Microstructural refinement of an Fe-C alloy within the ferritic range via two different strain paths
作者： S.M. Lim , M. El Wahabi , C. Desrayaud , F. Montheillet
DOI: 10.1016/J.MSEA.2007.01.106
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摘要: Abstract One of the most popular approaches to ultrafine grain formation within bulk samples is severe plastic deformation (SPD). In this paper, refinement by two SPD techniques involving different strain paths, namely multiaxial compression (MAC) and torsion, has been investigated. A coarse-grained, high-purity iron–carbon alloy was deformed ferritic domain under cold warm working conditions large strains (≫1). Subsequent analyses orientation imaging microscopy revealed that nature extent depend upon processing route. MAC, fragmentation occurs mainly means a dense, homogeneous network low angle boundaries (LAB, 2 ≤ θ ≤ 15°) delimiting subgrains (∼1 μm), only few strain-induced high (HAB, ≥ 15°) are observed in localised regions worked samples. however, proportion HAB significantly higher (37–54%), giving rise fragmented microstructure comprising crystallites (1–2 μm).
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