Fig. 1: Experimental setup and ex situ data.
From: Operando neutron diffraction reveals mechanisms for controlled strain evolution in 3D printing
A Wire-arc additive manufacturing was performed to produce mild-steel and low-temperature transformation (LTT250) steel samples. Samples were fabricated in three sections and cooled to room temperature between. B Ex situ neutron diffraction measurements (collected at HFIR) show elastic lattice strain variation with height along the centerline. C An operando additive manufacturing setup was constructed to monitor temperature, phase transformations, and lattice strain during processing at SNS. D Dilatometry data showing the approximate phase transformation temperatures for AM fabricated LTT steel. E A schematic of the operando experimental procedure which includes builds in three sections, with cooling to room temperature in between using active cooling, following which maps of lattice strain are performed.
