Tribological Behavior of a Shot-Peened Nickel-Based Single Crystal Superalloy at High Temperature

Abstract

The tribological behavior of a nickel-based single crystal (NBSC) superalloy treated by shot-peening has been investigated. Friction tests under three normal loads and three temperatures were carried out based on the ball-on-disc con guration. The results showed that coe cient of friction (COF) and wear rate of the shot-peened superalloy at room temperature were nearly 2 times and 4 times that at 600 ℃, respectively. However, there were no signi cant difference in COF and wear rate between the shot-peened NBSC superalloy and the as-received NBSC superalloy, which was ascribed to the competing effects between the increased hardness and the increased roughness of NSBC superalloy after shot-peening. High temperature friction promoted the formation of a glaze-layer on the substrate, which was derived from the sintering and compacting of oxidized wear debris. The formed glaze-layer prevented the direct contact of the friction pair and contributed to the reduced COF and wear rate. The wear mechanism of the SP-NSBC superalloy at high temperature included oxidation, adhesion, and abrasion. With the decreasing normal load and increasing temperature, the adhesive wear weakened. This work provided insights into the effects of shot-peening treatment on the tribological properties of NBSC superalloy.

Solid-State Cold Spray Additive Manufacturing of Ni-Based Superalloys: Processing–Microstructure–Property Relationships

“…First, the primary mechanism for the high-temperature lubrication is due to the formation of the NiO phase at elevated temperatures. Due to the general composition of Ni-based superalloys, the combination of nickel oxides, as well as chromium oxides (i.e., Cr 2 O 3 ), allows for a solid-like film that can act as a barrier against abrasion [ 114 ]. This would explain the smoothened wear tracks and reduced wear/COF seen in Figure 15 d,e and Figure 16 a,b, especially considering the porous defects of CS (which can oftentimes result in premature brittle fracturing under abrasion [ 115 ]), where these glaze-like characteristics can be of great advantage in such high-temperature environments.…”

Atomic-scale study of linear reciprocating friction of TCP/γ phase in nickel-based single crystal alloy

“…In recent years, owing to the rapid growth of the aviation industry, Nickel-based single crystal (NBSC) superalloys have garnered increasing attention due to their exceptional mechanical properties and structural stability, particularly in applications such as turbine blades for aviation engines [1][2][3][4]. The progress of the aviation industry is inseparable from the enhancement of precision in aerospace engine components.…”