Corrosion fatigue crack initiation in 12% chromium stainless steel

Characteristics of corrosion fatigue failures of steam turbine blades derived from failure analysis are summarized. Then corrosion fatigue variables on corrosion fatigue strength of 12% chromium stainless steel are briefly reviewed. The paper emphasizes initiation and growth of corrosion pits in the corrosion fatigue crack initiation process. A recent investigation of the early stages of corrosion pit initiation by use of electrochemical noise measurement is demonstrated. Finally, some recommendations are given how to clarify the corrosion fatigue crack initiation process.