Crack initiation and short crack propagation of friction stir welded TC17 alloy joint

Jun Song, Hanqing Liu, Jie Cui, Yongjie Liu, Lang Li, Yao Chen, Qingyuan Wang, Qiang Chen

Research output: Contribution to journalArticlepeer-review

Abstract

Heterogeneities of microstructure, tensile and fatigue behavior of FSWed titanium alloy joint were in-situ studied by utilizing replica, DIC and electron back-scattered diffraction methods. Banded TMAZ consisting of needle-like α precipitates and elongated αp within DRXed β grains bridges the HAZ and SZ. Fine β grains in SZ contribute to the highest tensile strength in the 3rd layer. Fatigue cracks prefer to nucleate from HAGBs and {1 1 2} 〈1 1 1〉 slip deformation of β structure in the 2nd layer of SZ below 210 MPa and 3rd layer of HAZ otherwise. Transgranular crack propagation along the {1 1 2} planes exhibits a higher crack growth rate in HAZ than SZ.

Original languageEnglish
Article number107426
JournalInternational Journal of Fatigue
Volume168
DOIs
Publication statusPublished - Mar 2023

All Science Journal Classification (ASJC) codes

  • Modelling and Simulation
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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