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Thermokinetic diagrams of supercooled-austenite decomposition are plotted for K76Ф rail steel with the addition of 0.026% and 0.092% Cr. The hardenability of the steel is determined. The temperature of Jominy samples is analyzed. The microstructure of the steel is established. The influence of the cooling rate, temperature, and chromium content on the microstructure and hardness of the steel is investigated...
The selection of coolants for rail quenching at OAO Nizhnetagil’skii Metallurgicheskii Kombinat (NTMK) is considered. Thermohardening in aqueous polymer solution or hot water has been developed and tested. Economically alloyed steel may be used for rail manufacture after thermal hardening by compressedair cooling. The microstructure of disperse plastic pearlite is formed in three-stage quenching,...
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