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Microstructures of high strength steel welding consumables from directed thermal cycles by shaped laser pulses
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development. (Manufacturing Systems and Engineering)ORCID iD: 0000-0002-8298-292X
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development. (Manufacturing systems engineering)
Lincoln electric europe.
Lincoln electric europe.
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(English)In: Journal of Materials Processing Technology, ISSN 0924-0136, E-ISSN 1873-4774Article in journal (Refereed) 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.

Keywords [en]
filler wire, consumable, welding, thermal cycle, microstructure, cooling rate
National Category
Mechanical Engineering Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-76032OAI: oai:DiVA.org:ltu-76032DiVA, id: diva2:1353846
Projects
OptoSteelNorFaST-HT
Funder
Interreg Nord, 304-15588-2015Available from: 2019-09-24 Created: 2019-09-24 Last updated: 2019-09-24

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