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Vol.43, No.9, 579 ~ 589, 2005
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| Title |
| Microstructure and Wear Resistance of Surface Composites Fabricated by High-energy Electron-beam Irradiation of Fe-based Amorphous Alloy Powders |
| 이규홍 Kyu Hong Lee , 남덕현 Duk Hyun Nam , 이성학 Sung Hak Lee , Choongnyun Paul Kim |
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| Abstract |
| This study is concerned with the fabrication of surface composites by high-energy electron-beam irradiation of Fe-based amorphous alloy powders. Fe-based amorphous powders were deposited on a plain carbon steel substrate, and then electron beam was irradiated on these powders without flux to fabricate a one-layered surface composite. A two-layered surface composite was also fabricated by irradiating electron beam again onto the powders deposited on the one-layered surface composite. The composite layers of 1.3~1.9 mm in thickness were homogeneously formed without defects, and the two-layered composite contained a large amount (up to 48 vol.%) of hard and fine Cr2B crystalline particles in the Cr0.19Fe0.7Ni0.11 matrix. The hardness and wear resistance of the surface composite layers were directly influenced by hard Cr2B particles, and thus were about 2 to 3 times greater than those of the steel substrate. Particularly in the two-layered surface composite, high-temperature hardness was maintained over 300 VHN up to 750℃, which was better than that of a coating fabricated by high-velocity oxygen fuel spraying of Fe-based amorphous powders. |
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| Key Words |
| High-energy electron beam irradiation, Surface composite, Amorphous alloy powder, Wear resistance |
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