The 455 °C tensile and fatigue behavior of boron-modified Ti-6Al-2Sn-4Zr-2Mo-0.1Si(wt.%)

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Abstract

This work investigated the effect of nominal boron additions of 0.1 wt.%, 0.4 wt.%, and 1.0 wt.% on the elevated-temperature (455 °C) tensile and fatigue behavior of Ti-6Al-2Sn-4Zr-2Mo-0.1Si(wt.%) (Ti-6242S) castings. Boron additions stabilized the orthorhombic TiB phase where the average TiB-phase volume percents were 0.7, 2.3, and 5.4 for the Ti-6242S-0.1B(wt.%), Ti-6242S-0.4B(wt.%), and Ti-6242S-1B(wt.%) alloys, respectively. Larger TiB-phase volume fractions led to larger ultimate tensile strengths. The Ti-6242S-0.1B alloy exhibited the largest elongation-to-failure (εf = 10.3%) while the Ti-6242S-0.4B and Ti-6242S-1B alloys exhibited brittle fracture and εf values of approximately 1%. The fatigue S-N behavior was recorded for maximum applied stresses between 300 and 500 MPa (R = 0.1, 5 Hz). The Ti-6242S-0.1B(wt.%) alloy exhibited the longest average fatigue lives, which was suggested to be related to the ductility of this alloy. The Ti-6242S-1B(wt.%) alloy exhibited the lowest average fatigue lives and this was suggested to be related to the low εf and poor fatigue crack growth resistance. In situ fatigue crack growth experiments revealed that the TiB phase was the locus for cracking. Each alloy exhibited α-phase cracking and environmentally-assisted surface edge cracking. The fatigue behavior of the as-cast Ti-6242S-xB(wt.%) alloy system was comparable with that of the as-cast Ti-6Al-4V-xB(wt.%) alloy system, although the average fatigue lives of Ti-6242S-0.1B(wt.%) alloy were significantly greater than those for Ti-6Al-4V-0.1B(wt.%). Overall, the Ti-6242S-0.1B alloy exhibits the best combination of elevated-temperature tensile and tensile-fatigue properties of all the as-cast α+β TiB alloys studied to date.

LanguageEnglish (US)
Pages799-807
Number of pages9
JournalInternational Journal of Fatigue
Volume32
Issue number5
DOIs
StatePublished - May 2010

Profile

Boron
Fatigue
Fatigue of materials
Fatigue Life
Cracking
Fatigue Crack Growth
Fatigue crack propagation
Brittle Fracture
Ductility
Tensile Strength
Brittle fracture
Casting
Elongation
Volume Fraction
Percent
Categorical or nominal
Locus
Lowest
Volume fraction
Tensile strength

Keywords

  • Boron
  • Grain refinement
  • Microstructure
  • TiB
  • Titanium

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)
  • Modeling and Simulation

Cite this

The 455 °C tensile and fatigue behavior of boron-modified Ti-6Al-2Sn-4Zr-2Mo-0.1Si(wt.%). / Chen, W.; Boehlert, C. J.

In: International Journal of Fatigue, Vol. 32, No. 5, 05.2010, p. 799-807.

Research output: Contribution to journalArticle

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abstract = "This work investigated the effect of nominal boron additions of 0.1 wt.{\%}, 0.4 wt.{\%}, and 1.0 wt.{\%} on the elevated-temperature (455 °C) tensile and fatigue behavior of Ti-6Al-2Sn-4Zr-2Mo-0.1Si(wt.{\%}) (Ti-6242S) castings. Boron additions stabilized the orthorhombic TiB phase where the average TiB-phase volume percents were 0.7, 2.3, and 5.4 for the Ti-6242S-0.1B(wt.{\%}), Ti-6242S-0.4B(wt.{\%}), and Ti-6242S-1B(wt.{\%}) alloys, respectively. Larger TiB-phase volume fractions led to larger ultimate tensile strengths. The Ti-6242S-0.1B alloy exhibited the largest elongation-to-failure (εf = 10.3{\%}) while the Ti-6242S-0.4B and Ti-6242S-1B alloys exhibited brittle fracture and εf values of approximately 1{\%}. The fatigue S-N behavior was recorded for maximum applied stresses between 300 and 500 MPa (R = 0.1, 5 Hz). The Ti-6242S-0.1B(wt.{\%}) alloy exhibited the longest average fatigue lives, which was suggested to be related to the ductility of this alloy. The Ti-6242S-1B(wt.{\%}) alloy exhibited the lowest average fatigue lives and this was suggested to be related to the low εf and poor fatigue crack growth resistance. In situ fatigue crack growth experiments revealed that the TiB phase was the locus for cracking. Each alloy exhibited α-phase cracking and environmentally-assisted surface edge cracking. The fatigue behavior of the as-cast Ti-6242S-xB(wt.{\%}) alloy system was comparable with that of the as-cast Ti-6Al-4V-xB(wt.{\%}) alloy system, although the average fatigue lives of Ti-6242S-0.1B(wt.{\%}) alloy were significantly greater than those for Ti-6Al-4V-0.1B(wt.{\%}). Overall, the Ti-6242S-0.1B alloy exhibits the best combination of elevated-temperature tensile and tensile-fatigue properties of all the as-cast α+β TiB alloys studied to date.",
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N2 - This work investigated the effect of nominal boron additions of 0.1 wt.%, 0.4 wt.%, and 1.0 wt.% on the elevated-temperature (455 °C) tensile and fatigue behavior of Ti-6Al-2Sn-4Zr-2Mo-0.1Si(wt.%) (Ti-6242S) castings. Boron additions stabilized the orthorhombic TiB phase where the average TiB-phase volume percents were 0.7, 2.3, and 5.4 for the Ti-6242S-0.1B(wt.%), Ti-6242S-0.4B(wt.%), and Ti-6242S-1B(wt.%) alloys, respectively. Larger TiB-phase volume fractions led to larger ultimate tensile strengths. The Ti-6242S-0.1B alloy exhibited the largest elongation-to-failure (εf = 10.3%) while the Ti-6242S-0.4B and Ti-6242S-1B alloys exhibited brittle fracture and εf values of approximately 1%. The fatigue S-N behavior was recorded for maximum applied stresses between 300 and 500 MPa (R = 0.1, 5 Hz). The Ti-6242S-0.1B(wt.%) alloy exhibited the longest average fatigue lives, which was suggested to be related to the ductility of this alloy. The Ti-6242S-1B(wt.%) alloy exhibited the lowest average fatigue lives and this was suggested to be related to the low εf and poor fatigue crack growth resistance. In situ fatigue crack growth experiments revealed that the TiB phase was the locus for cracking. Each alloy exhibited α-phase cracking and environmentally-assisted surface edge cracking. The fatigue behavior of the as-cast Ti-6242S-xB(wt.%) alloy system was comparable with that of the as-cast Ti-6Al-4V-xB(wt.%) alloy system, although the average fatigue lives of Ti-6242S-0.1B(wt.%) alloy were significantly greater than those for Ti-6Al-4V-0.1B(wt.%). Overall, the Ti-6242S-0.1B alloy exhibits the best combination of elevated-temperature tensile and tensile-fatigue properties of all the as-cast α+β TiB alloys studied to date.

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KW - Boron

KW - Grain refinement

KW - Microstructure

KW - TiB

KW - Titanium

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T2 - International Journal of Fatigue

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