Fabrication of ultrafine grained ferrite/martensite dual phase steel by severe plastic deformation

Kyung Tae Park, Young-Kook Lee, Dong Hyuk Shin

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

Processing of ultrafine grained ferrite/martensite dual phase (UFG F/M DP) steel by equal channel angular pressing (ECAP) and subsequent intercritical annealing was described in detail. Along with strain gradient plasticity concept in which an introduction of a high density of geometrically necessary dislocations attributes to enhance strain hardenability, the aim of the present study was fabrication of UFG F/M DP steel exhibiting extensive strain hardenability, which other UFG materials hardly exhibit, in addition to ultrahigh strength and good uniform elongation. By selecting the optimum ECAP and intercritical annealing conditions, it was possible to fabricate UFG F/M DP steel in which isolated UFG martensite islands were uniformly embedded into UFG ferrite matrix. The formation of such a unique microstructure under the present processing conditions was discussed in terms of microstructural evolution during ECAP. Room temperature tensile properties of UFG F/M DP steel were superior to those of coarse grained counterpart. More importantly, in spite of an UFG structure, the present UFG F/M DP steel exhibited extensive strain hardenability from the onset of plastic deformation in association with grain size independent strain gradient plasticity, unlike other UFG materials.

Original languageEnglish
Pages (from-to)750-755
Number of pages6
JournalISIJ International
Volume45
Issue number5
DOIs
Publication statusPublished - 2005 Aug 1

Fingerprint

Steel
Martensite
Ferrite
Plastic deformation
Equal channel angular pressing
Fabrication
Plasticity
Annealing
Microstructural evolution
Processing
Tensile properties
Elongation
Ultrafine
Microstructure
Temperature

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

@article{a4075cdf2efe4ec4a6f287bb56124d8e,
title = "Fabrication of ultrafine grained ferrite/martensite dual phase steel by severe plastic deformation",
abstract = "Processing of ultrafine grained ferrite/martensite dual phase (UFG F/M DP) steel by equal channel angular pressing (ECAP) and subsequent intercritical annealing was described in detail. Along with strain gradient plasticity concept in which an introduction of a high density of geometrically necessary dislocations attributes to enhance strain hardenability, the aim of the present study was fabrication of UFG F/M DP steel exhibiting extensive strain hardenability, which other UFG materials hardly exhibit, in addition to ultrahigh strength and good uniform elongation. By selecting the optimum ECAP and intercritical annealing conditions, it was possible to fabricate UFG F/M DP steel in which isolated UFG martensite islands were uniformly embedded into UFG ferrite matrix. The formation of such a unique microstructure under the present processing conditions was discussed in terms of microstructural evolution during ECAP. Room temperature tensile properties of UFG F/M DP steel were superior to those of coarse grained counterpart. More importantly, in spite of an UFG structure, the present UFG F/M DP steel exhibited extensive strain hardenability from the onset of plastic deformation in association with grain size independent strain gradient plasticity, unlike other UFG materials.",
author = "Park, {Kyung Tae} and Young-Kook Lee and Shin, {Dong Hyuk}",
year = "2005",
month = "8",
day = "1",
doi = "10.2355/isijinternational.45.750",
language = "English",
volume = "45",
pages = "750--755",
journal = "ISIJ International",
issn = "0915-1559",
publisher = "Iron and Steel Institute of Japan",
number = "5",

}

Fabrication of ultrafine grained ferrite/martensite dual phase steel by severe plastic deformation. / Park, Kyung Tae; Lee, Young-Kook; Shin, Dong Hyuk.

In: ISIJ International, Vol. 45, No. 5, 01.08.2005, p. 750-755.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Fabrication of ultrafine grained ferrite/martensite dual phase steel by severe plastic deformation

AU - Park, Kyung Tae

AU - Lee, Young-Kook

AU - Shin, Dong Hyuk

PY - 2005/8/1

Y1 - 2005/8/1

N2 - Processing of ultrafine grained ferrite/martensite dual phase (UFG F/M DP) steel by equal channel angular pressing (ECAP) and subsequent intercritical annealing was described in detail. Along with strain gradient plasticity concept in which an introduction of a high density of geometrically necessary dislocations attributes to enhance strain hardenability, the aim of the present study was fabrication of UFG F/M DP steel exhibiting extensive strain hardenability, which other UFG materials hardly exhibit, in addition to ultrahigh strength and good uniform elongation. By selecting the optimum ECAP and intercritical annealing conditions, it was possible to fabricate UFG F/M DP steel in which isolated UFG martensite islands were uniformly embedded into UFG ferrite matrix. The formation of such a unique microstructure under the present processing conditions was discussed in terms of microstructural evolution during ECAP. Room temperature tensile properties of UFG F/M DP steel were superior to those of coarse grained counterpart. More importantly, in spite of an UFG structure, the present UFG F/M DP steel exhibited extensive strain hardenability from the onset of plastic deformation in association with grain size independent strain gradient plasticity, unlike other UFG materials.

AB - Processing of ultrafine grained ferrite/martensite dual phase (UFG F/M DP) steel by equal channel angular pressing (ECAP) and subsequent intercritical annealing was described in detail. Along with strain gradient plasticity concept in which an introduction of a high density of geometrically necessary dislocations attributes to enhance strain hardenability, the aim of the present study was fabrication of UFG F/M DP steel exhibiting extensive strain hardenability, which other UFG materials hardly exhibit, in addition to ultrahigh strength and good uniform elongation. By selecting the optimum ECAP and intercritical annealing conditions, it was possible to fabricate UFG F/M DP steel in which isolated UFG martensite islands were uniformly embedded into UFG ferrite matrix. The formation of such a unique microstructure under the present processing conditions was discussed in terms of microstructural evolution during ECAP. Room temperature tensile properties of UFG F/M DP steel were superior to those of coarse grained counterpart. More importantly, in spite of an UFG structure, the present UFG F/M DP steel exhibited extensive strain hardenability from the onset of plastic deformation in association with grain size independent strain gradient plasticity, unlike other UFG materials.

UR - http://www.scopus.com/inward/record.url?scp=22544452703&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=22544452703&partnerID=8YFLogxK

U2 - 10.2355/isijinternational.45.750

DO - 10.2355/isijinternational.45.750

M3 - Article

VL - 45

SP - 750

EP - 755

JO - ISIJ International

JF - ISIJ International

SN - 0915-1559

IS - 5

ER -