Degree Name

Doctor of Philosophy


School of Mechanical, Materials, Mechatronic and Biomedical Engineering


The wire arc additive manufacturing (WAAM) is one of the advanced manufacturing processes to fabricate full-density three-dimensional (3D) Inconel 718 (IN718) metal parts in an open freeform environment. Thus, there is no size restrictions of the fabricated parts using this process which is suitable for industry-led medium to large production supply chain. So far, the use of WAAM process in the fabrication of IN718 parts is solely focused on the effects of standard heat-treatments on the evolution of microstructural constituents and mechanical properties. Therefore, the present study is attempted to systemically investigate the effects of welding parameters, heat-treatment, high-oxidation temperatures and hot-deformation characteristics on the processing-microstructure-property relationship of IN718 alloys manufactured via Gas Tungsten Arc Welding (GTAW)-based WAAM process. A wrought IN718 alloy was also studied for comparison.

FoR codes (2008)

0910 MANUFACTURING ENGINEERING, 091006 Manufacturing Processes and Technologies (excl. Textiles), 0912 MATERIALS ENGINEERING, 091207 Metals and Alloy Materials



Unless otherwise indicated, the views expressed in this thesis are those of the author and do not necessarily represent the views of the University of Wollongong.