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    Some characteristics of thermally induced martensite in Fe-30%Ni-3.6%Mo alloy
    (2008) Yaşar, Erdem; Güler, Emre; Güngüneş, Hakan; Durlu, Tahsin Nuri
    Kinetical, morphological and magnetic characteristics of thermally induced martensite in an Fe-30%Ni-3.6%Mo alloy has been studied by scanning electron microscopy, transmission electron microscopy and Mössbauer spectroscopy. Scanning electron microscope and transmission electron microscope observations revealed the occurrence of both athermal and isothermal martensitic transformation in the alloy. In addition, the magnetic properties of both the austenite and martensite phases were determined by the Mössbauer spectroscopy. The Mössbauer spectra showed a paramagnetic character for the austenite phase and an antiferromagnetic character for the martensite phase. © 2007 Elsevier Inc. All rights reserved.
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    Öğe
    The effect of austenitizing time on martensite morphologies and magnetic properties of martensite in Fe-24.5%Ni-4.5%Si alloy
    (2007) Güngüneş, Hakan; Yaşar, Erdem; Durlu, Tahsin Nuri
    The effect of austenitizing time on the formation of martensite in Fe-24.5%Ni-4.5%Si alloy has been studied by means of transmission electronmicroscope (TEM), scanning electronmicroscope (SEM) and Mössbauer spectroscopy technique. TEM and SEM observations revealed that the martensite morphology was found to be closely dependent on the austenitizing time. The orientation relationship between austenite and thermally induced martensite was found as the Kurdjumov-Sachs type. The volume fraction changes of martensite and austenite phases, the hyperfine magnetic field of martensite phase and isomery shift values have been determined by Mössbauer spectroscopy. The Mössbauer study also revealed that the martensite volume fractions increased with increasing austenite grain size. © Springer Science+Business Media, LLC 2007.