Abstract
The mechanical properties as well as microstructure of the ductile cast iron (DCI) are most likely affected by heat treatments. In this work, the mechanical properties of different heat treated of DCI alloy were investigated. Two heat treatment (HT) processes were conducted for DCI; austempering and quenching followed by lower tempering. The melted alloy of DCI was poured in Y-block, from which the specimens of the mechanical tests were prepared. Experimental tests were carried out to investigate the effect of these HT processes on the mechanical properties. A comparison between mechanical properties due to HT and as cast DCI are presented and discussed. The results showed that there is a difference in microstructure, homogeneity, wear rate and compression of DCI based on the conducted heat treatment.
Highlights
Ductile cast iron is one of the most important materials, which is used in many industrial and automobile applications
This kind of a matrix structure provides higher strength and ductility as compared to as-cast ductile cast iron, while after quenching followed by tempering (Q-T) heat treatment process, the entire matrix was transformed to martensitic structure as shown in Fig. 6 (c)
4 Conclusion Two heat treatment processes; austempering and quenching followed by tempering were conducted for ductile cast iron (DCI)
Summary
Ductile cast iron is one of the most important materials, which is used in many industrial and automobile applications. The effects of austempering, normalizing and annealing heat treatment processes on ductile iron specimen have been studied, in which various temperatures and holding times are adopted. Most of the published works adopt the austempered heat treatment as a method for enhancement of mechanical properties of DCI, while the quenching followed by tempering (Q-T) heat treatment compared with other heat treatment processes was overlocked to investigate the mechanical properties of DCI. This is the motivation of this research. The effect of two HT on DCI were presented and discussed in details
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