|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Establishing Location-Specific Processing-Microstructure-Property Relationships
||The Origin and Effect of HAZ Banding in Large Scale Wire-Arc Additive Manufacture with Ti-6Al-4V
||Alistair Ho, Jack Donoghue, Thays Machry, Jialuo Ding, Filomeno Martina, Stewart Williams, Phil Prangnell
|On-Site Speaker (Planned)
Wire arc-based additive manufacture (WAAM) is a high deposition rate process suitable for building large-scale aerospace components. However, the large heat source and relatively thick layer height can cause significant microstructural heterogeneity. In particular, overlap of the thermal field from sequential passes leads to the formation white etched bands in optical images of the transformation microstructure. The origin of these bands and their consequences for mechanical performance are still not fully understood. In the work presented the local microstructure, texture, phase chemistry and strain distribution across added layers has been studied in the steady state region of a WAAM deposit, using quantitative microstructure data and image correlation. It is shown that the white bands primarily result from variation in composition of the α and β phases, and strain localisation can occur due to the appearance of a local microstructure comprised of larger domains with a single α variant.
||Planned: Supplemental Proceedings volume