Work Hardening Mechanism in Soft Particle Dispersion Ferritic Steel

摘要

Steels containing a second phase, such as particle dispersion steel and dual phase steel, exhibit a large work-hardening behavior depending on the dispersion condition of second phase. According to Ashby(1,2), the enhanced work-hardening rate of these steels is explained by the accumulation of GN dislocations restoring displacement at interface between matrix and second phase, and the increase in flow stress (Δσt) is quantified by eq. [1] as functions of true strain (εt), volume fraction (f) and size (d) of second phase.