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The Effect of Nb and Ti on Structure and Mechanical Properties of 12Ni-25Cr-0.4C Austenitic Heat-Resistant Steel after Aging at 900 °C for 1000 h

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Abstract

Austenitic heat-resistant steels are particularly suitable for applications where service conditions comprise high temperature. The demand for better performance has motivated developments in these steels. In this work, Ti and Nb were added to austenitic heat-resistant steels, Fe-12Ni-25Cr-0.4C, wt.% simultaneously. Microstructural changes were studied via scanning electron microscopy equipped with energy dispersive spectrum (EDS), optical microscopy, and x-ray diffraction (XRD) in as-cast condition and after aging in 900 °C for 1000 h. Mechanical properties were measured using tensile tests, impact energy, and Vickers hardness. It was observed that by formation of NbC and TiC, the level of fragmentation of the chromium carbides increased, as a positive aspect for mechanical properties. XRD and EDS results show increasing the amount of Ti can inhibit G-phase transformation.

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Acknowledgments

The authors wish to thank Isfahan Casting Industries (ICI) for financial support.

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Authors and Affiliations

  1. Department of Material Engineering, Iran University of Industries and Mines, 87145-25564, Tehran, Iran

    Vahid Javaheri

  2. Department of Advanced Materials and Renewable Energy, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran

    Farzad Shahri

  3. Department of Materials Science and Engineering, Islamic Azad University Najafabad Branch, Najafabad, 85141-43131, Iran

    Mahyar Mohammadnezhad

  4. Department of Materials Science and Engineering, Iran University of Science and Technology, Tehran, Iran

    Morteza Tamizifar

  5. Research and Development Department, Isfahan Casting Industries (ICI), Isfahan, Iran

    Vahid Javaheri & Masaab Naseri

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  1. Vahid Javaheri
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  2. Farzad Shahri
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Correspondence to Vahid Javaheri.

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Javaheri, V., Shahri, F., Mohammadnezhad, M. et al. The Effect of Nb and Ti on Structure and Mechanical Properties of 12Ni-25Cr-0.4C Austenitic Heat-Resistant Steel after Aging at 900 °C for 1000 h. J. of Materi Eng and Perform 23, 3558–3566 (2014). https://doi.org/10.1007/s11665-014-1009-5

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  • DOI: https://doi.org/10.1007/s11665-014-1009-5

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