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Correlation of microstructure with hardness and wear resistance in (TiC, SiC)/stainless steel surface composites fabricated by high-energy electron-beam irradiation

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Abstract

Stainless-steel-based surface composites reinforced with TiC and SiC carbides were fabricated by high-energy electron beam irradiation. Four types of powder/flux mixtures, i.e., TiC, (Ti+C), SiC, and (Ti+SiC) powders with 40 wt. pct of CaF2 flux, were deposited evenly on an AISI 304 stainless steel substrate, which was then irradiated with an electron beam. TiC agglomerates and pores were found in the surface composite layer fabricated with TiC powders because of insufficient melting of TiC powders. In the composite layer fabricated with Ti and C powders having lower melting points than TiC powders, a number of primary TiC carbides were precipitated while very few TiC agglomerates or pores were formed. This indicated that more effective TiC precipitation was obtained from the melting of Ti and C powders than of TiC powders. A large amount of precipitates such as TiC and Cr7C3 improved the hardness, high-temperature hardness, and wear resistance of the surface composite layer two to three times greater than that of the stainless steel substrate. In particular, the surface composite fabricated with SiC powders had the highest volume fraction of Cr7C3 distributed along solidification cell boundaries, and thus showed the best hardness, high-temperature hardness, and wear resistance.

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Authors and Affiliations

  1. Center for Advanced Aerospace Materials, Pohang University of Science and Technology, 790-784, Pohang, Korea

    Eunsub Yun (Research Assistant) & Yong Chan Kim (Postdoctoral Assistant)

  2. Center for Advanced Aerospace Materials, Pohang University of Science and Technology, 790-784, Pohang, Korea

    Sunghak Lee (Professor) & Nack J. Kim (Professor)

  3. Materials Science and Engineering Department, Pohang University of Science and Technology, Pohang, KOrea

    Sunghak Lee (Professor) & Nack J. Kim (Professor)

Authors
  1. Eunsub Yun
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  2. Yong Chan Kim
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  3. Sunghak Lee
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  4. Nack J. Kim
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Yun, E., Kim, Y.C., Lee, S. et al. Correlation of microstructure with hardness and wear resistance in (TiC, SiC)/stainless steel surface composites fabricated by high-energy electron-beam irradiation. Metall Mater Trans A 35, 1029–1038 (2004). https://doi.org/10.1007/s11661-004-1006-7

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  • DOI: https://doi.org/10.1007/s11661-004-1006-7

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