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Monitoring the Microstructural Evolution in Spheroidized Steels by Magnetic Barkhausen Noise Measurements

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Abstract

The aim of this study is to monitor nondestructively the degree of spheroidization in steels by Magnetic Barkhausen Noise (MBN) method. Various series of specimens consisting of either lamellar pearlite or partially/completely spheroidized carbides were produced from AISI 1060 steel by appropriate heat treatments. All specimens were characterized by metallographic examinations, hardness and MBN measurements. The results show that MBN signals are very sensitive to the variations in the microstructure caused by the spheroidizing heat treatment. The change of microstructure, from coarse lamellar carbides to uniformly dispersed spherical carbides in ferrite matrix, is reflected as higher Barkhausen activity due to less effective pinning of domain walls.

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Authors and Affiliations

  1. Department of Microstructure Physics and Metal Forming, Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, Germany

    Kemal Davut

  2. Metallurgical and Materials Engineering Department, Middle East Technical University, Ankara, Turkey

    C. Hakan Gür

Authors
  1. Kemal Davut
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  2. C. Hakan Gür
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Correspondence to C. Hakan Gür.

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Davut, K., Gür, C.H. Monitoring the Microstructural Evolution in Spheroidized Steels by Magnetic Barkhausen Noise Measurements. J Nondestruct Eval 29, 241–247 (2010). https://doi.org/10.1007/s10921-010-0082-4

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  • DOI: https://doi.org/10.1007/s10921-010-0082-4

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