The elevated-temperature mechanical behavior of as-cast and wrought Ti-6Al-4V-1B

Journal Article · Sat Jan 01 04:00:00 EST 2011 · Metallurgical and Materials Transactions A

DOI:https://doi.org/10.1007/s11661-011-0618-y· OSTI ID:1023822

Chen, Wei ^[1]; Boehlert, C. J. ^[2]; Howe, Jane Y ^[1]; Payzant, E Andrew ^[1]

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1. ORNL
2. Michigan State University, East Lansing

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 {alpha} + {beta} microstructure and the greatest fatigue resistance among all the studied materials. The {beta}-phase field extrusion followed by cooling resulted in a strong {alpha}-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 {alpha}-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.

• Research Organization: Oak Ridge National Laboratory (ORNL); High Temperature Materials Laboratory; Shared Research Equipment Collaborative Research Center
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1023822
• Journal Information: Metallurgical and Materials Transactions A, Journal Name: Metallurgical and Materials Transactions A Journal Issue: 10 Vol. 42A; ISSN 1073-5623
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
ANISOTROPY
DEFORMATION
EXTRUSION
MICROSTRUCTURE
ORIENTATION
POWDER METALLURGY
PROCESSING
RATCHETING
STRESSES
TENSILE PROPERTIES
TEXTURE