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Hydrogen-Induced Micro-Strain Evolution in Super Duplex Stainless Steel—Correlative High-Energy X-Ray Diffraction, Electron Backscattered Diffraction, and Digital Image Correlation

Örnek, Cem ; Müller, Timo ; Şeşen, Bilgehan M. ; Kivisäkk, Ulf ; Zhang, Fan ; Långberg, Marie ; Lienert, Ulrich ; Jeromin, Arno ; Keller, Thomas F. and Lundgren, Edvin LU , et al. (2022) In Frontiers in Materials 8.
Abstract

The local lattice strain evolution during electrochemical hydrogen charging and mechanical loading in 25Cr-7Ni super duplex stainless steel were measured in-situ using synchrotron high-energy x-ray diffraction. Post-mortem electron backscattered diffraction analysis showed that the austenite phase underwent plastic deformation in the near-surface due to hydrogen-enhanced localized plasticity, where the ferrite phase experienced hardening. In bulk regions, the ferrite was the softer phase, and the austenite remained stiff. Digital image correlation of micrographs recorded, in-situ, during mechanical tensile testing revealed intensified plastic strain localization in the austenite phase, which eventually led to crack initiation. The... (More)

The local lattice strain evolution during electrochemical hydrogen charging and mechanical loading in 25Cr-7Ni super duplex stainless steel were measured in-situ using synchrotron high-energy x-ray diffraction. Post-mortem electron backscattered diffraction analysis showed that the austenite phase underwent plastic deformation in the near-surface due to hydrogen-enhanced localized plasticity, where the ferrite phase experienced hardening. In bulk regions, the ferrite was the softer phase, and the austenite remained stiff. Digital image correlation of micrographs recorded, in-situ, during mechanical tensile testing revealed intensified plastic strain localization in the austenite phase, which eventually led to crack initiation. The absorption of hydrogen caused strain localization to occur primarily in austenite grains.

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type
Contribution to journal
publication status
published
subject
keywords
correlative microstructure characterization, digital image correlation, high-energy x-ray diffraction, hydrogen embrittlement, lattice strain, strain localization, super duplex stainless steel, synchrotron radiation
in
Frontiers in Materials
volume
8
article number
793120
publisher
Frontiers Media S. A.
external identifiers
  • scopus:85123192999
ISSN
2296-8016
DOI
10.3389/fmats.2021.793120
language
English
LU publication?
yes
id
805454f8-1278-4c08-95f9-cb0fbc82753f
date added to LUP
2022-05-13 08:49:36
date last changed
2023-11-24 09:20:00
@article{805454f8-1278-4c08-95f9-cb0fbc82753f,
  abstract     = {{<p>The local lattice strain evolution during electrochemical hydrogen charging and mechanical loading in 25Cr-7Ni super duplex stainless steel were measured in-situ using synchrotron high-energy x-ray diffraction. Post-mortem electron backscattered diffraction analysis showed that the austenite phase underwent plastic deformation in the near-surface due to hydrogen-enhanced localized plasticity, where the ferrite phase experienced hardening. In bulk regions, the ferrite was the softer phase, and the austenite remained stiff. Digital image correlation of micrographs recorded, in-situ, during mechanical tensile testing revealed intensified plastic strain localization in the austenite phase, which eventually led to crack initiation. The absorption of hydrogen caused strain localization to occur primarily in austenite grains.</p>}},
  author       = {{Örnek, Cem and Müller, Timo and Şeşen, Bilgehan M. and Kivisäkk, Ulf and Zhang, Fan and Långberg, Marie and Lienert, Ulrich and Jeromin, Arno and Keller, Thomas F. and Lundgren, Edvin and Pan, Jinshan}},
  issn         = {{2296-8016}},
  keywords     = {{correlative microstructure characterization; digital image correlation; high-energy x-ray diffraction; hydrogen embrittlement; lattice strain; strain localization; super duplex stainless steel; synchrotron radiation}},
  language     = {{eng}},
  month        = {{01}},
  publisher    = {{Frontiers Media S. A.}},
  series       = {{Frontiers in Materials}},
  title        = {{Hydrogen-Induced Micro-Strain Evolution in Super Duplex Stainless Steel—Correlative High-Energy X-Ray Diffraction, Electron Backscattered Diffraction, and Digital Image Correlation}},
  url          = {{http://dx.doi.org/10.3389/fmats.2021.793120}},
  doi          = {{10.3389/fmats.2021.793120}},
  volume       = {{8}},
  year         = {{2022}},
}