Effect of Diamond Rotary Rolling Treatment on Surface Property and Fatigue Life of GH2787 Superalloy

Material fatigue is closely related to surface characteristics, which can be enhanced through advanced surface treatments. In this study, diamond rotary rolling treatment (DRRT), a novel method for improving the surface properties of the GH2787 superalloy, is presented with the aim of augmenting its fatigue resistance. A comprehensive evaluation of the DRRT's effects is conducted using X‐ray diffraction, digital Vickers hardness testing, 3D optical microscopy, and electron backscatter diffraction (EBSD). The DRRT introduces biaxial compressive residual stresses up to −1318 MPa, minimizes surface roughness to Ra < 0.6 μm, and elevates surface hardness to 417 HV, surpassing the base material by 103%. Through the EBSD analysis, significant grain refinement and the formation of a gradient micro‐nano structure due to the high‐strain‐rate plastic deformation induced by DRRT are confirmed. Through mechanical tests, a 353% increase in fatigue life is shown, with yield strength rising to 756 MPa and tensilencrease in fatigue life is shown, with yield strength rising to 756 MPa and tensile strength to 839 MPa after DRRT. Through the fatigue fracture morphology analysis, the superior fatigue resistance of the DRRT‐treated area is confirmed. Collectively, through these results, the effectiveness of DRRT in improving the mechanical properties and fatigue life of GH2787 superalloy are confirmed, providing valuable insights for its application in aerospace and aviation.