Microstructural characterization of laser weld of hot-stamped Al-Si coated 22MnB5 and modification of weld properties by hybrid welding

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F21%3A00544220" target="_blank" >RIV/68081731:_____/21:00544220 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216305:26310/21:PU144085

Výsledek na webu

<a href="https://www.mdpi.com/1996-1944/14/14/3943" target="_blank" >https://www.mdpi.com/1996-1944/14/14/3943</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/ma14143943" target="_blank" >10.3390/ma14143943</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Microstructural characterization of laser weld of hot-stamped Al-Si coated 22MnB5 and modification of weld properties by hybrid welding

Popis výsledku v původním jazyce

The presence of Al-Si coating on 22MnB5 leads to the formation of large ferritic bands in the dominantly martensitic microstructure of butt laser welds. Rapid cooling of laser weld metal is responsible for insufficient diffusion of coating elements into the steel and incomplete homogenization of weld fusion zone. The Al-rich regions promote the formation of ferritic solid solution. Soft ferritic bands cause weld joint weakening. Laser welds reached only 64% of base metal's ultimate tensile strength, and they always fractured in the fusion zone during the tensile tests. We implemented hybrid laser-TIG welding technology to reduce weld cooling rate by the addition of heat of the arc. The effect of arc current on weld microstructure and mechanical properties was investigated. Thanks to the slower cooling, the large ferritic bands were eliminated. The hybrid welds reached greater ultimate tensile strength compared to laser welds. The location of the fracture moved from the fusion zone to a tempered heat-affected zone characterized by a drop in microhardness. The minimum of microhardness was independent of heat input in this region.

Název v anglickém jazyce

Microstructural characterization of laser weld of hot-stamped Al-Si coated 22MnB5 and modification of weld properties by hybrid welding

Popis výsledku anglicky

The presence of Al-Si coating on 22MnB5 leads to the formation of large ferritic bands in the dominantly martensitic microstructure of butt laser welds. Rapid cooling of laser weld metal is responsible for insufficient diffusion of coating elements into the steel and incomplete homogenization of weld fusion zone. The Al-rich regions promote the formation of ferritic solid solution. Soft ferritic bands cause weld joint weakening. Laser welds reached only 64% of base metal's ultimate tensile strength, and they always fractured in the fusion zone during the tensile tests. We implemented hybrid laser-TIG welding technology to reduce weld cooling rate by the addition of heat of the arc. The effect of arc current on weld microstructure and mechanical properties was investigated. Thanks to the slower cooling, the large ferritic bands were eliminated. The hybrid welds reached greater ultimate tensile strength compared to laser welds. The location of the fracture moved from the fusion zone to a tempered heat-affected zone characterized by a drop in microhardness. The minimum of microhardness was independent of heat input in this region.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20301 - Mechanical engineering

Projekt

<a href="/cs/project/TH04010366" target="_blank" >TH04010366: Pokročilé metody laserové svařování pro automobilový průmysl</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Materials

ISSN

1996-1944

e-ISSN

1996-1944

Svazek periodika

14

Číslo periodika v rámci svazku

14

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

15

Strana od-do

3943

Kód UT WoS článku

000676610300001

EID výsledku v databázi Scopus

2-s2.0-85111455543