Influence of Microalloying Elements and Deformation Parameters on the Recrystallization and Precipitation Behavior of Two Low-Alloyed Steels
Publikationen: Beitrag in Fachzeitschrift › Artikel › Forschung › (peer-reviewed)
Autoren
Externe Organisationseinheiten
- Erich-Schmid-Institut für Materialwissenschaft der Österreichischen Akademie der Wissenschaften
- voestalpine Forschungsservicegesellschaft Donawitz GmbH
- voestalpine Stahl Donawitz GmbH
- voestalpine Wire Rod Austria GmbH, St. Peter Freienstein/Leoben
Abstract
The alloy design of modern high-strength low-alloy (HSLA) steels aims for a well-balanced combination of high toughness and strength. Using niobium and titanium as microalloying elements together with thermomechanical processing is a common way to obtain a fine-grained microstructure and therefore enhance the strength and toughness of HSLA steels. Herein, a low-alloyed steel and a microalloyed HSLA steel are investigated in the as-rolled condition and by double-hit experiments using various deformation parameters. Atom probe tomography, scanning transmission electron microscopy inside a scanning electron microscope, transmission kikuchi diffraction, and energy-dispersive X-ray spectroscopy are used to investigate the precipitates in the as-rolled condition and after deformation. It is shown that Nb-enriched TiN precipitates with an average size of around 15 nm are responsible for grain refinement in the as-rolled condition. The annealing temperature prior to the rolling process is set below the solution temperature of Nb(C,N). Enhancing the annealing temperature in the double-hit deformation tests above the solution temperature of Nb(C,N) leads to the precipitation of fine NbC precipitates with a size of around 5 nm. These precipitates are responsible for inhibited static recrystallization behavior.
Details
Originalsprache | Englisch |
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Aufsatznummer | 2100065 |
Seitenumfang | 9 |
Fachzeitschrift | Steel research international |
Jahrgang | 92.2021 |
Ausgabenummer | 9 |
Frühes Online-Datum | 24 März 2021 |
DOIs | |
Status | Veröffentlicht - Sept. 2021 |