발간논문

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Vol.37, No.9, 1048 ~ 1055, 1999
Title
Grain Refinement by Severe Deformation using ECAP in 0.15%C Steel
신동혁Dong Hyuk Shin,오개희Kae Hee Oh,김우진Woo Jin Kim,주웅용Wung Yong Choo
Abstract
Experiments were conducted on 0.15%C steel with an initial grain size of ∼40 ㎛ for obtaining an ultra-fine grain structure and enhanced tensile properties. ECA pressing was successfully conducted at 200℃ by designing the channel angle and the arc of curvature at the outer point of intersection of two channels properly. The Vickers hardness increased significantly by a factor of 1.6 even with a single pass. Subsequently, the hardness increased slightly after second pass. The microstructure was refined after a single pass and consisted of parallel bands of elongated subgrains. These subgrains were developed to fine grains by repeating the pass. At least for 0.15%C steel, it was possible to achieve equiaxed fine grains of ∼0.5 ㎛ by applying 2 passes such that the sample was rotated by 180℃ in the second pass.
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