Andoko, Poppy Puspitasari
This research attempts to investigate the mechanical properties of nodular cast iron using new heat treatment technique. Novel two-step austempering technique was executed to obtain better mechanical properties for nodular cast iron. The results from this method were then compared to a conventional heat treatment, namely single-step austempering method. Single-step and two-step austempering methods were done at 900 °C of austenitic temperature for 60 minutes. For two-step austempering method, the second step started at 260 °C for 10 minutes increased gradually at 280, 310, and 340 °C for 60 minutes. The mechanical properties of nodular cast iron increased significantly using two-step austempering method compared to the conventional and single-step austempering methods. The highest tensile strength was obtained using two-step austempering method at 340 °C for 60 minutes followed by 310 °C and 280 °C. On the contrary, the toughness of nodular cast iron decreased at 340 °C. © 2006-2016 Asian Research Publishing Network (ARPN).
Mechanical Engineering Department, Engineering Faculty, Universitas Negeri Malang, Jl. Semarang, Malang East Java, Indonesia
