Evolution of microstructure and changes of mechanical properties of CLAM steel after long-term aging

Xue Hu, Lixin Huang, Wei Yan, Wei Wang, Wei Sha, Yiyin Shan, Ke Yang

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    37 Citations (Scopus)

    Abstract

    The China Low Activation Martensitic (CLAM) steel has been developed as a candidate structural material for future fusion reactors. It is essential to investigate the evolution of microstructure and changes of mechanical properties of CLAM steel during thermal exposure. In this study, the long-term thermal aging of the CLAM steel has been carried out in air at 600 °C and 650 °C for 1100 h, 3000 h and 5000 h. The microstructural evolution with aging time was studied, including characteristics of the growth of M23C6 carbides and the formation of Laves-phase precipitates as well as the evolved subgrains. The microstructural evolution leads to the changes of mechanical properties of the CLAM steel. The Ductile–Brittle Transition Temperature (DBTT) increases significantly during the thermal aging, which is related to the formation of Laves-phase in the steel matrix. The possible mechanism of stabilizing microstructure during the thermal exposure has been analyzed based on the interaction between M23C6 carbides and subgrain boundaries.
    Original languageEnglish
    Pages (from-to)253–258
    Number of pages6
    JournalMaterials Science and Engineering A
    Volume586
    Early online date19 Aug 2013
    DOIs
    Publication statusPublished - 01 Dec 2013

    Keywords

    • Steel
    • Aging
    • Mechanical characterization
    • Electron microscopy
    • Light microscopy
    • Microanalysis

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