Corrosion Behaviour of Wire Arc Additive Manufactured AA2024 Alloy Thin Wall Structure: The Influence of Interpass Rolling

Abstract

The present work investigates the corrosion behaviour of an AA2024 alloy thin wall structure produced by wire arc additive manufacturing (WAAM) with interpass rolling, focussing on the influence of interpass rolling. It is found that although interpass rolling does not change the typical configuration of thin wall structure, i.e. melt pool zone (MPZ), melt pool border (MPB) and heat-affected zone (HAZ), the plastic deformation introduced by interpass rolling leads to the variation of grain-stored energy across the structure, which consequently results in the highest corrosion susceptibility of MPB due to its relatively high stored energy.