- Extraction of Vanadium Powder by Metallothermic Reduction
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Dong-Won Lee, Sang-Hyun Heo, Jong-Taek Yeom, Jei-Pil Wang
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J Korean Powder Metall Inst. 2013;20(1):43-47.
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DOI: https://doi.org/10.4150/KPMI.2013.20.1.043
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- The extraction of metallic pure vanadium powder from raw oxide has been tried by Mg-reduction. In first stage, V_2O_5 powders as initial raw material was reduced by hydrogen gas into V_2O_3 phase. V_2O_3 powder was reduced in next stage by magnesium gas at 1,073K for 24 hours. After reduction reaction, the MgO component mixed with reduced vanadium powder were dissolved and removed fully in 10% HCl solution for 5 hours at room temperature. The oxygen content and particle size of finally produced vanadium powders were 0.84 wt% and 1 µm, respectively
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Citations
Citations to this article as recorded by  - Preparation of tantalum metal powder by magnesium gas reduction of tantalum pentoxide with different initial particle size
Seon-Min Hwang, Su-Jin Park, Jei-Pil Wang, Yong-Ho Park, Dong-Won Lee
International Journal of Refractory Metals and Hard Materials.2021; 100: 105620. CrossRef - Metallic Niobium Powder Reduced by Atmospheric Magnesium Gas with Niobium Pentoxide Powder
Su-Jin Park, Seon-Min Hwang, Jei-pil Wang, Young-Guk Son, Dong-Won Lee
MATERIALS TRANSACTIONS.2021; 62(1): 34. CrossRef - Fabrication of Metallic Tantalum Powder by Magnesium-gas Reduction of Tantalum Oxide
Dong-Won Lee
Journal of Korean Powder Metallurgy Institute.2018; 25(5): 390. CrossRef - Effect of magnesium on the phase equilibria in magnesio-thermic reduction of Nb2O5
Kyunsuk Choi, Hanshin Choi, Hyunwoong Na, Il Sohn
Materials Letters.2016; 183: 151. CrossRef
- Evaluation of Mechanical Properties by Using Instrumented Indentation Testing for Resistance Spot Welds
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Chul-Young Choi, Jun-Ki Kim, Jae-Keun Hong, Jong-Taek Yeom, Yeong-Do Park
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J Korean Powder Metall Inst. 2011;18(1):64-72.
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DOI: https://doi.org/10.4150/KPMI.2011.18.1.064
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- Nondestructive instrumented indentation test is the method to evaluate the mechanical properties by analyzing load - displacement curve when forming indentation on the surface of the specimen within hundreds of micro-indentation depth. Resistance spot welded samples are known to difficult to measure the local mechanical properties due to the combination of microstructural changes with heat input. Particularly, more difficulties arise to evaluate local mechanical properties of resistance spot welds because of having narrow HAZ, as well as dramatic changed in microstructure and hardness properties across the welds. In this study, evaluation of the local mechanical properties of resistance spot welds was carried out using the characterization of Instrumented Indentation testing. Resistance spot welding were performed for 590MPa DP (Dual Phase) steels and 780MPa TRIP (Transformation Induced Plasticity) steels following ISO 18278-2 condition. Mechanical properties of base metal using tensile test and Instrumented Indentation test showed similar results. Also it is possible to measure local mechanical properties of the center of fusion zone, edge of fusion zone, HAZ and base metal regions by using instrumented indentation test. Therefore, measurement of local mechanical properties using instrumented indentation test is efficient, reliable and relatively simple technique to evaluate the tensile strength, yield strength and hardening exponent.
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Citations
Citations to this article as recorded by - Vacuum brazing of dissimilar tubular component of AA2219 and AISI 304 by a low melting Al-18Ag-20Cu-5Si-0.2Zn braze alloy
Srinivas V., Amit Kumar Singh, Gopala Krishna V., Madhusudhan Reddy G.
Journal of Materials Processing Technology.2018; 252: 1. CrossRef
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