PROJECT TITLE (BSc, 2018-2018): Surface Cracking in Constructional Heavy Steel Plates
This research investigated root cause of the formation of surface cracks on hot rolled C-Mn constructional steel heavy plates. Cracks are rather evenly distributed over the surface in the form of colonies of cracks. Samples were cut from the heavy-plate. Microstructure of samples in the as-cast and hot-rolled states were studied using optical and electron microscopes as well as energy dispersive X-ray spectroscopy (EDS). Results show that cracks are heavily oxidized. De-carburized areas are also seen alongside cracks. The crack tip is in the form of deer-horn, indicating that crack branching has taken place during deformation. The crack initiation sites are V-shaped grooves on the surface of as-cast blooms. Correlations between microstructures, processing parameters, and crack formation are discussed.
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