Root cause analysis of surface cracks in heavy steel plates during the hot rolling process

Abbas Bahrami, Mahdi Kiani Khouzani, Seyed Amirmohammad Mokhtari, Shahin Zareh, Maryam Yazdan Mehr

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)
28 Downloads (Pure)

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.

Original languageEnglish
Article number801
Pages (from-to)1-11
Number of pages11
JournalMetals
Volume9
Issue number7
DOIs
Publication statusPublished - 1 Jul 2019

Keywords

  • crack
  • C–Mn steels
  • heavy plates
  • hot rolling

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