A new process to fabricate ultrafine-grained low-carbon steel with high strength and high elongation

A new process to fabricate ultrafine-grained low-carbon steel was proposed. Low-carbon steel plates were intercritically quenched to obtain martensite-ferrite structure, and then warmly rolled at 700 °C. The processed samples revealed bimodal ultrafine ferritic grains and nanoscale carbide particles, and showed excellent mechanical properties.