STP1367

    Influence of Microstructure on Fretting Fatigue Behavior of a Near-alpha Titanium Alloy

    Published: Jan 2000


      Format Pages Price  
    PDF (544K) 13 $25   ADD TO CART
    Complete Source PDF (13M) 13 $149   ADD TO CART


    Abstract

    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.

    Keywords:

    fretting fatigue, near-alpha titanium alloy, microstructure, shot peening, tangential force coefficient


    Author Information:

    Satoh, T
    Research scientist, Technical Research & Development Institute, Japan Defense Agency, Tokyo,


    Paper ID: STP14737S

    Committee/Subcommittee: E08.04

    DOI: 10.1520/STP14737S


    CrossRef ASTM International is a member of CrossRef.