Laves phase has been widely accepted to cause the impact brittleness of 9–12Cr martensitic heat-resistant steels after long time aging at elevated temperatures. However, in the present research, the impact toughness of the already brittle P92 steel aged at 600 °C for 2035 h could be restored to the original level by reheating at 700 °C for 1 h, with Laves phase barely changed. This interesting result strongly indicated that the presence of Laves phase might not be the real reason for the impact brittleness.
- Mechanical characterization
- Electron microscopy
- Phase transformation
Zhong, W., Wang, W., Yang, X., Li, W., Yan, W., Sha, W., Wang, W., Shan, Y., & Yang, K. (2015). Relationship between Laves phase and the impact brittleness of P92 steel reevaluated. Materials Science and Engineering A, 639, 252–258. https://doi.org/10.1016/j.msea.2015.05.012