Abstract
We investigated the effect of cooling rate on the grain growth of δ-ferrite and γ-austenite in an Fe-18.80Mn-6.15Si-8.89Cr-4.81Ni shape memory alloy underwent δ→γ phase transformation. The anomalous grain growth of δ-ferrite occurred prior to the δ→γ phase transformation. Additionally, the δ→γ phase transformation introduced abundant sub-grains within γ-austenite. The abnormal grain growth of γ-austenite occurred after the δ→γ phase transformation because theses sub-grains provided the driving force of grain boundary migration. Furthermore, a slower cooling rate before and after the δ→γ phase transformation resulted in achieving bigger grains for both δ-ferrite and γ-austenite. By utilizing the δ→γ phase transformation, the austenitic grains of above ∼600 μm, even at a millimeter-level, were obtained. Finally, we achieved a recovery strain of above ∼ 6%, breaking through the recovery strain ceiling of 6% in processed Fe-Mn-Si-based shape memory alloys.
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