Plastic Flow and Fatigue Behavior of Alpha-Beta Titanium Alloys.
Abstract
Void formation, void growth and tensile fracture was studied in ELI Ti-6Al-4V heat treated to strengths of 110 ksi (758 MN/sq m) to 140 ksi (965 MN/sq m) for both equiaxed and Widmanstatten plus grain boundary alpha structures. Void formation occurred at alpha-matrix interface, at alpha-alpha boundaries and at twin-untwin interfaces within alpha particles. Void growth was found to be a function of microstructure, being more rapid at grain boundary alpha-matrix locations than in equiaxed alpha structures. A plot of corrected fracture stress, shows separate curves with about the same slope, for equiaxed and grain boundary alpha structures, with the equiaxed alpha structures showing the higher fracture stresses. The dependency of void growth at grain boundaries on grain size and strain hardening rate is discussed. Initial work on low cycle fatigue behavior at constant strain of the Ti-6Al-2Sn-4Zr-6Mo alloy is outlined, and plans for the study of factors controlling the yield strength of alpha-beta Ti alloys are presented.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1976
- Accession Number
- ADA026609
Entities
People
- Harold Margolin
- Yashwant Mahajan
Organizations
- New York University