Synopsis : Variousmethodswereemployedtomeasuretheaustenitevolumefractionina1.5Mn-1.5Si-0.2Csteel.Ithasbeenconfirmedthatthevolume fractions determined by transmission electron microscopy, scanning electron microscopy/electron back scatter diffraction, X-ray diffraction and neutron diffraction exhibit a general trend to become larger in this order, although the values obtained by X-ray and neutron diffraction are similar in the present steel because austenite is relatively stable. The austenite volume fractions determined by diffraction methods have been found to be affected by the measuring specimen direction, i.e., texture, even by applying the conventional correcting procedure. To avoid thisinfluence,itisrecommendedtomeasurebothofvolumefractionandtexturesimultaneouslyusingneutrondiffraction.Althoughsyn-chrotronX-rayshowshigherangleresolution,itssmallincidentbeamsizebringspoorstatisticreliability.Theinfluenceoftexturecannotbe avoided for transmission Bragg edge measurement, either, which must be overcome to realize 2D or 3D volume fraction mapping.
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