Abstract
The desired properties of cast irons for any particular application can be achieved by development of suitable combination of microstructural phases. These microstructural features are possible to be developed by solid state phase transformation using proper heat treatments. The commonly employed heat treatment processes such as annealing, normalizing, hardening and tempering, austempering and surface treatment produce microstructural features with desired properties. Unalloyed and low alloyed cast irons are widely employed as an economic structural material. The development of microstructures in different types of unalloyed and low-alloyed cast adopting several types of heat treatment and their corresponding mechanical, wear and corrosion properties are presented. Microstructural developments of common categories of unalloyed and low alloyed cast irons like flake graphite iron, malleable iron and ductile irons are presented in different sections.
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