Improving high temperature fretting fatigue performance of nickel-based single crystal superalloy by shot peening

Tianyu Yuan, Min Dou, Lu Liu, Lei Li, Shouyi Sun, Chuanyun Hu

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

Fretting fatigue (FF) is one of the main causes of turbine blade failure. In this study, the FF tests of a nickel-based single crystal (NBSC) superalloy treated by shot peening (SP) are conducted at 600 °C. Results show that the FF lives of shot-peened specimens are improved by up to 4 times compared to the unpeened ones. SP increases the dislocation density of the surface layer, which results in the increased hardness, and the maximum compressive residual stresses (CRS) can reach to −1016 MPa. The large CRS reduces the true stress acting on the fretting contact region, and high-density dislocation retards the crack initiation and propagation, both of which contribute to the prolonged FF life. This work provides an effective strategy for the anti-fretting fatigue strenghening of NBSC superalloy.

Original languageEnglish
Article number107563
JournalInternational Journal of Fatigue
Volume171
DOIs
StatePublished - Jun 2023

Keywords

  • Fretting fatigue
  • High temperature
  • Nickel-based single crystal superalloy
  • Shot peening
  • Strengthing mechanism

Fingerprint

Dive into the research topics of 'Improving high temperature fretting fatigue performance of nickel-based single crystal superalloy by shot peening'. Together they form a unique fingerprint.

Cite this