In this study, the microstructural evolution during uniaxial compressive deformation at temperatures of 950°C, 1000°C, and 1050°C was investigated using in situ X-ray diffraction to mimic the forging process. Figure 1 shows the evolution of the microstructure from the initial state before deformation to the final state after deformation and cooling. The hot forming leads to subgrain formation, dynamic recrystallization (DRX), and the built up of a texture by rotation of grains into preferred orientations. The root-mean-square roughness (Rq) values are used as an additional measure to follow both the grain size and texture evolution with increasing deformation. Directly after the hot forming, the effect of different cooling rates on the resulting microstructure was investigated. The diffraction data are substantiated by supplementary microscopic examinations.