Relationship between Laves phase and the impact brittleness of P92 steel reevaluated

Wanli Zhong, Wei Wang, Xu Yang, Wensheng Li, Wei Yan, Wei Sha, Wei Wang, Yiyin Shan, Ke Yang

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    Abstract

    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.
    Original languageEnglish
    Pages (from-to)252–258
    Number of pages7
    JournalMaterials Science and Engineering A
    Volume639
    Early online date14 May 2015
    DOIs
    Publication statusPublished - 15 Jul 2015

    Keywords

    • Steel
    • Precipitation
    • Fracture
    • Mechanical characterization
    • Electron microscopy
    • Phase transformation

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