On the interstitial induced lattice inhomogeneities in nitrogen-expanded austenite

Xiao Tao; Jiahui Qi; Mark Rainforth; Allan Matthews; Adrian Leyland

doi:10.1016/j.scriptamat.2020.04.045

On the interstitial induced lattice inhomogeneities in nitrogen-expanded austenite

Xiao Tao, Jiahui Qi, Mark Rainforth, Allan Matthews, Adrian Leyland

Mechanical Engineering

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

2 Citations (Scopus)

132 Downloads (Pure)

Abstract

Lattice inhomogeneities, i.e. nitrogen interstitial-induced hexagonal-close-packed martensite (HCP-ε_N) and shear bands, can form in face-centred cubic nitrogen-expanded austenite (FCC-γ_N) synthesised on Fe-Cr-Mn and Fe-Cr-Ni austenitic stainless steel (ASS) using triode-plasma nitriding (TPN). Homogenous elemental distribution between HCP-ε_Nand FCC-γ_N supports the displacive shear transformation mechanism proposed for a high-Mn, low stacking fault energy ASS under nitrogen interstitial-induced deformation. While resulting from transformation-induced plasticity, HCP-ε_N exhibits similar lattice expansion behaviour to the parent FCC-γ_N. However, inhomogeneous elemental distributions in the shear bands formed in γ_N layers on a 400°C TPN-treated high-Ni ASS indicate local migration of substitutional elements.

Original language	English
Pages (from-to)	146-151
Journal	Scripta Materialia
Volume	185
Early online date	3 May 2020
DOIs	https://doi.org/10.1016/j.scriptamat.2020.04.045
Publication status	Published - Aug 2020

Keywords

Expanded austenite
High-resolution electron microscopy (HREM)
Martensitic phase transformation
Nitriding
Shear banding

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https://www.sciencedirect.com/science/article/pii/S135964622030275XLicence: None: All rights reserved

Cite this

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title = "On the interstitial induced lattice inhomogeneities in nitrogen-expanded austenite",

abstract = "Lattice inhomogeneities, i.e. nitrogen interstitial-induced hexagonal-close-packed martensite (HCP-εN) and shear bands, can form in face-centred cubic nitrogen-expanded austenite (FCC-γN) synthesised on Fe-Cr-Mn and Fe-Cr-Ni austenitic stainless steel (ASS) using triode-plasma nitriding (TPN). Homogenous elemental distribution between HCP-εN and FCC-γN supports the displacive shear transformation mechanism proposed for a high-Mn, low stacking fault energy ASS under nitrogen interstitial-induced deformation. While resulting from transformation-induced plasticity, HCP-εN exhibits similar lattice expansion behaviour to the parent FCC-γN. However, inhomogeneous elemental distributions in the shear bands formed in γN layers on a 400°C TPN-treated high-Ni ASS indicate local migration of substitutional elements.",

keywords = "Expanded austenite, High-resolution electron microscopy (HREM), Martensitic phase transformation, Nitriding, Shear banding",

author = "Xiao Tao and Jiahui Qi and Mark Rainforth and Allan Matthews and Adrian Leyland",

year = "2020",

month = aug,

doi = "10.1016/j.scriptamat.2020.04.045",

language = "English",

volume = "185",

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journal = "Scripta Materialia",

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T1 - On the interstitial induced lattice inhomogeneities in nitrogen-expanded austenite

AU - Tao, Xiao

AU - Qi, Jiahui

AU - Rainforth, Mark

AU - Matthews, Allan

AU - Leyland, Adrian

PY - 2020/8

Y1 - 2020/8

N2 - Lattice inhomogeneities, i.e. nitrogen interstitial-induced hexagonal-close-packed martensite (HCP-εN) and shear bands, can form in face-centred cubic nitrogen-expanded austenite (FCC-γN) synthesised on Fe-Cr-Mn and Fe-Cr-Ni austenitic stainless steel (ASS) using triode-plasma nitriding (TPN). Homogenous elemental distribution between HCP-εN and FCC-γN supports the displacive shear transformation mechanism proposed for a high-Mn, low stacking fault energy ASS under nitrogen interstitial-induced deformation. While resulting from transformation-induced plasticity, HCP-εN exhibits similar lattice expansion behaviour to the parent FCC-γN. However, inhomogeneous elemental distributions in the shear bands formed in γN layers on a 400°C TPN-treated high-Ni ASS indicate local migration of substitutional elements.

AB - Lattice inhomogeneities, i.e. nitrogen interstitial-induced hexagonal-close-packed martensite (HCP-εN) and shear bands, can form in face-centred cubic nitrogen-expanded austenite (FCC-γN) synthesised on Fe-Cr-Mn and Fe-Cr-Ni austenitic stainless steel (ASS) using triode-plasma nitriding (TPN). Homogenous elemental distribution between HCP-εN and FCC-γN supports the displacive shear transformation mechanism proposed for a high-Mn, low stacking fault energy ASS under nitrogen interstitial-induced deformation. While resulting from transformation-induced plasticity, HCP-εN exhibits similar lattice expansion behaviour to the parent FCC-γN. However, inhomogeneous elemental distributions in the shear bands formed in γN layers on a 400°C TPN-treated high-Ni ASS indicate local migration of substitutional elements.

KW - Expanded austenite

KW - High-resolution electron microscopy (HREM)

KW - Martensitic phase transformation

KW - Nitriding

KW - Shear banding

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U2 - 10.1016/j.scriptamat.2020.04.045

DO - 10.1016/j.scriptamat.2020.04.045

M3 - Article

SN - 1359-6462

VL - 185

SP - 146

EP - 151

JO - Scripta Materialia

JF - Scripta Materialia

ER -

On the interstitial induced lattice inhomogeneities in nitrogen-expanded austenite

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Keywords

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