Determination of Residual Stresses Using Micromagnetic Parameters

All ferromagnetic NDE methods are sensitive to the mechanical stress- and microstructure state of the tested material. Therefore, residual stress measurements can only be made if the influence of microstructure can be separated by using two or three independent measuring quantities. Specimens with different microstructure- and residual stress states are tested by X-ray-, hardness-, Barkhausen noise-, and incremental permeability measuring devices. The state of development is demonstrated.