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Open AccessArticle

Effects of Alloying Elements (Mo, Ni, and Cu) on the Austemperability of GGG-60 Ductile Cast Iron

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Department of Metallurgical and Materials Engineering, Atılım University, Ankara 06830, Turkey
2
Ay Döküm Machine Industry and Trade Inc., Ankara 06930, Turkey
*
Author to whom correspondence should be addressed.
Metals 2017, 7(8), 320; https://doi.org/10.3390/met7080320
Received: 22 June 2017 / Revised: 11 August 2017 / Accepted: 15 August 2017 / Published: 22 August 2017
(This article belongs to the Special Issue Selected Papers from the 3rd International Iron and Steel Symposium)
The interest in austempered ductile irons (ADI) is continuously increasing due to their various advantageous properties over conventional ductile irons and some steels. This study aimed to determine the roles of alloying elements Ni, Cu, and Mo, on the austemperability of GGG-60 ductile cast iron. Two different sets of GGG-60 (EN-GJS-600-3) samples, one set alloyed with Ni and Cu and the other set alloyed with Mo, Ni, and Cu, were subjected to austempering treatments at 290 °C, 320 °C, and 350 °C. A custom design heat treatment setup, consisting of two units with the top unit (furnace) serving for austenitizing and the 200 L capacity bottom unit (stirred NaNO2-KNO3 salt bath) serving for isothermal treatment, was used for the experiments. It was found that austempering treatment at 290 °C increased the hardness of the Ni-Cu alloyed GGG-60 sample by about 44% without causing a loss in its ductility. In the case of the Mo-Ni-Cu alloyed sample, the increase in hardness due to austempering reached to almost 80% at the same temperature while some ductility was lost. Here, the microstructural investigation and mechanical testing results of the austempered samples are presented and the role of alloying elements (Mo, Ni, and Cu) on the austemperability of GGG-60 is discussed. View Full-Text
Keywords: ADI; austempering; molybdenum; nickel; copper; alloying; GGG-60; cast iron ADI; austempering; molybdenum; nickel; copper; alloying; GGG-60; cast iron
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Konca, E.; Tur, K.; Koç, E. Effects of Alloying Elements (Mo, Ni, and Cu) on the Austemperability of GGG-60 Ductile Cast Iron. Metals 2017, 7, 320.

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