Applicability study of pulsed laser beam welding on ferritic–martensitic ODS eurofer steel

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Abstract

Pulsed laser beam welding was used successfully to join the oxide dispersion-strengthened (ODS) Eurofer steel. The joining was conducted with a laser power of 2500 W and a pulsed duration of 4 ms. With the filler material being used, a minor material loss and microvoids were observed in the joint. The microstructure of the fusion zone consists of dual phase elongated structures. The heat-affected zone has a width of around 0.06 mm with finer grains. The transmission electron microscopy observation reveals that nanoprecipitates are finely distributed in the fusion zone. The tensile strength, yield strength and elongation of the joint are slightly inferior to the base material. The fractography results reveal a typical ductile fracture. The experimental results indicate a reasonable joint from the perspective of both the microstructure and mechanical behaviour.

Original languageEnglish
Article number736
Number of pages9
JournalMetals
Volume10
Issue number6
DOIs
Publication statusPublished - 2020

Keywords

  • Electron microscopy
  • Laser welding
  • Mechanical properties
  • Microstructure
  • Oxide dispersion strengthened (ODS) alloy

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