Effect of foreign object damage on fatigue performance of Inconel 718 welded joints.

Dislocations inside the material undergo rearrangement and annihilation driven by the impact energy; meanwhile, microstructural adjustments such as dynamic recovery and grain boundary migration make the intragranular orientation tend to be uniform, leading to a decreasing trend in the average Kernel Average Misorientation (KAM) values of both the BM and WJ. Σ3 coherent grain boundaries are special grain boundaries with low interfacial energy and high stability 22 , and their proportions show opposite evolutionary trends in the BM and WJ: the proportion of Σ3 grain boundaries decreases in the BM but increases in the WJ.

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