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Volume 25 Issue 8
Aug.  2018
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文章导航 >  矿物冶金与材料学报（英文）  > 2018  >  25(8): 913-921
Yan-ping Zeng, Jin-dou Jia, Wen-he Cai, Shu-qing Dong, and Zhi-chun Wang, Effect of long-term service on the precipitates in P92 steel, Int. J. Miner. Metall. Mater., 25(2018), No. 8, pp. 913-921. https://doi.org/10.1007/s12613-018-1640-5
Cite this article as:
Yan-ping Zeng, Jin-dou Jia, Wen-he Cai, Shu-qing Dong, and Zhi-chun Wang, Effect of long-term service on the precipitates in P92 steel, Int. J. Miner. Metall. Mater., 25(2018), No. 8, pp. 913-921. https://doi.org/10.1007/s12613-018-1640-5
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研究论文

Effect of long-term service on the precipitates in P92 steel

  • School of Materials Science and Engineering; University of Science and Technology Beijing, Beijing 100083, China

  • North China Electric Power Research Institute Co., Ltd., Beijing 100045, China

  • 通讯作者:

    Yan-ping Zeng    E-mail: zengyanping@mater.ustb.edu.cn

  • The precipitates in P92 steel after long-term service in an ultra-supercritical unit were investigated by field-emission scanning electron microscopy and transmission electron microscopy and were found to mainly consist of M23C6 carbides, Laves phase, and MX carbonitrides. No Z-phase was observed. M23C6 carbides and Laves phase were found not only on prior austenite grain boundaries, martensite lath boundaries, and subgrain boundaries but also in lath interiors, where two types of MX carbonitrides—Nb-rich and V-rich particles—were also observed but the “winged” complexes were hardly found. Each kind of precipitate within the martensite laths exhibited multifarious morphologies, suggesting that a morphological change of precipitates occurred during long-term service. The M23C6 carbides and Laves phase coarsened substantially, and the latter grew faster than the former. However, MX carbonitrides exhibited a relatively low coarsening rate. The effect of the evolution of the precipitate phases on the creep rupture strength of P92 steel was discussed.
    • Research Article

    Effect of long-term service on the precipitates in P92 steel

    + Author Affiliations
      Abstract
    • The precipitates in P92 steel after long-term service in an ultra-supercritical unit were investigated by field-emission scanning electron microscopy and transmission electron microscopy and were found to mainly consist of M23C6 carbides, Laves phase, and MX carbonitrides. No Z-phase was observed. M23C6 carbides and Laves phase were found not only on prior austenite grain boundaries, martensite lath boundaries, and subgrain boundaries but also in lath interiors, where two types of MX carbonitrides—Nb-rich and V-rich particles—were also observed but the “winged” complexes were hardly found. Each kind of precipitate within the martensite laths exhibited multifarious morphologies, suggesting that a morphological change of precipitates occurred during long-term service. The M23C6 carbides and Laves phase coarsened substantially, and the latter grew faster than the former. However, MX carbonitrides exhibited a relatively low coarsening rate. The effect of the evolution of the precipitate phases on the creep rupture strength of P92 steel was discussed.
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