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Erschienen in: Journal of Materials Engineering and Performance 10/2012

01.10.2012

Development of Weld Metal Microstructures in Pulsed Laser Welding of Duplex Stainless Steel

verfasst von: F. Mirakhorli, F. Malek Ghaini, M. J. Torkamany

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 10/2012

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Abstract

The microstructure of the weld metal of a duplex stainless steel made with Nd:YAG pulsed laser is investigated at different travel speeds and pulse frequencies. In terms of the solidification pattern, the weld microstructure is shown to be composed of two distinct zones. The presence of two competing heat transfer channels to the relatively cooler base metal and the relatively hotter previous weld spot is proposed to develop two zones. At high overlapping factors, an array of continuous axial grains at the weld centerline is formed. At low overlapping factors, in the zone of higher cooling rate, a higher percentage of ferrite is transformed to austenite. This is shown to be because with extreme cooling rates involved in pulsed laser welding with low overlapping, the ferrite-to-austenite transformation can be limited only to the grain boundaries.

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Metadaten
Titel
Development of Weld Metal Microstructures in Pulsed Laser Welding of Duplex Stainless Steel
verfasst von
F. Mirakhorli
F. Malek Ghaini
M. J. Torkamany
Publikationsdatum
01.10.2012
Verlag
Springer US
Erschienen in
Journal of Materials Engineering and Performance / Ausgabe 10/2012
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-012-0141-3

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