AUSTENITE GRAIN STABILITY OF LOW-MANGANESE, HIGH-CHROMIUM CARBURIZING STEEL

摘要

Since parts for the automotive drive train require lower cost as well as smaller size and lighter weight for improvement in fuel consumption, carburizing steel for those parts is expected to have low cost, high cold formability and machinability and high strength. We found that the steel with lower manganese and higher chromium than conventional carburizing steel meets these needs. It was also confirmed that this steel showed higher criterion in austenite grain coarsening temperature during carburizing than conventional steel. In the present study, the improvement mechanism of austenite grain coarsening temperature of this steel was discussed.