Effect of pre-hot salt corrosion on hot salt corrosion fatigue behavior of the TC11 titanium alloy at 500 °C

•The fatigue life decreases greatly with the increase of salt deposition.•The HSCF sensitivity of the TC11 alloy at 500 °C was further increased by PHSC.•Combined effect of cyclic stress and salt broken the protective layer of TiO2.•Local stress concentration of pits accelerated the initiation of fatigue cracks.•Hydrogen and the hydride phase promoted fatigue crack propagation.