  Wire + arc additive manufacture (WAAM) is an attractive method for
manufacturing large-scale aerospace components, however the microstructural
changes that occur and the effect of interpass rolling are poorly understood.
Therefore two fundamental studies were conducted: the first involved
temperature measurement of a wrought dummy wall so that the microstructural
changes in the heat affected zone (HAZ) could be related to the thermal cycle.
This demonstrated that the white band in the microstructure corresponded to 825
C well below the beta-transus temperature and above this boundary the bi-modal
substrate material was converted to lamellar. The second involved peening WAAM
material along the side of a deposited wall before applying a typical WAAM
thermal heat treatment. This showed that refinement occurred up to the first
layer band in the microstructure and the smallest grains were observed just
above this boundary at higher temperatures significant grain growth occurred.
This study has provided the foundational understanding of microstructural
changes that will facilitate future process developments.
