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Phase transition kinetics in austempered ductile iron (ADI) with regard to MO content

Landesberger, M.; Koos, R.; Hofmann, M.; Li, X.; Boll, Torben; Petry, W.; Volk, W.

Abstract:
The phase transformation to ausferrite during austempered ductile iron (ADI) heat treatment can be significantly influenced by the alloying element Mo. Utilizing neutron diffraction, the phase transformation from austenite to ausferrite was monitored in-situ during the heat treatment. In addition to the phase volume fractions, the carbon enrichment of retained austenite was investigated. The results from neutron diffraction were compared to the macroscopic length change from dilatometer measurements. They show that the dilatometer data are only of limited use for the investigation of ausferrite formation. However, they allow deriving the time of maximum carbon accumulation in the retained austenite. In addition, the transformation of austenite during ausferritization was investigated using metallographic methods. Finally, the distribution of the alloying elements in the vicinity of the austenite/ferrite interface zone was shown by atom probe tomography (APT) measurements. C and Mn were enriched within the interface, while Si concentration was reduced. The Mo concentration in ferrite, interface and austentite stayed at the same level. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000127663
Veröffentlicht am 14.12.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Werkstoffkunde (IAM-WK)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1996-1944
KITopen-ID: 1000127663
Erschienen in Materials
Verlag MDPI
Band 13
Heft 22
Seiten Art.-Nr.: 5266
Schlagwörter 018-019-021509 APT FIB; ADI; phase transition kinetics; retained austenite; molybdenum; atom probe tomography; neutron diffraction; dilatometry
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