Analysis on Cracking Reasons of 2Cr13 Steel Turbine Blades

Cracking often happened to last-stage blades of low-pressure turbine rotors due to the alternating stress during the process of starting, stopping and changing of working parameters in power plants, which threatened the safe operation of turbines. The cracking turbine blade was analyzed to make sure the cracking reasons by metallographic examination, hardness testing, fracture analysis and energy spectrum analysis. The results show that:the material of the cracking blade was qualified, and the cracking reason was the corrosion fatigue caused by the combined action of corrosion environment and alternating stress.