HIGH STRENGTH-HIGH DUCTILITY CARBON STEEL, AND METHOD FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a carbon steel in which high strength and high ductility are balanced. SOLUTION: Each powder of pure iron and carbon or the powder of a carbon steel is subjected to mechanical milling treatment. The obtained powder is subjected to discharge plasma sintering, so as to be a steel having a structure in which the average crystal grain size of a mother phase is <1μm, and cementite grains with a size of≤100 nm are uniformly dispersed, exhibiting a yield strength of≥1,500 MPa and a true strain of≥0.2, and also exhibiting work hardening. COPYRIGHT: (C)2007,JPO&INPIT