High temperature fatigue behavior of a near-alpha titanium alloy.pdf (21.06 MB)
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High temperature fatigue behavior of a near-alpha titanium alloy

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journal contribution
posted on 16.09.2022, 09:47 authored by Z Zhao, R Zhou, Z. Wang, J Cai, B Chen
High-cycle and very-high-cycle fatigue at 450 °C in near-α titanium with bi-modal microstructure are investigated. Stress-life duality appears with one data group spanning from 105 to 107 and the other from 107 to 109 cycles, characterized by surface and subsurface cracking, respectively. Misfit strain induced by the high misorientation of a particular primary α-grain relative to its surroundings, termed as local texture, promotes the subsurface fatigue-crack initiation. Fatigue strength increases up to 100 MPa owing to cyclic pre-strain at 450 °C, but the duality remains. Strain hardening by activation of prismatic slip is responsible for the improved fatigue strength.

Funding

enabling Sixty Years creep-fatigue life of the NExt generation nuclear Reactors 'SYNERgy'

Engineering and Physical Sciences Research Council

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National Natural Science Foundation of China (91860110, 51571009) and the National Science and Technology Major Project of China (J2019-VI-0022-0138)

History

Author affiliation

School of Engineering, University of Leicester

Version

VoR (Version of Record)

Published in

International Journal of Fatigue

Volume

161

Publisher

Elsevier

issn

0142-1123

eissn

1879-3452

Copyright date

2022

Available date

16/09/2022

Language

English