Effects of microtexture and Ti3Al (α2) precipitates on stress-corrosion cracking properties of a Ti-8Al-1Mo-1V alloy

Sheng Cao, Chao Voon Samuel Lim, Bruce Hinton, Xinhua Wu

Research output: Contribution to journalArticleResearchpeer-review

10 Citations (Scopus)

Abstract

Effects of microtexture and Ti3Al (α2) precipitates on the Stress-Corrosion Cracking (SCC) properties of Ti-8Al-1Mo-1V (Ti-811) have been investigated using a constant displacement SCC test in 0.1 M aqueous sodium chloride (NaCl) solution. SEM, TEM, and EBSD were employed to characterize microstructure and microtexture. Results reveal that both microtexture and α2 precipitates increase the SCC susceptibility of Ti-811. The SCC propagation direction aligns with microtextured regions, and most α grains were preferentially orientated for basal <a> slip along the SCC crack. SCC susceptibility was eliminated by implementing hot isostatic pressing (HIPping) and post heat-treatment processes through eliminating both crystallographic microtexture and α2 precipitates. Fractography showed that the formation mechanism of the propagation facets could be attributed to Hydrogen Enhanced Localized Plasticity (HELP).

Original languageEnglish
Pages (from-to)22-33
Number of pages12
JournalCorrosion Science
Volume116
DOIs
Publication statusPublished - 15 Feb 2017

Keywords

  • A. Titanium
  • B. SEM
  • B. TEM
  • C. Hydrogen embrittlement
  • C. Stress corrosion

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