Surface characterization and fatigue evaluation in GH4169 superalloy : Comparing results after finish turning; shot peening and surface polishing treatments

Effect of Turning and Surface Polishing Treatments on Surface Integrity and Fatigue Performance of Nickel-Based Alloy GH4169

“…It is attributed to a very thin layer of plastic deformation was removed by the surface polishing treatment. Similar results were presented in our previous work [14,20]. Gao et al [21] reported that surface residual stress of grinding 40CrNi2Si2MoVA steel was −400 MPa and decreased to −80 MPa after electro-polishing.…”

“…The as received GH4169 has a yield strength of 1336 MPa at room temperature. The nominal chemical composition and the mechanical properties of GH4169 alloy are the same as those employed in the previous studies [14,15]. GH4169 superalloy heat treatment procedure: at 720 • C for 8 h, furnace cooled to 620 • C at a cooling rate of 50 • C/h, and holding at 620 • C for 8 h, air cool.…”

“…Avilés et al [13] reported that by comparison with the non-treated specimens, the surface roughness of ball-burnished AISI 1045 steel specimens reduced, and the fatigue lives increased to 3.25 × 10 6 cycles. Wu et al [14] reported that post-peening polishing treatment greatly reduced the surface roughness (from 2.423 µm to 0.041 µm) of GH4169 alloy, and the fatigue life increased by 48.9%. These comparisons indicate that surface integrity has a significant impact on the fatigue life of components.…”

Surface, Subsurface and Tribological Properties of Ti6Al4V Alloy Shot Peened under Different Parameters

“…Surface topography and morphology are important characteristics which affect the tribological behavior of materials [ 3 , 84 , 85 ]. It is stated that the surface roughness of shot peened materials depends on many factors, e.g., impingement pressure and impingement angle [ 5 , 59 , 86 ], shot size, and peening duration [ 5 , 87 ]. The present study focused on the effects of peening duration (5 and 15 min) and shot size (S10 and S60) while keeping the impingement angle and pressure steady.…”

“…As each shot transfers its kinetic energy, plastic deformation on the sample surface may create craters. This mechanism repeats several times during the shot peening, which modifies the surface by forming peaks (characterised by high points of pile-up) and valleys (characterised by low points of craters) up to some extent [ 86 , 89 , 90 ]. Thus, the modification of the surface with plastic deformation could be considered the main reason for increased surface roughness [ 89 , 90 , 91 ].…”