Heterogeneous microstructure and enhanced mechanical properties in annealed multilayered IF steel

Xiaojuan Jiang, Lijuan Zhang, Ling Zhang, Tianlin Huang, Guilin Wu, Xiaoxu Huang, Oleg V. Mishin*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The microstructure and mechanical properties have been studied in interstitial free (IF) steel samples consisting of compression-bonded alternating layers of initially either cold-rolled (CR) or recrystallized (AR) material. After compression bonding followed by cold compression, the microstructure of the initial CR layers is characterized by a fine boundary spacing, while the boundary spacing in the initial AR layers is greater. Annealing of this compression-bonded sample is carried out at 600 °C to achieve a highly heterogeneous microstructure. During the early stages of annealing, coarsening is more pronounced in the CR layers leading to a more rapid reduction in the stored energy than in the AR layers. Further annealing results in recrystallization taking place preferentially in the AR layers with the consequence that the slowly recrystallizing CR layers are considerably harder than the AR layers. Tensile testing demonstrates that in this multilayered microstructure combinations of high strength and comparatively high ductility are achieved in the samples annealed at 600 °C for either 1 h or 1.5 h, when the microstructure is strongly heterogeneous with a large difference in the fraction of recrystallized material between the initial CR and AR layers. Such samples with alternating hard and soft layers are found to have a better combination of strength and ductility than other IF-steel samples with a more homogeneous microstructure. The enhanced strength in the annealed multilayered compression-bonded samples can be attributed to the influence of mechanical constraints between the layers.

Original languageEnglish
JournalMaterials Science and Engineering A
Volume759
Pages (from-to)262-271
ISSN0921-5093
DOIs
Publication statusPublished - 2019

Keywords

  • Compression bonding
  • Electron microscopy
  • Hardness
  • Iron alloys
  • Layered structure
  • Stress/strain measurements

Cite this

Jiang, Xiaojuan ; Zhang, Lijuan ; Zhang, Ling ; Huang, Tianlin ; Wu, Guilin ; Huang, Xiaoxu ; Mishin, Oleg V. / Heterogeneous microstructure and enhanced mechanical properties in annealed multilayered IF steel. In: Materials Science and Engineering A. 2019 ; Vol. 759. pp. 262-271.
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title = "Heterogeneous microstructure and enhanced mechanical properties in annealed multilayered IF steel",
abstract = "The microstructure and mechanical properties have been studied in interstitial free (IF) steel samples consisting of compression-bonded alternating layers of initially either cold-rolled (CR) or recrystallized (AR) material. After compression bonding followed by cold compression, the microstructure of the initial CR layers is characterized by a fine boundary spacing, while the boundary spacing in the initial AR layers is greater. Annealing of this compression-bonded sample is carried out at 600 °C to achieve a highly heterogeneous microstructure. During the early stages of annealing, coarsening is more pronounced in the CR layers leading to a more rapid reduction in the stored energy than in the AR layers. Further annealing results in recrystallization taking place preferentially in the AR layers with the consequence that the slowly recrystallizing CR layers are considerably harder than the AR layers. Tensile testing demonstrates that in this multilayered microstructure combinations of high strength and comparatively high ductility are achieved in the samples annealed at 600 °C for either 1 h or 1.5 h, when the microstructure is strongly heterogeneous with a large difference in the fraction of recrystallized material between the initial CR and AR layers. Such samples with alternating hard and soft layers are found to have a better combination of strength and ductility than other IF-steel samples with a more homogeneous microstructure. The enhanced strength in the annealed multilayered compression-bonded samples can be attributed to the influence of mechanical constraints between the layers.",
keywords = "Compression bonding, Electron microscopy, Hardness, Iron alloys, Layered structure, Stress/strain measurements",
author = "Xiaojuan Jiang and Lijuan Zhang and Ling Zhang and Tianlin Huang and Guilin Wu and Xiaoxu Huang and Mishin, {Oleg V.}",
year = "2019",
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Heterogeneous microstructure and enhanced mechanical properties in annealed multilayered IF steel. / Jiang, Xiaojuan; Zhang, Lijuan; Zhang, Ling; Huang, Tianlin; Wu, Guilin; Huang, Xiaoxu; Mishin, Oleg V.

In: Materials Science and Engineering A, Vol. 759, 2019, p. 262-271.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Heterogeneous microstructure and enhanced mechanical properties in annealed multilayered IF steel

AU - Jiang, Xiaojuan

AU - Zhang, Lijuan

AU - Zhang, Ling

AU - Huang, Tianlin

AU - Wu, Guilin

AU - Huang, Xiaoxu

AU - Mishin, Oleg V.

PY - 2019

Y1 - 2019

N2 - The microstructure and mechanical properties have been studied in interstitial free (IF) steel samples consisting of compression-bonded alternating layers of initially either cold-rolled (CR) or recrystallized (AR) material. After compression bonding followed by cold compression, the microstructure of the initial CR layers is characterized by a fine boundary spacing, while the boundary spacing in the initial AR layers is greater. Annealing of this compression-bonded sample is carried out at 600 °C to achieve a highly heterogeneous microstructure. During the early stages of annealing, coarsening is more pronounced in the CR layers leading to a more rapid reduction in the stored energy than in the AR layers. Further annealing results in recrystallization taking place preferentially in the AR layers with the consequence that the slowly recrystallizing CR layers are considerably harder than the AR layers. Tensile testing demonstrates that in this multilayered microstructure combinations of high strength and comparatively high ductility are achieved in the samples annealed at 600 °C for either 1 h or 1.5 h, when the microstructure is strongly heterogeneous with a large difference in the fraction of recrystallized material between the initial CR and AR layers. Such samples with alternating hard and soft layers are found to have a better combination of strength and ductility than other IF-steel samples with a more homogeneous microstructure. The enhanced strength in the annealed multilayered compression-bonded samples can be attributed to the influence of mechanical constraints between the layers.

AB - The microstructure and mechanical properties have been studied in interstitial free (IF) steel samples consisting of compression-bonded alternating layers of initially either cold-rolled (CR) or recrystallized (AR) material. After compression bonding followed by cold compression, the microstructure of the initial CR layers is characterized by a fine boundary spacing, while the boundary spacing in the initial AR layers is greater. Annealing of this compression-bonded sample is carried out at 600 °C to achieve a highly heterogeneous microstructure. During the early stages of annealing, coarsening is more pronounced in the CR layers leading to a more rapid reduction in the stored energy than in the AR layers. Further annealing results in recrystallization taking place preferentially in the AR layers with the consequence that the slowly recrystallizing CR layers are considerably harder than the AR layers. Tensile testing demonstrates that in this multilayered microstructure combinations of high strength and comparatively high ductility are achieved in the samples annealed at 600 °C for either 1 h or 1.5 h, when the microstructure is strongly heterogeneous with a large difference in the fraction of recrystallized material between the initial CR and AR layers. Such samples with alternating hard and soft layers are found to have a better combination of strength and ductility than other IF-steel samples with a more homogeneous microstructure. The enhanced strength in the annealed multilayered compression-bonded samples can be attributed to the influence of mechanical constraints between the layers.

KW - Compression bonding

KW - Electron microscopy

KW - Hardness

KW - Iron alloys

KW - Layered structure

KW - Stress/strain measurements

U2 - 10.1016/j.msea.2019.05.034

DO - 10.1016/j.msea.2019.05.034

M3 - Journal article

VL - 759

SP - 262

EP - 271

JO - Materials Science and Engineering: A - Structural Materials: Properties, Microstructure and Processing

JF - Materials Science and Engineering: A - Structural Materials: Properties, Microstructure and Processing

SN - 0921-5093

ER -