Detail publikačního výsledku

Microstructural Characterization of Laser Weld of Hot-Stamped Al-Si Coated 22MnB5 and Modification of Weld Properties by Hybrid Welding

ŠEBESTOVÁ, H.; HORNÍK, P.; MIKMEKOVÁ, Š.; MRŇA, L.; DOLEŽAL, P.; NOVOTNÝ, J.

Originální název

Microstructural Characterization of Laser Weld of Hot-Stamped Al-Si Coated 22MnB5 and Modification of Weld Properties by Hybrid Welding

Anglický název

Microstructural Characterization of Laser Weld of Hot-Stamped Al-Si Coated 22MnB5 and Modification of Weld Properties by Hybrid Welding

Druh

Článek WoS

Originální abstrakt

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.

Anglický abstrakt

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.

Klíčová slova

22MnB5; laser welding; hybrid welding; cooling rate; tensile strength; microstructure; microhardness

Klíčová slova v angličtině

22MnB5; laser welding; hybrid welding; cooling rate; tensile strength; microstructure; microhardness

Autoři

ŠEBESTOVÁ, H.; HORNÍK, P.; MIKMEKOVÁ, Š.; MRŇA, L.; DOLEŽAL, P.; NOVOTNÝ, J.

Rok RIV

2022

Vydáno

14.07.2021

Nakladatel

MDPI

Místo

BASEL

ISSN

1996-1944

Periodikum

Materials

Svazek

14

Číslo

14

Stát

Švýcarská konfederace

Strany od

1

Strany do

15

Strany počet

15

URL

https://doi.org/10.3390/ma14143943

Plný text v Digitální knihovně

http://hdl.handle.net/11012/204054

BibTex

@article{BUT177302,
  author="Hana {Šebestová} and Petr {Horník} and Šárka {Mikmeková} and Libor {Mrňa} and Pavel {Doležal} and Jan {Novotný}",
  title="Microstructural Characterization of Laser Weld of Hot-Stamped Al-Si Coated 22MnB5 and Modification of Weld Properties by Hybrid Welding",
  journal="Materials",
  year="2021",
  volume="14",
  number="14",
  pages="1--15",
  doi="10.3390/ma14143943",
  issn="1996-1944",
  url="https://doi.org/10.3390/ma14143943"
}

Dokumenty

materials-14-03943-v2