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Updated: May 7, 2026
11:10
Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
Published on: May 23, 2018
Atom probe study of vanadium interphase precipitates and randomly distributed vanadium precipitates in ferrite
M Nöhrer1, S Zamberger, S Primig
1Christian Doppler Laboratory for Early Stages of Precipitation, Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Franz-Josef-Straße 18, A-8700 Leoben, Austria.
Micron (Oxford, England : 1993)
|September 18, 2013
Summary
Vanadium micro-alloyed steel exhibits two distinct precipitate types in ferrite: randomly distributed V-C-N and interphase V-C-Mn precipitates. Their differing compositions and distributions stem from their formation sites within the steel matrix.
Area of Science:
- Materials Science
- Metallurgy
- Physical Chemistry
Background:
- Vanadium micro-alloyed steels are crucial in various industries due to their enhanced mechanical properties.
- Precipitation reactions significantly influence the microstructure and performance of these steels.
- Understanding precipitate characteristics is key to optimizing thermo-mechanical processing.
Purpose of the Study:
- To investigate and differentiate between precipitate types formed in ferrite and austenite phases.
- To analyze the chemical composition and distribution of precipitates.
- To elucidate the formation mechanisms and site-specific differences of precipitates.
Main Methods:
- Utilized atom probe tomography (APT) for high-resolution chemical analysis.
- Employed transmission electron microscopy (TEM) for microstructural examination.
- Analyzed samples subjected to a specific thermo-mechanical process.
Main Results:
- Two distinct precipitate types were identified exclusively within the ferrite phase.
- Randomly distributed precipitates comprised Vanadium (V), Carbon (C), and Nitrogen (N), with sizes up to 20 nm.
- Interphase precipitates contained V, C, and Manganese (Mn), with sizes up to 15 nm, and were located in carbon- and manganese-rich regions.
Conclusions:
- Precipitate characteristics are strongly dependent on their formation location within the steel matrix.
- The higher local concentrations of C, Mn, and V in interphase regions influence precipitate composition.
- The study provides insights into controlling precipitate formation for tailored steel properties.
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