Effect of auto-tempering on the cold roll-ability of medium-Mn steel

Jae Hoon Nam, Sang Hyun Yu, Young Kook Lee

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Recently, medium-Mn steels have attracted attention for high-strength automotive components. However, because they exhibit martensitic microstructure at room temperature, low cold roll-ability is concerned so that annealing or tempering is often performed before cold rolling. Therefore, we investigated whether cold roll-ability can be improved by adjusting coiling condition in the hot rolling process. For comparison, some specimens were water-quenched or air-cooled after hot rolling. While the water-quenched specimen revealed cracks at ∼30% cold reduction, air-cooled and coiling-simulated specimens at high reductions above ∼68%. This is because the latter had lower and wider ranged hardness values compared to the former due to partial auto-tempering occurring after coiling. The higher coiling temperature caused higher cold roll-ability probably due to the active recovery of austenite. This paper is part of a Thematic Issue on Medium Manganese Steels.

Original languageEnglish
Pages (from-to)2069-2075
Number of pages7
JournalMaterials Science and Technology (United Kingdom)
Volume35
Issue number17
DOIs
Publication statusPublished - 2019 Nov 22

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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