Ms. Bulan Abdullah Profile

Bulan Abdullah

at Univ Teknologi MARA

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Proceedings Article | 15 April 2010 Paper

Study of mechanical, physical, and corrosion behavior of 0.5% cobalt alloyed austempered ductile iron

Bulan Abdullah, Ahmed Jaffar, Siti Khadijah Alias, Abdullah Ramli, Mohd Faizul Izham

Proceedings Volume 7522, 752240 (2010) https://doi.org/10.1117/12.851606

KEYWORDS: Iron, Corrosion, Cobalt, Heat treatments, Polarization, Analytical research, Chemical elements, Carbon dioxide, Annealing, Nickel

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Objectives: The purpose of this research was to determine the mechanical properties and corrosion behavior of 0.5% Co-DI before and after heat treatment and compare with commercial ductile iron. Methods: Molten metal of newly developed ductile iron which alloyed with 0.5% Cobalt produced through CO2 sand casting method. The specimens then performed preheat to 500°C in an hour then oil quenched. Specimens then performed annealing to 900°C in half an hour before oil quenched again. 500°C, 600°C and 700°C austempering temperature had been selected subjected to the specimens in half an hour before cooled to room temperature. The tests involved are microstructure analysis which included nodule count and phase analysis, polarization test, spectrometer test, density test, tensile test (ASTM E 8M), hardness test and impact test (ASTM A327) on as cast and austempered specimen. Results: 0.5% Cobalt alloyed austempered ductile iron with 500°C austempered temperature is the optimum temperature for 0.5% Co-ADI. It's not only increase the nodule count in the content, but also improve the mechanical properties such as impact toughness and tensile strength. Corrosion rate of 0.5% Co-DI also improved compare to unalloyed DI.

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