Root cause analysis of surface cracks in heavy steel plates during the hot rolling process
Abbas Bahrami (Isfahan University of Technology)
Mahdi Kiani Khouzani (Isfahan University of Technology)
Seyed Amirmohammad Mokhtari (Isfahan University of Technology)
Shahin Zareh (Hormozgan Steel Company (HOSCO))
Maryam Yazdan Mehr (TU Delft - Electronic Components, Technology and Materials)
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Abstract
This paper investigates the 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. The 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 a 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 slabs. Correlations between microstructures, processing parameters, and crack formation are discussed.
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