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S. Dépinoy, C. Toffolon-Masclet, A. Gourgues-Lorenzon, E. Kozeschnik, B. Marini, F. Roch:
"Experimental determination and modeling of carbide precipitation sequences in a 2.25Cr - 1Mo bainitic steel during tempering";
Talk: TMS 2015, Orlando, Florida; 2015-05-15 - 2015-05-19.

Carbide precipitation during tempering is a key parameter for the industrial application of 2.25Cr - 1Mo steels. The size and nature of these precipitates directly influence mechanical properties at operating temperatures and the brittle-to-fracture transition temperature range. Thus the prediction of carbide precipitation sequences in 2.25Cr - 1Mo steel is of considerable interest for industrial applications. This work focuses on the precipitation sequence during tempering between 625°C and 725°C. Experimental determination of the nature, morphology, size and spatial distributions of carbides has been made using TEM observations of carbon extraction replicas for a variety of tempering conditions. Computational simulations of the precipitation and evolution of carbides in bainite has been conducted using the multi-component precipitation kinetics module of the MatCalc software as a function of tempering parameters. Experimental results and model predictions are then compared and discussed.