TY - JOUR A1 - Landesberger, Martin A1 - Koos, Robert A1 - Hofmann, Michael A1 - Li, Xiaohu A1 - Boll, Torben A1 - Petry, Winfried A1 - Volk, Wolfram T1 - Phase Transition Kinetics in Austempered Ductile Iron (ADI) with Regard to Mo Content JF - Materials N2 - 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. The delay of austenite decay during Stage II reaction caused by Mo was studied in detail at 400 °C for the initial material as well as for 0.25 mass % and 0.50 mass % Mo additions. UR - https://doi.org/10.3390/ma13225266 Y1 - 2020 UR - https://doi.org/10.3390/ma13225266 SN - 1996-1944 VL - 13 IS - 22 PB - MDPI CY - Basel ER - TY - JOUR A1 - Landesberger, Martin A1 - Koos, Robert A1 - Erber, Maximilian A1 - Pernumian, Matteo A1 - Masaggia, Stefano A1 - Hoelzel, Markus A1 - Volk, Wolfram T1 - Phase transition and microstructure investigation of perferritic isothermed ductile iron (IDI) JF - International Journal of Cast Metals Research UR - https://doi.org/10.1080/13640461.2020.1833477 Y1 - 2020 UR - https://doi.org/10.1080/13640461.2020.1833477 SN - 1364-0461 VL - 33 IS - 6 SP - 233 EP - 241 PB - Taylor & Francis CY - London ER -