Effect of microstructure and relaxation behavior on the high temperature low cycle fatigue of near-alpha-Ti-1100

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The influence of lamellar or bi-modal microstructures on high temperature LCF behavior in Ti-1100 was investigated at 600 degrees C. Under various creep-fatigue conditions, as the hold-time increases, the fatigue lives of specimens of both lamellar and bi-modal structures reduce compared with those of continuous cycling of the same specimens. it is understood that longer hold-time results in severe creep damage accumulation due to stress relaxation, leading to reduced fatigue life. Specimens with a bi-modal structure show about double the values of relaxed stress normalized with tensile peak stress of specimens with lamellar structure in the same test conditions, resulting in a higher reduction rate of fatigue life. In addition, as hold-time extends, the difference in total hysteresis loop energy between lamellar and bi-modal structures becomes smaller. Therefore, it can be said that creep damage resulting from stress relaxation during hold-time is more detrimental in bi-modal than in lamellar structures. (C) 2000 Published by Elsevier Science S.A.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2000-10
Language
English
Article Type
Article
Keywords

NEAR-ALPHA TI-1100; LAMELLAR STRUCTURE; ALLOY

Citation

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v.291, no.1-2, pp.60 - 67

ISSN
0921-5093
DOI
10.1016/S0921-5093(00)00974-6
URI
http://hdl.handle.net/10203/69605
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