Enhancement of Fatigue Crack Growth and Fracture Resistance in Ti-6Al-4V and Ti-6Al-6V-2Sn Through Microstructural Modification.
Abstract
Significant enhancement of fatigue crack propagation resistance and plan-strain fracture toughness was obtained in commercial-purity Ti-6Al-4V and Ti-6Al-6V-2Sn by microstructural modification. These alloys were studied in 25.4-mm-thick plates with interstitial oxygen contents of 0.20 and 0.17 weight percent, respectively. Heat treatments were chosen to provide widely varied microstructures; they were a mill anneal, a recrystallization anneal, and a beta anneal. The beta anneal was found to be best for improving the crack tolerance properties in question, but it reduced yield strength 9-14% from levels associated with the original mill anneal. The recrystallization anneal significantly enhanced plane-strain fracture toughness and marginally improved fatigue crack propagation resistance with negligible loss of yield strength. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 24, 1976
- Accession Number
- ADA033687
Entities
People
- George R. Yoder
- L. A. Cooley
- Thomas W. Crooker
Organizations
- United States Naval Research Laboratory