Effect of the Lattice Curvature of Ti-6Al-4V Titanium Alloy on Their Fatigue Life and Fracture Toughness

V. E. Panin, B. B. Ovechkin, R. R. Khayrullin, A. M. Lider, Yu S. Bordulev, A. V. Panin, O. B. Perevalova, I. V. Vlasov

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1 Citation (Scopus)

Abstract

Abstract: The effect of hydrogen charging, ultrasonictreatment, and hydrogen charging after ultrasonic treatment on thefatigue life of VT6 alloy is investigated. Ultrasonic treatment causesthe formation of a continuous nonetching α2(Ti3Al)layer within the surface layer, which reduces the fatigue life. Belowthis layer there are bands of the α2(Ti3Al) phasewhich, on the contrary, increase the fatigue life. These two effectstogether give a 1.3-fold increase in the fatigue life of the alloy. Acatastrophic decrease in hydrogen charging after ultrasonic treatment isexplained by the formation of regions of short-range displacements witha bcc lattice similar to the β phase. As a result of radial shearrolling, a martensitic phase with very high strength is formed in thealloy. Its formation is predicted by positron annihilation spectroscopyand is detected by transmission electron microscopy. The high stabilityof the martensitic phase contributes to the lower fracture toughness ofthe alloy processed by radial shear rolling.

Original languageEnglish
Pages (from-to)369-375
Number of pages7
JournalPhysical Mesomechanics
Volume23
Issue number5
DOIs
Publication statusPublished - Sep 2020

Keywords

  • Fracture toughness
  • Hydrogen charging
  • Lattice curvature
  • Martensitic phase
  • Radial shear rolling
  • Ultrasonic treatment

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Surfaces and Interfaces

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