Austempering kinetic measurements are reported for a compacted graphite iron of composition Fe-3.4C-3.5Si-0.25Mn- 0.5Mo-0.5Ni (wt-%) for an austempering temperature of 375°C and austenitising temperatures of 890, 900, and 940°C. The measurements show that increasing the Si content accelerates the stage I reaction and delays the stage II reaction. An explanation is offeredfor the previous suggestions that increasing the Si content delays the stage I reaction.
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