| The surface hardness of20CrMnTi can be improved by carburizing treatment, while thegood plasticity in the core of alloy can be maintained at the same time. The carburizing specimenmust be heattreated, which can perform the function of the carburizing layer and increase thehardness, wear resistance and fatigue strength of the specimen. In order to improve themechanical properties of the carburizing20CrMnTi. The microstructure and mechanicalproperties of carburizing20CrMnTi were studied after secondary hardening and cryogenicprocessing treatment, respectively. The microstructure, the hardness and torsional strength of thetreated specimen were studied. The experimental results show that: the optimum torsionalstrength was obtained that the first quenching temperature is860℃, secondary quenchingtemperature is860℃, tempering temperature is220℃Tempering time is4h,. After carburizing,quenching, tempering and cryogenic treatment, cryogenic treatment improves the hardness andtorsional strength, torsional strength maximum optimum heat treatment: quenching temperatureis860℃, tempering temperature is200℃, cryogenic for20h. Secondary quenching andcryogenic treatment process to improve the torsional strength is more than40%. |
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