Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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Fatigue Behavior of Fine Grained AM60 Magnesium Alloy Produced by Severe Plastic Deformation

강소성변형된 미세립 AM60 마그네슘 합금의 피로거동

  • You, In-Dong (Graduate School of Railroad, Seoul National University of Science and Technology) ;
  • Lee, Man-Suk (Graduate School, Seoul National University of Science and Technology) ;
  • Kim, Ho-Kyung (Department of Automotive Engineering, Seoul National University of Science and Technology)
  • 유인동 (서울과학기술대학교 철도전문대학원) ;
  • 이만석 (서울과학기술대학교 자동차공학과 대학원) ;
  • 김호경 (서울과학기술대학교 자동차공학과)
  • Received : 2011.12.14
  • Accepted : 2012.02.02
  • Published : 2012.06.30
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Abstract

The fatigue behavior of AM60 magnesium alloy produced by equal channel angular pressing(ECAP) process was investigated through fatigue lifetime and fatigue crack propagation rate tests. The grain structure of the material was refined from 19.2 ${\mu}m$ to 2.3 ${\mu}m$ after 6 passes of ECAP at 493 K. The yield strength(YS) and ultimate tensile strength (UTS) increase after two passes but decrease with further pressing, although the grain size becomes finer with increasing pass number. The softening effect due to texture anisotropy overwhelmed the strengthening effect due to grain refinement after 2 passes. A large enhancement in fatigue strength was achieved after two ECAP passes. The current finding suggests that two passed material is better than the multi-passed material in view of the static strength and fatigue performance.

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References

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