Microstructure modifications of Al-Si-coated press-hardened steel 22MnB5 by laser welding

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F24%3A00583056" target="_blank" >RIV/68081731:_____/24:00583056 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.confer.cz/metal/2023/4646-microstructure-modifications-of-al-si-coated-press-hardened-steel-22mnb5-by-laser-welding" target="_blank" >https://www.confer.cz/metal/2023/4646-microstructure-modifications-of-al-si-coated-press-hardened-steel-22mnb5-by-laser-welding</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.37904/metal.2023.4646" target="_blank" >10.37904/metal.2023.4646</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Microstructure modifications of Al-Si-coated press-hardened steel 22MnB5 by laser welding

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Microstructure modifications of Al-Si-coated press-hardened steel 22MnB5 by laser welding

Popis výsledku anglicky

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.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20301 - Mechanical engineering

Projekt

<a href="/cs/project/FW01010293" target="_blank" >FW01010293: Využití laserových a hybridních technologií v energetických zařízeních</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

METAL 2023. 32nd International Conference on Metallurgy and Materials. Conference Proceedings

ISBN

978-80-88365-12-9

ISSN

2694-9296

e-ISSN

—

Počet stran výsledku

6

Strana od-do

302-307

Název nakladatele

TANGER

Místo vydání

Ostrava

Místo konání akce

Brno

Datum konání akce

17. 5. 2023

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

001242776200043