Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Effect of Zone Annealing Velocity on the directional Recrystallization in a Ni base Oxide Dispersion Strengthened Alloys

Ni계 산화물 분산 강화 합금의 방향성 재결정에 미치는 존 어닐링 속도의 영향

  • Kim, Young-Kyun (Department of Materials Science and Engineering, Inha University) ;
  • Yoon, Seong-June (Department of Materials Science and Engineering, Inha University) ;
  • Park, Jong-Kwan (R&D Center, Korea Sintered Metal Co., Ltd.) ;
  • Kim, Hwi-Jun (Korea Institute of Industrial Technology) ;
  • Kong, Man-Sik (Institute for Advanced Engineering) ;
  • Lee, Kee-Ahn (Department of Materials Science and Engineering, Inha University)
  • Received : 2018.08.13
  • Accepted : 2018.08.17
  • Published : 2018.08.28
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Abstract

This study investigates the directional recrystallization behavior of Ni based oxide dispersion strengthened (ODS) alloy according to the zone annealing velocity. The zone annealing temperature is set as $1390^{\circ}C$, while the zone velocities are set as 2.5, 4, 6, and 10 cm/h, respectively. The initial microstructure observation of the as-extruded sample shows equiaxed grains of random orientation, with an average grain size of 530 nm. On the other hand, the zone annealed samples show a large deviation in grain size depending on the zone velocities. In particular, grains with a size of several millimeters are observed at 2.5-cm/h zone velocity. It is also found that the preferred orientation varies with the zone annealing velocity. On the basis of these results, this study discusses the role of zone velocities in the directional recrystallization of Ni base ODS alloy.

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