Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Mechanical Properties of ODS Fe Alloys Produced by Mechano-Chemical Cryogenic Milling

극저온 기계화학적 밀링(Mechano-Chemical Milling)에 의해 제조된 ODS Fe 합금의 기계적 특성

  • Hahn, Sung-In (Dep’t of Advanced Materials Science & Engineering, Daejin University) ;
  • Hong, Young-Hwan (Dept. Advanced Materials Application, Suwon Science College) ;
  • Hwang, Seung-Joon (Dep’t of Advanced Materials Science & Engineering, Daejin University)
  • 한성인 (대진대학교 신소재공학과) ;
  • 홍영환 (수원과학대학교 신소재응용과) ;
  • 황승준 (대진대학교 신소재공학과)
  • Received : 2012.04.19
  • Accepted : 2012.05.18
  • Published : 2012.05.31
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Abstract

An ${\alpha}$-Ferrite (Fe) powder dispersed with 4 vol.% of $Al_2O_3$ was successfully produced by a simple miling at 210 K with a mixture of $Fe_2O_3$, Fe and Al ingredient powders, followed by 2 step high temperature consolidation: Hot Pressing (HP) at 1323 K and then Hot Isostatic Pressing at 1423 K. The microstructure of the consolidated material was characterized by standard metallographic techniques such as XRD (X-ray Diffraction), TEM and STEM-EDS. The results of STEM-EDS analysis showed that the HIPed materials comprised a mixture of pure Fe matrix with a grain size of ~20 nm and $Al_2O_3$ with a bimodal size distribution of extremely fine (~5 nm) and medium size dispersoids (~20 nm). The mechanical properties of the consolidated materials were characterized by compressive test and micro Vickers hardness test at room temperature. The results showed that the yield strength of the ODS (Oxide Dispersion Strengthened) Fe alloy are as much as $674{\pm}39$ MPa and the improvement of the yield strength is attributed to the presence of the fine $Al_2O_3$ dispersoid.

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