Root Cause Analysis of Surface Cracks in Heavy Steel Plates during the Hot Rolling Process

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...

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Bibliographic Details
Published in:Metals (Basel ) 2019-07, Vol.9 (7), p.801
Main Authors: Bahrami, Abbas, Kiani Khouzani, Mahdi, Mokhtari, Seyed Amirmohammad, Zareh, Shahin, Yazdan Mehr, Maryam
Format: Article
Language:English
Subjects:
Carbon
Carburizing
Continuous casting
crack
Crack initiation
Crack tips
C–Mn steels
Electron microscopes
heavy plates
Hot rolling
Microscopes
Molybdenum
Process parameters
Root cause analysis
Steel construction
Steel plates
Surface cracks
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Summary: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.
ISSN:2075-4701
2075-4701
DOI:10.3390/met9070801