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Correlation of Microstructure, Hardness, and Fracture Toughness of Fe-Based Surface Composites Fabricated by High-Energy Electron Beam Irradiation with Fe-Based Metamorphic Alloy Powders and VC Powders

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Abstract

Iron-based surface composites were fabricated with Fe-based metamorphic alloy powders and VC powders by high-energy electron beam irradiation, and the correlation of their microstructure with hardness and fracture toughness was investigated. Mixtures of metamorphic powders and VC powders were deposited on a plain carbon steel substrate, and then the electron beam was irradiated on these powders without flux, to fabricate surface composites. The composite layers 1.3 to 1.8 mm in thickness contained a large amount (up to 47 vol pct) of hard Cr2B and V8C7 particles formed in eutectic colony regions and inside colonies, respectively. The hardness of the surface composites was approximately 2 to 4 times greater than that of the substrate because of Cr2B and V8C7 particles. According to the microfracture observation of the composite fabricated with mixing 30 wt pct VC powders, microcracks initiated at coarse V8C7 particles ins inside colonies as well as at Cr2B particles in colony regions, and were connected with other microcracks in a zigzag shape. Thus, it showed a higher fracture toughness and hardness twice as high as the composite fabricated without mixing VC powders.

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Acknowledgments

This work was supported by the National Research Laboratory Program (Grant No. ROA-2004-000-10361-0) funded by the Korea Science and Engineering Foundation (KOSEF), Daejeon, Korea. The authors are grateful to Drs. M.G. Golkovski and N. Kuksanov, Budker Institute of Nuclear Physics, and Dr. Kyuhong Lee, POSTECH, for their helpful discussion on the fabrication of the surface composites.

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Authors and Affiliations

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

    Duk-Hyun Nam (Research Assistant), Jeonghyeon Do (Research Assistant) & Sunghak Lee (Professor)

  2. Materials Science and Engineering Department, Pohang University of Science and Technology (POSTECH), Pohang, South Korea

    Sunghak Lee (Professor)

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  1. Duk-Hyun Nam
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  2. Jeonghyeon Do
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  3. Sunghak Lee
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Correspondence to Sunghak Lee.

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Manuscript submitted December 31, 2008.

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Nam, DH., Do, J. & Lee, S. Correlation of Microstructure, Hardness, and Fracture Toughness of Fe-Based Surface Composites Fabricated by High-Energy Electron Beam Irradiation with Fe-Based Metamorphic Alloy Powders and VC Powders. Metall Mater Trans A 40, 2959–2970 (2009). https://doi.org/10.1007/s11661-009-0004-1

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