Microstructures and mechanical properties of surface and center of carburizing 23Cr2Ni2Si1Mo steel subjected to low-temperature austempering

A multiphase microstructure composed of nano-scaled bainite, martensite, undissolved spherical carbides and retained austenite was obtained on the top surface of carburizing 23Cr2Ni2Si1Mo steel after low-temperature austempered at 200 °C, with a dual-phase microstructure of fine martensite lath and carbon-enriched retained austenite in the center of steel. As compared with the conventional oil quenching and tempering (OQ) state, the...