Influence of Two?Step Heat Treatments on Microstructure and Mechanical Properties of a ??Solidifying Titanium Aluminide Alloy Fabricated via Electron Beam Powder Bed Fusion

Additive manufacturing technologies, particularly electron beam powder bed fusion (PBF-EB/M), are becoming increasingly important for the processing of intermetallic titanium aluminides. This study presents effects hot isostatic pressing (HIP) and subsequent two-step heat treatments on microstructure mechanical properties TNM-B1 alloy (Ti–43.5Al–4Nb–1Mo–0.1B) fabricated via PBF-EB/M. Adequate solution treatment temperatures allow adjustment fully lamellar (FL) nearly (NL-?) microstructures. The specimens characterized by optical microscopy scanning (SEM), X-ray computed tomography (CT), diffraction (XRD), backscatter (EBSD). at ambient evaluated tensile testing fractography. While lack-of-fusion defects main causes failure in as-built condition, heat-treated conditions predominantly controlled microstructure. highest ultimate strength is achieved after HIP due to elimination defects. results reveal challenges originating from PBF-EB/M process, example, local variations chemical composition aluminum evaporation, which turn affect microstructures treatment. For designing suitable strategies, particular attention should therefore be paid microstructural characteristics associated with additive manufacturing.