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

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 (...

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Bibliographic Details
Published in:Coatings (Basel) 2020, Vol.10 (12), p.1250
Main Authors: Manova, Darina, Schlenz, Patrick, Gerlach, Jürgen W., Mändl, Stephan
Format: Article
Language:English
Subjects:
Austenite
Austenitic stainless steels
Correlation analysis
Geometry
Glow discharges
Intermetallic compounds
Ion beam sputtering
Ion beams
Ion implantation
Nitrogen
Optical emission spectroscopy
Plasma etching
Secondary ion mass spectrometry
Solid solutions
Stainless steel
Strain analysis
Wear resistance
X-ray diffraction
X-rays
Yield stress
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Summary: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.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings10121250