Slip-driven and weld pore assisted fatigue crack nucleation in electron beam welded TC17 titanium alloy joint

Hanqing Liu, Jun Song, Haomin Wang, Chuanli Yu, Yaohan Du, Chao He, Qingyuan Wang, Qiang Chen

Research output: Contribution to journalArticlepeer-review

Abstract

High cycle and very high cycle fatigue (VHCF) crack initiation mechanism of TC17 alloy joint with heterogeneous microstructures in FZ has been studied at the stress ratio of 0.1. Intrinsic deficiencies of slip deformation in β grains with few martensites and cracking coarse grain boundary between prior β grains with martensite colonies account for the high cycle fatigue (HCF) of joints. The average diameter of intergranular welding pores regarding VHCF crack nucleation is measured to be ∼36 μm. The driving force governing the crack nucleation from intrinsic deficiencies in HCF to porosity defects in VHCF is ∼1.66 MPa·m1/2.

Original languageEnglish
Article number106525
JournalInternational Journal of Fatigue
Volume154
DOIs
Publication statusPublished - Jan 2022

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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