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Magnetometric determination of the percentage ratio of paramagnetic — ferromagnetic phase
https://doi.org/10.26896/1028-6861-2024-90-1-34-41
Abstract
Measuring of the magnetic characteristics of metal objects makes it possible to study the entire volume of the material simultaneously, while the commonly used metallographic and X-ray (phase) methods provide information only about a thin subsurface metal layer. The results of determining the percentage ratio of the paramagnetic — ferromagnetic phase in metallic materials by the magnetometric method are presented. An equation that relates the magnetic permeability and the parameters of the sample is derived. A relative change in the magnetic permeability, which characterizes the phase relationships, was determined by recording the oscillation frequency of the electric circuit built on the chain capacitor — inductor (measuring coil), in which the sample was placed. A two-phase structure (ferrite + austenite) was simulated by placing ferro- and non-ferromagnetic samples (Fe + Cu or Fe + X19H10T) in different proportions into the measuring coil. The relative magnetic permeability of 160Cr12MoV steel samples quenched at 1030 – 1250°C was studied. It has been revealed that a quenching temperature should not exceed 1120°C to provide a hardness value of 62 HRC. The results obtained can be used in the search for optimal heat treatment regimes, primarily for high-speed steels with a high austenite stability.
About the Authors
M. Yu. Belomyttcev
National University of Science and Technology «MISIS»
Russian Federation
Russian Federation
Michail Yu. Belomyttcev
4, str. 1, Leninsky prosp., Moscow, 119049
E. I. Kuzko
National University of Science and Technology «MISIS»
Russian Federation
Russian Federation
Evgeny I. Kuzko
4, str. 1, Leninsky prosp., Moscow, 119049
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Review
For citations:
Belomyttcev M.Yu., Kuzko E.I. Magnetometric determination of the percentage ratio of paramagnetic — ferromagnetic phase. Industrial laboratory. Diagnostics of materials. 2024;90(1):34-41. (In Russ.) https://doi.org/10.26896/1028-6861-2024-90-1-34-41
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