Locally Adapted Microstructures in an Additively Manufactured Titanium Aluminide Alloy Through Process Parameter Variation and Heat Treatment

Electron beam powder bed fusion (PBF-EB/M) has been attracting great research interest as a promising technology for additive manufacturing of titanium aluminide alloys. However, challenges often arise from the process-induced evaporation aluminum, which is linked to PBF-EB/M process parameters. This study applied different volumetric energy densities during processing deliberately adjust aluminum contents in additively manufactured Ti-43.5Al-4Nb-1Mo-0.1B (TNM-B1) samples. The specimens were subsequently subjected hot isostatic pressing (HIP) and two-step heat treatment. influence parameter variation treatments on microstructure defect distribution investigated using optical scanning electron microscopy (SEM), well X-ray computed tomography (CT). Depending content, shifts phase transition temperatures could be identified via differential calorimetry (DSC). It was confirmed that after treatment strongly parameters associated evaporation. feasibility producing locally adapted microstructures within one component through subsequent demonstrated. Thus, fully lamellar (FL) nearly (NLγ) two adjacent areas adjusted, respectively. article protected by copyright. All rights reserved.