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Uncovering temperature-tempted coordination of inclusions within ultra-high-strength-steel via in-situ spectro-microscopy

Rani, Ekta ; Singh, Harishchandra ; Alatarvas, Tuomas ; Kharbach, Mourad ; Cao, Wei ; Sarpi, Brice LU ; Zhu, Lin LU orcid ; Niu, Yuran LU ; Zakharov, Alexei LU and Fabritius, Timo , et al. (2022) In Journal of Materials Research and Technology 17. p.2333-2342
Abstract

Despite the common challenge of investigating non-metallic inclusions within ultra-high-strength-steel (UHSS) at sub-micrometer scale via conventional methods, probing nitride inclusions at elevated temperatures is vital for guiding steel’ performance. Herein, an in-situ spectro-microscopic determination using advanced Synchrotron X-ray absorption spectroscopy (XAS) coupled with photoelectron emission microscopy (PEEM) is employed to explore the local structure and electronic properties of selective h-boron nitride (h-BN) containing inclusions (A1 and A2) embedded within steel matrix. While the variation in the relative intensity of π∗/σ∗ excitonic peaks at spatially different locations refers to the polarization and or thickness... (More)

Despite the common challenge of investigating non-metallic inclusions within ultra-high-strength-steel (UHSS) at sub-micrometer scale via conventional methods, probing nitride inclusions at elevated temperatures is vital for guiding steel’ performance. Herein, an in-situ spectro-microscopic determination using advanced Synchrotron X-ray absorption spectroscopy (XAS) coupled with photoelectron emission microscopy (PEEM) is employed to explore the local structure and electronic properties of selective h-boron nitride (h-BN) containing inclusions (A1 and A2) embedded within steel matrix. While the variation in the relative intensity of π∗/σ∗ excitonic peaks at spatially different locations refers to the polarization and or thickness effects. Several minute features observed in the 192–195 eV energy range show oxygen (O) substituted nitrogen (N) defects (ON,2N,3N), which are more dominant in A2 inclusion. The observed dominance further explains the relatively high intense π∗ peak in A2 due to increased localization. Weak shoulder on the left side of π∗ peak in both room and high-temperature XAS spectra is ascribed to the interaction between h-BN and the local environment, such as Ca-based inclusion or steel matrix. Defects are commonly found in h-BN, and precise identification of the same is vital as they affect the overall physical, chemical, and mechanical properties. Moreover, significant changes in high-temperature B K-edge XAS spectra, such as relative intensity of π∗/σ∗ excitonic peaks at the same location and reduced intensity of defects, suggest the adjusting nature of BN inclusion, complicating their precise prediction and control towards clean steel production.

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publishing date
type
Contribution to journal
publication status
published
subject
keywords
In-situ, Low carbon steel, Non-metallic inclusion, X-ray absorption spectroscopy, X-ray synchrotron radiation
in
Journal of Materials Research and Technology
volume
17
pages
10 pages
publisher
Elsevier
external identifiers
  • scopus:85125615382
ISSN
2238-7854
DOI
10.1016/j.jmrt.2022.01.170
language
English
LU publication?
yes
id
c0121f10-bc8e-4542-8364-0a2a17999653
date added to LUP
2022-06-14 11:38:42
date last changed
2022-06-14 11:38:42
@article{c0121f10-bc8e-4542-8364-0a2a17999653,
  abstract     = {{<p>Despite the common challenge of investigating non-metallic inclusions within ultra-high-strength-steel (UHSS) at sub-micrometer scale via conventional methods, probing nitride inclusions at elevated temperatures is vital for guiding steel’ performance. Herein, an in-situ spectro-microscopic determination using advanced Synchrotron X-ray absorption spectroscopy (XAS) coupled with photoelectron emission microscopy (PEEM) is employed to explore the local structure and electronic properties of selective h-boron nitride (h-BN) containing inclusions (A1 and A2) embedded within steel matrix. While the variation in the relative intensity of π∗/σ∗ excitonic peaks at spatially different locations refers to the polarization and or thickness effects. Several minute features observed in the 192–195 eV energy range show oxygen (O) substituted nitrogen (N) defects (O<sub>N,2N,3N</sub>), which are more dominant in A2 inclusion. The observed dominance further explains the relatively high intense π∗ peak in A2 due to increased localization. Weak shoulder on the left side of π∗ peak in both room and high-temperature XAS spectra is ascribed to the interaction between h-BN and the local environment, such as Ca-based inclusion or steel matrix. Defects are commonly found in h-BN, and precise identification of the same is vital as they affect the overall physical, chemical, and mechanical properties. Moreover, significant changes in high-temperature B K-edge XAS spectra, such as relative intensity of π∗/σ∗ excitonic peaks at the same location and reduced intensity of defects, suggest the adjusting nature of BN inclusion, complicating their precise prediction and control towards clean steel production.</p>}},
  author       = {{Rani, Ekta and Singh, Harishchandra and Alatarvas, Tuomas and Kharbach, Mourad and Cao, Wei and Sarpi, Brice and Zhu, Lin and Niu, Yuran and Zakharov, Alexei and Fabritius, Timo and Huttula, Marko}},
  issn         = {{2238-7854}},
  keywords     = {{In-situ; Low carbon steel; Non-metallic inclusion; X-ray absorption spectroscopy; X-ray synchrotron radiation}},
  language     = {{eng}},
  month        = {{03}},
  pages        = {{2333--2342}},
  publisher    = {{Elsevier}},
  series       = {{Journal of Materials Research and Technology}},
  title        = {{Uncovering temperature-tempted coordination of inclusions within ultra-high-strength-steel via in-situ spectro-microscopy}},
  url          = {{http://dx.doi.org/10.1016/j.jmrt.2022.01.170}},
  doi          = {{10.1016/j.jmrt.2022.01.170}},
  volume       = {{17}},
  year         = {{2022}},
}