The effect of austenite grain size on deformation mechanism of Fe–17Mn steel

Jin Young Lee; Jin Sung Hong; Seok Hyeon Kang; Young Kook Lee

doi:10.1016/j.msea.2021.140972

The effect of austenite grain size on deformation mechanism of Fe–17Mn steel

Jin Young Lee, Jin Sung Hong, Seok Hyeon Kang, Young Kook Lee

Department of Materials Science and Engineering

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

11 Citations (Scopus)

Abstract

The transition of deformation mechanism from transformation-induced plasticity (TRIP) to twinning-induced plasticity (TWIP) was investigated in a viewpoint of γ-austenite grain size (AGS) using Fe–17Mn steel. When the AGS decreased from 51.72 μm to 0.75 μm, the apparent stacking fault energy (SFE) value increased from 10.8 mJ/m² to 23.4 mJ/m². The transition of deformation mechanism from TRIP to TWIP occurred at the late stage of tensile strain in ultrafine-grained specimens with high apparent SFE values (>23.1 mJ/m²). This result matches well with the fact that a critical AGS for the transition of deformation mechanism is ~0.52 μm, which was calculated from the relationships between AGS and critical resolved shear stresses for mechanical twinning (τ_twin) and ε-martensitic transformation (τ_ε-mart). UFG specimens with the AGSs below 1.12 μm exhibited a two-step rise at the stage II of strain hardening rate curves due to active mechanical twinning and possessed high tensile strength without a great loss of elongation.

Original language	English
Article number	140972
Journal	Materials Science and Engineering A
Volume	809
DOIs	https://doi.org/10.1016/j.msea.2021.140972
Publication status	Published - 2021 Mar 30

Bibliographical note

Funding Information:
This work was supported by a Korea Institute for Advancement of Technology grant, funded by the Korea Government (MOITE) (P0002019), as part of the Competency Development Program for Industry Specialists.

Publisher Copyright:
© 2021 Elsevier B.V.

All Science Journal Classification (ASJC) codes

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

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10.1016/j.msea.2021.140972

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title = "The effect of austenite grain size on deformation mechanism of Fe–17Mn steel",

abstract = "The transition of deformation mechanism from transformation-induced plasticity (TRIP) to twinning-induced plasticity (TWIP) was investigated in a viewpoint of γ-austenite grain size (AGS) using Fe–17Mn steel. When the AGS decreased from 51.72 μm to 0.75 μm, the apparent stacking fault energy (SFE) value increased from 10.8 mJ/m2 to 23.4 mJ/m2. The transition of deformation mechanism from TRIP to TWIP occurred at the late stage of tensile strain in ultrafine-grained specimens with high apparent SFE values (>23.1 mJ/m2). This result matches well with the fact that a critical AGS for the transition of deformation mechanism is ~0.52 μm, which was calculated from the relationships between AGS and critical resolved shear stresses for mechanical twinning (τtwin) and ε-martensitic transformation (τε-mart). UFG specimens with the AGSs below 1.12 μm exhibited a two-step rise at the stage II of strain hardening rate curves due to active mechanical twinning and possessed high tensile strength without a great loss of elongation.",

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note = "Funding Information: This work was supported by a Korea Institute for Advancement of Technology grant, funded by the Korea Government (MOITE) (P0002019), as part of the Competency Development Program for Industry Specialists. Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

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AU - Lee, Young Kook

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PY - 2021/3/30

Y1 - 2021/3/30

N2 - The transition of deformation mechanism from transformation-induced plasticity (TRIP) to twinning-induced plasticity (TWIP) was investigated in a viewpoint of γ-austenite grain size (AGS) using Fe–17Mn steel. When the AGS decreased from 51.72 μm to 0.75 μm, the apparent stacking fault energy (SFE) value increased from 10.8 mJ/m2 to 23.4 mJ/m2. The transition of deformation mechanism from TRIP to TWIP occurred at the late stage of tensile strain in ultrafine-grained specimens with high apparent SFE values (>23.1 mJ/m2). This result matches well with the fact that a critical AGS for the transition of deformation mechanism is ~0.52 μm, which was calculated from the relationships between AGS and critical resolved shear stresses for mechanical twinning (τtwin) and ε-martensitic transformation (τε-mart). UFG specimens with the AGSs below 1.12 μm exhibited a two-step rise at the stage II of strain hardening rate curves due to active mechanical twinning and possessed high tensile strength without a great loss of elongation.

AB - The transition of deformation mechanism from transformation-induced plasticity (TRIP) to twinning-induced plasticity (TWIP) was investigated in a viewpoint of γ-austenite grain size (AGS) using Fe–17Mn steel. When the AGS decreased from 51.72 μm to 0.75 μm, the apparent stacking fault energy (SFE) value increased from 10.8 mJ/m2 to 23.4 mJ/m2. The transition of deformation mechanism from TRIP to TWIP occurred at the late stage of tensile strain in ultrafine-grained specimens with high apparent SFE values (>23.1 mJ/m2). This result matches well with the fact that a critical AGS for the transition of deformation mechanism is ~0.52 μm, which was calculated from the relationships between AGS and critical resolved shear stresses for mechanical twinning (τtwin) and ε-martensitic transformation (τε-mart). UFG specimens with the AGSs below 1.12 μm exhibited a two-step rise at the stage II of strain hardening rate curves due to active mechanical twinning and possessed high tensile strength without a great loss of elongation.

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The effect of austenite grain size on deformation mechanism of Fe–17Mn steel

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