몰리브데늄 분말의 치밀화 거동 및 기계적 물성의 이론적 연구
Theoretical Study on the Consolidation Behavior and Mechanical Property for Molybdenum Powders
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In this study, consolidation behavior and hardness of commercially available molybdenum pow-der were investigated. In order to analyze compaction response of the powders, the elastoplastic constitutiveequation based on the yield function by Shima and Oyane was applied to predict the compact density underuniaxial pressure from 100 MPa to 700 MPa. The compacts were sintered at 1400-1600℃ for 20-60 min. Thesintered density and grain size of molybdenum were increased with increasing the compacting pressure andprocessing temperature and time. The constitutive equation, proposed by Kwon and Kim, was applied to sim-were compared with experimental data for the powders. The effects of the porosity and grain size on the hard-ness of the specimens were explained based on the modified plasticity theory of porous material and Hall-Petchtype equation.
Abstract
In this study, consolidation behavior and hardness of commercially available molybdenum pow-der were investigated. In order to analyze compaction response of the powders, the elastoplastic constitutiveequation based on the yield function by Shima and Oyane was applied to predict the compact density underuniaxial pressure from 100 MPa to 700 MPa. The compacts were sintered at 1400-1600℃ for 20-60 min. Thesintered density and grain size of molybdenum were increased with increasing the compacting pressure andprocessing temperature and time. The constitutive equation, proposed by Kwon and Kim, was applied to sim-were compared with experimental data for the powders. The effects of the porosity and grain size on the hard-ness of the specimens were explained based on the modified plasticity theory of porous material and Hall-Petchtype equation.
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