Effect of heat input on the microstructure and mechanical properties of Ti–6Al–4V alloy repaired by wire-feed electron beam additive manufacturing

• DOI: 10.1016/j.jmrt.2023.06.214
• Publication Date: 2023-06-25T08:30:29Z
• Authors: Xuewei Tao; Ke Han; Shaolong Zhang; Yihao Zhu; Baosen Zhang; Zhengjun Yao; Haixia Liu
• Keywords: Elongation; Acicular; Titanium alloy

In this paper, wire-feed electron beam additive manufacturing (WFEBAM) was utilized to repair the damaged Ti6Al4V (abbreviated as Ti64) alloy with B and Y modified Ti64 wire, effect of heat input on repaired microstructure properties investigated. The results indicated that sizes prior columnar β grains α laths increased gradually input. Besides fine acicular laths, continuous αGB, retained phase, bits needle-like TiB Y2O3 nanoparticles were formed in deposited zone (DZ) due addition elements wire. addition, reduced microhardness wear resistance DZ, while still being superior mechanical substrate. It is attributed refinement precipitates. Compared substrate, DZ as-repaired sample 1# lowest (288J/mm) showed maximum (386HV), 18% higher than While also obtained friction coefficient (0.49), about 80.3% tensile strength elongation 840.6 MPa 14%, respectively, both which remained above 88% Therefore, could meet requirements.