Abstract
The change in Ms and transformation path of γ→α′ transformation with austenite grain size (AGS) has been investigated by a thermodynamic model of martensitic transformation and the stacking fault energy (SFE) in SUS321 stainless steel. With increasing AGS, the Ms increases and the SFE decreases. A good linear relationship is established between the Ms and the SFE. This result suggests that the martensitic transformation path changes as the AGS decreases, and the γ→ε→α′ sequence is gradually suppressed when the AGS is smaller than 3.5 μm.
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