- Microstructural Evolution during Hot Deformation of P/M Copper using Processing Map
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Soo-Ho Chang, Young-Moo Kim, Kyung-Chae Park
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J Korean Powder Metall Inst. 2012;19(2):134-139.
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DOI: https://doi.org/10.4150/KPMI.2012.19.2.134
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- P/M coppers are subjected to the isothermal compression tests at the strain rate ranging from 0.01 to 10.0 s-1 and the temperature from 200 to 800°C. The processing map reveals the dynamic recrystallization (DRX) domain in the following temperature and strain rate ranges: 600-800°C and 0.01-10.0 s-1, respectively. In the domain, the region at temperature of 600°C and strain rate of 10-2s-1 shows peak efficiency. From the kinetic analysis, the apparent activation energy in the DRX domain is 190.67 kJ/mol and it suggests that lattice self-diffusion is the rate controlling mechanism.
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Citations
Citations to this article as recorded by  - High Temperature Deformation and Microstructural Evolution of Homogenized AA 2026 Alloy
HyeonWoo Kang, SooBin Kim, ByoungLok Jang, HeeKook Kim
Korean Journal of Metals and Materials.2023; 61(5): 338. CrossRef - Hot Deformation Behavior and Microstructural Evolution of Powder Metallurgy Ti-6Al-4V Alloy
Youngmoo Kim, Young-Beom Song, Sung Ho Lee, Young-Sam Kwon
Journal of Korean Powder Metallurgy Institute.2014; 21(4): 277. CrossRef
- Microstructural Evolution during Hot Deformation of Molybdenum using Processing Map Approach
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Young-Moo Kim, Sung-Ho Lee, Seong Lee, Joon-Woong Noh
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J Korean Powder Metall Inst. 2008;15(6):458-465.
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DOI: https://doi.org/10.4150/KPMI.2008.15.6.458
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- The hot deformation characteristics of pure molybdenum was investigated in the temperature range of 600sim1200°C and strain rate range of 0.01sim10.0/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 1000sim1100°C and the strain rate range of 0.01sim10.0/s, which are the optimum conditions for hot working of this material. The average grain size after DRX is 5µm. The material undergoes flow instabilities at temperatures of 900sim1200°C and the strain rates of 0.01sim10.0/s, as calculated by the continuum instability criterion.
- Theoretical Study on the Consolidation Behavior and Mechanical Property for Molybdenum Powders
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Young-Moo Kim
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J Korean Powder Metall Inst. 2008;15(3):214-220.
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DOI: https://doi.org/10.4150/KPMI.2008.15.3.214
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- 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°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.
- Application of Refractory Metal Powders to Military Material Fields
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Young-Moo Kim, Eun-Pyo Kim, Seong Lee, Joon-Woong Noh
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J Korean Powder Metall Inst. 2007;14(4):221-229.
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DOI: https://doi.org/10.4150/KPMI.2007.14.4.221
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Citations to this article as recorded by - Synthesis and Nucleation Behavior of MoO3 Nano Particles with Concentration of Precursors
Seyoung Lee, Namhun Kwon, Jaeseok Roh, Kun-Jae Lee
Journal of Korean Powder Metallurgy Institute.2020; 27(5): 394. CrossRef - Fabrication of Ultra Fine Grained Molybdenum and Mechanical Properties
Se-Hoon Kim, Young-Ik Seo, Dae-Gun Kim, Myung-Jin Suk, Young-Do Kim
Journal of Korean Powder Metallurgy Institute.2010; 17(3): 235. CrossRef
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