Fatigue Behavior of Solution Treated and Quenched Ti-6Al-4V.
Abstract
The effect of solution treating and quenching on titanium alloy Ti-6Al-4V was studied as a means to improve its fatigue resistance. Four separate heats of Ti-6Al-4V rod and one heat of sheet material were solution treated at temperatures ranging from 825 to 1040 C, and then water quenched. Screening tests were performed on the rod materials by fatigue testing at one level of constant strain amplitude (approx. + or - 1%) to determine the relative fatigue resistance and the overall heat treat responsiveness of each heat. Subsequently, selection of one heat was made for more complete evaluation of low and high cycle fatigue behavior and tensile properties. A relative measure of fatigue crack initiation resistance for various solution treated and quenched conditions of the sheet material was determined by acoustic emission. The fatigue test results for these materials showed that solution treating at particular temperatures in the alpha - beta field follwed by quenching produced improvements in fatigue resistance compared to the annealed and solution treated plus aged conditions. Based on acoustic emission tests during fatigue cycling, solution treated and quenched material had improved resistance to early stage fatigue crack initiation. The optimum solution treated and quenched materials were characterized by low yield strength, low elastic moduli, high uniform and total strains, and high work hardening rates.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1981
- Accession Number
- ADA116663
Entities
People
- James R. Kennedy
Organizations
- Grumman