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Influence of precipitates on the magnetic properties of Fe–Cr–Mo alloys studied by X-ray diffraction, Mössbauer spectroscopy and vibrating sample magnetometry

  • Kleyton J. Camelo (a1), Francisco C. Oliveira Junior (a1), Manoel R. da Silva (a2) and Igor F. Vasconcelos (a1)


X-ray diffraction (XRD), transmission Mössbauer spectroscopy, and vibrating sample magnetometry were used to study the influence of precipitates on the magnetic properties of aged Fe–Cr–Mo alloys. XRD patterns and Mössbauer spectra showed that the alloys have body-centered cubic structure similar to that of α-Fe. Small amounts of precipitates were also identified with relative fraction found to be related to Mo content, aging times, and temperatures. Magnetic measurements showed that the increase in the density of precipitates contributes significantly to the increase in the magnetic hardness of the material. This mechanism is related to a process of pinning of magnetic domain walls. It was also found that saturation magnetization is affected by the Mo content in the alloy. The techniques used in this work were shown to be very useful to understand the mechanisms through which the formation of precipitates affects the magnetic properties of the alloys and may be used as complement to the usual microscopy-based techniques for this purpose.


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1. Greeff, A.P., Louw, C.W., and Swart, H.C.: The oxidation of industrial FeCrMo steel. Corros. Sci. 42(10), 1725 (2000).
2. Klueh, R.L.: Chromium-molybdenum steels for fusion reactor first walls—A review. Nucl. Eng. Des. 72(3), 329 (1982).
3. Jayan, V., Khan, M.Y., and Husain, M.: Coarsening of nanosized carbide particles in 2.25Cr–1Mo power plant steel after extended service. Mater. Lett. 58(21), 2569 (2004).
4. Mohapatra, J.N., Panda, A.K., and Mitra, A.: Magnetic properties evaluation of ageing behaviour in water-quenched 5Cr–0.5Mo steel. J. Phys. D: Appl. Phys. 42(9), 095006 (2009).
5. ElMassalami, M., de Sousa, I.P., Areiza, M.C.L., Rabello, J.M.A., and Elzubair, A.: On the magnetic anisotropy of superduplex stainless steel. J. Magn. Magn. Mater. 323(18–19), 2403 (2011).
6. Kim, M.J., Park, S.H., and Lee, D.B.: Corrosion of Fe–2.25% Cr–1% Mo steels at 600 °C–800 °C in N2/H2O/H2S atmospheres. Energy Procedia 14, 1837 (2012).
7. Wu, X.Q., Jing, H.M., Zheng, Y.G., Yao, Z.M., and Ke, W.: Resistance of Mo-bearing stainless steels and Mo-bearing stainless-steel coating to naphthenic acid corrosion and erosion-corrosion. Corros. Sci. 46(4), 1013 (2004).
8. Kuzmann, E., Bene, E., Domonkos, L., Hegedus, Z., Nagy, S., and Vertes, A.: Structure investigation and phase analysis of Fe–Cr carbides. J. Phys. 37(23), 409 (1976).
9. Vardavoulias, M. and Papadimitrou, G.: Mössbauer spectra and hyperfine parameters of iron–chromium carbides in ferritic stainless steel. Phys. Status Solidi A 134(1), 183 (1992).
10. Schaaf, P., Kramer, A., Wiesen, S., and Gonser, U.: Mössbauer study of iron carbides: Mixed carbides M7C3 and M23C6 . Acta Metall. Mater. 42(9), 3077 (1994).
11. Cieślak, J., Reissner, M., Steiner, W., and Dubiel, S.M.: On the magnetism of the σ-phase FeCr alloys. Phys. Status Solidi A 205(8), 1794 (2008).
12. Cieślak, J., Dubiel, S.M., and Reissner, M.: Magnetism of σ-phase FeMo alloys: Its characterization by magnetometry and Mössbauer spectrometry. J. Magn. Magn. Mater. 401(1), 751 (2016).
13. Cieślak, J., Przewoznik, J., and Dubiel, S.M.: Structural and electronic properties of the μ-phase FeMo compounds. J. Alloys Compd. 612(5), 465 (2014).
14. Kimball, C.W., Phillips, W.C., Nevitt, M.V., and Preston, R.S.: Magnetic hyperfine interactions and electric quadrupolar coupling in alloys of iron with the alpha-manganese structure. Phys. Rev. 146(2), 375 (1966).
15. Byeon, J.W. and Kwun, S.I.: Magnetic nondestructive evaluation of thermally degraded 2.25Cr–1Mo steel. Mater. Lett. 58(1–2), 94 (2003).
16. Moorthy, V., Vaidyanathan, S., Raj, B., Jayakumar, T., and Kashyap, B.P.: Insight into the microstructural characterization of ferritic steels using micromagnetic parameters. Metall. Mater. Trans. A 31(4), 1053 (2000).
17. Mohapatra, J., Panda, A.K., Gunjan, M., Bandyopadhyay, N.R., Mitra, A., and Ghosh, R.N.: Ageing behavior study of 5Cr–0.5Mo steel by magnetic Barkhausen emissions and magnetic hysteresis loop techniques. NDT&E Int. 40(2), 173 (2007).
18. Gomes da Silva, M.J., Herculano, L.F.G., Urcezino, A.S.Z., Araújo, W.S., de Abreu, H.F.G., and de Lima Neto, P.: Influence of Mo content on the phase evolution and corrosion behavior of model Fe9Cr x Mo (x = 5, 7, and 9 wt%) alloys. J. Mater. Res. 30(12), 1999 (2015).
19. Marcus, H.L. and Schwartz, L.H.: Mössbauer spectra of FeMo alloys. Phys. Rev. 162(2), 259 (1967).
20. Vasconcelos, I.F., Tavares, S.S.M., Reis, F.E.U., and Abreu, H.F.G.: Ageing effects on α’ precipitation and resistance to corrosion of a novel Cr–Mo stainless steel with high Mo content. J. Mater. Sci. 44(1), 293 (2009).
21. Jiles, D.C. and Atherton, D.L.: Theory of ferromagnetic hysteresis. J. Magn. Magn. Mater. 61(1–2), 48 (1986).
22. Jiles, D.C. and Atherton, D.L.: Theory of the magnetisation process in ferromagnetism and its application to the magnetomechanical effect. J. Phys. D: Appl. Phys. 17(6), 1265 (1984).
23. Bertotti, G.: Hysteresis in Magnetism: For Physicists, Materials Scientists, and Engineers (Academic Press, San Diego, California, EUA, 1998).


Influence of precipitates on the magnetic properties of Fe–Cr–Mo alloys studied by X-ray diffraction, Mössbauer spectroscopy and vibrating sample magnetometry

  • Kleyton J. Camelo (a1), Francisco C. Oliveira Junior (a1), Manoel R. da Silva (a2) and Igor F. Vasconcelos (a1)


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