발간논문

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Vol.34, No.2, 182 ~ 192, 1996
Title
Research Paper - Transformations - : Microstructural Modifiction of a Ductile Cast Iron Roll Irradiated with High - Energy Electron Beam
서동우Dong Woo Suh, 이성학Sung Hak Lee, 구양모Yang Mo Koo, 이희춘Hui Choon Lee
Abstract
The present study is concerned with microstructural analyses of the surface layer of a ductile cast iron (DCI) roll modified by irradiation of high-energy electron beam. DCI roll specimens were irradiated using an electron accelerator, and the microstructures of the irradiated surface layers were examined. As a result of irradiation, the matrix phase was changed from banite to a mixture of retained austenite and martensite, and coarse spheroidal graphites were dissolved partially under the higher heat input. The microstructural modification by the irradiation improved greatly the hardness of surface layer because of the martensitic matrix, although retained austenite was presented around the spheroidal graphite. In order to investigate the transformation mechanism, the simulation test including thermal cycles of abrupt heating and quenching was carried out. Thermal analysis of the irradiated surface layer was also carried out for understanding of microstructural modification in terms of the irradiation parameters.
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