Microstructures of high-strength steel welding consumables from directed thermal cycles by shaped laser pulses

Stephanie M. Robertson1, Jan Frostevarg1, Anandkumar Ramasamy2, Bert Kalfsbeek2, Jörg Volpp1, Alexander F. H. Kaplan1
1Department of Engineering Sciences and Mathematics, Luleå University of Technology, Luleå, Sweden
2Lincoln Electric Europe, Nijmegen, Netherlands

Tóm tắt

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 while a secondary, linearly ramped-down pulse elevated the nugget to re-austenization temperatures. Ramped-down pulses resulted in linear cooling rates comparable with and exceeding furnace-based methods, between 50 and 300∘C/s. The linear decay of laser output power guided the temperature through a regime to obtain desired microstructures. For three very high-strength steel filler wire chemistries, quenching resulted in 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 formed coarser microstructures with coalescent sheaves and less cross-hatching.

Tài liệu tham khảo

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