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Carbon Redistribution Process in Austempered Ductile Iron (ADI) During Heat Treatment—APT and Synchrotron Diffraction Study

  • In-situ synchrotron diffraction and atom probe tomography (APT) have been used to study the carbon diffusion and redistribution process in austempered ductile iron (ADI) during austempering. The process of carbon content change in bainitic ferrite during different austempering temperatures has been determined quantitatively. The transformation in ADI is controlled by decarburization of supersaturated ferrite and carbide precipitation and has been found to be divided into three stages based on a model developed for bainitic steels by Takahashi and Bhadeshia. The formation, morphology and composition of carbides and carbon clusters in ferrite after austempering have been identified unequivocally by APT. Finally, the relationships of carbon content in ferrite, carbon gap values, and austempering temperatures in the ADI alloy were expressed using empirical equations.

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Metadaten
Author:Xiaohu LiORCiD, Julia N. Wagner, Andreas StarkORCiD, Robert Koos, Martin LandesbergerORCiD, Michael HofmannORCiD, Guohua Fan, Weimin GanORCiD, Winfried PetryORCiD
Language:English
Document Type:Article
Year of first Publication:2019
published in (English):Metals
Publisher:MDPI
Place of publication:Basel
ISSN:2075-4701
Volume:9
Issue:7
Pages:15
Article Number:789
Review:peer-review
Open Access:ja
Version:published
URN:urn:nbn:de:bvb:573-47775
Related Identifier:https://doi.org/10.3390/met9070789
Licence (German):License Logo Creative Commons BY 4.0
Release Date:2024/06/07