Densification and Nanocrystallization of Water-Atomized Pure Iron Powder Using High Pressure Torsion

Eun-Yoo Yoon; Dong-Jun Lee; Ha-Neul Kim; Hee-Soo Kang; Eon-Sik Lee; Hyoung-Seop Kim

doi:10.4150/KPMI.2011.18.5.411

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수분사법으로 제조된 순철 분말의 고압비틀림 성형 공정에 의한 치밀화 및 나노결정화: 윤은유, 이동준, 김하늘, 강희수, 이언식, 김형섭
Densification and Nanocrystallization of Water-Atomized Pure Iron Powder Using High Pressure Torsion: Eun-Yoo Yoon, Dong-Jun Lee, Ha-Neul Kim, Hee-Soo Kang, Eon-Sik Lee, Hyoung-Seop Kim; Journal of Korean Powder Metallurgy Institute 2011;18(5):411-416
DOI: https://doi.org/10.4150/KPMI.2011.18.5.411

¹포항공과대학교 신소재공학과
²포항공과대학교 신소재공학과
³포항산업과학연구원 신금속연구본부
⁴포항산업과학연구원 신금속연구본부
⁵포항산업과학연구원 신금속연구본부
⁶포항공과대학교 신소재공학과
¹Department of Materials Science and Engineering, POSTECH(Pohang University of Science and Technology)
²Department of Materials Science and Engineering, POSTECH(Pohang University of Science and Technology)
³New Materials Research Department, RIST
⁴New Materials Research Department, RIST
⁵New Materials Research Department, RIST
⁶Department of Materials Science and Engineering, POSTECH(Pohang University of Science and Technology)

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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: Water atomization;Pure iron powder;Densification;High pressure torsion;Severe plastic deformation;

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