A fatigue life posterior analysis approach for laser-directed energy deposition Ti-6Al-4V alloy based on pore-induced failures by kernel ridge

•Microstructure and stress intensity features dominate fatigue life of laser-directed energy deposition Ti-6Al-4V alloy.•A fine granular area existence prediction and subsequent fatigue life posterior analysis model constitue the final model.•Several hyper-parameters of ridge classification and kernel ridge regression were investigated to validate the algorithms.