Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Microscopic Investigation of the Strain Rate Hardening for Polycrystalline Metals

철강재료 변형률속도 경화의 미시적 관찰

  • 윤종헌 (한국과학기술원 기계항공시스템학부) ;
  • 박찬경 (포항공과대학교 신소재공학과) ;
  • 강주석 (포항공과대학교 신소재공학과) ;
  • 서주형 (포항공과대학교 신소재공학과) ;
  • 허무영 (고려대학교 신소재공학부) ;
  • 강형구 (고려대학교 신소재공학부) ;
  • 허훈 (한국과학기술원 기계공학과)
  • Published : 2008.02.01
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Abstract

Polycrystalline materials such as steels(BCC) and aluminum alloys(FCC) show the strain hardening and the strain rate hardening during the plastic deformation. The strain hardening is induced by deformation resistance of dislocation glide on some crystallographic systems and increase of the dislocation density on grain boundaries or inner grain. However, the phenomenon of the strain rate hardening is not demonstrated distinctly in the rage of $10^{-2}$ to $10^2/sec$ strain rate. In this paper, tensile tests for various strain rates are performed in the rage of $10^{-2}$ to $10^2/sec$ then, specimens are extracted on the same strain position to investigate the microscopic behavior of deformed materials. The extracted specimens are investigated by using the electron backscattered diffraction(EBSD) and transmission electron microscopy(TEM) results which show the effect of texture orientation, grain size and dislocation behavior on the strain rate hardening.

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References

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  1. Dynamic tensile behavior of twinning-induced plasticity/low-carbon (TWIP/LC) steel clad sheets bonded by hot rolling vol.700, 2017, https://doi.org/10.1016/j.msea.2017.06.003