Figure 5
From: A novel post-weld treatment using nanostructured metallic multilayer for superior fatigue strength
Schematic depictions of underlying principles of improved fatigue resistance: (a) Influenced crack propagation through NMM; (b) Introduction of residual tensile stresses in the NMM and equivalent compressive stresses in the steel substrate adjacent to the surface; (c) Reduction of surface roughness; (d): Suppression of PSB by hard coating application; (e) TEM image of complex crack propagation across NMM; (f) Synchrotron energy data revealing residual compressive stress gradient in steel surface proximity after NMM application; (g) SEM image with visualized surface roughness reduction; (h) Image of visible extrusions in HAZ after cyclic loading.
