The influence of contacting Ni-based single-crystal superalloys on fretting fatigue of Ni-based polycrystalline superalloys at high temperature

• Published in: Tribology international 2014-08, Vol.76, p.63-72
• Main Authors: Fleury, R.M.N., Paynter, R.J.H., Nowell, D.
• Format: Article
• Language: English
• Subjects: Contact; Contact mechanics; Contact stresses; Crystallography; Fatigue (materials); Fretting fatigue; Mathematical analysis; Ni-based superalloys; Nickel; Orientation; Single crystals; Single-crystal
• ISSN: 0301-679X; 1879-2464
• DOI: 10.1016/j.triboint.2014.01.011

Fretting fatigue tests at high temperature were carried out with single-crystal and polycrystalline alloys. The influence of the crystallographic orientation of contacting single-crystal pads on the lives of polycrystalline specimens is investigated. An analytical formulation of the contact problem between two anisotropic cylinders is used to study the changes in peak stress and contact width due to the orientation of the single-crystal. Finite element analysis is also used to study the variation of stress near the contact edge due to crystallographic orientation. An area averaging method is suggested to correlate fretting fatigue and plain fatigue curves. Using finite element analysis combined with the area averaging method, a better correlation was found between fretting fatigue results and plain fatigue. •Fretting fatigue experiments with Ni-based alloys were conducted.•An analytical solution of anisotropic contact is used to calculate the tractions.•Contact normal peak stress varies with the crystal orientation of single-crystals.•Stresses in the specimens change with the crystal orientation of single-crystals.•A better correlation of fretting fatigue is obtained by averaging contact stresses.