Quantification of Isothermal Phase Transformation in Solid Metals Based on Measurement of Magnetic Susceptibility

摘要

A new method that provides quantitative information of phase transformation in solid metals by measuring a magnetic susceptibility has been proposed. The principle of the method is based on that the magnetic susceptibility is different from one phase to another and additive identity holds in the magnetic susceptibilities. This method directly reflects the phase transformation and provides more accurate information in comparison with conventional methods, which are based on indirect measurements of various physical properties or micro-structure observation. This method not only enables continuous measurement of phase transformation, but also can clearly indicate the start and end points of it. In this study, this new method was applied to measure the α/γ isothermal transformation rate in an Fe-C alloy above the Curie temperature.