Titanium Aluminides (TiAl) are promising materials for lightweight high temperature applications. The conventional production of high-performance TiAl components comprises casting, hot isostatic pressing, isothermal forging, and machining. TiAl can be forged only in a narrow processing window at elevated temperatures. Forging of TiAl components is usually carried out in several stages requiring more than one die-set and long processing time. Powder-based additive manufacturing (AM) processes enable near-net-shape production of components from various materials, including TiAl. However, the AM parts cannot reach the mechanical properties of forgings. Combining AM and isothermal forging could help to reduce the investments in expensive tooling and improve the material yield. In the present study, the hot forming behavior of TNM-B1 alloy, produced by powder-bed AM, is investigated with respect to workability and microstructure evolution.