MONITORING OF ANNEALED STEEL BEHAVIOR BY A MAGNETIC NDE SENSOR

Steel is one of the most widely used engineering materials for several applications. Steels properties are linked to chemical compositions, processing route and subsequent microstructure. Microstructural features, like, grain size, phase balance, particle size, play dynamic roles to control steel properties. Therefore, microstructure monitoring is prerequisite for achieving desired properties for a specific application. Due to technical complicacy of conventional characterization methods, magnetic Non- destructive Evaluation (NDE) methods are implementing as emerging tools for offline and online monitoring of steel behavior. In this research, the annealing treatment is carried out for 50 and 80% cold rolled ULC steels at temperature range from 200-690°C for offline monitoring their recovery and recrystallization behaviors. The microscopy analysis done by SEM-EBSD method, correlating to hardness and soft magnetic properties as a function of annealing treatment.