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Coarsening behavior of MX carbonitrides in type 347H heat-resistant austenitic steel during thermal aging

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Abstract

In this work, the growth kinetics of MX (M = metal, X = C/N) nanoprecipitates in type 347H austenitic steel was systematically studied. To investigate the coarsening behavior and the growth mechanism of MX carbonitrides during long-term aging, experiments were performed at 700, 800, 850, and 900°C for different periods (1, 24, 70, and 100 h). The precipitation behavior of carbonitrides in specimens subjected to various aging conditions was explored using carbon replicas and transmission electron microscopy (TEM) observations. The corresponding sizes of MX carbonitrides were measured. The results demonstrates that MX carbonitrides precipitate in type 347H austenitic steel as Nb(C,N). The coarsening rate constant is time-independent; however, an increase in aging temperature results in an increase in coarsening rate of Nb(C,N). The coarsening process was analyzed according to the calculated diffusion activation energy of Nb(C,N). When the aging temperature was 800–900°C, the mean activation energy was 294 kJ·mol−1, and the coarsening behavior was controlled primarily by the diffusion of Nb atoms.

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Authors and Affiliations

  1. State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China

    Ying-hui Zhou, Chen-xi Liu, Yong-chang Liu, Qian-ying Guo & Hui-jun Li

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  1. Ying-hui Zhou
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  2. Chen-xi Liu
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  3. Yong-chang Liu
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Correspondence to Yong-chang Liu.

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Zhou, Yh., Liu, Cx., Liu, Yc. et al. Coarsening behavior of MX carbonitrides in type 347H heat-resistant austenitic steel during thermal aging. Int J Miner Metall Mater 23, 283–293 (2016). https://doi.org/10.1007/s12613-016-1237-9

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  • DOI: https://doi.org/10.1007/s12613-016-1237-9

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