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Microstructures of high strength steel welding consumables from directed thermal cycles by shaped laser pulses
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Produkt- och produktionsutveckling. (Manufacturing Systems and Engineering)ORCID-id: 0000-0002-8298-292X
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Produkt- och produktionsutveckling. (Manufacturing systems engineering)
Lincoln electric europe.
Lincoln electric europe.
Vise andre og tillknytning
(engelsk)Inngår i: Journal of Materials Processing Technology, ISSN 0924-0136, E-ISSN 1873-4774Artikkel i tidsskrift (Fagfellevurdert) Submitted
Abstract [en]

Filler wire metallurgy was modified through temporally shaped laser pulses, controlling cooling cycles in a recently developed method. Trends were identified through efficient mapping while maintaining representative thermal cycles of welding processes. A primary pulse melted preplaced filler wires in a cavity, forming a nugget. A secondary ramp-down pulse elevated the nugget temperatures to re-austenisation followed by linear temperature decay, guiding the temperature through a regime to a desired microstructure. For three very high strength steel wire chemistries, quenching yielded smaller plates with cross-hatched microstructures, accompanied by grain boundary ferrite. Finer bainite microstructures started forming for fast linear temperature decay, about 250°C/s. Slower decay or a weaker third cycle led to less cross-hatching, coarser microstructure and coalescent sheaves.

Emneord [en]
filler wire, consumable, welding, thermal cycle, microstructure, cooling rate
HSV kategori
Forskningsprogram
Produktionsutveckling
Identifikatorer
URN: urn:nbn:se:ltu:diva-76032OAI: oai:DiVA.org:ltu-76032DiVA, id: diva2:1353846
Prosjekter
OptoSteelNorFaST-HT
Forskningsfinansiär
Interreg Nord, 304-15588-2015Tilgjengelig fra: 2019-09-24 Laget: 2019-09-24 Sist oppdatert: 2019-09-24

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