Nondestructive examination of decarburised layer of steels using eddy current and magnetic Barkhausen noise testing techniques

Surface Decarburization Depth Detection in Rods of 60Si2Mn Steel with Magnetic Barkhausen Noise Technique

“…Common decarburization detection methods, such as metallographic analysis or microhardness measurement, are destructive, time-consuming, and cannot be applied in online processing. Over the past ten years, the feasibility of measuring decarburization with nondestructive testing (NDT) methods has been investigated, such as eddy current (EC) [ 3 , 4 , 5 ], magnetic hysteresis curve [ 6 , 7 ], and magnetic Barkhausen noise (MBN) [ 8 , 9 , 10 ]. A ferrite layer on a ferrite-70% pearlite structure in AISI 1055 steel was determined with a normalized impedance of EC signals.…”

“…A ferrite layer on a ferrite-70% pearlite structure in AISI 1055 steel was determined with a normalized impedance of EC signals. With the increase in decarburization depth, both magnetic permeability and normalized impedance output increased [ 5 ]. A similar microstructural change had also been detected using the MBN technique [ 5 ].…”

“…With the increase in decarburization depth, both magnetic permeability and normalized impedance output increased [ 5 ]. A similar microstructural change had also been detected using the MBN technique [ 5 ]. Kahrobaee et al measured the decarburization depth of Hadfield steels with three NDT methods and found that magnetic flux leakage had a better linear relationship with decarburization depth compared with the magnetic hysteresis curve and EC method [ 7 ].…”

Detection of Decarburising Depth in Hadfield Steels Using a Multi-magnetic NDE Method

“…For instance, a high ferrite/low pearlite layer over a low ferrite/high pearlite layer in AISI 1045 has been characterised using the evaluation of relationship between EC impedance point and decarburizing depth [13]. In [14], The same microstructural change has been detected in AISI 1055 steel using MBN technique, where the position of the MBN peaks was used to estimate the thickness of the decarburised layer. In [15], a multi-frequency electromagnetic sensor was used to nondestructively evaluate a full ferrite layer on a full pearlitic microstructure in AISI 1080 steel, relating the inductance value to decarburised layer depth.…”

Application of Artificial Neural Network and Multi-magnetic NDE Methods to Determine Mechanical Properties of Plain Carbon Steels Subjected to Tempering Treatment

“…Recent investigations in this field have been focused on microstructural changes due to the various heat-treating processes. For instance, pearlite/ferrite fraction [2], prior austenite grain size [3], microstructural changes during recovery process [4], the thickness of induction [5][6][7], carburized [8], and *Corresponding Author Institutional Email: i_a_akhlaghi@sadjad.ac.ir (I. Ahadi Akhlaghi) decarburized [9][10][11] layers in mild carbon steels, retained austenite fraction [12], precipitation of alloy carbides [13] and secondary hardening occurrence [14] in tool steels as well as variations in mechanical properties of API X65 [15], powder metallurgical [16] and Hadfield [17] steels have been characterized using EC and MHL methods.…”