The influence of radial shear rolling on the structure and properties of 58Ni-Cr-Mo-B-Al-Cu superalloy

The work is devoted to a study of the microstructure and microhardness heat-resistant nickel-based superalloy 58Ni-Cr-Mo-B-Al-Cu after radial-shear rolling. rolling was carried out at temperature 925°С in three stages. It found that grain size γ-phase all stages decreased radial direction from center periphery 62 ± 2 2.5 0.2 µm. At third stage, grains reduced twice billet comparison initial state. same time, individual with 100 μm surface are observed, 1±0.1 present periphery. changes inverse proportion size, values increase radius direction. maximum value achieved peripheral part sample equal 5.4 0.6 GPa. According EBSD analysis, there no texture periphery, but middle two-component axial <001> + <111> type along axis. characterized by presence more pronounced obtained results indicate possibility gradient structure formation coarse-grained structure.