Microstructural Aspects of Bifocal Laser Welding of Trip Steels

This work is concerned with comparative tests involving single-spot and twin-spot laser welding of thermomechanically rolled TRIP steel. The welding tests were carried out using keyhole welding and a solid state laser. In the case of twin-spot laser beam welding, the power distribution of beams was...

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Bibliographic Details
Published inArchives of metallurgy and materials Vol. 62; no. 2; pp. 611 - 618
Main Authors Grajcar, A., Grzegorczyk, B., Różański, M., Stano, S., Morawiec, M.
Format Journal Article
LanguageEnglish
Published Warsaw De Gruyter Open 01.06.2017
Polish Academy of Sciences
Subjects
AHSS
Alloys
dual beam
Electric power distribution
hardness profile
Heat affected zone
Laser beam welding
laser welding
Lasers
Martensite
Mechanical properties
Microstructure
retained austenite
Scanning electron microscopy
Solid state
TRIP steel
TRIP steels
Welded joints
Welding
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Summary:This work is concerned with comparative tests involving single-spot and twin-spot laser welding of thermomechanically rolled TRIP steel. The welding tests were carried out using keyhole welding and a solid state laser. In the case of twin-spot laser beam welding, the power distribution of beams was 50%:50%. The changes in macro- and microstructures were investigated using light and scanning electron microscopy. Three main zones subjected to the tests included the fusion zone, the heat affected zone and the intercritical heat affected zone (transition zone between the base material and the HAZ). Special attention was paid to the effect of various thermal cycles on the microstructure of each zone and on martensite morphology. The tests involved hardness measurements carried out in order to investigate the effect of different microstructures on mechanical properties of welds.
ISSN:2300-1909
1733-3490
2300-1909
DOI:10.1515/amm-2017-0090