Abstract
The behavior of substitutional alloying elements during and after the growth of upper bainite in Fe-Mn-Si-C and Fe-Mn-Si-C-Mo alloy steels has been examined using an atomic resolution microanalysis technique. From the results obtained, and judging from published data, it is concluded that manganese, nickel, silicon, chromium, and molybdenum do not redistribute during the growth of bainitic ferrite. Their concentrations are found to be uniform both at and in the vicinity of the transformation interface, with no indications of any segregation to the transformation interface during growth. However, prolonged annealing at the isothermal transformation temperature, after the formation of bainite has stopped, eventually stimulates the partitioning of substitutional alloying elements as the system tends toward equilibrium. The results demonstrate the existence of an atomic correspondence between the parent and product phases during transformation, the effect of substitutional alloying additions being manifestedvia a modification of the driving force for transformation.
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