期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 100, 期 -, 页码 377-387出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2017.03.020
关键词
Crystal plasticity; Dwell fatigue; Length-scale effects; Dual-phase titanium alloy
资金
- Irish Research Council
- Royal Academy of Engineering/Rolls-Royce research chair
- Engineering and Physical Science Research Council (through HexMat)
- EPSRC [EP/K034332/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K034332/1] Funding Source: researchfish
This paper investigates the role of beta phase on the micro-mechanical behaviour of dual-phase titanium alloys, with particular emphasis on the phenomenon of cold dwell fatigue, which occurs in such alloys under room temperature conditions. A strain gradient crystal plasticity model is developed and calibrated against micro-pillar compression test data for a dual-phase alpha-beta specimen. The effects of key microstructural variables, such as relative beta lath orientation, on the micromechanical response of idealised alpha-beta colony microstructures are shown to be consistent with previously-published test data. A polycrystal study on the effects of the calibrated alpha-beta crystal plasticity model on the local micromechanical variables controlling cold dwell fatigue is presented. The presence of the alpha-beta phase is predicted to increase dwell fatigue resistance compared to a pure alpha phase microstructure. (C) 2017 Elsevier Ltd. All rights reserved.
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