Corrosion behavior of AlCrFeTiNb and AlCrFeTiNb/(AlCrFeTiNb)N coatings in flowing lead–bismuth eutectic alloy with saturated oxygen concentration at 550 ℃

•The AlCrFeTiNb monolayer and AlCrFeTiNb/(AlCrFeTiNb)N multilayer coatings were specially designed for LBE-cooled fast reactors.•For the AlCrFeTiNb coatings, increasing the coating thickness will increase the LBE oxidation corrosion rate and stress corrosion-induced crack density.•For the AlCrFeTiNb/(AlCrFeTiNb)N coatings, increasing the interlayer interface density, appropriately, can simultaneously improve the LBE erosion resistance and crack propagation resistance.