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

1
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
2
Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong 999077, China
*
Author to whom correspondence should be addressed.
Metals 2019, 9(10), 1023; https://doi.org/10.3390/met9101023
Received: 19 August 2019 / Revised: 16 September 2019 / Accepted: 18 September 2019 / Published: 20 September 2019
The microstructures and mechanical properties of the hot-rolled Fe-6.5wt.%Si sheet are analyzed. The microstructure of the hot-rolled sheet is layered along the thickness direction. The surface exhibits fine and equiaxed grains, whereas the center part shows coarse and elongated grains with a <101> fiber texture along the rolling direction. Serrated flow behavior is observed during tensile deformation of both the hot-rolled sheet and its center samples at 350 °C; thus, the serrated flow of the hot-rolled sheet is mainly attributed to the serration of the center part. The analyses of dislocation configurations, ordered structures, and crystal orientation show that the serrated flow behavior results from the interaction of solutes with mobile dislocations. Mobile dislocations are pinned by combining parallel forest dislocations with the pipe diffusion of solution atoms. This study provides a new perspective for the deformation mechanism of the Fe-6.5wt.%Si alloy. View Full-Text
Keywords: Fe-6.5wt.%Si alloy; serrated flow; forest dislocation; pipe diffusion; mobile dislocation; layered microstructure Fe-6.5wt.%Si alloy; serrated flow; forest dislocation; pipe diffusion; mobile dislocation; layered microstructure
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Shi, X.; Liang, Y.; Liu, B.; Ding, Z.; Zhang, B.; Ye, F. Serrated Flow Behavior of Hot-Rolled Fe-6.5wt.%Si Sheet with Layered Structure. Metals 2019, 9, 1023.

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