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To investigate the effect of microstructure on the fretting fatigue behavior of a near-α titanium alloy, fretting fatigue tests were carried out using DAT54, which is used in compressor blades and disks in aircraft gas turbine engines. Two kinds of microstructure in DAT54 were prepared using different solution heat treatment temperatures: one is the equiaxed α + α lath microstructure and the other is the transformed β structure. The plain and fretting fatigue strengths for the equiaxed α + α lath microstructure are higher than for the transformed β structure. Fretting reduced fatigue strengths by a factor of three for both materials. Sensitivity to microstructure in fretting fatigue is relatively low compared with plain fatigue. Shot peening improved fretting fatigue life, because of lower tangential force between the specimen and the contact pad and because of residual stress in compression induced by shot peening treatment.
fretting fatigue, near-alpha titanium alloy, microstructure, shot peening, tangential force coefficient
Research scientist, Technical Research & Development Institute, Japan Defense Agency, Tokyo,