1. O. Bruchwald, W. Frackowiak, W. Reimche, and H. J. Maier, “Non-destructive in situ monitoring of the microstructural development in high performance steel components during heat treatment,” La Metall. Italiana, No. 11/12, 29 – 37 (2015).
2. C. Zhang, N. Bowler, and C. Lo, “Magnetic characterization of surface-hardened steel,” J. Magn. Magn. Mater., 321(23), 3878 – 3887 (2009).
3. J. Cuffee, H. Sun, and Yu. Plotnikov, “Eddy current measurement of casehardened depth of steel components,” in: 17th World Conf. on Nondestructive Testing, 25 – 28 Oct. 2008, Shanghai, China; URL https://www.ndt.net/article/wcndt2008/papers/383.pdf.
4. M. Blaow, J. Evans, and B. Shaw, “Effect of hardness and composition gradients on barkhausen emission in case hardened steel.” J. Magn. Magn. Mater., 303(1), 153 – 159 (2006).
5. S. Kobayashi, H. Takahashi, and Y. Kamada, “Evaluation of case depth induction-hardened steels: Martensitic hysteresis measurements and hardness depth profiling by differential permeability analysis,” J. Magn. Magn. Mater., 343, 112 – 118 (2013).