The elevated-temperature fatigue behavior of boron-modified Ti-6Al-4V(wt.%) castings

Research output: Contribution to journalArticle

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Abstract

This work investigated the effect of nominal boron additions of 0.1 and 1.0 wt.% on the elevated-temperature (455 °C) fatigue deformation behavior of Ti-6Al-4V(wt.%) castings for maximum applied stresses between 250 and 450 MPa (R = 0.1 and 5 Hz). Boron additions resulted in a dramatic refinement of the as-cast grain size, and larger boron additions resulted in larger titanium-boride (TiB) phase volume percents. The boron-containing alloys exhibited longer average fatigue lives than those for Ti-6Al-4V, which was suggested to be related to the reduced as-cast grain size and the addition of strong and stiff TiB phase. The Ti-6Al-4V-0.1B alloy exhibited the longest average fatigue lives. The TiB phase cracked during the fatigue experiments and this resulted in a decreasing Young's modulus with increased cycle number. Each alloy exhibited α-phase cracking and environmentally assisted surface edge cracking.

LanguageEnglish (US)
Pages132-138
Number of pages7
JournalMaterials Science and Engineering A
Volume494
Issue number1-2
DOIs
StatePublished - Oct 25 2008

Profile

titanium borides
Boron
Borides
boron
Fatigue of materials
Titanium
fatigue life
casts
boron alloys
grain size
Temperature
temperature
modulus of elasticity
Elastic moduli
cycles
Castings
titanium boride
Experiments

Keywords

  • Boron
  • Fatigue
  • Microstructure
  • Titanium

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

The elevated-temperature fatigue behavior of boron-modified Ti-6Al-4V(wt.%) castings. / Chen, W.; Boehlert, C. J.

In: Materials Science and Engineering A, Vol. 494, No. 1-2, 25.10.2008, p. 132-138.

Research output: Contribution to journalArticle

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N2 - This work investigated the effect of nominal boron additions of 0.1 and 1.0 wt.% on the elevated-temperature (455 °C) fatigue deformation behavior of Ti-6Al-4V(wt.%) castings for maximum applied stresses between 250 and 450 MPa (R = 0.1 and 5 Hz). Boron additions resulted in a dramatic refinement of the as-cast grain size, and larger boron additions resulted in larger titanium-boride (TiB) phase volume percents. The boron-containing alloys exhibited longer average fatigue lives than those for Ti-6Al-4V, which was suggested to be related to the reduced as-cast grain size and the addition of strong and stiff TiB phase. The Ti-6Al-4V-0.1B alloy exhibited the longest average fatigue lives. The TiB phase cracked during the fatigue experiments and this resulted in a decreasing Young's modulus with increased cycle number. Each alloy exhibited α-phase cracking and environmentally assisted surface edge cracking.

AB - This work investigated the effect of nominal boron additions of 0.1 and 1.0 wt.% on the elevated-temperature (455 °C) fatigue deformation behavior of Ti-6Al-4V(wt.%) castings for maximum applied stresses between 250 and 450 MPa (R = 0.1 and 5 Hz). Boron additions resulted in a dramatic refinement of the as-cast grain size, and larger boron additions resulted in larger titanium-boride (TiB) phase volume percents. The boron-containing alloys exhibited longer average fatigue lives than those for Ti-6Al-4V, which was suggested to be related to the reduced as-cast grain size and the addition of strong and stiff TiB phase. The Ti-6Al-4V-0.1B alloy exhibited the longest average fatigue lives. The TiB phase cracked during the fatigue experiments and this resulted in a decreasing Young's modulus with increased cycle number. Each alloy exhibited α-phase cracking and environmentally assisted surface edge cracking.

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