期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.01.054
关键词
Fatigue; Fracture mechanics; Titanium; Fractography; Grain refinement; EBSD
类别
资金
- Japan Society for the Promotion of Science (JSPS) [15K05677]
- Light Metal Educational Foundation, Inc.
- Grants-in-Aid for Scientific Research [15K05677] Funding Source: KAKEN
Commercially pure (CP) titanium with a bimodal harmonic structure, which is defined as coarse grained regions surrounded by a network of fine grains, was fabricated by consolidating mechanically milled powders to improve both strength and ductility. In order to determine the fatigue properties of bimodal harmonic structured CP titanium, four-point bending fatigue tests were conducted at a stress ratio of 0.1 under ambient conditions. The fracture surfaces were analyzed by scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) to identify the mechanisms of small fatigue crack initiation and propagation on the basis of fractography and crystallography. The fatigue crack initiation resistance was increased compared to sintered compacts fabricated from as-received initial powders, which was attributed to grain refinement during mechanical milling. Transgranular fracture occurred from coarse grains with a basal plane perpendicular to the loading direction. The fatigue crack path in harmonic structured CP titanium was not influenced by the microstructure.
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