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As a response to the comment by Luo, we here discuss and reiterate the importance of a combination of two factors for the room-temperature austenite stability in ultrafine-grained medium-Mn transformation-induced plasticity steel. The partitioning of Mn and C into austenite during intercritical annealing and the ultrafine size of the austenite islands should be satisfied simultaneously.
The factors leading to the room temperature stabilization of austenite were investigated for an ultrafine-grained 6mass% Mn transformation-induced plasticity steel. The size effect of ultrafine austenite grain and the partitioning of Mn to austenite during intercritical annealing were the two main contributions to the austenite stability. Mechanical stabilization of the austenite was not a factor...
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