Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Microstructural Evolution during Hot Deformation of Molybdenum using Processing Map Approach

변형지도 모델링을 통한 몰리브데늄의 고온 변형에 따른 미세조직 변화 연구

  • Kim, Young-Moo (Defense Material and Evaluation Technology Directorate, The 4th Research and Development Institute, Agency for Defense Development) ;
  • Lee, Sung-Ho (Defense Material and Evaluation Technology Directorate, The 4th Research and Development Institute, Agency for Defense Development) ;
  • Lee, Seong (Defense Material and Evaluation Technology Directorate, The 4th Research and Development Institute, Agency for Defense Development) ;
  • Noh, Joon-Woong (Defense Material and Evaluation Technology Directorate, The 4th Research and Development Institute, Agency for Defense Development)
  • 김영무 (국방과학연구소 제4기술연구본부 국방소재기술부) ;
  • 이성호 (국방과학연구소 제4기술연구본부 국방소재기술부) ;
  • 이성 (국방과학연구소 제4기술연구본부 국방소재기술부) ;
  • 노준웅 (국방과학연구소 제4기술연구본부 국방소재기술부)
  • Published : 2008.12.28
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Abstract

The hot deformation characteristics of pure molybdenum was investigated in the temperature range of $600{\sim}1200^{\circ}C$ and strain rate range of $0.01{\sim}10.0/s$ using a Gleeble test machine. The power dissipation map for hot working was developed on the basis of the Dynamic Materials Model. According to the map, dynamic recrystallization (DRX) occurs in the temperature range of $1000{\sim}1100^{\circ}C$ and the strain rate range of $0.01{\sim}10.0/s$, which are the optimum conditions for hot working of this material. The average grain size after DRX is $5{\mu}m$. The material undergoes flow instabilities at temperatures of $900{\sim}1200^{\circ}C$ and the strain rates of $0.01{\sim}10.0/s$, as calculated by the continuum instability criterion.

Keywords

References

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  1. Microstructural Evolution during Hot Deformation of P/M Copper using Processing Map vol.19, pp.2, 2012, https://doi.org/10.4150/KPMI.2012.19.2.134