Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Densification and Nanocrystallization of Water-Atomized Pure Iron Powder Using High Pressure Torsion

수분사법으로 제조된 순철 분말의 고압비틀림 성형 공정에 의한 치밀화 및 나노결정화

  • Yoon, Eun-Yoo (Department of Materials Science and Engineering, POSTECH(Pohang University of Science and Technology)) ;
  • Lee, Dong-Jun (Department of Materials Science and Engineering, POSTECH(Pohang University of Science and Technology)) ;
  • Kim, Ha-Neul (New Materials Research Department, RIST) ;
  • Kang, Hee-Soo (New Materials Research Department, RIST) ;
  • Lee, Eon-Sik (New Materials Research Department, RIST) ;
  • Kim, Hyoung-Seop (Department of Materials Science and Engineering, POSTECH(Pohang University of Science and Technology))
  • 윤은유 (포항공과대학교 신소재공학과) ;
  • 이동준 (포항공과대학교 신소재공학과) ;
  • 김하늘 (포항산업과학연구원 신금속연구본부) ;
  • 강희수 (포항산업과학연구원 신금속연구본부) ;
  • 이언식 (포항산업과학연구원 신금속연구본부) ;
  • 김형섭 (포항공과대학교 신소재공학과)
  • Received : 2011.06.23
  • Accepted : 2011.08.01
  • Published : 2011.10.28
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Abstract

In this study, powder metallurgy and severe plastic deformation by high-pressure torsion (HPT) approaches were combined to achieve both full density and grain refinement at the same time. Water-atomized pure iron powders were consolidated to disc-shaped samples at room temperature using HPT of 10 GPa up to 3 turns. The resulting microstructural size decreases with increasing strain and reaches a steady-state with nanocrystalline (down to ~250 nm in average grain size) structure. The water-atomized iron powders were deformed plastically as well as fully densified, as high as 99% of relative density by high pressure, resulting in effective grain size refinements and enhanced microhardness values.

Keywords

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