Additive Manufacturing of γ‐TiAl: Processing, Microstructure, and Properties

Additive manufacturing of γ-TiAl intermetallic alloy using laser-engineered net shaping (LENS) is reported. The influence of laser power and scan speed on processability, microstructure, tribological, and electrochemical properties is studied. The results demonstrate that near net shape γ-TiAl parts can be fabricated using LENS and defect-free parts are obtained with narrow laser energy input range (40–50 J mm−2). The high cooling rates result in massive-like γ matrix with small amount of γ + α2 lamellar. Process parameters strongly influence tribological and electrochemical properties of LENS-processed γ-TiAl parts in 3.5% NaCl solution. Wear is of abrasive type with no evidence of corrosion on wear tracks.