Abstract
The present work discusses the influence of carbon content on the transformation behaviour of austenite in 9Cr-1Mo steels, employing conventional microscopic techniques. The two main themes of the present work were the role of carbon in altering the choice of decomposition mode of austenite during various rates of cooling and the influence of carbon on the variation of a number of microstructural parameters with solution treatment temperature. Based on these studies, microstructural maps have been proposed depicting the influence of carbon on the decomposition modes of austenite during cooling. The second section, namely, the variation in microstructural parameters with solutionising temperature, highlights the role of carbon in shifting the Tγ → Tδ temperature and the time-temperature-transformation diagram of γ → α + carbides.
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