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Colloidal Analysis of Particles Extracted from Microalloyed Steels

  • Different colloidal particle characterization methods are examined for their suitability to determine the particle size distribution of particles extracted from steels. Microalloyed steels are dissolved to extract niobium and titanium carbonitride particles that are important for the mechanical properties of these steels. Such particles have sizes ranging from several nanometers to hundreds of nanometers depending on the precipitation stage during the thermomechanically controlled rolling process. The size distribution of the particles is analyzed by dynamic light scattering (DLS), analytical ultracentrifugation (AUC), and hollow fiber flow field-flow fractionation (HF5) and compared to data obtained for reference particles as well as data from electron microscopy, the standard sizing technique used in metallurgy today. AUC and HF5 provide high-quality size distributions, average over large particle numbers that enables statistical analysis, and yield useful insights for alloy design; however, DLS fails due to a lack of resolution. Important aspects in the conversion and comparison of size distributions obtained for broadly distributed particle systems with different measurement principles and the role of surfactants used in sample preparation are discussed.

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Document Type:Article
Author:Andreas HegetschweilerORCiD, Aljosha-Rakim Jochem, Anna Zimmermann, Johannes Walter, Thorsten Staudt, Tobias KrausORCiD
Parent Title (English):Particle & Particle Systems Characterization
First Page:2000236
Year of first Publication:2021
Release Date:2022/08/25
Tag:Colloidal analysis; Microalloyed steels; Niobium carbonitrides; Precipitate analysis; Titanium carbonitrides
Impact:03.467 (2021)
Funding Information:AG der Dillinger Hüttenwerke
Research Departments:Strukturbildung
DDC classes:500 Naturwissenschaften und Mathematik / 540 Chemie
Open Access:Open Access
Signature:INM 2021/069
Licence (German):License LogoCreative Commons - CC BY-NC - Namensnennung - Nicht kommerziell 4.0 International