Journal of Powder Materials

Kyeong-Ho Baik

6 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

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 Evolution of Thick Tungsten Deposit Manufactured by Atmospheric Plasma Spray Forming Route: Joo-Hyun Lim, Kyeong-Ho Baik; J Korean Powder Metall Inst. 2009;16(6):403-409.; DOI: https://doi.org/10.4150/KPMI.2009.16.6.403

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Abstract PDF: Plasma spray forming is recently explored as a near-net-shape fabrication route for ultra-high temperature metals and ceramics. In this study, monolithic tungsten has been produced using an atmospheric plasma spray forming and subsequent high temperature sintering. The spray-formed tungsten preform from different processing parameters has been evaluated in terms of metallurgical aspects, such as density, oxygen content and hardness. A well-defined lamellae structure was formed in the as-sprayed deposit by spreading of completely molten droplets, with incorporating small amounts of unmelted/partially-melted particles. Plasma sprayed tungsten deposit had 84-87% theoretical density and 0.2-0.3 wt.% oxygen content. Subsequent sintering at 2500°C promoted the formation of equiaxed grain structure and the production of dense preform up to 98% theoretical density.

Oxidation and Electrical Properties of (LaSr)(CrCo)₃Coated STS-430 Steel by Plasma Spraying: Chung-Hwan Lee, Kyeong-Tae Lim, Kyeong-Ho Baik; J Korean Powder Metall Inst. 2009;16(3):185-190.; DOI: https://doi.org/10.4150/KPMI.2009.16.3.185

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Fe-Cr steels are the most promising candidate for interconnect in solid oxide fuel cells. In this study, an effective, dense and well adherent (LaSr)(CrCo)O_3 [LSCC] coating layer was produced onto 430 stainless steel (STS-430) by atmospheric plasma spraying and the oxidation behavior as well as electrical properties of the LSCC coated STS-430 were investigated. A significant oxidation of pristine STS-430 occurred at 800°C in air environment, leading to the formation of Cr_2O_3 and FeCr_2O_4 scale layer up to sim7µm after 1200h, and consequently increased an area specific resistance of 330;mOmegacdotcm2. Although the plasma sprayed LSCC coating contained the characteristic pore network, the coated samples presented apparent advantages in reducing oxidation growth of STS-430, resulting a decrease in oxide scale thickness of sim1µm at 800°C after 1200h. The area specific resistance of the LSCC coated STS-430 was much reduced to sim7;mOmegacdotcm2 after exposure at 800°C for 1200h, compared to that of the pristine STS-403.

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Coatings Properties and Efficiency Performance of Cr-DLC Films Deposited by Hybrid Linear Ion Source for Hydraulic Gear Pump
Sun-Yong Cha, Wang-Ryeol Kim, Min-Suk Park, Se-Hun Kwon, Won-Sub Chung, Myung-Chang Kang
Journal of Korean Powder Metallurgy Institute.2010; 17(6): 456. CrossRef

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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