Abstract
A new Fe-0.2C-1.77Mn-1.27Cr automotive steel with a total alloying content less than 3.5 mass% and a fraction of retained austenite only about 4%, exhibits improved combination of high strength over 1000 MPa and excellent elongation larger than 20%. The findings are discussed in relation to grain refinement and multi-phase microstructure control. The existence of polygonal ferrites contributes to the enhancement of mechanical properties due to their fine grain size and high dislocation density. Furthermore, the dislocation pinned by the particles has been used as a “potential” Frank-Read source to compensate for the absence of a movable dislocation source. It is concluded that the high combination of high strength and excellent elongation could be obtained by multi structural control instead of sole retained austenite.
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