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

Yan-ping Zeng; Jin-dou Jia; Wen-he Cai; Shu-qing Dong; Zhi-chun Wang

doi:10.1007/s12613-018-1640-5

Volume 25 Issue 8

Aug. 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 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

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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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Research Article

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

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Corresponding author:
Yan-ping Zeng E-mail: zengyanping@mater.ustb.edu.cn
Received: 17 January 2018; Revised: 21 March 2018; Accepted: 23 March 2018

Abstract

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.
- precipitate;
- P92 steel;
- long-term service;
- ultra supercritical unit

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