Title :
Modeling microstructural effects on Barkhausen effect signals in surface-modified magnetic materials
Author :
Kinser, E.R. ; Lo, C.C.H. ; Barsic, A.J. ; Jiles, D.C.
Author_Institution :
Center for Nondestructive Evaluation, Iowa State Univ., Ames, IA, USA
Abstract :
The relationships between the Barkhausen effect (BE) model parameters and the microstructure of a series of steel samples with various dislocation densities were examined. The steel samples were obtained from an induction-hardened steel rod at different depths. Results indicate that the BE model parameters are inversely proportional to the pinning coefficient k which characterizes the domain wall pinning strength and is dependent on dislocation density. The domain wall pinning strength was determined by simulating the measured hysteresis loops using the energetic hysteresis model.
Keywords :
Barkhausen effect; crystal microstructure; dislocation density; magnetic domain walls; magnetic hysteresis; magnetic materials; steel; Barkhausen effect signals; dislocation densities; domain wall pinning strength; energetic hysteresis model; hysteresis loops; induction-hardened steel rod; microstructural effects; pinning coefficient; surface-modified magnetic materials; Coercive force; Density measurement; Fluctuations; Grain size; Magnetic hysteresis; Magnetic materials; Microstructure; Particle measurements; Signal processing; Steel;
Conference_Titel :
Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International
Print_ISBN :
0-7803-9009-1
DOI :
10.1109/INTMAG.2005.1463701