Elevated-temperature mechanical behavior of As-cast and wrought Ti-6Al-4V-1B

W. Chen, C. J. Boehlert, J. Y. Howe, E. A. Payzant

Research output: Contribution to journalArticle

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Abstract

This work studied the effect of processing on the elevated-temperature [728 K (455 °C)] fatigue deformation behavior of Ti-6Al-4V-1B for maximum applied stresses between 300 to 700 MPa (R = 0.1, 5 Hz). The alloy was evaluated in the as-cast form as well as in three wrought forms: cast-and-extruded, powder metallurgy (PM) rolled, and PM extruded. Processing caused significant differences in the microstructure, which in turn impacted the fatigue properties. The PM-extruded material exhibited a fine equiaxed α+β microstructure and the greatest fatigue resistance among all the studied materials. The β-phase field extrusion followed by cooling resulted in a strong α-phase texture in which the basal plane was predominately oriented perpendicular to the extrusion axis. The TiB whiskers were also aligned in the extrusion direction. The α-phase texture in the extrusions resulted in tensile-strength anisotropy. The tensile strength in the transverse orientation was lower than that in the longitudinal orientation, but the strength in the transverse orientation remained greater than that for the as-cast Ti-6Al-4V. The ratcheting behavior during fatigue is also discussed.

LanguageEnglish (US)
Pages3046-3061
Number of pages16
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume42
Issue number10
DOIs
StatePublished - Oct 2011

Profile

powder metallurgy
Extrusion
casts
Powder metallurgy
Fatigue of materials
tensile strength
textures
microstructure
Tensile strength
Textures
Temperature
Microstructure
temperature
Processing
cooling
anisotropy
Anisotropy
Cooling

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys
  • Mechanics of Materials

Cite this

Elevated-temperature mechanical behavior of As-cast and wrought Ti-6Al-4V-1B. / Chen, W.; Boehlert, C. J.; Howe, J. Y.; Payzant, E. A.

In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 42, No. 10, 10.2011, p. 3046-3061.

Research output: Contribution to journalArticle

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