Evaluation of rail decarburisation depth using a H-shaped electromagnetic sensor

Abstract This paper reports the evaluation of rail decarburisation based on eddy current methods using an H-shaped sensor. Rails with different levels of decarburisation, due to different bloom reheat times (195 min–613 min), were used. Experimental results have indicated that the measured inductance of the sensor is closely related to the reheat furnace dwell time of the rail samples. Quantification of the amount of decarburisation, using micro-hardness tests and visual evaluation, and the predicted amount (based on Fick's law), have been compared with the eddy current approach, with reasonable agreement being seen.

[1]  Xiaodong Li,et al.  Mössbauer study of the 430 °C decomposition of 18Ni(350) maraging steel , 1996 .

[2]  Wuliang Yin,et al.  Off-line measurement of decarburization of steels using a multifrequency electromagnetic sensor , 2008 .

[3]  Wuliang Yin,et al.  Modelling and experimental study of an electromagnetic sensor with an H-shaped ferrite core used for monitoring the hot transformation of steel in an industrial environment , 2011 .

[4]  Richard Binns,et al.  The Development of a Multifrequency Electromagnetic Instrument for Monitoring the Phase Transformation of Hot Strip Steel , 2007, IEEE Transactions on Instrumentation and Measurement.

[5]  W Yin,et al.  Measurement of decarburisation of steel rods with an electromagnetic sensor using an analytical model , 2009, 2009 IEEE Instrumentation and Measurement Technology Conference.

[6]  Erol Uzal,et al.  Thickness and conductivity of metallic layers from eddy current measurements , 1992 .

[7]  Wuliang Yin,et al.  Characterization of Decarburization of Steels Using a Multifrequency Electromagnetic Sensor: Experiment and Modeling , 2009 .

[8]  Brian A. Shaw,et al.  Surface decarburisation of steel detected by magnetic barkhausen emission , 2005 .

[9]  O. Bouaziz,et al.  Physical modelling of microstructure and mechanical properties of dual-phase steel , 2001 .

[10]  H. K. D. H. Bhadeshia,et al.  Diffusion of carbon in substitutionally alloyed austenite , 1995 .

[11]  A. J. Peyton,et al.  Imaging the transformation of hot strip steel using magnetic techniques , 2001, J. Electronic Imaging.

[12]  Pascal Jacques,et al.  On the influence of aluminium content on the stability of retained austenite in multiphase TRIP-assisted steels , 2001 .

[13]  R. G. Baggerly,et al.  Determination of decarburization in steel , 1993 .

[14]  Gary G. Tibbetts,et al.  Diffusivity of carbon in iron and steels at high temperatures , 1980 .

[15]  John H. Beynon,et al.  Decarburisation and rolling contact fatigue of a rail steel , 2006 .

[16]  M. Gildersleeve,et al.  Relationship between decarburisation and fatigue strength of through hardened and carburising steels , 1991 .

[17]  R. P. Smith.  The diffusivity of carbon in iron by the steadystate method , 1953 .

[18]  K. H. Finken,et al.  Measurement of helium gas in a deuterium environment , 1992 .

[19]  Didier Chicot,et al.  Eddy currents and hardness testing for evaluation of steel decarburizing , 2006 .

[20]  A. Peyton,et al.  Imaging the continuous conductivity profile within layered metal structures using inductance spectroscopy , 2005, IEEE Sensors Journal.

[21]  Toshiyuki Takagi,et al.  Characterization of ductile cast iron by eddy current method , 2005 .

[22]  B. A. Auld,et al.  Eddy-Current Reflection Probes: Theory and Experiment , 1989 .

[23]  Toshiyuki Takagi,et al.  Eddy current evaluation of cast irons for material characterization , 2003 .