Title: Quantitative NDT structuroscopy of cast iron castings for vehicles

Authors: Bretislav Skrbek; Ivan Tomas

Addresses: Department of Material Science, Faculty of Mechanical Engineering, Technical University of Liberec, Studentská 2, CZ 46117 Liberec 11, Czech Republic. ' Department of Magnetism, Institute of Physics, Czechoslovak Academy of Sciences, Prague, Na Slovance 2, CZ 182 21 Praha 8, Czech Republic

Abstract: Cast irons look like |composites| made of a steel matrix and graphite filler. The standard description of matrix and graphite structure properties, e.g., after EN 945 is not satisfactory. Physical description of its structure can be better carried out using rigidity and hardness of matrix. The expression of this description in a plane using bidimensional vector of tension strength or yield strength offers new useful relations to manufacturing metallurgy. Mathematical models among physical and mechanical properties were derived by statistical analysis. The MAT method is developed for thin-wall castings. Magnetic adaptive testing (MAT) is shortly said magnetic hysteresis NDT method exploiting large datafile created by voltage impulse induced in detection coil winded onto specimen, in dependence on immediate value of magnetic field of specimen. It is combined with another way of testing by a device for remanent magnetism measurement and an ultrasound impulse device with probes placed onto surface of the measured object, together with wall-thickness tester for thick-wall castings.

Keywords: magnetic adaptive testing; structuroscopy; cast iron; clutch disks; NDT; nondestructive testing; mathematical modelling; tension strength; yield strength; metallurgy; thick-wall castings.

DOI: 10.1504/IJMMP.2011.043224

International Journal of Microstructure and Materials Properties, 2011 Vol.6 No.3/4, pp.293 - 306

Published online: 20 Oct 2011 *

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