. % Si Bars

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 DO 3 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 DO 3 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.

Serrated Flow Behavior of Hot-Rolled Fe-6.5wt.%Si Sheet with Layered Structure

“…The Fe-6.5wt.%Si alloy is a body centered cubic (BCC) alloy together with B2 (FeSi) or D0 3 (Fe 3 Si) ordered structures [14]. Recently, Honjo et al [15][16][17] studied the serrated plastic flow of L1 2 -type ordered intermetallics, including Ni 3 (Si, Ti), Ni 3 Al, and Co 3 Ti alloys, at intermediate temperature.…”

Serrated Flow Behavior of Hot-Rolled Fe-6.5wt.%Si Sheet with Layered Structure

“…The Fe-6.5wt.%Si alloy is a body centered cubic (BCC) alloy together with B2 (FeSi) or D03 (Fe3Si) ordered structures [14]. Recently, Honjo et al [15][16][17] studied the serrated plastic flow of L12-type ordered intermetallics, including Ni3(Si, Ti), Ni3Al, and Co3Ti alloys, at intermediate temperature.…”