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EFFECT OF PRECURSOR MICROSTRUCTURE ON MORPHOLOGY FEATURE AND MECHANICAL PROPERTY OF C–Mn–Si STEEL

The eﬀects of diﬀerent precursor microstructure on the morphology and mechanical properties of the 0.22C–1.9Mn–1.32Si multiphase steel which was obtained by the treatment of intercritical reheating–quenching and partitioning (IQ&P) heat treatment were examined. Under the same IQ&P heat treatment parameters, multiphase microstructure which contains lath–like multiphase steel which has a M precursor, retained austenite in this kind of steel is relatively stable, variation behavior curve of the instantaneous n value with true strain for this kind of steel is much more steady, which shows a trend of gradual increasing. The reason for the diﬀerent tensile testing and work hardening results above is related to the morphology, proportion and distribution state of the retained austenite and matrix microstructures, which is due to the eﬀect of diﬀerent morphology and microstructure characteristics of the precursor phases by the roots.