Industrial Applications of 3MA – Micromagnetic Multiparameter Microstructure and Stress Analysis

Abstract

Micromagnetic NDT techniques like the measurement of the magnetic Barkhausen noise, the incremental permeability and the harmonic analysis of the tangential magnetic field allow deriving inspection procedures to online monitoring and control machinery pa rts and components in production processes in order to characterize mechanical properties like hardne ss, hardening depth, yield and tensile strength. These types of inspection procedures continuously were furt her developed in the last two decades so that today the second generation of system hard and software is in industrial use. The application is in steel industry where steel sheets in hot-dip-galvanizing lines w ere annealed after cold rolling but also in heavy plate rolling mills where after thermo-mechanical rolli ng special textures and texture gradients can occur. An increasing number of applications are also to find in t he machinery building industry and here especially in case of machinery parts of the car supplyi ng industry. Besides mechanical hardness determination the measurement of residual stresses and the detection of in-homogeneities in the surface of machined parts is an inspection task. In different case studies the advantage to implement a micromagnetic NDE technique into the industrial processes is discussed.