Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Theoretical Study on the Consolidation Behavior and Mechanical Property for Molybdenum Powders

몰리브데늄 분말의 치밀화 거동 및 기계적 물성의 이론적 연구

  • Kim, Young-Moo (Defense Material and Evaluation Technology Directorate, Agency for Defense Development)
  • 김영무 (국방과학연구소 제4기술연구본부 국방소재기술부)
  • Published : 2008.06.28
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Abstract

In this study, consolidation behavior and hardness of commercially available molybdenum powder were investigated. In order to analyze compaction response of the powders, the elastoplastic constitutive equation based on the yield function by Shima and Oyane was applied to predict the compact density under uniaxial pressure from 100MPa to 700MPa. The compacts were sintered at $1400-1600^{\circ}C$ for 20-60 min. The sintered density and grain size of molybdenum were increased with increasing the compacting pressure and processing temperature and time. The constitutive equation, proposed by Kwon and Kim, was applied to simulate the creep densification rate and grain growth of molybdenum powder compacts. The calculated results were compared with experimental data for the powders. The effects of the porosity and grain size on the hardness of the specimens were explained based on the modified plasticity theory of porous material and Hall-Petch type equation.

Keywords

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