Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Synthesis and Microstructure of Fe-Base Superalloy Powders with Y-Oxide Dispersion by High Energy Ball Milling

고에너지 볼 밀링을 이용한 Y-산화물 분산 Fe-기초내열합금 분말의 합성 및 미세조직 특성

  • Yim, Da-Mi (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Park, Jong Kwan (R&D Center, Korea Sintered Metal Co., Ltd.) ;
  • Oh, Sung-Tag (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
  • 임다미 (서울과학기술대학교 신소재공학과) ;
  • 박종관 (대한소결금속(주) 기술연구소) ;
  • 오승탁 (서울과학기술대학교 신소재공학과)
  • Received : 2015.07.07
  • Accepted : 2015.07.17
  • Published : 2015.08.27
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Abstract

Fe-base superalloy powders with $Y_2O_3$ dispersion were prepared by high energy ball milling, followed by spark plasma sintering for consolidation. High-purity elemental powders with different Fe powder sizes of 24 and 50 mm were used for the preparation of $Fe-20Cr-4.5Al-0.5Ti-O.5Y_2O_3$ powder mixtures (wt%). The milling process of the powders was carried out in a horizontal rotary ball mill using a stainless steel vial and balls. The milling times of 1 to 5 h by constant operation (350 rpm, ball-to-powder ratio of 30:1 in weight) or cycle operation (1300 rpm for 4 min and 900 rpm for 1 min, 15:1) were applied. Microstructural observation revealed that the crystalline size of Fe decreased with an increase in milling time by cyclic operation and was about 15 nm after 3 h, forming a FeCr alloy phase. The cyclic operation had an advantage over constant milling in that a smaller-agglomerated structure was obtained. The milled powders were sintered at $1100^{\circ}C$ for 30 min in vacuum. With an increase in milling time, the sintered specimen showed a more homogeneous microstructure. In addition, a homogenous distribution of Y-compound particles in the grain boundary was confirmed by EDX analysis.

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References

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