Abstract
The microstructures and shape memory effect in FeMnSiCrNi0.02C and FeMnSiCrNi0.12C fabricated to equal channel angular pressing (ECAP) and subsequent aging were studied. The results reveal that after ECAP and subsequent aging, the optimal shape recovery ratio of FeMnSiCrNi0.12C aged after ECAP is 89.4 pct, 20 pct higher than FeMnSiCrNi0.02C. Microstructural analysis shows that many carbide precipitates in FeMnSiCrNi0.12C aged after ECAP effectively suppress grain coarsening. As a result, FeMnSiCrNi0.12C obtains a better shape memory effect than FeMnSiCrNi0.02C due to the finer grains together with second-phase hardening by carbide precipitation.
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