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Improved Creep Behavior of a High Nitrogen Nb-Stabilized 15Cr-15Ni Austenitic Stainless Steel Strengthened by Multiple Nanoprecipitates

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Abstract

Austenitic stainless steels are expected to be a major material for boiler tubes and steam turbines in future ultra-supercritical (USC) fossil power plants. It is of great interest to maximize the creep strength of the materials without increasing the cost. Precipitation strengthening was found to be the best and cheapest way for increasing the creep strength of such steels. This study is concerned with improving creep properties of a high nitrogen Nb-stabilized 15Cr-15Ni austenitic alloy through introducing a high number of nanosized particles into the austenitic matrix. The addition of around 4 wt pct Mn and 0.236 wt pct N into the 15Cr-15Ni-0.46Si-0.7Nb-1.25Mo-3Cu-Al-B-C matrix in combination with a special multicycled aging-quenching heat treatment resulted in the fine dispersion of abundant quantities of thermally stable (Nb,Cr,Fe)(C,N) precipitates with sizes of 10 to 20 nm. Apart from the carbonitrides, it was found that a high number of coherent copper precipitates with size 40 to 60 nm exist in the microstructure. Results of creep tests at 973 K and 1023 K (700 °C and 750 °C) showed that the creep properties of the investigated steel are superior compared to that of the commercial NF709 alloy. The improved creep properties are attributed to the improved morphology and thermal stability of the carbonitrides as well as to the presence of the coherent copper precipitates inside the austenitic matrix.

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Acknowledgments

This research was supported by the Fundamental R&D Program of the Korea Institute of Science and Technology (KIST). The authors also express gratitude to the Materials/Devices Division of KIST as well as to the University of Science and Technology for providing facilities and a favorable environment to carry out this study.

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Authors and Affiliations

  1. Materials Research Division, Korea Institute of Science and Technology, Cheongryang, Seoul, 130-650, Republic of Korea

    Vu The Ha (Doctoral Student), Woo Sang Jung (Professor and Senior Researcher) & Jin Yoo Suh (Senior Researcher)

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  1. Vu The Ha
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  2. Woo Sang Jung
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  3. Jin Yoo Suh
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Correspondence to Vu The Ha.

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Manuscript submitted February 3, 2011.

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Ha, V.T., Jung, W.S. & Suh, J.Y. Improved Creep Behavior of a High Nitrogen Nb-Stabilized 15Cr-15Ni Austenitic Stainless Steel Strengthened by Multiple Nanoprecipitates. Metall Mater Trans A 42, 3378–3385 (2011). https://doi.org/10.1007/s11661-011-0752-6

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