C. J. Hellier, Handbook of nondestructive evaluation, 2003.

, Sensors, vol.11, pp.2525-2565, 2011.

M. K. Devine, JOM, vol.44, pp.24-30, 1992.

O. Saquet, J. Chicois, and A. Vincent, ICMMME 2020 IOP Conf. Series: Materials Science and Engineering, vol.269, p.12005, 1999.

C. Davis, M. Strangwood, and A. Peyton, Ironmaking Steelmaking, vol.38, pp.510-517, 2011.

D. Mercier, J. Lesage, X. Decoopman, D. Chicot, and N. Int, , vol.39, pp.652-660, 2006.

M. S. Amiri, M. Kashefi, and N. Int, , vol.42, pp.618-621, 2009.

F. Rumiche, J. E. Indacochea, and M. L. Wang, JMEP, vol.17, pp.586-593, 2008.

S. Konoplyuk and N. Int, , vol.43, pp.360-364, 2010.

S. Ghanei, M. Kashefi, and M. Mazinani, Mater. Des, vol.50, pp.491-496, 2013.

L. Zhou, J. Liu, X. J. Hao, M. Strangwood, A. J. Peyton et al., NDT&E INT, vol.67, pp.31-35, 2014.

W. Ricken, H. C. Schoenekess, and W. J. Becker, Sens. Actuator A-Phys, vol.129, pp.80-85, 2006.

B. Cao and T. Iwamoto, Steel Res. Int, vol.87, pp.1-10, 2017.

L. B. Bramfitt and O. A. Benscoter, Metallographer's guide: Practices and procedures for irons and steels, 2002.

, ASTM E112-13 Standard test methods for determining average grain size, 2013.

G. F. Vander, A. Voort, and M. Róosz, , vol.17, pp.1-17, 1984.

L. Clapham, C. Jagadish, and D. L. Atherton, Acta Metall. Mater, vol.39, pp.1555-1562, 1991.

S. M. Thompson and B. K. Tanner, J. Magn. Magn. Mater, vol.123, pp.283-298, 1993.

J. W. Byeon and S. I. Kwun, Mater. Trans, vol.44, pp.2184-2190, 2003.