Journal of Powder Materials

Hee-Soo Kang

7 Articles

Microstructural Feature and Aging Characteristics of Spray-Formed Cu-5Ni-10Sn Alloy: Dae-Gyun Roh, Hee-Soo Kang, Kyeong-Ho Baik; J Korean Powder Metall Inst. 2012;19(4):317-321.; DOI: https://doi.org/10.4150/KPMI.2012.19.4.317

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In this study, Cu-5Ni-10Sn(wt%) spinodal alloy was manufactured by gas atomization spray forming, and the microstructural features and mechanical properties of Cu-5Ni-10Sn alloy have been investigated during homogenization, cold working and age-hardening. The spray formed Cu-5Ni-10Sn alloy consisted of an equiaxed microstructure with a mixture of solid solution alpha-(CuNiSn) grains and lamellar-structure grains. Homogenization at 800°C and subsequent rapid quenching formed a uniform solid solution alpha-(CuNiSn) phase. Direct aging at 350°C from the homogenized Cu-5Ni-10Sn alloy promoted the precipitation of finely distributed gamma' or gamma-(Cu,Ni)_3Sn phase throughout the matrix, resulting in a significant increase in microhardness and tensile strength. Cold working prior to aging was effective in strengthening Cu-5Ni-10Sn alloy, which gave rise to a maximum tensile strength of 1165 MPa. Subsequent aging treatment slightly reduced the tensile strength to 1000-1100 MPa due to annealing effects.

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Improved mechanical and thermophysical properties of additively manufactured Cu-Ni-Sn-P alloy by using aging treatment
Dong-Hoon Yang, Young-Kyun Kim, Sun-Hong Park, Kee-Ahn Lee
Journal of Alloys and Compounds.2021; 875: 160050. CrossRef
Effect of post-heat treatment on the thermophysical and compressive mechanical properties of Cu-Ni-Sn alloy manufactured by selective laser melting
Young-Kyun Kim, Sun-Hong Park, Kee-Ahn Lee
Materials Characterization.2020; 162: 110194. CrossRef
Corrosion behavior of novel Cu–Ni–Al–Si alloy with super-high strength in 3.5% NaCl solution
Jia-jun ZHU, San-hua LI, Lei-nuo SHEN, Wu-lin YANG, Zhou LI
Transactions of Nonferrous Metals Society of China.2017; 27(5): 1096. CrossRef

Densification and Nanocrystallization of Water-Atomized Pure Iron Powder Using High Pressure Torsion: Eun-Yoo Yoon, Dong-Jun Lee, Ha-Neul Kim, Hee-Soo Kang, Eon-Sik Lee, Hyoung-Seop Kim; J Korean Powder Metall Inst. 2011;18(5):411-416.; DOI: https://doi.org/10.4150/KPMI.2011.18.5.411

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In this study, powder metallurgy and severe plastic deformation by high-pressure torsion (HPT) approaches were combined to achieve both full density and grain refinement at the same time. Water-atomized pure iron powders were consolidated to disc-shaped samples at room temperature using HPT of 10 GPa up to 3 turns. The resulting microstructural size decreases with increasing strain and reaches a steady-state with nanocrystalline (down to ~250 nm in average grain size) structure. The water-atomized iron powders were deformed plastically as well as fully densified, as high as 99% of relative density by high pressure, resulting in effective grain size refinements and enhanced microhardness values.

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Analyses of Densification and Consolidation of Copper Powders during High-Pressure Torsion Process Using Finite Element Method
Dong Jun Lee, Eun Yoo Yoon
Journal of Korean Powder Metallurgy Institute.2015; 22(1): 6. CrossRef
Microstructure Evolution and Mechanical Properties of Al-1080 Processed by a Combination of Equal Channel Angular Pressing and High Pressure Torsion
Mohamed Ibrahim Abd El Aal, Eun Yoo Yoon, Hyoung Seop Kim
Metallurgical and Materials Transactions A.2013; 44(6): 2581. CrossRef
Trend in Research of Powder Consolidation Using Severe Plastic Deformation
Eun Yoo Yoon, Dong Jun Lee, Dong-Hyun Ahn, Hyuk Jae Jeong, Hyoung Seop Kim
Journal of Korean Powder Metallurgy Institute.2013; 20(2): 148. CrossRef
Ultrafine Grained Cu-diamond Composites using High Pressure Torsion
Eun-Yoo Yoon, Dong-Jun Lee, Taek-Soo Kim, Hyoung-Seop Kim
Journal of Korean Powder Metallurgy Institute.2012; 19(3): 204. CrossRef
Densification of Copper Powders using High-pressure Torsion Process
Dong-Jun Lee, Eun-Yoo Yoon, Soo-Young Kang, Jung-Hwan Lee, Hyoung-Seop Kim
Journal of Korean Powder Metallurgy Institute.2012; 19(5): 333. CrossRef

Quantitative Analysis of Roughness of Powder Surface Using Three-Dimensional Laser Profiler and its Effect on Green Strength of Powder Compacts: Dong-Jun Lee, Eun-Yoo Yoon, Ha-Neul Kim, Hee-Soo Kang, Eon-Sik Lee, Hyoung-Seop Kim; J Korean Powder Metall Inst. 2011;18(5):406-410.; DOI: https://doi.org/10.4150/KPMI.2011.18.5.406

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Green strength is an important property of powders since high green strength guarantees easy and safe handling before sintering. The green strength of a powder compact is related to mainly mechanical and surface characters, governed by interlocking of the particles. In this study, the effect of powder surface roughness on the green strength of iron powders was investigated using a transverse rupture test. Three-dimensional laser profiler was employed for quantitative analyses of the surface roughness. Two different surface conditions, i.e. surface roughness, of powders were compared. The powders having rough surfaces show higher green strength than the round surface powders since higher roughness leads increasing interlocked area between the contacting powders.

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A Study on the Carbon Composite Briquette Iron Manufacturing Using Fe-containing Process Wastes
Jong Yeong Yu, Dae Young Yang, Hee Dong Shin, Il Sohn
Journal of the Korean Institute of Resources Recycling.2015; 24(3): 34. CrossRef
Obtaining Mechanical Properties of Fe Powder Using a Combined Nanoindentation and the Finite Element Method
Hyeok Jae Jeong, Dong Jun Lee, Eun Yoo Yoon, Eon Sik Lee, Nack Joon Kim, Hyeong Seop Kim
Journal of Korean Powder Metallurgy Institute.2013; 20(4): 280. CrossRef

Effect of Particle Size on Compactibility of Water-atomized Pure Iron Powder: Dong-Jun Lee, Eun-Yoo Yoon, Ha-Neul Kim, Hee-Soo Kang, Eon-Sik Lee, Hyoung-Seop Kim; J Korean Powder Metall Inst. 2011;18(3):221-225.; DOI: https://doi.org/10.4150/KPMI.2011.18.3.221

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In the current study, the effects of particle size on compaction behavior of water-atomized pure iron powders are investigated. The iron powders are assorted into three groups depending on the particle size; 20-45 µM, 75-106 µM, and 150-180 µM for the compaction experiments. The powder compaction procedures are processed with pressure of 200, 400, 600, and 800 MPa in a cylindrical die. After the compaction stage, the group having 150-180 µM of particle size distribution shows the best densification behavior and reaches the highest green density. The reason for these results can be explained by the largest average grain size in the largest particle group, due to the low plastic deformation resistance in large grain sized materials.

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Preparation of high-purity reduced iron powder by Höganäs process from ultra-pure magnetite concentrate
Jin-tian Wu, Bin Xu, Zhong-lin Dong, Yu-juan Zhou, Liang-ping Xu, Guang-hui Li, Tao Jiang
Journal of Central South University.2023; 30(9): 3006. CrossRef
Hydrogen Reduction Behavior of Oxide Scale in Water-atomized Iron Powder
Hea-Min Shin, Kyeong-Ho Baik
Journal of Korean Powder Metallurgy Institute.2014; 21(6): 422. CrossRef
Quantitative Analysis of Roughness of Powder Surface Using Three-Dimensional Laser Profiler and its Effect on Green Strength of Powder Compacts
Dong-Jun Lee, Eun-Yoo Yoon, Ha-Neul Kim, Hee-Soo Kang, Eon-Sik Lee, Hyoung-Seop Kim
Journal of Korean Powder Metallurgy Institute.2011; 18(5): 406. CrossRef

Microstructural Evolution and Tensile Properties of Cu-Sn Based Alloys Manufactured by Spray Casting Route: Sang-Hyun Shim, Hee-Soo Kang, Kyeong-Ho Baik; J Korean Powder Metall Inst. 2010;17(6):477-481.; DOI: https://doi.org/10.4150/KPMI.2010.17.6.477

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Cu-Sn based alloys were manufactured by gas atomization spray casting route in order to achieve a fine scale microstructure and a high tensile strength. The spray cast Cu-10Sn-2Ni-0.2Si alloy had an equiaxed grain microstructure, with no formation of brittle delta-Cu_41Sn_11 phase. Aging treatment promoted the precipitation of finely distributed particles corresponding to delta-Ni_2Si intermetallic phase throughout the alpha-(CuSn) matrix. The cold-rolled Cu-Sn-Ni-Si alloy had a very high tensile strength of 1200 MPa and an elongation of 5%. Subsequent aging treatment at 450°C for 1h slightly reduced the tensile strength to 700 MPa and remarkably increased the elongation up to 30%. This result has been explained by coarsening the precipitates due to over aging and reducing the dislocation density due to annealing effects.

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Co and Ti effect on hot workability of phosphor bronze
Hyeon Seok Shin, Seung Zeon Han, Eun-Ae Choi, Jee Hyuk Ahn, Sangshik Kim, Jehyun Lee
Journal of Alloys and Compounds.2022; 903: 163778. CrossRef
Microstructural Feature and Aging Characteristics of Spray-Formed Cu-5Ni-10Sn Alloy
Dae-Gyun Roh, Hee-Soo Kang, Kyeong-Ho Baik
Journal of Korean Powder Metallurgy Institute.2012; 19(4): 317. CrossRef

Microstructure and Tensile Properties of Spray Cast Cu-Sn-Ni-Si Alloy: Hee-Soo Kang, Eon-Sik Lee, Gyu-Chang Lee, Kyeong-Ho Baik; J Korean Powder Metall Inst. 2010;17(6):470-476.; DOI: https://doi.org/10.4150/KPMI.2010.17.6.470

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Abstract PDF: In this study, Cu-10Sn and Cu-10Sn-2Ni-0.2Si alloys have been manufactured by spray casting in order to achieve a fine scale microstructure and high tensile strength, and investigated in terms of microstructural evolution, aging characteristics and tensile properties. Spray cast alloys had a much lower microhardness than continuous cast billet because of an improved homogenization and an extended Sn solid solubility. Spray cast Cu-Sn-Ni-Si alloy was characterized by an equiaxed grain microstructure with a small-sized (Ni, Si)-rich precipitates. Cold rolling of Cu-Sn-Ni-Si alloy increased a tensile strength to 1220 MPa, but subsequent ageing treatment reduced a ultimate tensile strength to 780 MPa with an elongation of 18%.

Microstructural Characteristics of Thermally Sprayed WC-Co Coatings: Hee-Soo Kang, Kyeong-Ho Baik; J Korean Powder Metall Inst. 2009;16(1):56-62.; DOI: https://doi.org/10.4150/KPMI.2009.16.1.056

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Abstract PDF: The degree of WC decomposition and hardness of thermally sprayed WC-Co coatings are important factors determining the wear resistance of the coatings. In order to minimize the degree of decomposition and to increase hardness, the effects of processing parameters of high velocity oxyfuel(HVOF) spraying on various characteristics of nanostructured WC-12Co coating have been evaluated by an experimental design method. The HVOF sprayed WC-12Co coatings consisted of various carbide phases including WC, W_2C and W_3Co_3C, with a much reduced carbon content. The degree of WC decomposition and decarburization was affected by changing barrel length and spray distance. The hardness of WC-Co coatings was strongly related to droplet temperature at substrate, and increased with increasing fuel addition and/or decreasing spray distance. The effective control of processing parameters was discussed in detail for manufacturing a high performance WC-Co coating.

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