MATEC Web Conf.
Volume 321, 2020The 14th World Conference on Titanium (Ti 2019)
|Number of page(s)||6|
|Section||Microstructure - Properties Relationships|
|Published online||12 October 2020|
Assessment of 3D Short Crack Closure in Ti-6Al-4V Alloy Utilizing Synchrotron X-ray Microtomography
1 Department of Mechanical Engineering, Kyushu University, 744, Motooka, Nishi Ward, Fukuoka, Fukuoka 819-0395, Japan
2 Japan Synchrotron Radiation Research Institute, 1-1-1, Kouto, Sayo Cho, Sayo Gun, Hyogo 679-5148, Japan
Synchrotron X-ray microtomography was utilized to observe the complex 3D crack morphology and the closure behavior of a short crack in Ti-6Al-4V alloy. The aim of the study was to investigate the effect of the crack path evolution on the 3D short crack closure behavior. In situ fatigue tests at R = 0.1 were carried out using microtomography with a spatial resolution of 1 μm. The 3D crack morphology was observed in detail consisting of non-facets (zigzag), branching, and facets with deflection angles indicating the presence of mode II and mode III displacements. The crack grows with facet-like paths mainly in α grains as compared to the non-facet paths in the α+β grains. The change in the crack path from facet-like paths to non-facet-like paths in the larger crack front induces an increase in the fractional area of closed patches.
Key words: Short crack / crack closure / microtomography / synchrotron radiation / volume rendering
© The Authors, published by EDP Sciences, 2020
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