Metallurgical and mechanical characterization of electron beam welded super-duplex stainless steel UNS 32750

• For the first time, the detailed pilot studies on the weldability, metallurgical and mechanical characterization on EB welded super-duplex stainless steel plates.
• Contemplative explanations on the metallurgical and mechanical properties of the weldments.
• Balanced austenite–ferrite ratio, superior tensile properties at room temperature.

This paper addresses the weldability of 6 mm thick plates of super-duplex stainless steel by electron beam welding (EBW) process. Microstructure investigations conducted using optical and SE microscopy showed the presence of large ferrite grains with intra- and inter-granular austenite. Ferrite content studies on the weld zone estimated that there is no significant element partitioning between austenite and ferrite phases. Hardness studies portrayed that the weld hardness is found to be greater than the parent metal which is acquainted due to the solid solution strengthening effect. Tensile results corroborated that the joints obtained by EB welding process have better strength than the base metal. A detailed structure–property relationships has also been carried out through point and line mapping EDAX analysis across the weldment to substantiate the discussions.