Role of microstructure in the mean stress dependence of fatigue strength in Ti-6Al-4V alloy
Conference
·
OSTI ID:20013306
The high cycle fatigue properties of Ti-6Al-4V alloy with six different microstructure/texture combinations were investigated. Only materials with lamellar and fine bimodal microstructures exhibited linear Goodman relationship on the constant fatigue life diagram. Materials with coarse bimodal and equiaxed microstructures had anomalous mean stress dependency, with HCF strength at intermediate mean stresses being significantly lower than predicted by Goodman relationship, regardless of whether material was forged or cross-rolled. The role of microstructure in mean stress sensitivity behavior of Ti-6Al-4V is studied. Cyclic strain tests were conducted for all microstructures, and the results of strain-controlled and stress-controlled cyclic tests are compared and discussed.
- Research Organization:
- Worcester Polytechnic Inst., MA (US)
- Sponsoring Organization:
- US Department of the Air Force
- OSTI ID:
- 20013306
- Country of Publication:
- United States
- Language:
- English
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