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The effect of high-energy electron-beam irradiation on microstructural modification of a high-speed steel roll

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Abstract

The purpose of this study is to investigate the microstructural modification in a high-speed steel (HSS) roll irradiated with an accelerated high-energy electron beam. The HSS roll samples were irradiated at the beam travel speeds of 2.5 to 25 mm/s using an electron accelerator (1.4 MeV). The microstructure was examined with a scanning electron microscope (SEM) capable ofin situ fracture testing and simultaneous measurement of the apparent fracture toughness. Irradiation changed the matrix phase from tempered martensite to a mixture of retained austenite and martensite. Coarse primary carbides were partially or completely dissolved, depending on the heat input. Irradiation greatly improved the fracture properties because of the presence of retained austenite, which could retard crack propagation, although hardness was decreased. Occasional interior quench cracks were found in the heat-affected region. Appropriate processing methods, such as pre- or postirradiation, were suggested. A heat transfer analysis of the irradiated surface layer was also carried out to elucidate the influence of the irradiation parameters on the microstructure.

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Authors and Affiliations

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

    Dongwoo Suh (Research Assistant) & Sunghak Lee (Associate Professor)

  2. Department of Materials Science and Engineering, Pohang University of Science and Technology, 790-784, Pohang, Korea

    Yangmo Koo (Associate Professor)

  3. Roll Technology Department, Kangwon Industries, Ltd., 790-370, Pohang, Korea

    Hui Choon Lee (Assistant Manager)

Authors
  1. Dongwoo Suh
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  2. Sunghak Lee
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  3. Yangmo Koo
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  4. Hui Choon Lee
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Suh, D., Lee, S., Koo, Y. et al. The effect of high-energy electron-beam irradiation on microstructural modification of a high-speed steel roll. Metall Mater Trans A 27, 3149–3161 (1996). https://doi.org/10.1007/BF02663865

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  • DOI: https://doi.org/10.1007/BF02663865

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