Microstructural evolution and mechanical properties of nanocrystalline Fe–Mn–Al–C steel processed by high-pressure torsion

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Microstructural evolution and mechanical properties of nanocrystalline Fe–Mn–Al–C steel processed by high-pressure torsion. / Jang, Gyeonghyeon; Kim, Jae Nam; Lee, Hakhyeon; Lee, Taekyung; Enikeev, Nariman; Abramova, Marina; Valiev, Ruslan Z.; Kim, Hyoung Seop; Lee, Chong Soo.

In: Materials Science and Engineering A, Vol. 827, 142073, 19.10.2021.

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

Author

Jang, Gyeonghyeon ; Kim, Jae Nam ; Lee, Hakhyeon ; Lee, Taekyung ; Enikeev, Nariman ; Abramova, Marina ; Valiev, Ruslan Z. ; Kim, Hyoung Seop ; Lee, Chong Soo. / Microstructural evolution and mechanical properties of nanocrystalline Fe–Mn–Al–C steel processed by high-pressure torsion. In: Materials Science and Engineering A. 2021 ; Vol. 827.

BibTeX

@article{e56de0f81a0b4c1cb5264a54d72d6163,

title = "Microstructural evolution and mechanical properties of nanocrystalline Fe–Mn–Al–C steel processed by high-pressure torsion",

abstract = "In this study, microstructural evolution and mechanical properties of Fe–Mn–Al–C steel were investigated with the variation of shear strain imposed by high-pressure torsion (HPT). Two different initial grain sized steels were used: (1) fine grained (FG: ≈10 μm) and (2) coarse grained (CG: ≈100 μm) steels, and the amount of strain was varied by increasing the number of revolution (R) of HPT. At the maximum R (10R) of HPT, FG and CG microstructures were refined to the average grain size of 20.7 ± 5.2 nm and 51.0 ± 11.0 nm, respectively. With increasing R, ultimate tensile strength (UTS) of both FG and CG steels increased, and however, FG 10R showed lower UTS (Δσ ≈ 350 MPa) than that of FG 5R, indicating a softening phenomenon of inverse Hall-Petch (IH–P) relation. TEM observation of the finest grained FG 10R revealed the absence of deformation twins and the formation of numerous tilt/twist nanocrystalline boundaries, which might explain the softening behavior in this regime.",

keywords = "Fe–Mn–Al–C steel, High-pressure torsion, Inverse Hall-Petch effect, Nanocrystalline steel, Stacking fault energy",

author = "Gyeonghyeon Jang and Kim, {Jae Nam} and Hakhyeon Lee and Taekyung Lee and Nariman Enikeev and Marina Abramova and Valiev, {Ruslan Z.} and Kim, {Hyoung Seop} and Lee, {Chong Soo}",

note = "Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

year = "2021",

month = oct,

day = "19",

doi = "10.1016/j.msea.2021.142073",

language = "English",

volume = "827",

journal = "Materials Science and Engineering: A",

issn = "0921-5093",

publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Microstructural evolution and mechanical properties of nanocrystalline Fe–Mn–Al–C steel processed by high-pressure torsion

AU - Jang, Gyeonghyeon

AU - Kim, Jae Nam

AU - Lee, Hakhyeon

AU - Lee, Taekyung

AU - Enikeev, Nariman

AU - Abramova, Marina

AU - Valiev, Ruslan Z.

AU - Kim, Hyoung Seop

AU - Lee, Chong Soo

PY - 2021/10/19

Y1 - 2021/10/19

N2 - In this study, microstructural evolution and mechanical properties of Fe–Mn–Al–C steel were investigated with the variation of shear strain imposed by high-pressure torsion (HPT). Two different initial grain sized steels were used: (1) fine grained (FG: ≈10 μm) and (2) coarse grained (CG: ≈100 μm) steels, and the amount of strain was varied by increasing the number of revolution (R) of HPT. At the maximum R (10R) of HPT, FG and CG microstructures were refined to the average grain size of 20.7 ± 5.2 nm and 51.0 ± 11.0 nm, respectively. With increasing R, ultimate tensile strength (UTS) of both FG and CG steels increased, and however, FG 10R showed lower UTS (Δσ ≈ 350 MPa) than that of FG 5R, indicating a softening phenomenon of inverse Hall-Petch (IH–P) relation. TEM observation of the finest grained FG 10R revealed the absence of deformation twins and the formation of numerous tilt/twist nanocrystalline boundaries, which might explain the softening behavior in this regime.

AB - In this study, microstructural evolution and mechanical properties of Fe–Mn–Al–C steel were investigated with the variation of shear strain imposed by high-pressure torsion (HPT). Two different initial grain sized steels were used: (1) fine grained (FG: ≈10 μm) and (2) coarse grained (CG: ≈100 μm) steels, and the amount of strain was varied by increasing the number of revolution (R) of HPT. At the maximum R (10R) of HPT, FG and CG microstructures were refined to the average grain size of 20.7 ± 5.2 nm and 51.0 ± 11.0 nm, respectively. With increasing R, ultimate tensile strength (UTS) of both FG and CG steels increased, and however, FG 10R showed lower UTS (Δσ ≈ 350 MPa) than that of FG 5R, indicating a softening phenomenon of inverse Hall-Petch (IH–P) relation. TEM observation of the finest grained FG 10R revealed the absence of deformation twins and the formation of numerous tilt/twist nanocrystalline boundaries, which might explain the softening behavior in this regime.

KW - Fe–Mn–Al–C steel

KW - High-pressure torsion

KW - Inverse Hall-Petch effect

KW - Nanocrystalline steel

KW - Stacking fault energy

UR - http://www.scopus.com/inward/record.url?scp=85115055718&partnerID=8YFLogxK

U2 - 10.1016/j.msea.2021.142073

DO - 10.1016/j.msea.2021.142073

M3 - Article

AN - SCOPUS:85115055718

VL - 827

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

SN - 0921-5093

M1 - 142073

ER -

ID: 97615686