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Martensitic transformation from FCC (γ) to HCP (ε) is often observed in austenitic high Mn steels. For example, the ε-martensitic transformation occurs at cryogenic temperature in twinning induced plasticity steels1,2) and at room temperature in shape memory alloys.3,4) The ε-martensitic transformation produces the shape memory effect1) and high work hardening rates;5) however, it is also known to cause premature fracture resulting in tensile deformation. The fracture mode is known to be either an intergranular6,7) or quasi-cleavage2,6,7) fracture when this occurs. The premature fracture associated with the ε-martensitic transformation is reported to be caused by the interactions between ε-martensite plates and boundaries in Fe–27Mn–0– 7Si and Fe–20Mn–4Cr–0.5C–0.5Si alloys.6,7) The cracks are thought to be induced from the stress concentration arising from the interactions. However, the crack initiation sites of the premature fracture caused by ε-martensitic transformation are still unclear in ternary Fe–Mn–C austenitic steels which have recently been determined to be transformation induced plasticity (TRIP)8) and twinning induced plasticity (TWIP) steels.2,8–10) Primary ε-martensite plate,6) grain boundary,6,7) and twin boundary have been considered as possible boundaries that interact with ε-martensite for the occurrence of the premature fracture. We found that the annealing twin boundaries were the crack initiation sites in the Fe–17Mn–0.3C steel in this study and will provide the evidences.

Quasi-cleavage Fracture along Annealing Twin Boundaries in a Fe–Mn–C Austenitic Steel