Evaluation of Electromagnetic Inspection of Hardened Depth of Spheroidal Graphite Cast Iron Using 3-D Nonlinear FEM

• Published in: IEEE transactions on magnetics 2010-08, Vol.46 (8), p.3137-3144
• Main Authors: Gotoh, Yuji, Sasaguri, Nobuya, Takahashi, Norio
• Format: Article
• Language: English
• Subjects: 3-D nonlinear finite element method; Applied sciences; Cast iron; Conductivity; Cross-disciplinary physics: materials science; rheology; Electromagnetic measurements; Electromagnetic properties; Exact sciences and technology; Ferrites; Finite element method; Hardened depth; Hardening. Tempering; Heat treatment; Inspection; interpolation of the electromagnetic property; Magnetic field measurement; Magnetism; Materials science; Materials science and technology; Mathematical models; Metals. Metallurgy; Nodular graphitic structure; Nonlinearity; Optical microscopy; Optical surface waves; Other topics in materials science; Physics; Power engineering and energy; Production techniques; Surface hardening; surface hardening spheroidal graphite cast iron
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2010.2043232

The inspection of the hardened depth of surface hardening spheroidal graphite cast iron is important in the maintenance of various mechanical parts, etc. There is a difference of the electromagnetic property in the layers with and without hardening. Therefore, the evaluation of the hardened depth is possible by detecting the difference of the electromagnetic characteristic. In this paper, the electromagnetic method for measuring the depth of a hardened layer using an alternating magnetic field is proposed. The flux density in the surface hardening spheroidal graphite cast iron is estimated by 3-D nonlinear FEM taking account of the electromagnetic property of the layers with and without hardening. In addition, the experimental verification is also carried out.