Preparation of nanostructured bainite in medium-carbon alloysteel

Nanostructured bainite was prepared in medium-carbon Si–Al-rich alloy steel by low-temperature austempering of deformation-strengthened supercooled austenite. The deformation strengthening of supercooled austenite can depress the martensite start temperature, allowing austempering at a lower temperature to form nanostructured bainite with high hardness.