期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 131, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2019.105355
关键词
Titanium alloys; Fatigue initiation; Grain boundary alpha; Electron backscattered diffraction; High cycle fatigue
资金
- US Department of Energy (US DOE), Innovative Manufacturing Initiative, through the Advanced Manufacturing Office [DEEE0005761]
- Office of Energy Efficiency and Renewable Energy
- National Science Foundation [1561752]
- Army Research Laboratory [W911NF-17-2-0145]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1561752] Funding Source: National Science Foundation
The hydrogen sintering and phase transformation (HSPT) process is a powder metallurgy method that produces Ti-6Al-4V with fatigue properties rivaling wrought processed Ti-6Al-4V. Previous fatigue work on HSPT Ti-6Al-4V has shown failure to be frequently caused by microstructural facets, which were believed to be grain boundary (GB) alpha phase. This belief conflicts with other reports as fatigue failure typically occurs across alpha colonies or primary alpha grains, not GB alpha. In this work, electron backscattered diffraction is used to identify these facets as GB alpha. Furthermore, alpha simple geometric model predicting the effective slip length of GB alpha is presented.
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