Research Article
Titanium Alloy Repair with Wire-Feed Electron Beam Additive Manufacturing Technology
Figure 19
LCF fracture surface of PMZ (failure at ∼5 × 103 cycles): (a) overall fracture surface (arrow designates surface region where failure initiated), (b) the region of crack initiation and outward progression of fatigue damage, (c) the flat and nearly featureless transgranular surface in the region of early crack growth, (d) high-magnification imaging of the region of stable crack growth showing a distribution of fine microscopic cracks, as well as areas of fine and shallow striations, and (e) fine microscopic voids in the region of unstable crack growth (overload).
| (a) |
| (b) |
| (c) |
| (d) |
| (e) |