열처리공학회지 (Journal of the Korean Society for Heat Treatment)

  • 제35권4호
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  • Pages.211-219
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  • 2022
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  • 1225-1070(pISSN)
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  • 2508-4046(eISSN)
한국열처리공학회 (The Korean Society for Heat Treatment)
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Fe-10Mn-3.5Si 합금의 초소성에 미치는 반복 냉연 및 소둔의 영향

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

  • 정현빈 (연세대학교 신소재공학과) ;
  • 최석원 (연세대학교 신소재공학과) ;
  • 이영국 (연세대학교 신소재공학과)
  • 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)
  • 투고 : 2022.07.13
  • 심사 : 2022.07.25
  • 발행 : 2022.07.30
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초록

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.

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과제정보

이 논문은 2018년도 정부(교육부)의 재원으로 한국연구재단의 지원을 받아 수행된 기초연구사업임(No. 2018R1D1A1A09083753).

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