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Investigation on Aging σ-Phase Precipitation Kinetics and Pitting Corrosion of 22 Pct Cr Economical Duplex Stainless Steel with Mn Addition

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Abstract

The influence of Mn addition on σ-phase precipitation kinetics and pitting corrosion of Fe-22Cr-1.9Ni-2.3Mo-0.2N-xMn low nickel type duplex stainless steel was investigated by medium- and high-temperature aging treatments of 600 °C and 800 °C. The microstructure analysis showed that the fine rod-shaped and coarsening dendritelike σ-phase precipitates formed at 600 °C and 800 °C, respectively, and the precipitate growth with the higher temperature was accelerated due to the partition of Mn, but Mn is not a strong σ-phase forming element like Cr, Mo during aging treatment at these two temperatures. At an early aging time of 800 °C, more precipitated nuclei with more Mn addition promote refinement of σ precipitates in later aging time. The kinetic behavior at 600 °C and 800 °C is related to diffusion-controlled growth of σ phase, and the σ-phase nucleation and growth are enhanced with more Mn addition and higher aging temperature due to a faster Mn diffusion rate. The difference in precipitation morphology for two aging temperatures was attributed to the different nucleation modes caused by kinetics parameter n variation. Increasing the aging temperature from 600 °C to 800 °C increased the susceptibility to pitting with higher Mn addition due to faster σ-phase precipitation kinetics.

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Acknowledgments

The authors acknowledge the financial support by the Fundamental Research Funds for the National Natural Science Foundation of China (Grant Nos. 51261010 and 51461024).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, P.R. China

    Yinhui Yang & Hao Qian

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  1. Yinhui Yang
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  2. Hao Qian
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Correspondence to Yinhui Yang.

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Manuscript submitted October 22, 2017.

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Yang, Y., Qian, H. Investigation on Aging σ-Phase Precipitation Kinetics and Pitting Corrosion of 22 Pct Cr Economical Duplex Stainless Steel with Mn Addition. Metall Mater Trans A 49, 3184–3197 (2018). https://doi.org/10.1007/s11661-018-4634-z

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  • DOI: https://doi.org/10.1007/s11661-018-4634-z

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