Table of Contents
Journal of Metallurgy
Volume 2015 (2015), Article ID 931535, 11 pages
http://dx.doi.org/10.1155/2015/931535
Research Article

Effect of Processing Parameters on the Mechanical Properties of Heavy Section Ductile Iron

Central Metallurgical Research and Development Institute, P.O. Box 87, Helwan, Cairo, Egypt

Received 10 September 2014; Accepted 2 January 2015

Academic Editor: Brij Kumar Dhindaw

Copyright © 2015 Mohamed Mahmoud Mourad et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The main objective of the current work is to investigate the influence of different inoculation conditions on the microstructure and mechanical properties of heavy section ductile iron (DI) castings. Inoculation treatment was done via one step and double step treatments with different amounts of inoculants. The mechanical properties of the fabricated samples were evaluated. The best inoculation procedure in terms of graphite nodules characteristics and mechanical properties was double inoculation with 0.8% inoculants added at first and 0.2% in the late inoculation step. The presence of Sb in one of the cast alloys controlled the growth of graphite nodules in these heavy section ductile iron castings; however low impact toughness was recorded. The matrix structure of ductile cast iron showed a significant influence not only on the strength and impact properties but also on the fracture mode during testing.