| Abstract Scope |
Titanium-zirconium-molybdenum (TZM) has extraordinary physicochemical properties, making it ideal for usage in extreme environmental applications. Wire + arc additive manufacturing has several advantages, including high deposition rate, energy efficiency, and cost-effective manufacturing of large components. In this study, we comprehensively investigate the relationships among process, microstructures, mechanical properties, and defects of WAAM TZM thin-walls with four heat input conditions: 180A, 200A, 220A, and 240A. Columnar grains were generated with strong texture along the build direction, and carbide precipitates were found uniformly distributed in the Mo matrix. Multi-scale pores and cracks were present in the microstructures. The average microhardness values for the deposits ranged from 188.5 to 193.5 hardness scales of Vickers. The highest yield strength, 195 MPa, was found in the 200A heat input condition. The primary fracture mode was identified as a brittle transgranular. The largest area fraction of porosity was calculated 2.04% in the 240A deposit. |