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Characterization of dual phase steels by using magnetic barkhausen noise analysis
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Date
2006
Author
Kaplan, Mücahit
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The aim of this work is to nondestructively characterize the industrial dual phase (ferritic-martensitic) steels (DPS) by the Magnetic Barkhausen Noise (MBN) method. By quenching of AISI 8620 steel specimens having two different starting microstructures, from various intercritical annealing temperatures (ICAT) in the ferrite-austenite region, the microstructures consisting of different volume fractions of martensite and morphology have been obtained. The microstructures, strength properties and hardness values were determined by conventional metallographic and mechanical tests. The measurements of the Magnetic Barkhausen Noise (MBN) were performed by using both Rollscan and ́SCAN sensor connectors. A good correlation between the martensite volume fraction, hardness and MBN signal amplitude has been obtained. MBN emission decreased as the ICAT, therefore the volume fraction of martensite increased. Moreover, MBN emission decreased as the martensite morphology become thinner. It has been concluded that MBN method can be used for nondestructive characterization of industrial dual phase steels.
Subject Keywords
Metallurgy.
URI
http://etd.lib.metu.edu.tr/upload/12607604/index.pdf
https://hdl.handle.net/11511/16029
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Graduate School of Natural and Applied Sciences, Thesis
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M. Kaplan, “Characterization of dual phase steels by using magnetic barkhausen noise analysis,” M.S. - Master of Science, Middle East Technical University, 2006.
