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PREDICTION OF HARDENABILITY OF S.G. IRONS
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The advent of ductile iron has given a boost to the design engineers. Initially it was considered as a wonder metal in the field of metallurgy of cast irons. During few decades it was challenge to make ferritic grade ductile iron in as-cast condition for applications like wind mill and other large castings.
With further developments higher grades of ductile iron such as 500/7, 600/5, 700/3, 800/2, 900/ 2 are being produced requiring strict control over microstructure and subsequent hardening and tempering heat treatments. The production of these grades involves two steps, viz., consistent control over microstructure such as nodularity, nodule count and matrix structure and controlled heat treatment cycle parameters to achieve optimum mechanical properties including machinability of castings.
Source: S. K. Paknikar
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