Abstract
In this research, the effect of semi-solid isothermal heat treatment on microstructure, hardness and impact toughness of ductile iron (DI) is studied. Heat-treated air-cooled ductile iron shows spheroid graphite, cementite and fine pearlite matrix structure. At the early stages of heating time (up to 20 min), the DIs show significant decrease in amounts of graphite and significant increase in amounts of cementite. By increasing heating time, above 20 min, the DIs show slightly decrease in amounts of graphite and slightly increase in amounts of cementite. Hardness values increase by increasing heating time. Meanwhile, the impact toughness decrease with increasing heating time. The optimum heating treatment condition for reasonable structure and mechanical properties could be achieved at the temperature of 1165℃ for the heating time range of 10 to 15 min.
Highlights
Ductile irons are very unique engineering materials
The effect of reheating temperatures on the microstructures of ductile iron (DI) at the optimum reheating time has been reported in the literature [10] where, optimum reheating condition of spherical and the rounded primary solid was attained at the temperature of 1165 ̊C for 15 min
Investigations carried out to study the influence of semisolid isothermal heat treatment on microstructure of ductile iron and mechanical properties lead to the following conclusions: 1) Heat treated air cooled ductile iron shows spheroid graphite, cementite and fine pearlite matrix structure
Summary
Ductile irons are very unique engineering materials They possess good castability, damping capacity and mechanical properties and fair machinability. Owing to these advantages, ductile irons have been used in many structural applications. There are currently a plenty of new and advanced materials, cast irons are still the most used casting alloy for its considerable reduction in their cost of production. Their popularity stems from an ability to cast complex shapes at relatively low cost and the wide range of properties that can be achieved by careful control over composition and cooling rate [5,6]
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