Study of The Influence of Ladle Holding Time To The Impact Resistance, Hardness, and Microstructure of Nodular Cast Iron FCD 700

• Main Author: Adib Hasani NIM : 13713052, Muhammad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/29104
• Institution: Institut Teknologi Bandung

Nodular cast iron is one classification of cast iron which in the casting process, <br /> <br /> nodulizers was added on molten metal, so that the graphite structure will be <br /> <br /> nodular. The nodular shape of the graphite structure results in good combination <br /> <br /> of hardness and ductility in cast iron. In this study, 3 variations of ladle holding <br /> <br /> time were applied during the FCD700 nodular cast iron casting process i.e. 107 s, <br /> <br /> 304 s, and 500 s. The existence of such time variation will affect the remaining <br /> <br /> Mg content contained in the cast iron so that the number and roundness of <br /> <br /> graphite will vary as well. From these parameters, the impact and hardness test is <br /> <br /> performed on the sample to determine the consistency of nodular cast iron <br /> <br /> mechanical properties. The characterization is also conducted by metallography <br /> <br /> and heat tinting. In addition, annealing process was performed on samples at <br /> <br /> 7040C for 12 hours to observe the microstructure transformation phenomenon <br /> <br /> that occurred. The annealing process resulted in matrix transformation of the <br /> <br /> sample from pearlitic to ferritic. The results obtained from this study showed that <br /> <br /> the impact resistance difference and hardness difference on samples for each <br /> <br /> parameter is not statistically significant, with probability from F value obtained <br /> <br /> from ANOVA table is greater than 5%. This demonstrates that the difference in <br /> <br /> ladle holding time up to 500 seconds will not affect the consistency of the <br /> <br /> mechanical properties of FCD700 Nodular Cast Iron