Microstructure and notched high-cycle fatigue property of laser melting deposited TC18 titanium alloy

Yang Wang*, Shuquan Zhang, Changmeng Liu, Haibo Tang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Microstructure and high-cycle fatigue property of notched specimens of laser melting deposited (LMD) TC18 titanium alloy were investigated. The results show that as-deposited microstructure consists of directional short column grains and equiaxial grains, with extremely fine basket-weave microstructure. After double-annealing treatment, coarse lamellar-like basket-weave microstructure was obtained. With the increasing of maximum cyclic stress, the length of main crack and fatigue life decreased. The SEM micrographs indicate that the notched fatigue crack source of LMD TC18 titanium alloy was alone and initiated at the surface of the notch root. Two types of secondary cracks were detected at the fatigue crack propagation zone. The secondary cracks help consume energy and improve the fatigue strength.

Original languageEnglish
Pages (from-to)10-13
Number of pages4
JournalJinshu Rechuli/Heat Treatment of Metals
Volume38
Issue number5
Publication statusPublished - May 2013
Externally publishedYes

Keywords

  • Fatigue
  • Laser melting deposition (LMD)
  • Microstructure
  • Titanium alloy

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