Print Email Facebook Twitter High-resolution characterization of the martensite-austenite constituent in a carbide-free bainitic steel Title High-resolution characterization of the martensite-austenite constituent in a carbide-free bainitic steel Author Hofer, Christina (Montan University of Leoben) Bliznuk, Vitaliy (Universiteit Gent) Verdiere, An (Universiteit Gent) Petrov, R.H. (TU Delft (OLD) MSE-3; Universiteit Gent) Winkelhofer, Florian (Voestalpine Stahl GmbH) Clemens, Helmut (Montan University of Leoben) Primig, Sophie (Montan University of Leoben; University of New South Wales) Date 2018 Abstract The multiphase microstructure of carbide-free bainitic steels comprises bainitic ferrite laths, retained austenite with different morphologies, a minor fraction of carbides and so-called martensite-austenite areas, which partially transform during the last cooling step. While the other constituent received much attention, little is known about the structure of the martensite-austenite constituent in carbide-free bainitic steels. Thus, in this study, it was structurally and chemically investigated by high-resolution techniques such as transmission electron microscopy and atom probe tomography after preceded unambiguous identification by electron backscatter diffraction in conventional as well as transmission mode. The results, ranging from carbon segregation to cementite precipitation in the martensitic part, indicate strong auto-tempering during final cooling which is followed by aging. Also, some kind of structural modulation in the austenite belonging to the martensite-austenite areas was observed. Atom probe tomography revealed a heterogeneous carbon distribution, further supporting the findings by transmission electron microscopy. Subject Atom probe tomographyCarbide-free bainiteMartensite-austenite constituentStructural modulationTransmission electron microscopy To reference this document use: http://resolver.tudelft.nl/uuid:4fcb3989-184b-4c65-a65c-53cd26d6f31c DOI https://doi.org/10.1016/j.matchar.2018.07.011 Embargo date 2020-07-17 ISSN 1044-5803 Source Materials Characterization, 144, 182-190 Bibliographical note Accepted Author Manuscript Part of collection Institutional Repository Document type journal article Rights © 2018 Christina Hofer, Vitaliy Bliznuk, An Verdiere, R.H. Petrov, Florian Winkelhofer, Helmut Clemens, Sophie Primig Files PDF Hofer_Petrov_Manuscript.pdf 10.35 MB Close viewer /islandora/object/uuid:4fcb3989-184b-4c65-a65c-53cd26d6f31c/datastream/OBJ/view