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Vol.44, No.4, 243 ~ 252, 2006
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| Title |
| Hardness and Wear Resistance of (Cr3C2, CrB)/Steel Surface Composites Fabricated by High-Energy Electron Beam Irradiation |
| 남덕현 Duk Hyun Nam , 이규홍 Kyu Hong Lee , 이성학 Sung Hak Lee |
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| Abstract |
| The present study is concerned with the improvement of hardness and wear resistance in (Cr3C2,CrB)/carbon steel surface composites fabricated by high-energy electron beam irradiation. Two kinds of powder mixtures, i.e., 50Cr3C2-50STS304, 50CrB-50STS304 (wt.%), were placed on a plain carbon steel substrate, which was then irradiated with electron beam without using flux. The surface composite layer of 1.0~1.3 mm in thickness was successfully formed without defects, and contained a large amount (up to 58 vol.%) of Cr7C3 or Cr1.65Fe0.35B0.9 in the austenite or martensite matrix. The hardness and wear resistance of the surface composites layer were directly influenced by hard carbides or borides, and thus were about 2~3 times greater than those of the steel substrate. Particularly in the surface composite fabricated with CrB powders, selective wear of the matrix was considerably reduced as a number of fine borides were homogeneously distributed in the hard martensite matrix, thereby leading to the excellent wear resistance. These findings suggested that the high-energy electron beam irradiation was useful for the development of surface composites with improved hardness and wear resistance. |
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| Key Words |
| Surface composite, High-energy electron beam irradiation, Plain carbon steel, Wear Resistance, Self-fluxing |
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