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.

Original languageEnglish
JournalMaterials Science and Technology (United Kingdom)
DOIs
Publication statusAccepted/In press - 2018 Jan 1

Fingerprint

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

All Science Journal Classification (ASJC) codes

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

Cite this

@article{2eeb91dbfa0947b6b3128da1afd51fb4,
title = "Effect of auto-tempering on the cold roll-ability of medium-Mn steel",
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.",
author = "Nam, {Jae Hoon} and Yu, {Sang Hyun} and Young-Kook Lee",
year = "2018",
month = "1",
day = "1",
doi = "10.1080/02670836.2018.1547474",
language = "English",
journal = "Materials Science and Technology",
issn = "0267-0836",
publisher = "Maney Publishing",

}

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), 01.01.2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effect of auto-tempering on the cold roll-ability of medium-Mn steel

AU - Nam, Jae Hoon

AU - Yu, Sang Hyun

AU - Lee, Young-Kook

PY - 2018/1/1

Y1 - 2018/1/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85057305459&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85057305459&partnerID=8YFLogxK

U2 - 10.1080/02670836.2018.1547474

DO - 10.1080/02670836.2018.1547474

M3 - Article

AN - SCOPUS:85057305459

JO - Materials Science and Technology

JF - Materials Science and Technology

SN - 0267-0836

ER -