Abstract
Trace C atoms can significantly alter the mechanical properties of steels, however, the effects of C atoms during precipitation of the Mn/Ni/Si-rich phases in reactor pressure vessel (RPV) steels remains unclear. Here, the interaction of C atoms with Mn/Ni/Si atoms during aging is investigated via the internal friction technique. Two Snoek peaks were detected: one is a superposition of the Snoek relaxation in Fe-C-Fe and the Snoek relaxation in Fe-C-Mn, and the other is the Snoek relaxation in Fe-C-Ni(Si). From the height variation of Snoek peaks with aging time, it was found that with the increasing aging time, the C atoms combine with the substitutional solute atoms at first, and then co-precipitate as MnSiC clusters at the GBs after 20 h aging at 600 °C. The variation of Snoek peak with aging time provides a reliable method to non-destructively detect the aggregation and precipitation of the M/Ni/Si-rich phases in RPV steels.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call