Aerospace engineering 1 Alloy steel 1 Corrosion 1 Corrosion behaviour 1 Corrosion rate 1 Corrosion resistance 1 Failure (mechanical) 1 Gaseous nitriding 1 Hardening 1 Hardness 1 Immersion testing 1 Machinery 1 Maintenance cost 1 Mechanical failures 1 Nitriding 1 Nitrogen 1 Pitting 1 Root cause of failures Safety engineering 1 Steel metallurgy 1 Surface hardening 1 Surface hardness 1 Surface treatment 1