Abstract
Low-alloy Cr‐Mo‐V structural steel is widely used because its mechanical properties may be enhanced by varying the parameters of strengthening heat treatment [1]. Selection of the optimal treatment temperature and time calls for study of austenite-grain growth on heating and the disintegration kinetics of the supercooled austenite. In addition, account must be taken of the influence of the decomposition products of austenite, by various mechanisms, on the steel properties. In the present work, we study the structural and phase transformations in low-alloy Cr‐Mo‐V steels on heating in the austenite region and on continuous cooling at different rates. The table summarizes the chemical composition of the steel. SNOL furnaces are used for heat treatment of steel. A Neophot 21 optical microscope permits metallographic analysis. Durometric data are obtained in accordance with State Standard GOST 2999; a MK30A pendulum-type impact tester is employed for dynamic tests. Fractographic data are obtained by means of a Philips SEM 535 raster electron microscope. The disintegration kinetics of the supercooled austenite in continuous cooling is studied by means of a programmable electronic‐mechanical dilatometer, which permits sample heating at 0.5‐1000 ° C/min and cooling at 0.5‐500 ° C/min.
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