Název: Microstructure modifications of Al-Si-coated press-hardened steel 22MnB5 by laser welding
Autoři: Šebestová, Hana ; Horník, Petr ; Mika, Filip ; Mikmeková, Šárka ; Ambrož, Ondřej ; Mrňa, Libor
Typ dokumentu: Příspěvky z konference
Konference/Akce: METAL 2023. International Conference on Metallurgy and Materials /32./, Brno (CZ), 20230517
Rok: 2024
Jazyk: eng
Abstrakt: Weld microstructure depends on the characteristics of welded materials and parameters of welding technology, especially on the heat input that determines the peak temperature and the cooling rate. When the coated sheets are welded, the effect of the chemical composition of the coating must be also considered even though its thickness is only a few tens of microns. During 22MnB5+AlSi laser welding experiments, the ferrite-stabilizing elements of coating modified the weld metal microstructure. Ferrite appeared in a quenched weld metal. The rapid cooling rate accompanying welding with a focused beam limited the homogenization of the weld metal which resulted in the formation of ferritic bands in the regions rich in Si and especially in Al. On the other hand, a high level of homogenization was reached when welding with the defocused beam. The ferritic islands uniformly distributed in the weld metal were formed at 0.4 wt% and 1.6 wt% of Si and Al, respectively. The doubled heat input reduced the Al content to 0.7 wt% insufficient for the ferrite formation at still relatively high cooling rates. Predicting the distribution of ferrite in the weld metal is challenging due to its dependence on various factors, such as cooling rate and the volume of dissolved coating, which may vary with any modifications made to the welding parameters.
Klíčová slova: ferrite stabilization; heat input; high-strength steel; laser welding; microstructure
Číslo projektu: FW01010293, StrategieAV21/17
Poskytovatel projektu: GA TA ČR, AV ČR
Zdrojový dokument: METAL 2023. 32nd International Conference on Metallurgy and Materials. Conference Proceedings, ISBN 978-80-88365-12-9, ISSN 2694-9296
Poznámka: Související webová stránka: https://www.confer.cz/metal/2023/4646-microstructure-modifications-of-al-si-coated-press-hardened-steel-22mnb5-by-laser-welding

Instituce: Ústav přístrojové techniky AV ČR (web)
Informace o dostupnosti dokumentu: Dokument je dostupný v příslušném ústavu Akademie věd ČR.
Původní záznam: https://hdl.handle.net/11104/0351050

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-541151


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Věda a výzkum > AV ČR > Ústav přístrojové techniky
Konferenční materiály > Příspěvky z konference