Mathematical modelling of the Eddy current and its application to the material examinations

Yıl 2012, Cilt: 1 Sayı: 2, 111 - 121, 27.03.2016

Murat Vural -

Öz

Eddy Current testing, especially the Preventive Multi-Frequency Testing (PMFT) method is being used on C45R steel material, under the control of specialities like microstructure and stiffness characteristics.The physical principles of eddy current is examined theorically, and the applications of the procedure are shown experimentally. Eddy currents can easily be used in determination of heat treatment differences of forging steel. As heat treatment conditions change, microstructure and stiffness differences that can occur especially on surface and locations near the surface of components cause some changes in permeability particularly, in high test frequencies. Eddy current can outshine by causing big changes in bobbin impedance.

Anahtar Kelimeler

Eddy current, preventive multi-frequency testing (PMFT), inductive reactance, impedance plane

Kaynakça

• Ucmihoto T, Takagi T, Konoplyuk S, Abe T, Huang H and Kurosawa M. Eddy current evaluation of cast iron for material characterization. Journal of Magnetism and Magnetic Materials, 2003; 258–259, 493 – 496.
• Konoplyuk S, Abe T, Uchimoto T, Takagi T, Huang H and Kurosawa M. Characterization of ductile cast iron by Eddy current method. NDT&E International, 2005; 38(8): 623 – 626.
• Kahn SH, Ali F, Khan AN and Iqbal MA. Eddy current detection of changes in stainless steel after cold reduction. Computational Materials Science, 2008; 43: 623 – 628.
• Kahn SH, Ali F, Khan AN and Iqbal MA. Pearlite determination in plain carbon steel by Eddy current method. Journal of Processing Technology, 2008; 300: 316 – 318.
• Mercier D, Lesage J, Decoopman X and Chicot D. Eddy currents and hardness testing for evaluation of steel decarburizing. NDT&E International, 2006; 39: 652 – 660.
• Maluba-Bafubiandi AF, Waanders FB and Jones C. Retained austenite phase in (26.5%Cr, 2.6%C) white cast iron studied by means of CEMS and Eddy current. Hyperfine Interactions, 2002; 139 – 140, 455 – 462.
• Rajkumar KV, Rao BPC, Sasi B, Kumar A, Jayakumar T, Raj B and Ray KK. Characterization of aging behaviour in M250 grade maraging steel using Eddy current non-destructive methodology. Material Science and Engineering, 2007; 464: 233 – 240.
• Zergoug M, Lebaili S, Boudjellal H and Benchaala A. Relation between mechanical microhardness and impedance variations in Eddy current testing. NDT&E International, 2004; 37: 65 – 72.