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http://dx.doi.org/10.12656/jksht.2022.35.4.211

Effect of Repetitive Cold Rolling and Annealing on the Superplasticity of Fe-10Mn-3.5Si Alloy  

Jeong, Hyun-Bin (Department of Materials Science and Engineering, Yonsei University)
Choi, Seok-Won (Department of Materials Science and Engineering, Yonsei University)
Lee, Young-Kook (Department of Materials Science and Engineering, Yonsei University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.35, no.4, 2022 , pp. 211-219 More about this Journal
Abstract
It is known that superplastic materials with ultrafine grains have high elongation mainly due to grain boundary sliding. Therefore, in the present study we examined the influence of grain refinement, caused by a repetitive cold rolling and annealing process, on both superplastic elongation and superplastic deformation mechanism. The cold rolling and annealing process was repetitively applied up to 4 times using Fe-10Mn-3.5Si alloy. High-temperature tensile tests were conducted at 763 K with an initial strain rate of 1 × 10-3 s-1 using the specimens. The superplastic elongation increased with the number of the repetitive cold rolling and annealing process; in particular, the 4 cycled specimen exhibited the highest elongation of 372%. The primary deformation mechanism of all specimens was grain boundary sliding between recrystallized α-ferrite and reverted γ-austenite grains. The main reason for the increase in elongation with the number of the repetitive cold rolling and annealing process was the increase in fractions of fine recrystallized α-ferrite and reverted γ-austenite grains, which undergo grain boundary sliding.
Keywords
Repetitive cold rolling and annealing process; Low-temperature superplasticity; Grain boundary sliding; Medium-Mn steel; Reverse transformation;
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