| Abstract |
| The present study is concerned with fabrication and microstructural analysis of Cr₃C₂/SUS316L surface composites using high-energy electron-beam irradiation. Three kinds of powder mixtures, i.e., 50Cr₃C₂-50CaF₂(flux), 100Cr₃C₂, and 87.5Cr-12.5C (wt.%), were placed on an SUS₃16L stainless steel substrate, which was then irradiated with electron beam. In the specimens fabricated without flux powders, the surface composite layer of 3.5-4.8 mm in thickness was successfully formed without defects by the self-fluxing effect, and contained a large amount (up to 18 vol.%) of Cr_(7)C₃ carbides in the austenite matrix. The composite layer fabricated with Cr and C powders having lower melting points than Cr₃C₂ powders was thicker than that fabricated with Cr₃C₂ powders because of more effective melting of powders during electron-beam irradiation. The hardness and wear resistance of the surface composite layer were directly influenced by hard primary Cr_(7)C₃ carbides, and thus were about two times greater than those of the untreated stainless steel substrate. |
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| Key Words |
| Surface composite, High-energy electron beam irradiation, SUS316L stainless steel, Chromium carbide |
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