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

2 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

Fingerprint

tempering
Hot rolling
Steel
Tempering
steels
Water
Cold rolling
Manganese
Air
Austenite
cold rolling
Hardness
air
Annealing
austenite
high strength
Cracks
Recovery
Temperature
water

All Science Journal Classification (ASJC) codes

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

Cite this

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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.",
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Effect of auto-tempering on the cold roll-ability of medium-Mn steel. / Nam, Jae Hoon; Yu, Sang Hyun; Lee, Young Kook.

In: Materials Science and Technology (United Kingdom), Vol. 35, No. 17, 22.11.2019, p. 2069-2075.

Research output: Contribution to journalArticle

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