Prof. Dr. Olivera Adreja Eric Cekic

Austempered ductile iron (ADI) proved to be an advanced material as it possesses remarkable combination of high strength, ductility and toughness with good wear resistance and machinability. These properties can be achieved upon adequate heat treatment which yields optimum microstructure for a given chemical composition. In the present paper, an investigation has been conducted on unalloyed ADI and alloyed with 0·47%Cu and 1·6%Cu + 1·5%Ni, austempered at 350°C for the time up to the 6 h. The microstructure and fracture mode developed throughout these treatments have been studied by means of light, transmission and scanning electron microscopy, as well as X-ray diffraction. It was shown that the strength, elongation and impact energy strongly depend on amount of ausferritic ferrite and stable, high carbon enriched retained, reacted austenite. Based on the results, optimal processing windows for alloyed ductile irons used, have been established. In addition, for alloyed ADIs with maximum amount of reacted, retained austenite, transition temperature was also obtained.

3 February 2016 in International Journal of Cast Metals Research

Journal Article

Abrasive wear behaviour of ADI material with various retained austenite content

Sebastian Balos

Dragan Rajnovic

Miroslav Dramicanin

Danka Labus Zlatanovic

Olivera Adreja Eric Cekic

L. Sidjanin

In this paper, the wear rate of ferritic and pearlitic ductile iron, as well as three types of austempered ductile iron (ADI materials), austempered at 300, 350 and 400 °C is investigated. Two wear parameters were varied, wear load (0.5, 1.3, 2 kg) and grit paper abrasive grain size (P240, P500, P800). The hardness of ductile iron and stress-assisted phase transformation of retained austenite into martensite (SATRAM) phenomenon in ADI materials were found to play major roles in wear behaviour. The pronounced SATRAM phenomenon was detected for the most severe wear parameters. Another important factor in the occurrence of SATRAM phenomenon is the presence of metastable, low carbon-enriched retained austenite. As a consequence, the wear rate of ADI austempered at 400 °C is nearly equivalent to ADI austempered at 300 °C at medium and high loading with the coarsest abrasive paper grit tested (P240).

About Me

Dr Olivera Erić Cekić is an Associate Professor and at University of Kragujevac, Faculty of mechanical and civil engineering Kraljevo, Department of Applied mechanics and construction, Dositejeva 19, 36000 Kraljevo, Serbia. Prof. Erić Cekić graduated from the University of Belgrade, Faculty of Technology and Metallurgy at the University of Belgrade and received her Dipl. Eng. degree (BSc with honors, 5 year study program) in the field of Metallurgy and Materials Science in 1992. Professional employment: from graduation (1992) to June 2000, Dr Erić was employed at the Factory of castings and models in New Belgrade, in Department of research and development for the automotive industry. From July 2000 until August 2006, she was employed at the Laboratory for Materials, IHer field of interest is microstructural properties' relationships in both conventional engineering materials (ferrous and non-ferrous alloys) and advanced materials (ADI materials, composites) and the variety of characterization techniques (mechanical tests, wear tests, image analysis, SEM, and EDS) used for such investigations. She is a member of the European Microscopy Society.

Prof. Dr. Olivera Adreja Eric Cekic

Prof. Dr. Olivera Adreja Eric Cekic

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