Ultrafine grained dual-phase martensite/ferrite steel strengthened and toughened by lamella structure

Junjie Sun; Tao Jiang; Yingjun Wang; Shengwu Guo; Yongning Liu

doi:10.1016/j.msea.2018.08.009

Ultrafine grained dual-phase martensite/ferrite steel strengthened and toughened by lamella structure

Junjie Sun
, Tao Jiang
, Yingjun Wang
, Shengwu Guo
, Yongning Liu

School of Materials Science and Engineering

Xi'an Jiaotong University

Research output: Contribution to journal › Article › peer-review

57 Scopus citations

Abstract

Grain refinement is one of the most effective methods for strengthening steels, but grain refinement to 1 µm or less deteriorates the ductility considerably. To evade the strength-ductility trade-off, a lamellar-structured (LS) ultrafine-grained (UFG) dual-phase (DP) ferrite/martensite (F/M) steel was produced by warm rolling an intercritical annealed low-carbon martensite and subsequent air cooling in this paper. The microstructure is similar to a short fiber reinforced composite, and the highest strength (1432 ± 15 MPa) combined with a decent ductility (16.5 ± 0.5% elongation) is achieved in DP steel. Compared with conventional equiaxed coarse-grained (CG) and UFG DP counterparts, the LS martensite in UFG DP steel can produce extra strengthening effect and is also beneficial to ductility. And the short fiber theory can predict the strength very well.

Original language	English
Pages (from-to)	311-317
Number of pages	7
Journal	Materials Science and Engineering: A
Volume	734
DOIs	https://doi.org/10.1016/j.msea.2018.08.009
State	Published - 12 Sep 2018

Keywords

Dual phases
Lamella structure
Mechanical properties
Steel
Ultrafine grained microstructure

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10.1016/j.msea.2018.08.009

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title = "Ultrafine grained dual-phase martensite/ferrite steel strengthened and toughened by lamella structure",

abstract = "Grain refinement is one of the most effective methods for strengthening steels, but grain refinement to 1 µm or less deteriorates the ductility considerably. To evade the strength-ductility trade-off, a lamellar-structured (LS) ultrafine-grained (UFG) dual-phase (DP) ferrite/martensite (F/M) steel was produced by warm rolling an intercritical annealed low-carbon martensite and subsequent air cooling in this paper. The microstructure is similar to a short fiber reinforced composite, and the highest strength (1432 ± 15 MPa) combined with a decent ductility (16.5 ± 0.5\% elongation) is achieved in DP steel. Compared with conventional equiaxed coarse-grained (CG) and UFG DP counterparts, the LS martensite in UFG DP steel can produce extra strengthening effect and is also beneficial to ductility. And the short fiber theory can predict the strength very well.",

keywords = "Dual phases, Lamella structure, Mechanical properties, Steel, Ultrafine grained microstructure",

author = "Junjie Sun and Tao Jiang and Yingjun Wang and Shengwu Guo and Yongning Liu",

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year = "2018",

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doi = "10.1016/j.msea.2018.08.009",

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TY - JOUR

T1 - Ultrafine grained dual-phase martensite/ferrite steel strengthened and toughened by lamella structure

AU - Sun, Junjie

AU - Jiang, Tao

AU - Wang, Yingjun

AU - Guo, Shengwu

AU - Liu, Yongning

PY - 2018/9/12

Y1 - 2018/9/12

N2 - Grain refinement is one of the most effective methods for strengthening steels, but grain refinement to 1 µm or less deteriorates the ductility considerably. To evade the strength-ductility trade-off, a lamellar-structured (LS) ultrafine-grained (UFG) dual-phase (DP) ferrite/martensite (F/M) steel was produced by warm rolling an intercritical annealed low-carbon martensite and subsequent air cooling in this paper. The microstructure is similar to a short fiber reinforced composite, and the highest strength (1432 ± 15 MPa) combined with a decent ductility (16.5 ± 0.5% elongation) is achieved in DP steel. Compared with conventional equiaxed coarse-grained (CG) and UFG DP counterparts, the LS martensite in UFG DP steel can produce extra strengthening effect and is also beneficial to ductility. And the short fiber theory can predict the strength very well.

AB - Grain refinement is one of the most effective methods for strengthening steels, but grain refinement to 1 µm or less deteriorates the ductility considerably. To evade the strength-ductility trade-off, a lamellar-structured (LS) ultrafine-grained (UFG) dual-phase (DP) ferrite/martensite (F/M) steel was produced by warm rolling an intercritical annealed low-carbon martensite and subsequent air cooling in this paper. The microstructure is similar to a short fiber reinforced composite, and the highest strength (1432 ± 15 MPa) combined with a decent ductility (16.5 ± 0.5% elongation) is achieved in DP steel. Compared with conventional equiaxed coarse-grained (CG) and UFG DP counterparts, the LS martensite in UFG DP steel can produce extra strengthening effect and is also beneficial to ductility. And the short fiber theory can predict the strength very well.

KW - Dual phases

KW - Lamella structure

KW - Mechanical properties

KW - Steel

KW - Ultrafine grained microstructure

UR - https://www.scopus.com/pages/publications/85051087237

U2 - 10.1016/j.msea.2018.08.009

DO - 10.1016/j.msea.2018.08.009

M3 - 文章

AN - SCOPUS:85051087237

SN - 0921-5093

VL - 734

SP - 311

EP - 317

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

ER -

Ultrafine grained dual-phase martensite/ferrite steel strengthened and toughened by lamella structure

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Keywords

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