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Content available Densification and Magnetic Properties of Fe Powder Compacts According to Heat-Treatment Conditions
Yoo Hyo-Sang, Kim Yong-Ho, Kim Cheol-Woo, Son Hyeon-Taek
Archives of Metallurgy and Materials
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2023
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Vol. 68, iss. 1
47--50
EN
In this study, the effects of heat-treatment conditions of Fe powder compacts on densification, microstructure, strength and magnetic properties were investigated. The prepared Fe powder was compressed in a mold of diameter 20 mm at a pressure of 800 MPa for 30 sec. This Fe powder compact was heat-treated under different atmospheres (air and 90% Ar + 10% H2 and heat-treatment temperatures (300 and 700℃). The Fe powder compacts heat-treated in an Ar+H2 mixed gas atmosphere showed a denser microstructure and higher density than the Fe powder compacts heat-treated in an air atmosphere. Oxygen content in the heat-treatment conditions played a significant role in the improvement of the densification and magnetic properties.
2
Content available Study on Improvement of Surface Properties of SKD61 Powder on S45C Using Laser Cladding
Kim Cheol-Woo, Yoo Hyo-Sang
Archives of Metallurgy and Materials
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2022
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Vol. 67, iss. 4
1465--1468
EN
In this study, we investigated the effect of cladding on structural carbon steel (S45C) using 5%Cr-1.5%Mo-Fe powder (SKD61), which is expected to show economically efficient production of die-casting parts. The process conditions were performed under argon atmosphere using a diode laser source with specialized wavelength of 900-1070 nm, and the output conditions were 3, 4, and 5 kW, respectively. After the cladding was completed, the surface coating layer’s shape and the microstructure were analyzed. The hardness test was carried out with Micro Vickers hardness tester under 500 gram-force along the normal line at the interval of 0.2 mm from the surface to core direction on the cross-sectional area. In addition, polarization curve test of the surface coating layer was performed to investigate the corrosion resistance characteristics.
3
Content available Study on Improvement of Surface Properties of Low Carbon Steel Using Laser Cladding
Kim Cheol-Woo, Yoo Hyo-Sang, Jeon Jae-Yeol, Cho Kyun-Taek, Choi Se-Weon
Archives of Metallurgy and Materials
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2021
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Vol. 66, iss. 4
1033--1036
EN
Laser cladding is a method that can be applied to repair the crack and break on the mold and die surfaces, as well as generate new attributes on the surface to improve toughness, hardness, and corrosion resistance. It is used to extend the life of the mold. It also has the advantages of superior bonding strength and precision coating on a local area compared with the conventional thermal spraying technology. In this study, we investigated the effect of cladding on low carbon alloy steel using 18%Cr-2.5%Ni-Fe powder (Rockit404), which showed high hardness on the die surface. The process conditions were performed in an argon atmosphere using a diode laser source specialized for 900-1070 nm, and the output conditions were 5, 6, and 10 kW, respectively. After the cladding was completed, the surface coating layer’s shape, the hardness according to the cross-section’s thickness, and the microstructure were analyzed.
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