Metalurgija, Vol. 65 No. 2, 2026.
Izvorni znanstveni članak
https://doi.org/10.64486/m.65.2.4
Multi Response Modelling and Optimisation of Austempering Parameters on ADI Microstructure, Hardness and Fatigue Strength
Nikša Čatipović
orcid.org/0000-0002-5031-0766
; Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split, Ruđera Boškovića 32, 21000 Split, Croatia
*
Ivan Peko
orcid.org/0000-0001-5048-9842
; Faculty of Science, University of Split, Ruđera Boškovića 33, 21000 Split, Croatia
Jure Krolo
orcid.org/0000-0002-3204-0344
; Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split, Ruđera Boškovića 32, 21000 Split
Jelena Čulić-Viskota
; Independent Researcher
Andrej Razumić
; Department of Polytechnics, Dr. Franjo Tuđman Defense and Security University, Ilica 256b, Zagreb, Croatia
* Dopisni autor.
Sažetak
In this work, the influence of austempering temperature and time on the microstructure, hardness and fatigue strength of austempered ductile iron (ADI) is investigated. The experimental part was carried out on a total of eleven samples, nine of which were subjected to heat treatment at three temperatures (250 °C, 350 °C and 450 °C) and three time intervals (30 min, 75 min and 120 min). The tests included measurements of the fatigue strength, Vickers hardness and a microstructural analysis. The aim was to determine the optimum austempering parameters to achieve an ausferritic microstructure and improved mechanical properties. The results showed that austempering temperature had a significant effect on the properties of the treated samples, while austempering time did not show consistent statistical significance, although some samples deviated positively from the statistical model. The best result was obtained with the sample austempered at 350 °C for 120 minutes. Metallographic analysis confirmed the presence of an ausferritic microstructure, which contributed to the improved mechanical properties. The research highlights the importance of properly selecting austempering parameters to achieve an optimal combination of hardness and fatigue strength. Measured values were used to develop mathematical models which can be applied to predict analysed properties of ADI depending on austempering parameters.
Ključne riječi
ADI; austempering parameters; hardness; fatigue; microstructural analysis; modelling
Hrčak ID:
343668
URI
Datum izdavanja:
1.4.2026.
Posjeta: 299 *