Similarity between Effects of Laves Phase and M6C in Alloy Steels
Similarity between Effects of Laves Phase and M6C in Alloy Steels

Summary/Abstract: The aim of this work is to summarize the experimental result obtained within the last two decades about the effects of Laves phase and M6C during long-term thermal exposures of alloy steels. The intergranular Laves phase (12CrMoV steel) and/or M6C (3CrMoV steel) particles were found to evoke the anomaly in the kinetic dependence of phosphorus grain boundary concentration. In comparison to other phases usually present in Cr-Mo alloy steels, Laves phase and M6C precipitate after longer periods of annealing and dissolve non-metallic elements such as phosphorus or silicon. A partitioning of originally segregated phosphorus between the matrix and the newly precipitated Laves phase and/or M6C particles led to the decrease in the phosphorus grain boundary concentration.

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