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Original title:
Microstructure modifications of Al-Si-coated press-hardened steel 22MnB5 by laser welding
Authors: Šebestová, Hana ; Horník, Petr ; Mika, Filip ; Mikmeková, Šárka ; Ambrož, Ondřej ; Mrňa, Libor
Document type: Papers
Conference/Event: METAL 2023. International Conference on Metallurgy and Materials /32./, Brno (CZ), 20230517
Year: 2024
Language: eng
Abstract: 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.
Keywords: ferrite stabilization; heat input; high-strength steel; laser welding; microstructure
Project no.: FW01010293, StrategieAV21/17
Funding provider: GA TA ČR, AV ČR
Host item entry: METAL 2023. 32nd International Conference on Metallurgy and Materials. Conference Proceedings, ISBN 978-80-88365-12-9, ISSN 2694-9296
Note: Související webová stránka: https://www.confer.cz/metal/2023/4646-microstructure-modifications-of-al-si-coated-press-hardened-steel-22mnb5-by-laser-welding
Institution: Institute of Scientific Instruments AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: https://hdl.handle.net/11104/0351050
Permalink: http://www.nusl.cz/ntk/nusl-541151
The record appears in these collections:
Research > Institutes ASCR > Institute of Scientific Instruments
Conference materials > Papers
Authors: Šebestová, Hana ; Horník, Petr ; Mika, Filip ; Mikmeková, Šárka ; Ambrož, Ondřej ; Mrňa, Libor
Document type: Papers
Conference/Event: METAL 2023. International Conference on Metallurgy and Materials /32./, Brno (CZ), 20230517
Year: 2024
Language: eng
Abstract: 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.
Keywords: ferrite stabilization; heat input; high-strength steel; laser welding; microstructure
Project no.: FW01010293, StrategieAV21/17
Funding provider: GA TA ČR, AV ČR
Host item entry: METAL 2023. 32nd International Conference on Metallurgy and Materials. Conference Proceedings, ISBN 978-80-88365-12-9, ISSN 2694-9296
Note: Související webová stránka: https://www.confer.cz/metal/2023/4646-microstructure-modifications-of-al-si-coated-press-hardened-steel-22mnb5-by-laser-welding
Institution: Institute of Scientific Instruments AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: https://hdl.handle.net/11104/0351050
Permalink: http://www.nusl.cz/ntk/nusl-541151
The record appears in these collections:
Research > Institutes ASCR > Institute of Scientific Instruments
Conference materials > Papers
Record created 2024-02-25, last modified 2024-02-25