Friction Surface Evolution of Ni-Based Superalloy with Addition of Revert at High Temperature

Abstract

Two superalloys with and without revert were tested under dry sliding at 730℃ for 1, 15, 30, and 60 minutes. The results show that revert addition improves wear resistance and reduces subsurface crack formation. The wear mechanism shifts from abrasive-adhesive to oxidative-adhesive wear. A 40% drop in friction coefficient occurs within 2.5 min. After 1 min, the oxide layer is discontinuous, but after 15 min, it becomes more developed, enriched with Al, Cr, and Ti. Wear debris undergoes compaction and sintering, forming a dense oxide layer. With extended sliding (30-60 min), a multi-layered structure with an internal oxide and a glaze-like outer layer forms on the revert-containing sample.

Keywords: Friction surface, Superalloys, Revert addition, High temperature