Influence of Crystal Orientation on Cyclic Sliding Friction and Fretting Fatigue Behavior of Single Crystal Ni‐Base Superalloys

Role of tangential force coefficient on fretting fatigue life estimation of a single crystal Ni-base superalloy

“…This transition can be attributed to the competition between contact stresses arising from fretting action and the bulk stress amplitude. In our previous study, in addition to primary crack propagation into the material, secondary cracks and surface cracks were also found to be grown as a result of localized stress concentrations along stick-slip interface (Rengaraj et al, 2016). These experimental evidences suggest that the …”

“…Detrimental effect of fretting on the fatigue life of superalloys is evident. Fretting fatigue strength of SC CMSX-2 was lower than PC IN718 (Rengaraj et al, 2016).…”

“…The outline of experimental results of SC superalloy has been already given in the reference (Rengaraj et al, 2016), however, for better undetstanding of later Section 4, the core part is briefly surveyed again by comparing the experimental results of PC superalloy as below. Fig.…”

“…For the case of contact between SC and PC alloys, the stress state below the contact must be sensitive to secondary crystallographic orientation of SC with respect to contact pressure direction (or fretting plane normal) (Rengaraj et al, 2016). In order to explore this aspect, fretting fatigue tests (under identical loading conditions) were carried out with SC specimens having different secondary crystallographic orientations β as schematically shown in Fig.…”

“…These tests were carried out by the same procedure as in our previous research (Rengaraj et al, 2016). Next, main focus was put on fretting fatigue life prediction, correlating the experimental results with the results of analytical study Rengaraj, Baba and Okazaki, Mechanical Engineering Journal, Vol.4, No.5 (2017) [DOI: 10.1299/mej.…”