High-Cycle Fatigue Crack Initiation and Growth in TIMETAL LCB

This investigation has examined the influence of grain boundary α contiguity on the high-cycle fatigue behavior of aged TIMETAL LCB, with the fatigue performance being evaluated under tension-tension loading conditions atR=0.1 in laboratory air and 25 Hz. Fractographic analysis indicated that fatigu...

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Bibliographic Details
Published in:Journal of materials engineering and performance 2005-12, Vol.14 (6), p.773-777
Main Authors: Kokuoz, Basak Yazgan, Kosaka, Yoji, Rack, H.J.
Format: Article
Language:English
Subjects:
Crack initiation
Crack propagation
Fatigue failure
Fracture mechanics
Grain boundaries
High cycle fatigue
Materials engineering
Serials
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Summary:This investigation has examined the influence of grain boundary α contiguity on the high-cycle fatigue behavior of aged TIMETAL LCB, with the fatigue performance being evaluated under tension-tension loading conditions atR=0.1 in laboratory air and 25 Hz. Fractographic analysis indicated that fatigue initiation, independent of processing history, involved subsurface crack formation. Serial section studies also indicated that crack initiation occurred at the interface between the triple-point α and the aged β matrix. Further back-scattered electron microscopy examination of the aged microstructures indicates that the observed differences in high-cycle fatigue behavior can be understood by considering the effect of processing history on the connectivity of grain boundary α, with decreased connectivity being associated with enhanced fatigue performance.[PUBLICATION ABSTRACT]
ISSN:1059-9495
1544-1024
DOI:10.1361/105994905X75592