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Volume 10
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10.3390/coatings10121250
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Article

Depth-Resolved Phase Analysis of Expanded Austenite Formed in Austenitic Stainless Steel

by
Darina Manova
,
Patrick Schlenz
,
Jürgen W. Gerlach
and
Stephan Mändl
*
Leibniz Institute of Surface Engineering (IOM), D-04318 Leipzig, Germany
*
Author to whom correspondence should be addressed.
Coatings 2020, 10(12), 1250; https://doi.org/10.3390/coatings10121250
Submission received: 30 November 2020 / Revised: 15 December 2020 / Accepted: 16 December 2020 / Published: 18 December 2020
(This article belongs to the Special Issue Design, Characterization and Applications of Functional Coatings)
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Abstract

Expanded austenite γN formed after nitrogen insertion into austenitic stainless steel and CoCr alloys is known as a hard and very wear resistant phase. Nevertheless, no single composition and lattice expansion can describe this phase with nitrogen in solid solution. Using in situ X-ray diffraction (XRD) during ion beam sputtering of expanded austenite allows a detailed depth-dependent phase analysis, correlated with the nitrogen depth profiles obtained by time-of-flight secondary ion mass spectrometry (ToF-SIMS) or glow discharge optical emission spectroscopy (GDOES). Additionally, in-plane XRD measurements at selected depths were performed for strain analysis. Surprisingly, an anomalous peak splitting for the (200) expanded peak was observed for some samples during nitriding and sputter etching, indicating a layered structure only for {200} oriented grains. The strain analysis as a function of depth and orientation of scattering vector (parallel/perpendicular to the surface) is inconclusive.
Keywords: in situ XRD; expanded austenite; ion implantation in situ XRD; expanded austenite; ion implantation

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MDPI and ACS Style

Manova, D.; Schlenz, P.; Gerlach, J.W.; Mändl, S. Depth-Resolved Phase Analysis of Expanded Austenite Formed in Austenitic Stainless Steel. Coatings 2020, 10, 1250. https://doi.org/10.3390/coatings10121250

AMA Style

Manova D, Schlenz P, Gerlach JW, Mändl S. Depth-Resolved Phase Analysis of Expanded Austenite Formed in Austenitic Stainless Steel. Coatings. 2020; 10(12):1250. https://doi.org/10.3390/coatings10121250

Chicago/Turabian Style

Manova, Darina, Patrick Schlenz, Jürgen W. Gerlach, and Stephan Mändl. 2020. "Depth-Resolved Phase Analysis of Expanded Austenite Formed in Austenitic Stainless Steel" Coatings 10, no. 12: 1250. https://doi.org/10.3390/coatings10121250

APA Style

Manova, D., Schlenz, P., Gerlach, J. W., & Mändl, S. (2020). Depth-Resolved Phase Analysis of Expanded Austenite Formed in Austenitic Stainless Steel. Coatings, 10(12), 1250. https://doi.org/10.3390/coatings10121250

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