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Martensite transformations of supercooled austenite quenched at 860 °C. (a) 369.2 °C, martensite appeared; (b) 274.6 °C, martensite increased; (c) 267.5 °C, martensite nucleated and grew at the twins; (d) 264.9 °C, SM and surface relief; (e) 260.5 °C, martensitic lath collisions; (f) 102.2 °C, martensitic transformation stopped and residual austenite formed.
