Härte- und Eigenspannungsmessungen an Niederdruckturbinenschaufeln

Flame hardended leading edges of low pressure turbine blades are sensitive to water droplet erosion. In order to preclude stress corrosion cracking in the area residual stresses must be avoided. To control the actual residual stress and hardness value Barkhausen noise parameters as the Barkhausen noise amplitude and coercivity, are measured. The method is now applied for service inspection in power plants and production control.