Effect of weld cooling rate on Laves phase formation in Inconel 718 fusion zone.

Highlights: [•] Instantaneous cooling rate is maximum with the modified pulse mode and Helium shielding gas by steeper temperature gradient. [•] The maximum instantaneous cooling rate is effective in laves formation temperature range. [•] Reduction in laves phase has been demonstrated. [•] Segregation of Nb decreases with enhanced cooling rates and the phenomenon need to be further probed for Mo. [•] Reduction in laves phase and alloying element segregation has been confirmed with dendrite arm spacing. [ABSTRACT FROM AUTHOR]