期刊
JOURNAL OF MICROSCOPY
卷 233, 期 3, 页码 451-459出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2818.2009.03141.x
关键词
Dwell-fatigue fracture; EBSD; fractography; macrozone; quasi-cleavage; titanium
类别
The microstructure and the local texture of a large IMI 834 forging were characterized using the Electron Back Scattered Diffraction (EBSD) technique. Crystallographic domains called macrozones and formed by a majority of primary alpha(p) grains with their axes in nearly the same direction were found. They had a band-like structure, parallel to the axial direction of the forging. The influence of these macrozones on the cold dwell-fatigue properties was studied. Several samples were tested under cold dwell-fatigue conditions. The crack initiation and the short-distance propagation region optically matched a bright region that contained numerous quasi-cleavage facets. The analysis of the EBSD measurements showed that this bright region was enclosed within a sharp textured region with axes at less than 30 degrees from the loading axis. The crystallographic features of the crack nucleation site and the crack propagation path were also analysed.
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