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Magnetic Nondestructive Evaluation of Creep Behavior in Water-Quenched Modified 9Cr-1Mo Steel

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Abstract

Water-quenched modified 9Cr-1Mo steel was creep tested in the laboratory at a temperature of 600 °C and 125 MPa stress. Magnetic Barkhausen emissions (MBE) measurements were carried out by interrupting the test at different lengths of time. Creep damage in such steel was observed by an increase in root mean square (RMS) voltage of the MBE. The magnetic softening was corroborated with the decrease in pinning density in the material for the coarsening of carbides (M23C6) and formation of massive phases (Fe2Mo), which comes at the expense of a large number of finer carbides. Before failure, the rate of increase in RMS voltage of the MBE decreased due to the demagnetizing field offered by the massive phases. The microstructural analysis was carried out using scanning electron microscopy (SEM) and transmission electron microscopy (TEM) study.

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Acknowledgments

The authors are grateful to the Director, NML, for his permission to carry out the work and for publishing the article. One of the authors (JNM) acknowledges CSIR for providing the financial support for his research work.

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Authors and Affiliations

  1. National Metallurgical Laboratory, Council of Scientific and Industrial Research, Jamshedpur, 831007, India

    J.N. Mohapatra (Senior Research Fellow), J. Swaminathan (Scientist), M.K. Ghosh (Scientist) & A. Mitra (Deputy Director (Scientist F)

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  1. J.N. Mohapatra
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  2. J. Swaminathan
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  3. M.K. Ghosh
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  4. A. Mitra
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Correspondence to A. Mitra.

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Manuscript submitted November 14, 2008.

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Mohapatra, J., Swaminathan, J., Ghosh, M. et al. Magnetic Nondestructive Evaluation of Creep Behavior in Water-Quenched Modified 9Cr-1Mo Steel. Metall Mater Trans A 41, 900–905 (2010). https://doi.org/10.1007/s11661-009-0137-2

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