Effect of Alloy Composition and Inoculation on Microstructure and Cracking Susceptibility of Aluminum Cast Irons

摘要

The present investigation was conducted on aluminum cast irons having aluminum in the range of 5-25/100 Al. The broad objectives of the investigation were 1) optimization of alloy composition and inoculation practice for the production of as-cast spheroi- dal/compacted graphite irons, free from chill, and 2) determina- tion of microstructural characteristics of aluminum cast iron (5-25/100Al). An alloy approximately 5Al-3.5C-2.5Si composition de- veloped almost fully nodular graphite structure, free from eutec- tit carbide, after treatment with O.1/100 mischmetal and postin- oculation with 1/100 calcium silicide.